如何设置 supervisor 管理的子程序只运行一次？
2017-10-26 by dongnan
目标
- 设置
supervisor管理的子程序，init优先启动(第一顺序)。 - 设置
init子程序，只运行一次即可(如初始化场景)。
环境
软件版本
supervisord:3.0 On Debian 8 On Docker 17.05.0-ce
supervisor
supervisord 运行在容器之上，并管理 3个子程序:
- init:
/root/init.sh，一个用于项目初始化的脚本程序。 - nginx:
web服务器程序。 - php-fpm:
php代码解析程序。
步骤
配置文件
supervisor
cat /etc/supervisor/supervisord.conf
[supervisord]
nodaemon=true
pidfile=/var/run/supervisord.pid
logfile=/var/log/supervisor/supervisord.log
[program:init]
command=/bin/bash /root/init.sh
priority=998
autorestart=false
startretries=0
[program:nginx]
command=/usr/sbin/nginx -g "daemon off;"
[program:php-fpm]
command=/usr/local/sbin/php-fpm -c /usr/local/etc/php/php.ini -y /usr/local/etc/php-fpm.conf -F
注意，priority 默认值是 999 ，autorestart 默认值是 true 。
脚本文件
cat /root/init.sh
#!/bin/bash
echo `date -R` >> /tmp/init.log
启动容器
docker start test
验证
子程序输出日志
docker exec -ti test cat /tmp/init.log
Fri, 22 Sep 2017 19:18:09 +0800
守护进程日志
docker exec -ti test tail /var/log/supervisor/supervisord.log
2017-09-22 19:18:08,408 CRIT Supervisor running as root (no user in config file)
2017-09-22 19:18:08,449 INFO supervisord started with pid 1
2017-09-22 19:18:09,452 INFO spawned: 'init' with pid 8
2017-09-22 19:18:09,454 INFO spawned: 'nginx' with pid 9
2017-09-22 19:18:09,457 INFO spawned: 'php-fpm' with pid 10
2017-09-22 19:18:09,476 INFO exited: init (exit status 0; not expected)
2017-09-22 19:18:09,524 INFO gave up: init entered FATAL state, too many start retries too quickly
2017-09-22 19:18:10,567 INFO success: nginx entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)2017-09-22 19:18:10,567 INFO success: php-fpm entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
参考
- http://zongming.net/read-1151#1210