Controlling Nginx with Supervisor

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This example shows us how to control nginx with supervisor so when nginx goes down for whatever reason, supervisor will bring it up again as a "foreground" process not as a "daemon".

Important

Supervisor uses daemon off; to start Nginx. The daemon off; directive tells Nginx to stay in the foreground. The sudo service nginx stop/start/restart commands won’t work. For more information read Stack Overflow answer.

Current nginx process

As you can see below, Nginx is running in “daemon on” mode.

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root@us:~# ps aux | grep nginx
root       12527  0.0  0.2 132576  1064 ?        Ss   09:52   0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
www-data   12529  0.2  1.6 134176  8092 ?        S    09:52   0:07 nginx: worker process
www-data   12530  0.0  0.7 132808  3800 ?        S    09:52   0:00 nginx: cache manager process
root       13154  0.0  0.1   8900   660 pts/0    S+   10:38   0:00 grep --color=auto nginx

Install & Setup supervisor

Install

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sudo apt update
sudo apt install supervisor

Setup configuration for Nignx

Add nginx.conf file: /etc/supervisor/conf.d/nginx.conf

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[program:nginx]
command=/usr/sbin/nginx -g "daemon off;"
autostart=true
autorestart=true
startretries=5
numprocs=1
startsecs=0
process_name=%(program_name)s_%(process_num)02d
stderr_logfile=/var/log/supervisor/%(program_name)s_stderr.log
stderr_logfile_maxbytes=10MB
stdout_logfile=/var/log/supervisor/%(program_name)s_stdout.log
stdout_logfile_maxbytes=10MB

Let supervisor know about new config.

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$ sudo supervisorctl reread
nginx: available

Stop and disable the Nginx service

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sudo systemctl stop nginx
sudo systemctl disable nginx

Let supervisor start nginx service.

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$ sudo supervisorctl update
nginx: added process group

Verify if supervisor started nginx service.

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$ sudo supervisorctl
nginx:nginx_00                   RUNNING   pid 18429, uptime 0:01:47
supervisor>

Check

As you can see below, Nginx is running in “daemon off” mode.

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root@us:~# ps aux | grep nginx
root         692  0.3  1.5 132576  7768 ?        S    10:56   0:00 nginx: master process /usr/sbin/nginx -g daemon off;
www-data     703  1.1  1.4 133140  6884 ?        S    10:56   0:00 nginx: worker process
www-data     704  0.0  0.7 132808  3620 ?        S    10:56   0:00 nginx: cache manager process
www-data     708  0.0  0.7 132808  3620 ?        S    10:56   0:00 nginx: cache loader process
root         800  0.0  0.1   8900   736 pts/0    S+   10:57   0:00 grep --color=auto nginx

Restart nginx with supervisor

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$ sudo supervisorctl
nginx:nginx_00                   RUNNING   pid 18429, uptime 0:01:47
supervisor> restart nginx:nginx_00

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原文地址：https://www.xiaotanzhu.com/linux/control-nginx-with-supervisor.html