1、需求：

使用haproxy代理两个服务（web服务或者是mysql服务）

2、编写Dockerfile

2.1、创建Dockerfile专用目录

mkdir /docker/images/haproxy -p && cd /docker/images/haproxy

2.2、下载软件包到Dockerfile专用目录

curl -O https://www.haproxy.org/download/2.4/src/haproxy-2.4.2.tar.gz

或者下载这个 https://download.csdn.net/download/cyw8998/89069508

2.3、定制配置文件haproxy.cfg

cat << 'CAT_END' > haproxy.cfg
globalchroot /usr/local/haproxy/maxconn 4096uid 99gid 99daemonnbproc 1pidfile /usr/local/haproxy/haproxy.pidlog 127.0.0.1 local3 info
defaultslog globalmode   httpoption http-keep-aliveoption forwardforretries 3maxconn 4096timeout connect 120stimeout client 120stimeout server 120slisten statusbind 0.0.0.0:9999mode httplog globalstats enablestats uri /haproxy-statsstats auth haadmin:123456
listen web_portbind 0.0.0.0:80mode httplog globalbalance roundrobinserver web1 192.168.0.9:8090 check inter 2000 fall 3 rise 5server web2 192.168.0.9:8090/Zm check inter 2000 fall 3 rise 5
listen mysql-clusterbind 0.0.0.0:3306mode tcpbalance roundrobinoption mysql-checkserver mysql1 192.168.0.9:13306 check weight 2 inter 2000 rise 2 fall 5server mysql2 192.168.0.9:13307 check weight 2 inter 2000 rise 2 fall 5
CAT_END

2.4、编写haproxy运行脚本

cat << 'CAT_END' > entrypoint.sh
!/bin/bash
/usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg
tail -f /etc/hosts
CAT_END

2.5、定制Dockerfile

cat << 'CAT_END' > Dockerfile
FROM ubuntu:latest
MAINTAINER cyc authorADD haproxy-2.4.2.tar.gz /usr/local/srcRUN apt-get update && apt install make gcc build-essential libssl-dev zlib1g-dev libpcre3 libpcre3-dev libsystemd-dev libreadline-dev -y && \
cd /usr/local/src/haproxy-2.4.2 && \
make ARCH=x86_64 TARGET=linux-glibc USE_PCRE=1 USE_OPENSSL=1 USE_ZLIB=1 USE_SYSTEMD=1 USE_CPU_AFFINITY=1 \
PREFIX=/usr/local/haproxy-2.4.2 && make install PREFIX=/usr/local/haproxy-2.4.2 && \
ln -s /usr/local/haproxy-2.4.2 /usr/local/haproxy && rm -rf /usr/local/src/haproxy* && \
apt-get autoclean && apt-get clean && apt-get autoremoveADD haproxy.cfg /etc/haproxy/haproxy.cfg
ADD entrypoint.sh /root/entrypoint.shEXPOSE 80 3306 9999CMD ["bash","/root/entrypoint.sh"]
CAT_END

2.6、构建镜像

docker build -t haproxy:v2.4.2 .

3.1、启动容器

docker run -d -p 13301:3306 -p 9999:9999 haproxy:v2.4.2