| 1 | systemctl
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| 2 | ===
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| 3 |
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| 4 | 系统服务管理器指令
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| 5 |
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| 6 | ## 补充说明
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| 7 |
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| 8 | **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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| 9 |
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| 10 | | 任务 | 旧指令 | 新指令 |
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| 11 | | ---- | ---- | ---- |
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| 12 | | 使某服务自动启动 | chkconfig --level 3 httpd on | systemctl enable httpd.service |
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| 13 | | 使某服务不自动启动 | chkconfig --level 3 httpd off | systemctl disable httpd.service |
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| 14 | | 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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| 15 | | 显示所有已启动的服务 | chkconfig --list | systemctl list-units --type=service |
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| 16 | | 启动某服务 | service httpd start | systemctl start httpd.service |
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| 17 | | 停止某服务 | service httpd stop | systemctl stop httpd.service |
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| 18 | | 重启某服务 | service httpd restart | systemctl restart httpd.service |
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| 19 |
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| 20 | ### 实例
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| 21 |
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| 22 | ```shell
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| 23 | systemctl start nfs-server.service . # 启动nfs服务
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| 24 | systemctl enable nfs-server.service # 设置开机自启动
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| 25 | systemctl disable nfs-server.service # 停止开机自启动
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| 26 | systemctl status nfs-server.service # 查看服务当前状态
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| 27 | systemctl restart nfs-server.service # 重新启动某服务
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| 28 | systemctl list-units --type=service # 查看所有已启动的服务
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| 29 | ```
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| 30 |
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| 31 | 开启防火墙22端口
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| 32 |
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| 33 | ```shell
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| 34 | iptables -I INPUT -p tcp --dport 22 -j accept
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| 35 | ```
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| 36 |
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| 37 | 如果仍然有问题，就可能是SELinux导致的
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| 38 |
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| 39 | 关闭SElinux：
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| 40 |
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| 41 | 修改`/etc/selinux/config`文件中的`SELINUX=""`为disabled，然后重启。
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| 42 |
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| 43 | 彻底关闭防火墙：
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| 44 |
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| 45 | ```shell
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| 46 | sudo systemctl status firewalld.service
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| 47 | sudo systemctl stop firewalld.service
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| 48 | sudo systemctl disable firewalld.service
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| 49 | ```
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| 50 |
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| 52 |
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