关于 docker-compose 问题

[aaa5838769]

• 今天刚学习 docker-compose，我使用 docker-compose+Dockerfile。只创建了容器了，没有运行容器，直接退出了，不知道是什么原因。
• 下面是配置文件和启动命令

[root@localhost compose]# cat docker-compose.yml 
version: '3'
services:
  web:
    build: .
    ports:
      - "8888:80"
[root@localhost compose]# cat Dockerfile 
FROM centos:7
MAINTAINER xy
RUN yum install -y httpd php php-gd php-mysql;systemctl enable httpd.service
RUN echo "<?php phpinfo()?>" > /var/www/html/index.php
EXPOSE 80

[root@localhost compose]# docker-compose up
 ---> d45344adbd48
Step 6/6 : EXPOSE 80
 ---> Running in 8ba263e41682
Removing intermediate container 8ba263e41682
 ---> b826f2af0a7c
Successfully built b826f2af0a7c
Successfully tagged compose_web:latest
WARNING: Image for service web was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating compose_web_1 ... 
Creating compose_web_1 ... done
Attaching to compose_web_1
compose_web_1 exited with code 0

[root@localhost compose]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

[root@localhost compose]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS               NAMES
69675d705d29        compose_web         "/bin/bash"              14 seconds ago      Exited (0) 14 seconds ago                       compose_web_1
54794397b730        6d53ff0be550        "/bin/sh -c 'yum ins …"   2 hours ago         Exited (1) 2 hours ago    

[root@localhost compose]# docker-compose ps
    Name         Command    State    Ports 
------------------------------------------
compose_web_1   /bin/bash   Exit 0 

[vissssa]

docker-compose.yml 加个 command 就有显示了

[keepeye]

看 dockerfile 你没运行服务啊，CMD 呢？

[keepeye]

```
FROM ubuntu:14.04
MAINTAINER xxx
ADD bin/mtd /root/run
CMD ["/root/run"]
```

[kaneg]

docker 默认运行结束后就退出了，你需要一个不会结束的程序，比如 sleep infinity 或者 cat

[aaa5838769]

@keepeye 我的 Dockerfile，RUN 加了这么一句话 systemctl enable httpd.service

[aaa5838769]

@vissssa 好的，我一会试试，刚学习，很多知识点不知道

[aaa5838769]

@vissssa docker-compose.yml command 可以执行这句话不 systemctl start httpd，需要加别的参数来配合不？

[keepeye]

@aaa5838769 httpd 不要后台运行，docker 要求前台运行的程序，像 top，tail -f 等，否则 docker 命令跑完了直接就 exit 了

[BlackHole1]

最后加个 CMD bash