docker之使用supervisor管理多个进程
docker题外话：centos7安装supervisor：
源码编译安装：
下载源码文件：supervisor-3.3.1.tar.gz下载地址：https://pypi.python.org/pypi/supervisor
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安装：
# tar -zxf supervisor-3.3.1.tar.gz
# cd supervisor-3.3.1/
# python setup.py install
检查是否安装成功：
登陆python控制台输入import supervisor 查看是否能成功加载
# python
Python 2.7.5 (default, Sep 15 2016, 22:37:39)
on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import supervisor
>>>
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生成配置文件：
# mkdir /etc/supervisor
# echo_supervisord_conf > /etc/supervisor/supervisord.conf
# grep -E -v '^;|^$' /etc/supervisor/supervisord.conf
file=/tmp/supervisor.sock ; (the path to the socket file)
logfile=/tmp/supervisord.log ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB ; (max main logfile bytes b4 rotation;default 50MB)
logfile_backups=10 ; (num of main logfile rotation backups;default 10)
loglevel=info ; (log level;default info; others: debug,warn,trace)
pidfile=/tmp/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=false ; (start in foreground if true;default false)
minfds=1024 ; (min. avail startup file descriptors;default 1024)
minprocs=200 ; (min. avail process descriptors;default 200)
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
serverurl=unix:///tmp/supervisor.sock ; use a unix:// URLfor a unix socket
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启动服务：
# supervisord -c /etc/supervisor/supervisord.conf
关闭服务：
# supervisorctl shutdown
Shut down
查看状态：
# supervisorctl status
启动或停止某一个服务：
supervisorctl stop|start program_name
yum直接安装：
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rpm -Uvh https://mirrors.ustc.edu.cn/fedora/epel/7/x86_64/e/epel-release-7-8.noarch.rpm
yum update;yum -y install supervisor
cat /etc/supervisord.conf
supervisord -c /etc/supervisord.conf
说明：
Docker 容器在启动的时候开启单个进程，比如，一个 ssh 或者 apache 的 daemon 服务。但我们经常需要在一个机器上开启多个服务，这可以有很多方法，最简单的就是把多个启动命令放到一个启动脚本里面，启动的时候直接启动这个脚本，另外就是安装进程管理工具
使用进程管理工具 supervisor 来管理容器中的多个进程。使用 Supervisor 可以更好的控制、管理、重启我们希望运行的进程
在这里我们演示一下容器中如何同时使用 ssh 和 tomcat 服务
配置：
首先创建Dockerfile文件：
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# vim Dockerfile
# centos:ssh
#
# VERSION 0.0.1
FROM centos
MAINTAINER shencj "732233048@qq.com"
#ssh
RUN yum install -y openssh openssh-server openssh-clients
RUN mkdir /var/run/sshd
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
RUN sed -i 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
RUN sed -i 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
RUN /bin/echo 'root:123456' |chpasswd
RUN /bin/sed -i 's/.*session.*required.*pam_loginuid.so.*/session optional pam_loginuid.so/g' /etc/pam.d/sshd
RUN /bin/echo -e "LANG=\"en_US.UTF-8\"" > /etc/default/local
#tomcat
ADD apache-tomcat-7.0.41.tar.gz /usr/local/src/
COPY jdk-7u80-linux-x64.rpm /usr/local/src/
WORKDIR /usr/local/src/
RUN rpm -ivh jdk-7u80-linux-x64.rpm
ENV JAVA_HOME /usr/java/jdk1.7.0_80
ENV PATH $PATH:$JAVA_HOME/bin
ENV CLASSPATH .:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
#RUN java -version
RUN mkdir -p /usr/local/tools
RUN cp -r apache-tomcat-7.0.41 /usr/local/tools/tomcat7_8080
#supervisor
RUN rpm -Uvh https://mirrors.ustc.edu.cn/fedora/epel/7/x86_64/e/epel-release-7-8.noarch.rpm
RUN yum update;yum -y install supervisor
RUN mkdir -p /etc/supervisor/
COPY supervisord.conf /etc/supervisor/
EXPOSE 22 8080
CMD supervisord -c /etc/supervisor/supervisord.conf
#CMD ["supervisord","-c","/etc/supervisor/supervisord.conf"]
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# vim supervisord.conf
file=/var/run/supervisor/supervisor.sock ; (the path to the socket file)
logfile=/var/run/supervisor/supervisord.log ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB ; (max main logfile bytes b4 rotation;default 50MB)
logfile_backups=10 ; (num of main logfile rotation backups;default 10)
loglevel=info ; (log level;default info; others: debug,warn,trace)
pidfile=/var/run/supervisor/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=true ; (start in foreground if true;default false)
minfds=1024 ; (min. avail startup file descriptors;default 1024)
minprocs=200 ; (min. avail process descriptors;default 200)
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
serverurl=unix:///var/run/supervisor/supervisor.sock ; use a unix:// URLfor a unix socket
command=/usr/sbin/sshd -D
command=/usr/local/tools/tomcat7_8080/bin/catalina.sh run
注意：
serverurl=unix:///var/run/supervisor/supervisor.sock ： 这个建议不要修改
nodaemon=true ： 设置为true
command=/usr/local/tools/tomcat7_8080/bin/catalina.sh run ：这个必须这样写（supervisor管理tomcat必须这样启动，其他方式好像都有问题），参考：http://serverfault.com/questions/425132/controlling-tomcat-with-supervisor
创建镜像：
# docker build -t shencj/centos-ssh-tomcat:v1 .
运行容器：
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# docker run -d --name ssh-tomcat --restart=always -p 4426:22 -p 82:8080 shencj/centos-ssh-tomcat:v1
cc8006c07f6c703c476c69ecc3699f0c9a1e5f456949e65a8e92b55dafa8be1e
#
查看容器：
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# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cc8006c07f6c shencj/centos-ssh-tomcat:v1 "/bin/sh -c 'supervis" 56 seconds ago Up 54 seconds 0.0.0.0:4426->22/tcp, 0.0.0.0:82->8080/tcp ssh-tomcat
登录容器：
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# ssh localhost -p 4426
root@localhost's password:
# ps -ef
UID PID PPIDC STIME TTY TIME CMD
root 1 00 03:56 ? 00:00:00 /usr/bin/python /usr/bin/supervisord -c /etc/supervisor/supervisord.conf
root 7 10 03:56 ? 00:00:00 /usr/sbin/sshd -D
root 8 13 03:56 ? 00:00:03 /usr/java/jdk1.7.0_80/bin/java -Djava.util.logging.config.file=/usr/local/tools/tomcat7_8080/conf/logging.properties -Djava.util.logging.manager=org.apa
root 30 70 03:58 ? 00:00:00 sshd: root@pts/0
root 32 300 03:58 pts/0 00:00:00 -bash
root 45 320 03:58 pts/0 00:00:00 ps -ef
# supervisorctl status
sshd RUNNING pid 7, uptime 0:02:58
tomcat RUNNING pid 8, uptime 0:02:58
访问tomcat：
http://ip:82
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