linux dhclient配置（dhclient配置文件）

大家好，我是讯享网，很高兴认识大家。

 <p style="text-indent:2em;"> 1.网卡配置文件</p>

讯享网

讯享网  </td> <td style="border-style:none;"> [root@<u>te</u>stcentos7 ~]# cat /etc/sysconfig/netw<u>or</u>k-scripts/ifcfg-ens33</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> TYPE="<u>Ethernet</u>"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> PROXY_METHOD="none"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> BROWSER_ONLY="no"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> BOOTPROTO="none"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> DEFROUTE="yes"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV4_FAILURE_FATAL="no"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6INIT="yes"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_AUTOCONF="yes"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_DEFROUTE="yes"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_FAILURE_FATAL="no"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_<u>AD</u>DR_GEN_MODE="stable-priv<u>ac</u>y"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> NAME="ens33"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> UUID="4cf09cae-5418-44e9-8450-bd68fc"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> DEVICE="ens33"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> ONBOOT="yes"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPADDR="192.168.52.130"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> PREFIX="24"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> GATEWAY="192.168.52.2"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> DNS1="119.29.29.29"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> 解释每个字段的含义：</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> TYPE="Ethernet"：指定<u>网络</u><u>接口</u>类型为<u>以太网</u>。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> PROXY_METHOD="none"：不使用代理方法。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> BROWSER_ONLY="no"：不仅限于浏览器。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> BOOTPROTO="none"：手动配置 IP 地址，不使用 DHCP。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> DEFROUTE="yes"：将此接口设置为默认路由。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV4_FAILURE_FATAL="no"：IPv4 连接失败不会导致系统失败。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6INIT="yes"：启用 IPv6。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_AUTOCONF="yes"：启用 IPv6 自动配置。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_DEFROUTE="yes"：将此接口设置为 IPv6 默认路由。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_FAILURE_FATAL="no"：IPv6 连接失败不会导致系统失败。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPV6_ADDR_GEN_MODE="stable-privacy"：使用稳定的隐私地址生成模式。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> NAME="ens33"：接口名称为 ens33。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> UUID="4cf09cae-5418-44e9-8450-bd68fc"：接口的唯一标识符。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> DEVICE="ens33"：接口设备名称为 ens33。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> ONBOOT="yes"：在系统引导时自动启用该接口。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> IPADDR="192.168.52.130"：指定 IPv4 地址为 192.168.52.130。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> PREFIX="24"：IPv4 子网掩码前缀为 24，即 255.255.255.0。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> GATEWAY="192.168.52.2"：指定默认网关为 192.168.52.2。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> DNS1="119.29.29.29"：指定首选 DNS 服务器为 119.29.29.29。</td> </tr></tbody></div><p style="text-indent:2em;"> 2https://www.elecfans.com/emb/etc/hosts</p>

系统文件，用于配置主机名与 IP 地址的映射关系。当系统需要解析主机名时，会首先查找 /etc/hosts 文件，如果在该文件中找到了相应的映射关系，则直接使用对应的 IP 地址进行<u>通信</u>，而不需要进行 DNS 查询。</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# cat /etc/hosts</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> 127.0.0.1 localhost localhost.loca<u>ldo</u>main localhost4 localhost4.localdomain4</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> 127.0.0.1 localhost：将 localhost 主机名映射到回环地址 127.0.0.1，即本地主机。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> ::1 localhost：将 IPv6 的 localhost 主机名映射到回环地址 ::1，即本地主机。</td> </tr></tbody></div><p style="text-indent:2em;"> 3https://www.elecfans.com/emb/etc/hostname</p>

主机名称配置文件</p>

讯享网3.1.修改主机名称的三种方法</p>

1.重启后生效</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# vim /etc/hostname</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> hehe</td> </tr></tbody></div><p style="text-indent:2em;"> 2.临时修改</p>

  </td> <td style="border-style:none;"> 临时修改主机名称 重启系统失效 退出重新连接即可生效</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> [root@hehe ~]# hostname web</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> [root@hehe ~]# exit</td> </tr></tbody></div><p style="text-indent:2em;"> 3.临时加永久修改主机名称</p>

讯享网

讯享网  </td> <td style="border-style:none;"> 临时+永久 同时修改了配置文件 重启会读取主机名的配置文件 重点</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> [root@web ~]# hostnamectl set-hostname nihaoshuai</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> [root@web ~]# cat /etc/hostname</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> nihaoshuai</td> </tr></tbody></div><p style="text-indent:2em;"> 4https://www.elecfans.com/emb/etc/resolv.conf</p>

用于 DNS 解析的配置<u>信息</u>。DNS 解析是将主机名转换为 IP 地址的过程，在 <u>Linux</u> 中，通常使用 resolver 库提供的函数来进行 DNS 解析。该文件由网络管理程序根据网络配置自动生成，但也可以手动编辑此文件以更改 DNS 解析配置。</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# cat /etc/resolv.conf</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # Generated by NetworkManager</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> nameserver 119.29.29.29</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> search localdomain</td> </tr></tbody></div><p style="text-indent:2em;"> <strong>注意事项</strong> 1.如果网卡配置了DNS,resolv.conf会被覆盖 2.网卡配置DNS必须重启才能生效 3.如果网卡没有配置DNS不影响resolv.conf 4.resolv.conf配置DNS直接生效不需要重启 建议在resolv.conf配置不在网卡配置</p>

