とりあえず使ってみる

環境

CentOS7

CentOS6だと色々制限あったりちょっと面倒になってきたのでCentOS7でやってみます

dockerのインストール

yum install docker
$ docker version
Client:
 Version:         1.9.1
 API version:     1.21
 Package version: docker-common-1.9.1-40.el7.centos.x86_64
 Go version:      go1.4.2
 Git commit:      ab77bde/1.9.1
 Built:
 OS/Arch:         linux/amd64
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

docker-composeのインストール

docs.docker.com

curl -L https://github.com/docker/compose/releases/download/1.7.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
$ docker-compose --version
docker-compose version 1.7.1, build 0a9ab35

ためしに何か書いてみる

構成

backend2台
nginx

設定

docker-compose.yml

web1:
  build: ./web
web2:
  build: ./web

nginx:
  build: ./nginx
  links:
    - web1
    - web2
  ports:
    - "80:80"
    - "443:443"

web/Dockerfile

FROM centos:centos6

EXPOSE 8080

CMD python -m SimpleHTTPServer 8080

nginx/Dockerfile

FROM nginx
MAINTAINER swfz sawafuji.09@gmail.com

COPY ["./nginx.conf", "/etc/nginx/nginx.conf"]

CMD ["/usr/sbin/nginx", "-g", "daemon off;"]

nginx/nginx.conf

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    open_file_cache max=100 inactive=5s;
    upstream backend {
        least_conn;
        server web1:8080;
        server web2:8080;
    }

    include /etc/nginx/conf.d/*.conf;
    server {
        listen       80 default_server;

        location /nginx_status {
            stub_status on;
            access_log off;
            allow 127.0.0.1;
            deny all;
        }
        location / {
            proxy_pass http://backend;
        }
    }
}

起動

docker-compose up -d

リバプロの確認

$ docker ps
....
....
$ docker logs -f 741f7cee73bd(backend側)
172.17.0.4 - - [21/Jun/2016 14:36:32] "GET / HTTP/1.0" 200 -
172.17.0.4 - - [21/Jun/2016 14:36:34] "GET / HTTP/1.0" 200 -

curlでnginxのコンテナへ何度かアクセスし、均等にアクセスがいったことを確認