实验环境centos7、docker私有仓库
主机地址192.168.200.104（又是负载均衡）

首先编写docker-compose.yml文件

[root@server ~]# mkdir docker-compose
[root@server ~]# vi docker-compose/docker-compose.yml 
version: "2"（docker-compose版本）
services: 
    nginx: （容器名字）
      image: nginx:latest （镜像名字）
      ports: 
       - "8181:80"
    centos_http:
      build: .
      ports:
       - "9191:80"
      tty: true（打开虚拟终端，防止容器退出）
    tomcat:
      image: tomcat:latest
      ports:
       - "9292:8080"

要构建centos_http镜像,所以编写dockerfile:

[root@server ~]# cat docker-compose/dockerfile 
FROM 192.168.200.104:5000/centos:latest
MAINTAINER xiandian
RUN rm -rf /etc/yum.repos.d/*
ADD docker.repo /etc/yum.repos.d/
RUN yum -y install httpd
EXPOSE 80
别忘了yum源:
[root@server ~]# cat docker-compose/docker.repo 
[centos]
name=centos
baseurl=ftp://192.168.100.10/centos
gpgcheck=0
enabled=1

构建镜像：
（如果容器组里有构建镜像的容器，要先建立镜像）

[root@server docker-compose]# docker-compose build
nginx uses an image, skipping
Building centos_http
Step 1 : FROM 192.168.200.104:5000/centos:latest
 ---> ff426288ea90
Step 2 : MAINTAINER xiandian
 ---> Running in fdc344559cc1
 ---> 776f32702ee7
Removing intermediate container fdc344559cc1
Step 3 : RUN rm -rf /etc/yum.repos.d/*
 ---> Running in 8ada479b623c
 ---> 654ff7146b04
......
Step 6 : EXPOSE 80
 ---> Running in 9995addd821b
 ---> d167d0ceb1c9
Removing intermediate container 9995addd821b
Successfully built d167d0ceb1c9
tomcat uses an image, skipping

运行容器组：

[root@server docker-compose]# docker-compose up
Creating dockercompose_nginx_1
Creating dockercompose_centos_http_1
Creating dockercompose_tomcat_1
Attaching to dockercompose_nginx_1, dockercompose_centos_http_1, dockercompose_tomcat_1...

验证时我打开了另一个终端（因为docker-compose up霸占了当前终端）：

[root@server docker-compose]# docker-compose ps
      Name               Command              State               Ports       
-----------------------------------------------------------------------------
dockercompose_cen   /bin/bash           Up                  0.0.0.0:9191->80/ 
tos_http_1                                                  tcp               
dockercompose_ngi   nginx -g daemon     Up                  0.0.0.0:8181->80/ 
nx_1                off;                                    tcp               
dockercompose_tom   catalina.sh run     Up                  0.0.0.0:9292->808 
cat_1                                                       0/tcp             

接下来要配置nginx容器的配置文件和启动http容器tomcat容器内的web服务，完成后就ok啦。