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Update systemctl.md
make systemctl list-units --type=service correct
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‎command/systemctl.md‎

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systemctl
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===
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系统服务管理器指令
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## 补充说明
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**systemctl命令** 是系统服务管理器指令，它实际上将 service 和 chkconfig 这两个命令组合到一起。
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<table>
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<tbody>
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<tr>
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<td>任务</td>
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<td>旧指令</td>
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<td>新指令</td>
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</tr>
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<tr>
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<td>使某服务自动启动</td>
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<td>chkconfig --level 3 httpd on</td>
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<td>systemctl enable httpd.service</td>
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</tr>
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<tr>
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<td>使某服务不自动启动</td>
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<td>chkconfig --level 3 httpd off</td>
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<td>systemctl disable httpd.service</td>
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</tr>
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<tr>
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<td>检查服务状态</td>
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<td>service httpd status</td>
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<td>systemctl status httpd.service （服务详细信息） systemctl is-active httpd.service （仅显示是否 Active)</td>
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</tr>
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<tr>
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<td>显示所有已启动的服务</td>
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<td>chkconfig --list</td>
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<td>systemctl list-units --type=service</td>
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</tr>
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<tr>
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<td>启动某服务</td>
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<td>service httpd start</td>
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<td>systemctl start httpd.service</td>
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</tr>
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<tr>
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<td>停止某服务</td>
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<td>service httpd stop</td>
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<td>systemctl stop httpd.service</td>
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</tr>
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<tr>
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<td>重启某服务</td>
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<td>service httpd restart</td>
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<td>systemctl restart httpd.service</td>
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</tr>
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</tbody>
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</table>
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### 实例
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1.启动nfs服务
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```
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systemctl start nfs-server.service
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```
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2.设置开机自启动
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```
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systemctl enable nfs-server.service
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```
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3.停止开机自启动
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```
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systemctl disable nfs-server.service
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```
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4.查看服务当前状态
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```
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systemctl status nfs-server.service
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```
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5.重新启动某服务
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```
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systemctl restart nfs-server.service
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```
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6.查看所有已启动的服务
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```
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systemctl list -units --type=service
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```
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开启防火墙22端口
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```
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iptables -I INPUT -p tcp --dport 22 -j accept
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```
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如果仍然有问题，就可能是SELinux导致的
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关闭SElinux：
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修改`/etc/selinux/config`文件中的`SELINUX=””`为disabled，然后重启。
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彻底关闭防火墙：
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```
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sudo systemctl status firewalld.service
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sudo systemctl stop firewalld.service          
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sudo systemctl disable firewalld.service
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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systemctl
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===
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系统服务管理器指令
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6+
## 补充说明
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**systemctl命令** 是系统服务管理器指令，它实际上将 service 和 chkconfig 这两个命令组合到一起。
9+
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<table>
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12+
<tbody>
13+
14+
<tr>
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16+
<td>任务</td>
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18+
<td>旧指令</td>
19+
20+
<td>新指令</td>
21+
22+
</tr>
23+
24+
<tr>
25+
26+
<td>使某服务自动启动</td>
27+
28+
<td>chkconfig --level 3 httpd on</td>
29+
30+
<td>systemctl enable httpd.service</td>
31+
32+
</tr>
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<tr>
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<td>使某服务不自动启动</td>
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<td>chkconfig --level 3 httpd off</td>
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<td>systemctl disable httpd.service</td>
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</tr>
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<tr>
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<td>检查服务状态</td>
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<td>service httpd status</td>
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<td>systemctl status httpd.service （服务详细信息） systemctl is-active httpd.service （仅显示是否 Active)</td>
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</tr>
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<tr>
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<td>显示所有已启动的服务</td>
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<td>chkconfig --list</td>
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<td>systemctl list-units --type=service</td>
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</tr>
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<tr>
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<td>启动某服务</td>
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<td>service httpd start</td>
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<td>systemctl start httpd.service</td>
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</tr>
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<tr>
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<td>停止某服务</td>
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<td>service httpd stop</td>
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<td>systemctl stop httpd.service</td>
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</tr>
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<tr>
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<td>重启某服务</td>
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<td>service httpd restart</td>
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<td>systemctl restart httpd.service</td>
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</tr>
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</tbody>
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</table>
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### 实例
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1.启动nfs服务
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```
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systemctl start nfs-server.service
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```
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2.设置开机自启动
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```
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systemctl enable nfs-server.service
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```
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3.停止开机自启动
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```
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systemctl disable nfs-server.service
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```
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4.查看服务当前状态
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```
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systemctl status nfs-server.service
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```
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5.重新启动某服务
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```
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systemctl restart nfs-server.service
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```
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6.查看所有已启动的服务
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```
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systemctl list-units --type=service
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```
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开启防火墙22端口
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```
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iptables -I INPUT -p tcp --dport 22 -j accept
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```
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142+
如果仍然有问题，就可能是SELinux导致的
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144+
关闭SElinux：
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修改`/etc/selinux/config`文件中的`SELINUX=””`为disabled，然后重启。
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彻底关闭防火墙：
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```
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sudo systemctl status firewalld.service
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sudo systemctl stop firewalld.service          
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sudo systemctl disable firewalld.service
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->

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