通过docker-composer启动容器nginx，并完成spring.boot的web站点端口转发

前面已经讲过2篇基于docker的mysql、redis容器编排并启动。这次将练习下nginx的docker方式的部署，以及通过nginx去代理宿主主机上的Web服务应该怎么配

PS:（这里由于nginx是容器上运行，然后web服务是运行在linux上，所以有区别）

准备环境：

docker 18.06.1-ce

docker-compose 1.23.0-rc3

nginx镜像

spring.boot的web项目 demo-0.0.1-SNAPSHOT.jar（越简单越好，这里主要用于测试）

开始：

新建目录/usr/iqeq/nginx，目录结构如下

------[ nginx ]
------docker-compose.yml
------demo-0.0.1-SNAPSHOT.jar
------start.sh
------stop.sh
------------------------------[ conf ]
---------------------------------------nginx.conf
------------------------------[ data ]
------------------------------[ log ]

1、我们先把编写sh脚本，用于启动、停止spring.boot项目。

start.sh

#!/bin/bash

SERVER_NAME='demo'
# jar名称
JAR_NAME='demo-0.0.1-SNAPSHOT.jar'
cd `dirname $0`
BIN_DIR=`pwd`
SERVER_PORT=8080

PIDS=`ps -ef | grep java | grep "$JAR_NAME" |awk '{print $2}'`
if [ "$1" = "status" ]; then
    if [ -n "$PIDS" ]; then
        echo "The $SERVER_NAME is running...!"
        echo "PID: $PIDS"
        exit 0
    else
        echo "The $SERVER_NAME is stopped"
        exit 0
    fi
fi

if [ -n "$PIDS" ]; then
    echo "ERROR: The $SERVER_NAME already started!"
    echo "PID: $PIDS"
    exit 1
fi

if [ -n "$SERVER_PORT" ]; then
    SERVER_PORT_COUNT=`netstat -tln | grep $SERVER_PORT | wc -l`
    if [ $SERVER_PORT_COUNT -gt 0 ]; then
        echo "ERROR: The $SERVER_NAME port $SERVER_PORT already used!"
        exit 1
    fi
fi

echo -e "Starting the $SERVER_NAME ..."

STDOUT_FILE=$BIN_DIR/stdout.log
nohup java -jar $BIN_DIR/$JAR_NAME > $STDOUT_FILE 2>&1 &
COUNT=0
while [ $COUNT -lt 1 ]; do
    echo -e ".\c"
    sleep 1
    if [ -n "$SERVER_PORT" ]; then
        COUNT=`netstat -an | grep $SERVER_PORT | wc -l`
    else
        COUNT=`ps -f | grep java | grep "$BIN_DIR" | awk '{print $2}' | wc -l`
    fi
    if [ $COUNT -gt 0 ]; then
        break
    fi
done


echo "OK!"

stop.sh

#!/bin/bash

SERVER_NAME='demo'
# jar名称
JAR_NAME='demo-0.0.1-SNAPSHOT.jar'
cd `dirname $0`
SERVER_PORT=8080

PIDS=`ps -ef | grep java | grep "$JAR_NAME" |awk '{print $2}'`
if [ -z "$PIDS" ]; then
    echo "ERROR: The $SERVER_NAME does not started!"
    exit 1
fi

echo -e "Stopping the $SERVER_NAME ...\c"
for PID in $PIDS ; do
    kill $PID > /dev/null 2>&1
done

COUNT=0
while [ $COUNT -lt 1 ]; do
    echo -e ".\c"
    sleep 1
    COUNT=1
    for PID in $PIDS ; do
        PID_EXIST=`ps -f -p $PID | grep java`
        if [ -n "$PID_EXIST" ]; then
            COUNT=0
            break
        fi
    done
done

echo "OK!"
echo "PID: $PIDS"

2、然后我们把测试的web服务启动起来

这个spring.boot项目很简单，打印一行字符串。

说明web已经起来了。。到这步为止，我们可以看到端口暴露的是8080，没关系，我们下面几个步骤准备来用nginx做代理，转到80端口。

3、编写compose文件

version: '3'

services:
   
  nginx:
    container_name: nginx_container
    image: nginx
    ports:
      - "80:80"
    restart: unless-stopped
    volumes:
      - $PWD/nginx/conf/nginx.conf:/etc/nginx/nginx.conf           
      - $PWD/nginx/logs/:/var/log/nginx/
      - $PWD/nginx/data/:/var/share/nginx/html/

在/usr/iqeq/nginx/conf下面新建的那个一个文件：nginx.conf，改下配置如下。

worker_processes  1;

events {
    use epoll;
    worker_connections  10240;
}

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

    gzip on;                             #开启压缩
    gzip_min_length 1000;                #小于1000KB文件不压缩
    gzip_comp_level 4;                   #压缩比率   
    gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
    
    sendfile        on;
    
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  demo_web;
        
        if ($request_method !~ ^(GET|POST)$ ) {
            return 444;
        }
        
        location / {
            proxy_pass http://172.18.0.1:8080/;   #??????
            proxy_set_header Host $http_host;                    
            proxy_set_header X-Real-IP $remote_addr;                    
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
        }
        
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

    }

}