56 lines
2.0 KiB
Markdown
56 lines
2.0 KiB
Markdown
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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| 任务 | 旧指令 | 新指令 |
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| ---- | ---- | ---- |
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| 使某服务自动启动 | chkconfig --level 3 httpd on | systemctl enable httpd.service |
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| 使某服务不自动启动 | chkconfig --level 3 httpd off | systemctl disable httpd.service |
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| 检查服务状态 | service httpd status | systemctl status httpd.service （服务详细信息） systemctl is-active httpd.service （仅显示是否 Active) |
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| 显示所有已启动的服务 | chkconfig --list | systemctl list-units --type=service |
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| 启动服务 | service httpd start | systemctl start httpd.service |
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| 停止服务 | service httpd stop | systemctl stop httpd.service |
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| 重启服务 | service httpd restart | systemctl restart httpd.service |
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| 重载服务 | service httpd reload | systemctl reload httpd.service |
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### 实例
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```shell
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systemctl start nfs-server.service . # 启动nfs服务
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systemctl enable nfs-server.service # 设置开机自启动
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systemctl enable nfs-server.service --now # 设置开机自启动，并立刻启动
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systemctl disable nfs-server.service # 停止开机自启动
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systemctl disable nfs-server.service --now # 停止开机自启动，并立刻停止
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systemctl status nfs-server.service # 查看服务当前状态
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systemctl restart nfs-server.service # 重新启动某服务
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systemctl list-units --type=service # 查看所有已启动的服务
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```
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开启防火墙22端口
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```shell
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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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```shell
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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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