容器多进程管理工具——s6-overlay

#### 1. 背景
由于工作需要，让多个进程跑在一个容器里，虽然一般不建议这么做，但你懂的，不可抗力.
关于s6-overlay的介绍不是很多，主要就是[github](https://github.com/just-containers/s6-overlay#dropping-privileges "github")上的文档，本文主要参考就是它，仅用于记录个人测试使用经历，更多使用介绍请参考官方文档
#### 2. Dockerfile

```
FROM alpine:3.10
ENV LANG C.UTF-8
ENV TIMEZONE Asia/Shanghai

RUN  echo -e "http://mirrors.aliyun.com/alpine/v3.10/main\nhttp://mirrors.aliyun.com/alpine/v3.10/community" > /etc/apk/repositories \
     && apk add -U tzdata && ln -snf /usr/share/zoneinfo/${TIMEZONE} /etc/localtime && echo "${TIMEZONE}" > /etc/timezone \
     && apk add curl

ADD s6-overlay-amd64.tar.gz /
COPY  ./service-script-permisson /etc/fix-attrs.d/
ENTRYPOINT ["/init"]
CMD ["/bin/s6-svscan", "/opt/service"]
```

#### 3. service-script-permisson
```
作用：放在/etc/fix-attrs.d/目录中，用于初始化service中各服务的文件夹和文件的权限，文件名字随意
$ cat service-script-permisson 
/opt/service true root 0751 0700
```

#### 4. README

```
docker build -t s6:v1 .
docker run --rm -it -v /opt/service:/opt/service s6:v1
```

#### 5. service示例：/opt/service

```
/opt/service/
├── app1
│   ├── finish
│   └── run
├── app2
│   ├── finish
│   └── run
├── app3
│   ├── finish
│   └── run
└── catalina
    ├── finish
    └── run
 
[root@localhost]# cat /opt/service/catalina/run
#!/bin/sh
sed -i '2a CATALINA_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,suspend=n,server=y"' /usr/local/tomcat/bin/catalina.sh
exec /usr/local/tomcat/bin/catalina.sh run

[root@localhost]# cat /opt/service/catalina/finish 
#!/bin/sh
echo "tomcat stopped"

[root@localhost]# cat app1/run 
#!/bin/sh
echo "app1 start" >> /tmp/app.log
sleep 5
echo "first=1" >> /opt/start.log
sleep 20

[root@localhost]# cat app1/finish
#!/bin/sh
echo "app1 stopped" >> /tmp/app.log
> /opt/start.log

[root@localhost]# cat app2/run 
#!/bin/sh
sleep 5
if [ `cat /opt/start.log | grep 'first=1'` ];then
    echo "app2 start !" >> /tmp/app.log
    tail -f /tmp/app.log
fi

[root@localhost]# cat app2/finish 
#!/bin/sh
echo "app stopped" >> /tmp/app.log

[root@localhost]# cat app3/run 
#!/bin/sh

sleep 5
if [ `cat /opt/start.log | grep 'first=1'` ];then
    echo "app3 start !" >> /tmp/app.log
    tail -f /tmp/app.log
fi

[root@localhost]# cat app3/finish 
#!/bin/sh
echo "app3 stopped" >> /tmp/app.log

上述脚本中catalina和app1会先启动，app2 app3会等待5秒钟，检测/opt/start.log中是否有'first=1'，如果有则启动，没有则循环检测
app1在20秒之后会退出，s6会自动检测让app1重启
```

#### 6. github网址

```
https://github.com/just-containers/s6-overlay#dropping-privileges
```

容器多进程管理工具——s6-overlay

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