[root@testcentos7 ~]# cat /etc/resolv.conf Generated by NetworkManager nameserver 223.5.5.5 nameserver 114.114.114.114 nameserver 8.8.8.8</p>

讯享网5.安装查询IP</p>

 </p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# yum -y install bind-u<u>ti</u>ls</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> [root@testcentos7 ~]# nslookup www.b<u>ai</u>du.com</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Server:119.29.29.29</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Address:119.29.29.29#53</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Non-authoritative answer:</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> www.baidu.com<u>can</u>on<u>ic</u>al name = www.a.shifen.com.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Name:www.a.shifen.com</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Address: 220.181.38.150</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Name:www.a.shifen.com</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Address: 220.181.38.149</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Name:www.a.shifen.com</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Address: 240e:83:205:5a:0b05f:346b</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Name:www.a.shifen.com</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Address: 240e:83:205:58:0b09f:36bf</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr></tbody></div><p style="text-indent:2em;"> 6https://www.elecfans.com/emb/etc/fstab</p>

系统文件，用于配置在系统启动时自动挂载的文件系统。它定义了文件系统的挂载点、设备、文件系统类型、挂载选项等信息。</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# cat /etc/fstab</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> #</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # /etc/fstab</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # Created by anaconda on Wed Jan 10 1704 2024</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> #</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # Accessible filesystems, by reference, are maintained under '/dev/disk'</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> #</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> /dev/mapper/centos-root / xfs defaults 0 0</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> UUID=dbee441f-<u>bdc</u>d-41db-824c-3f461eb48952 /boot xfs defaults 0 0</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> /dev/mapper/centos-swap swap swap defaults 0 0</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> /dev/mapper/centos-root：指定要挂载的设备或文件系统。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> /：指定文件系统的挂载点，即根目录。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> xfs：指定文件系统的类型。</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> defaults：指定挂载选项，表示使用</td> </tr></tbody></div><p style="text-indent:2em;"> 7https://www.elecfans.com/emb/etc/rc.local</p>

在早期版本的 Linux 中，/etc/rc.local 是一个可执行脚本文件，用于在系统引导过程中作为最后一个启动脚本运行。它允许用户在系统启动时自定义一些额外的命令或脚本。 然而，在现代的 Linux 发行版中，使用 systemd 作为初始化系统，因此 /etc/rc.local 文件可能已不再被使用。相反，可以使用 systemd 的单元文件来管理启动和运行服务。</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# cat /etc/rc.local</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> #!/bin/bash</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> #</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # It is highly advisable to create own systemd services or udev rules</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # to run scripts during boot instead of using this file.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> #</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # In contrast to previous versions due to parallel execution during boot</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # this script will NOT be run after all other services.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> #</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # that this script will be executed during boot.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> touch /var/lock/<u>sub</u>sys/local</td> </tr></tbody></div><p style="text-indent:2em;"> 8https://www.elecfans.com/emb/etc/profile</p>

系统级别的 Bash shell 配置文件，它包含了所有用户的全局 shell 配置。当用户登录时，该文件会被加载并执行。 在 /etc/profile 文件中可以定义全局的环境变量、设置 PATH 环境变量、配置系统的默认语言等。</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# cat /etc/profile</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # /etc/profile</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # System wide environment and startup prog<u>ram</u>s, for login setup</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # Functions and aliases go in /etc/bashrc</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # It's NOT a good idea to change this file unless you know what you</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # are doing. It's much better to create a custom.sh shell script in</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # /etc/profile.d/ to make custom changes to your environment, as this</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # will prevent the need for merging in future updates.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> pathmunge () {</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> case ":${PATH}:" in</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> *:"$1":*)</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> ;;</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> *)</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ "$2" = "after" ] ; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> PATH=$PATH:$1</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> else</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> PATH=$1:$PATH</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> esac</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> }</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ -x /usr/bin/id ]; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ -z "$EUID" ]; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # ksh workaround</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> EUID=`/usr/bin/id -u`</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> UID=`/usr/bin/id -ru`</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> USER="`/usr/bin/id -un`"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> LOGNAME=$USER</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> MAIL="/var/spool/mail/$USER"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # Path manipulation</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ "$EUID" = "0" ]; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> pathmunge /usr/sbin</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> pathmunge /usr/local/sbin</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> else</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> pathmunge /usr/local/sbin after</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> pathmunge /usr/sbin after</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> HOSTNAME=`/usr/bin/hostname 2>/dev/null`</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> HISTSIZE=1000</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ "$HISTCONTROL" = "ignorespace" ] ; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> export HISTCONTROL=ignoreboth</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> else</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> export HISTCONTROL=ignoredups</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # By default, we want umask to get set. This sets it for login shell</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # Current threshold for system reserved uid/gids is 200</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # You could check uidgid reservation validity in</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> # /usr/share/doc/setup-*/uidgid file</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ $UID -gt 199 ] && [ "`/usr/bin/id -gn`" = "`/usr/bin/id -un`" ]; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> umask 002</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> else</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> umask 022</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> for i in /etc/profile.d/*.sh /etc/profile.d/sh.local ; do</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ -r "$i" ]; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> if [ "${-#*i}" != "$-" ]; then</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> . "$i"</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> else</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> . "$i" >/dev/null</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> fi</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> done</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;">  </td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> unset i</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> unset -f pathmunge</td> </tr></tbody></div><p style="text-indent:2em;"> 9https://www.elecfans.com/emb/etc/motd</p>

