Add a startup method to Linux (service/script)

# 1. Edit the rc.local file [root@localhost ~]# vi /etc/rc.local

# 2. Modify the rc.local file and add the following command before exit 0. Save and exit.
/etc/init.d/mysqld start #mysql startup/etc/init.d/nginx start #nginx startup supervisord -c /etc/supervisor/supervisord.conf # supervisord startup/bin/bash /server/scripts/test.sh >/dev/null 2>/dev/null

# 3. Finally, modify the execution permission of the rc.local file [root@localhost ~]# chmod +x /etc/rc.local
[root@localhost ~]# chmod 755 /etc/rc.local

# 1. Move the (script) startup file to the /etc/init.d/ or /etc/rc.d/init.d/ directory. (The former is a soft link to the latter)
mv /www/wwwroot/test.sh /etc/rc.d/init.d

# 2. Be sure to add the following three lines of code before the startup file, otherwise it will prompt that chkconfig is not supported.
#!/bin/sh tells the system to use the shell, so all shell scripts are like this #chkconfig: 35 20 80 represent the run level, startup priority, and shutdown priority respectively. This line of code must #description: http server You can use it as you like! ! ! This line of code must be /bin/echo $(/bin/date +%F_%T) >> /tmp/test.log

# 3. Add executable permissions to the script chmod +x /etc/rc.d/init.d/test.sh

# 4. Add the script to the automatic startup project. Add to chkconfig and start automatically at boot.
[root@localhost ~]# cd /etc/rc.d/init.d
[root@localhost ~]# chkconfig --add test.sh
[root@localhost ~]# chkconfig test.sh on

# 5. Turn off boot [root@localhost ~]# chkconfig test.sh off

# 6. Delete test.sh from chkconfig management
[root@localhost ~]# chkconfig --del test.sh

# 7. View chkconfig management [root@localhost ~]# chkconfig --list test.sh

[Unit]: Description of the service Description: Describe the service After: Describe the service category [Service] Settings for service running parameters Type=forking is the form of background running ExecStart is the specific running command of the service ExecReload is the restart command of the service ExecStop is the stop command of the service PrivateTmp=True means to allocate independent temporary space to the service Note: All start, restart, and stop commands require the use of absolute paths [Install] Related settings for service installation, which can be set to multi-user WantedBy=multi-user.target 

[root@localhost ~]# cat /usr/lib/systemd/system/nginx.service
[root@localhost ~]# cat /usr/lib/systemd/system/supervisord.service

Set up automatic startup [root@localhost ~]# systemctl enable nginx.service    
[root@localhost ~]# systemctl enable supervisord

Stop booting automatically [root@localhost ~]# systemctl disable nginx.service
[root@localhost ~]# systemctl disable supervisord

Verify whether it is started at boot [root@localhost ~]# systemctl is-enabled nginx
[root@localhost ~]# systemctl is-enabled supervisord

Start nginx service [root@localhost ~]# systemctl start nginx.service

Stop nginx service [root@localhost ~]# systemctl start nginx.service

Restart nginx service [root@localhost ~]# systemctl restart nginx.service

View the current status of the nginx service [root@localhost ~]# systemctl status nginx.service

View all started services [root@localhost ~]# systemctl list-units --type=service

# supervisord.service process management service file [Unit]
Description=Process Monitoring and Control Daemon # Define the content yourself: Description=Supervisor daemon
After=rc-local.service nss-user-lookup.target

[Service]
Type=forking
ExecStart=/usr/bin/supervisord -c /etc/supervisor/supervisord.conf
ExecStop= /usr/bin/supervisorctl shutdown 
ExecReload=/usr/bin/supervisorctl reload
Restart=on-failure
RestartSec=42s
KillMode=process 

[Install]
WantedBy=multi-user.target

# nginx.service service file [Unit]
Description=nginx - high performance web server
After=network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
ExecStart=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/usr/local/nginx/sbin/nginx -s stop

[Install]
WantedBy=multi-user.target

# redis.service service file [Unit]
Description=Redis
After=network.target remote-fs.target nss-lookup.target

[Service]
Type=forking
ExecStart=/usr/local/bin/redis-server /etc/redis.conf
ExecStop=kill -INT `cat /tmp/redis.pid`
User=www
Group=www

[Install]
WantedBy=multi-user.target