docker-compose

docker-compose

docker单独只能run一次创建一个容器，而docker-compose可以对多个容器进行编排。
这里我用docker-compose用haproxy做负载均衡，一键配置多个容器
先导入需要的镜像.haproxy，nginx，apache

因为apche,nginx,的镜像我这里前面导入过了
所以,我这只导了haproxy
[root@foundation3 ~]# docker load -i haproxy.tar 
917c0fc99b35: Loading layer 130.9 MB/130.9 MB
5f70bf18a086: Loading layer 1.024 kB/1.024 kB
c205bb11f213: Loading layer 4.684 MB/4.684 MB
ffef890bdf7b: Loading layer 9.549 MB/9.549 MB
3ec368642ee3: Loading layer 2.048 kB/2.048 kB
Loaded image: haproxy:latest

在/tmp/docker目录下建立compose目录，并编写.yml文件

[root@foundation3 .docker]# cd /tmp/docker/
[root@foundation3 docker]# ls
auth  certs  Dockerfile  dvd.repo  ssh  supervisord.conf  test  web
[root@foundation3 docker]# mkdir compose
[root@foundation3 docker]# cd compose/
[root@foundation3 compose]# ls
[root@foundation3 compose]# pwd
/tmp/docker/compose
[root@foundation3 compose]# vim docker-compose.yml

docker-compose.yml 文件内容为：

apache:
    image: rhel7:v1
    expose:
        - 80
    volumes:
        - ./web:/var/www/html

nginx:
    image: nginx
    expose:
        - 80

haproxy:
    image: haproxy
    volumes:
        - ./haproxy:/usr/local/etc/haproxy
    links:
        - apache
        - nginx
    ports:
        - "8080:80"
    expose:
        - 80

编辑haproxy的配置文件，指定web1和web2实现apache和nginx负载均衡

[root@foundation3 compose]# cd ..
[root@foundation3 docker]# cp -r web/  compose/
###为了看到之前写好的apache页面,直接将之前的web拷贝到compose目录里
[root@foundation3 docker]# cd compose/
[root@foundation3 compose]# ls
docker-compose.yml  web
[root@foundation3 compose]# mkdir haproxy
[root@foundation3 compose]# cd haproxy/
[root@foundation3 haproxy]# ls
[root@foundation3 haproxy]# vim haproxy.cfg

haproxy.cfg文件内容：

global
    log 127.0.0.1 local0
    log 127.0.0.1 local1 notice
defaults
    log global
    mode http
    option httplog
    option dontlognull
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
    stats uri /status
frontend balancer
    bind 0.0.0.0:80
    default_backend web_backends
backend web_backends
    balance roundrobin
    server web1 apache:80 check
    server web2 nginx:80 check

在网上下载docker-compose-Linux-x86_64-1.22.0
将其放在/usr/local/bin下,不然没有docker-compose命令

[root@foundation3 compose]# cd /usr/local/bin/
[root@foundation3 bin]# chmod  +x docker-compose-Linux-x86_64-1.22.0 
[root@foundation3 bin]# ln -s docker-compose-Linux-x86_64-1.22.0 docker-compose

以上完成后,就可以启用了

##up推送,crtl+c退出
[root@foundation3 compose]# docker-compose up
Starting compose_apache_1 ... done
Starting compose_nginx_1  ... done
Starting compose_haproxy_1 ... done
Attaching to compose_apache_1, compose_nginx_1, compose_haproxy_1
apache_1   | AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
haproxy_1  | <7>haproxy-systemd-wrapper: executing /usr/local/sbin/haproxy -p /run/haproxy.pid -f /usr/local/etc/haproxy/haproxy.cfg -Ds 
^CGracefully stopping... (press Ctrl+C again to force)
Stopping compose_haproxy_1 ... done
Stopping compose_apache_1  ... done
Stopping compose_nginx_1   ... done

在网页测试会实现论询：


查看状态监控：

###crtl + c退出后
[root@foundation3 compose]# docker-compose start  ###直接打开
Starting apache  ... done
Starting nginx   ... done
Starting haproxy ... done
[root@foundation3 compose]# docker ps -a  ##查看容器情况
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
33595ac4a76e        haproxy             "/docker-entrypoin..."   9 minutes ago       Up 16 seconds       0.0.0.0:8080->80/tcp   compose_haproxy_1
fbe24843f3c4        rhel7:v1            "/usr/sbin/httpd -..."   9 minutes ago       Up 17 seconds       80/tcp                 compose_apache_1
96f4c5491008        nginx               "nginx -g 'daemon ..."   9 minutes ago       Up 17 seconds       80/tcp                 compose_nginx_1
[root@foundation3 compose]# docker stop compose_apache_1
compose_apache_1
####关闭apache

当apache被关闭后,查看监控状态,会显示down,当然论询也会失败