Docker容器运行多条命令(supervisor)

爱被打了一巴掌 2021-12-24 10:39 544阅读 0赞

# 一, 简介 #

Dockerfile 运行只支持一条命令，当在Docker里要运行多条命令，用supervisor来管理就比较合适了。  
Supervisor是一个 Python 开发的 client/server 系统，可以管理和监控类 UNIX 操作系统上面的进程。它可以同时启动，关闭多个进程，使用起来特别的方便。

## 组成部分 ##

supervisor 主要由两部分组成：

1.  supervisord(server 部分)：主要负责管理子进程，响应客户端命令以及日志的输出等；
2.  supervisorctl(client 部分)：命令行客户端，用户可以通过它与不同的 supervisord 进程联系，获取子进程的状态等。

# 二，存在的问题——日志不输出 #

但是使用supervisor，Django运行的日志就不会在Docker里输出了，默认的输出如下：

2018-03-28 06:48:20,292 CRIT Supervisor running as root (no user in config file)
    2018-03-28 06:48:20,308 INFO supervisord started with pid 1
    2018-03-28 06:48:21,310 INFO spawned: 'celery_beat' with pid 7
    2018-03-28 06:48:21,312 INFO spawned: 'celery_worker' with pid 8
    2018-03-28 06:48:21,313 INFO spawned: 'django' with pid 9
    2018-03-28 06:48:22,315 INFO success: celery_beat entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
    2018-03-28 06:48:22,315 INFO success: celery_worker entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
    2018-03-28 06:48:22,315 INFO success: django entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)

上面的Docker中supervisor配置如下：

[supervisord]
    nodaemon=true
     
    [program:django]
    command=python manage.py runserver 0.0.0.0:8080
     
    [program:celery_worker]
    command=python manage.py celery worker -c 4 -l info
     
    [program:celery_beat]
    command=python manage.py celery beat

这样的配置在容器中是同时运行Django，celery。

# 三，解决方案 #

## 1，改进后的配置方案 ##

[inet_http_server]
    port=9001
    username=abc
    password=123456
     
    [supervisord]
    nodaemon=true
    logfile=/var/log/supervisor/supervisord.log ; (main log file;default $CWD/supervisord.log)
    pidfile=/var/run/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
    childlogdir=/var/log/supervisor            ; ('AUTO' child log dir, default $TEMP)
     
    [program:django]
    command=python manage.py runserver 0.0.0.0:8080
    #stdout_logfile = /var/log/supervisord/django_stdout.log
    loglevel=info
    redirect_stderr=true
     
    [program:celery_worker]
    command=python manage.py celery worker -c 4 -l info
    loglevel=info
    redirect_stderr=true
     
    [program:celery_beat]
    command=python manage.py celery beat
    loglevel=info
    redirect_stderr=true

实测发现Django的日志输出会写到stderr.log文件中，所以在配置文件中将错误日志重定向到标准日志里;

redirect_stderr=true

容器中的生成的日志文件如下：

root@a16bc77e96bc:/var/log/supervisor# ls
    celery_beat-stderr---supervisor-rSPQ7E.log    django-stderr---supervisor-9LS_KA.log
    celery_beat-stdout---supervisor-t5Q4UI.log    django-stdout---supervisor-cTSBmq.log
    celery_worker-stderr---supervisor-TRFzc7.log  supervisord.log
    celery_worker-stdout---supervisor-xNgeBU.log

## 2，查看日志 ##

运行容器时，将9001端口映射出去，通过ip:9001访问：  
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点击 Tail -f 查看各个进程的日志。

# 参考 #

> [http://debugo.com/docker-supervisord/][http_debugo.com_docker-supervisord]

> [http://blog.csdn.net/zhousenshan/article/details/52988885][http_blog.csdn.net_zhousenshan_article_details_52988885]

> [supervisor配置][supervisor]

作者博客：[http://kekefund.com/2018/03/30/supervisor/][http_kekefund.com_2018_03_30_supervisor]

[http_debugo.com_docker-supervisord]: https://link.jianshu.com?t=http%3A%2F%2Fdebugo.com%2Fdocker-supervisord%2F
[http_blog.csdn.net_zhousenshan_article_details_52988885]: https://link.jianshu.com?t=http%3A%2F%2Fblog.csdn.net%2Fzhousenshan%2Farticle%2Fdetails%2F52988885
[supervisor]: https://link.jianshu.com?t=http%3A%2F%2Fsupervisord.org%2Fconfiguration.html
[http_kekefund.com_2018_03_30_supervisor]: https://link.jianshu.com?t=http%3A%2F%2Fkekefund.com%2F2018%2F03%2F30%2Fsupervisor%2F