08-MongoDB集群运维-服务开机自启

环境

操作系统：CentOS 7
mongodb程序路径：/home/mongodb/software/mongodb-linux-x86_64-rhel70-4.2.1
mongodb日志文件路径：/opt/mongo/logs/

新建服务文件

/lib/systemd/system/下新建mongodb.service文件

[mongodb@mongodb01 ~]$ sudo vim /lib/systemd/system/mongodb.service

[Unit]
Description=mongodb
After=network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
ExecStart=/home/mongodb/software/mongodb-linux-x86_64-rhel70-4.2.1/bin/mongod --config /opt/mongo/mongo.conf
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/home/mongodb/software/mongodb-linux-x86_64-rhel70-4.2.1/bin/mongod --shutdown --config /opt/mongo/mongo.conf
PrivateTmp=true
[Install] 
WantedBy=multi-user.target

需注意修改代码中mongod、mongo.conf路径

设置文件权限

sudo chmod 754 /lib/systemd/system/mongodb.service

读写运行权限赋予文件所有者，读运行的权限赋予群组用户，读的权限赋予其他用户

设置开机启动

如果本机MongoDB正在运行，先停止，再依次执行命令测试

# 设置启动
sudo systemctl start mongodb.service
# 设置关闭
sudo systemctl stop mongodb.service
# 设置开机自启
sudo systemctl enable mongodb.service

重启验证

[mongodb@mongodb01 ~]$ sudo reboot

# 登录验证
[C:\~]$ ssh mongodb@192.168.153.128


Connecting to 192.168.153.128:22...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.

Last login: Tue Nov  5 11:36:48 2019 from 192.168.153.1
[mongodb@mongodb01 ~]$ sudo netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:27017           0.0.0.0:*               LISTEN      1456/mongod         
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      1/systemd           
tcp        0      0 192.168.122.1:53        0.0.0.0:*               LISTEN      1411/dnsmasq        
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1175/sshd           
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      1171/cupsd          
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1420/master         
tcp        0      0 127.0.0.1:6010          0.0.0.0:*               LISTEN      1973/sshd: mongodb@ 
tcp6       0      0 :::111                  :::*                    LISTEN      1/systemd           
tcp6       0      0 :::22                   :::*                    LISTEN      1175/sshd           
tcp6       0      0 ::1:631                 :::*                    LISTEN      1171/cupsd          
tcp6       0      0 ::1:25                  :::*                    LISTEN      1420/master         
tcp6       0      0 ::1:6010                :::*                    LISTEN      1973/sshd: mongodb@ 
[mongodb@mongodb01 ~]$ 

可能遇到问题

[mongodb@mongodb03 ~]$ sudo systemctl start mongodb.service
Warning: mongodb.service changed on disk. Run 'systemctl daemon-reload' to reload units.

[mongodb@mongodb01 ~]$ sudo systemctl start mongodb.service
Job for mongodb.service failed because the control process exited with error code. See "systemctl status mongodb.service" and "journalctl -xe" for details.
[mongodb@mongodb01 ~]$ 

问题原因零

代码拷贝不完全，可通过cat /lib/systemd/system/mongodb.service查看

问题原因一

服务正在运行，需先停止，注意随时查看正在运行服务，sudo netstat -ntlp，注意关闭或重启服务

问题原因二

文件中启动命令路径有误，重点查看ExecStart对应命令，单独执行看是否成功，ExecReload、ExecStop非必须