制作 haproxy 镜像：

1. 进入目录

mkdir -pv /opt/dockerfile/app/haproxy
cd /opt/dockerfile/app/haproxy

2. 准备 Dockerfile：

vim Dockerfile

#Haproxy Base Image
FROM centos
ADD haproxy-2.0.5.tar.gz /usr/local/src/

RUN yum install gcc gcc-c++ glibc glibc-devel pcre \
                pcre-devel openssl openssl-devel systemd-devel \
                net-tools vim iotop bc zip unzip zlib-devel lrzsz \
                tree screen lsof tcpdump wget ntpdate –y \
      && cd /usr/local/src/haproxy-2.0.5 \
      && 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 \
      && make install PREFIX=/usr/local/haproxy \
      && cp haproxy /usr/sbin/ \
      && mkdir /usr/local/haproxy/run
ADD haproxy.cfg /etc/haproxy/
ADD run_haproxy.sh /usr/bin
RUN chmod +x /usr/bin/run_haproxy.sh
EXPOSE 80 9999
CMD ["/usr/bin/run_haproxy.sh"]

3. 准备 haproxy 源码文件:haproxy-2.0.5.tar.gz

4. 准备run_haproxy.sh脚本

vim run_haproxy.sh

#!/bin/bash
haproxy -f /etc/haproxy/haproxy.cfg
tail -f /etc/hosts

5. 准备 haproxy 配置文件：

vim haproxy.cfg

global
chroot /usr/local/haproxy
#stats socket /var/lib/haproxy/haproxy.sock mode 600 level admin
uid 99
gid 99
daemon
nbproc 1
pidfile /usr/local/haproxy/run/haproxy.pid
log 127.0.0.1 local3 info

defaults
option http-keep-alive
option forwardfor
mode http
timeout connect 300000ms
timeout client 300000ms
timeout server 300000ms

listen stats
mode http
bind 0.0.0.0:9999
stats enable
log global
stats uri /haproxy-status
stats auth haadmin:q1w2e3r4ys

listen web_port
bind 0.0.0.0:80
mode http
log global
balance roundrobin
server web1 192.168.99.21:8888 check inter 3000 fall 2 rise 5
server web2 192.168.99.22:8889 check inter 3000 fall 2 rise 5

5. 准备构建脚本：

docker build -t haproxy:v1 .

6. 从镜像启动容器：

docker run -it -d -p 80:80 -p 9999:9999 haproxy:v1

7. web 访问验证
   

8. 访问tomcat业务app1