远程连接提示配置文件</p>

讯享网10https://www.elecfans.com/emb/var/log/messages</p>

系统日志文件，记录了系统的各种事件、错误和警告信息。它是许多 Linux 发行版中常见的日志文件之一，用于存储系统级别的日志数据。在 /var/log/messages 文件中，您可以找到诸如系统启动消息、网络连接信息、<u>硬件</u>故障报告、登录和注销事件等系统事件的记录。这些日志可以帮助系统管理员和用户跟踪问题、分析故障和监视系统状况。</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# cat /var/log/messages</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost journal: Runtime journal is using 6.0M (max allowed 48.6M, trying to leave 72.9M free of 480.0M available → current limit 48.6M).</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: Initializing cgroup subsys <u>cpu</u>set</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: Initializing cgroup subsys cpu</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: Initializing cgroup subsys cpuacct</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: Linux version 3.10.0-1160.el7.x86_64 () (gcc version 4.8.5  (Red Hat 4.8.5-44) (GCC) ) #1 SMP Mon Oct 19 1659 UTC 2020</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: Command line: BOOT_IMAGE=/vmlinuz-3.10.0-1160.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet LANG=zh_CN.U<u>TF</u>-8</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: [Firmware Bug]: TSC doesn't count with P0 frequency!</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: e820: B<u>IOS</u>-provided physical RAM map:</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009ebff] usable</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x000000000009ec00-0x000000000009ffff] reserved</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x00000000000<u>dc</u>000-0x00000000000fffff] reserved</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x0000000000-0x000000003fedffff] usable</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x000000003fee0000-0x000000003fefefff] AC<u>PI</u> data</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x000000003feff000-0x000000003fefffff] ACPI NVS</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x000000003ff00000-0x000000003fffffff] usable</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x00000000fec00000-0x00000000fec0ffff] reserved</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: BIOS-e820: [mem 0x00000000fffe0000-0x00000000ffffffff] reserved</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: NX (Execute Disable) protection: active</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: SMBIOS 2.7 present.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: DMI: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: Hypervisor detected: VMware</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 1745 localhost kernel: vmware: TSC freq read from hypervisor : 3193.910 MHz</td> </tr></tbody></div><p style="text-indent:2em;"> 11https://www.elecfans.com/emb/var/log/secure</p>

系统日志文件，记录了与系统安全相关的事件、错误和警告信息。它是许多 Linux 发行版中常见的日志文件之一，用于存储与安全相关的日志数据。在 /var/log/secure 文件中，您可以找到诸如登录和注销事件、使用 sudo 的记录、<u>认证</u>失败尝试以及其他与系统安全相关的事件的记录。这些日志可以帮助系统管理员和用户跟踪安全问题、分析入侵尝试和监视系统安全状况</p>

讯享网  </td> <td style="border-style:none;"> [root@testcentos7 ~]# cat /var/log/secure</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:26:51 localhost polkitd[956]: Lo<u>adi</u>ng rules from directory /etc/polkit-1/rules.d</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:26:51 localhost polkitd[956]: Loading rules from directory /usr/share/polkit-1/rules.d</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:26:51 localhost polkitd[956]: Finished loading, compiling and executing 2 rules</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:26:51 localhost polkitd[956]: Acquired the name org.freedesktop.PolicyKit1 on the system bus</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:26:55 localhost sshd[1521]: Server listening on 0.0.0.0 port 22.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:26:55 localhost sshd[1521]: Server listening on :: port 22.</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:28:51 localhost login: pam_unix(login session opened for user root by LOGIN(uid=0)</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 17:28:51 localhost login: ROOT LOGIN ON tty1</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 18:03:54 localhost polkitd[956]: Registered Authentication Agent for unix-process:1868: (system bus name :1.25 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)</td> </tr><tr><td style="padding:0px 14px;border-style:none;text-align:center;vertical-align:top;color:rgb(191,191,191);">  </td> <td style="border-style:none;"> Jan 10 18:03:55 localhost polkitd[956]: Unregistered Authentication Agent for unix-process:1868: (system b</td> </tr></tbody></div><p style="text-indent:2em;"> 审核编辑：黄飞</p>

 </p>

linux dhclient配置（dhclient配置文件）

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