docker下nginx反向代理和负载均衡配置

拉取镜像

docker pull nginx
docker pull tomcat

启动docker

docker run --name=my_nginx -p 8000:80 -d nginx
--name: 为nginx容器指定一个名称方便管理
-p: 将nginx内部80端口代理到宿主机8000端口,可以通过宿主机:8000访问nginx 80端口
-d: 后台运行

查看容器运行情况

docker ps 
CONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS              PORTS                  NAMES
3694b7d63cab        nginx                  "nginx -g 'daemon of…"   2 minutes ago       Up 2 minutes        0.0.0.0:8000->80/tcp   my_nginx

访问nginx

http://node3.liudehan.com:8000/ 

进入容器后台

docker exec -it my_nginx bash
root@3694b7d63cab:/etc/nginx# ls -l
total 40
drwxr-xr-x 2 root root 4096 May  8 03:01 conf.d
-rw-r--r-- 1 root root 1007 Apr 16 13:08 fastcgi_params
-rw-r--r-- 1 root root 2837 Apr 16 13:08 koi-utf
-rw-r--r-- 1 root root 2223 Apr 16 13:08 koi-win
-rw-r--r-- 1 root root 5231 Apr 16 13:08 mime.types
lrwxrwxrwx 1 root root   22 Apr 16 13:08 modules -> /usr/lib/nginx/modules
-rw-r--r-- 1 root root  643 Apr 16 13:08 nginx.conf
-rw-r--r-- 1 root root  636 Apr 16 13:08 scgi_params
-rw-r--r-- 1 root root  664 Apr 16 13:08 uwsgi_params
-rw-r--r-- 1 root root 3610 Apr 16 13:08 win-utf

nginx.conf是nginx主要配置文件,可以通过more命令查看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;

    include /etc/nginx/conf.d/*.conf;
}

include /etc/nginx/conf.d/*.conf;

导入配置文件如下

root@3694b7d63cab:/etc/nginx/conf.d# cat default.conf
server {
    listen       80;
    server_name  localhost;
    #charset koi8-r;
    #access_log  /var/log/nginx/host.access.log  main;
    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }
    #error_page  404              /404.html;
    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}
    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}
    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

nginx配置文件挂载

创建文件和目录

mkdir -p  u01/nginx
mkdir -p u01/nginx/conf.d
touch u01/nginx/nginx.conf
touch u01/nginx/conf.d/default.conf

删除镜像，重新挂载

docker stop my_nginx
docker rm my_nginx
docker run --name=my_nginx -v /Users/liudehan/u01/nginx/nginx.conf:/etc/nginx/nginx.conf -v /Users/liudehan/u01/nginx/conf.d:/etc/nginx/conf.d -p 80:80 -d nginx

更改配置加载web应用

docker stop my_nginx
docker rm my_nginx
docker run --name=my_nginx -v /Users/liudehan/u01/nginx/nginx.conf:/etc/nginx/nginx.conf -v /Users/liudehan/u01/nginx/conf.d:/etc/nginx/conf.d  -v /Users/liudehan/u01/nginx/www/dist-H5:/usr/share/nginx/html/dist-H5 -p 80:80 -d nginx

创建Tomcat应用

应用1
docker run --name=my_tomcat1 -v/Users/liudehan/u01/webapps:/usr/local/tomcat/webapps -p 8001:8080 -d tomcat
应用2
docker run --name=my_tomcat2 -v/Users/liudehan/u01/webapps:/usr/local/tomcat/webapps -p 8002:8080 -d tomcat

显示如下： my_tomcat1 my_tomcat2 

nginx实现反向代理和负载均衡

nginx配置如下

default.conf

location / {
    proxy_pass   http://tomcat_server;

nginx.conf配置如下

http里面
upstream tomcat {   //这不能为tomcat_server这样的，这是域名
      server t1:8080;
    }

配置docker如下

docker run --name=my_nginx --link=my_tomcat1:t1 --link=my_tomcat2:t2 -v /Users/liudehan/u01/nginx/nginx.conf:/etc/nginx/nginx.conf -v /Users/liudehan/u01/nginx/conf.d:/etc/nginx/conf.d  -p 80:80 -d nginx

显示如下：