CenOS 7.1安装Docker、Docker-compose

天天酷派哦

关闭centos7自带的firewall防火墙关闭firewall

systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动

安装iptables防火墙

yum install iptables-services #安装
systemctl restart iptables.service #最后重启防火墙使配置生效
systemctl enable iptables.service #设置防火墙开机启动

安装docker

yum install docker-io

docker-compose template文件:docker-compose.yml

1. #简单的web服务器，可以用 docker-compose scale web=n命令扩展到n个实例
   
2. web:
   
3.   image: yeasy/simple-web:latest
   
4.   environment:
   
5.     SERVICE_80_NAME: http
   
6.     SERVICE_NAME: web
   
7.     SERVICE_TAGS: backend
   
8.   ports:
   
9.   - "80"
   
10. #ngnix负载均衡，使用consul-template自动加载配置
    
11. lb:
    
12.   image: yeasy/nginx-consul-template:latest
    
13.   hostname: lb
    
14.   links:
    
15.   - consulserver:consul
    
16.   ports:
    
17.   - "80:80"
    
18. #consul服务端，可以方便管理docker container
    
19. consulserver:
    
20.   image: gliderlabs/consul-server:latest
    
21.   hostname: consulserver
    
22.   ports:
    
23.   - "8300"
    
24.   - "8400"
    
25.   - "8500:8500"
    
26.   - "53"
    
27.   command: -data-dir /tmp/consul -bootstrap -client 0.0.0.0
    
28. #监听本地的docker sock，并将web服务器的container注册到consul服务端
    
29. #listen on local docker sock to register the container with public ports to the consul service
    
30. registrator:
    
31.   image: gliderlabs/registrator:master
    
32.   hostname: registrator
    
33.   links:
    
34.   - consulserver:consul
    
35.   volumes:
    
36.   - "/var/run/docker.sock:/tmp/docker.sock"
    
37.   command: -internal consul://consul:8500

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使用docker-compose启动

docker-compose up #在docker-compose.yml所在的目录下
日志实例：

1. #consulserver_1是consul的服务端日志
   
2. #lb_1是ngnix的日志
   
3. [root@localhost docker-compose]# docker-compose up
   
4. Recreating dockercompose_web_1...
   
5. Recreating dockercompose_consulserver_1...
   
6. Recreating dockercompose_lb_1...
   
7. Recreating dockercompose_registrator_1...
   
8. Attaching to dockercompose_web_1, dockercompose_consulserver_1, dockercompose_lb_1
   
9. consulserver_1 | ==> Failed to check for updates: Get https://checkpoint-api.hashicorp.com/v1/check/consul?arch=amd64&os=linux&signature=990d4634-bb34-ccad-b5fb-b1a4bfd1f4e9&version=0.6.3: dial tcp: lookup checkpoint-api.hashicorp.com on 202.96.128.86:53: read udp 172.17.0.2:36822->202.96.128.86:53: i/o timeout
   
10. lb_1           | 2016/04/19 05:20:56 [error] 18#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.17.116, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:65535/", host: "192.168.17.160"
    
11. lb_1           | 192.168.17.116 - - [19/Apr/2016:05:20:56 +0000] "GET / HTTP/1.1" 502 575 "-" "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36" "-"

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web容器扩容

docker-compose scale web=3#扩展到3个实例

1. [root@localhost docker-compose]# docker-compose scale web=3
   
2. Creating dockercompose_web_2...
   
3. Creating dockercompose_web_3...
   
4. Starting dockercompose_web_2...
   
5. Starting dockercompose_web_3...

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连接docker container（借助nsenter）

1. [root@localhost ~]# docker inspect --format "{{.State.Pid}}" dockercompose_web_1
   
2. 3488
   
3. [root@localhost ~]# nsenter --target 3488 --mount --ipc --uts --net --pid
   
4. root@0b1e4a76e802:/# ps      
   
5.   PID TTY          TIME CMD
   
6.    59 ?        00: 00:00 bash
   
7.    63 ?        00: 00:00 ps
   
8. root@0b1e4a76e802:/#

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