生产案例：构建haproxy镜像
准备相关文件
#准备haproxy源码文件
[root@ubuntu1804 ~]#mkdir -p /data/dockerfile/web/haproxy/2.1.2-centos7
[root@ubuntu1804 ~]#cd /data/dockerfile/web/haproxy/2.1.2-centos7
[root@ubuntu1804 2.1.2-centos7]#wget http://www.haproxy.org/download/2.1/src/haproxy-2.1.2.tar.gz
#准备haproxy启动脚本
[root@ubuntu1804 2.1.2-centos7]#vim run_haproxy.sh
[root@ubuntu1804 2.1.2-centos7]#cat run_haproxy.sh
#!/bin/bash
haproxy -f /etc/haproxy/haproxy.cfg
tail -f /etc/hosts
准备haproxy配置文件
#准备haproxy配置文件
[root@ubuntu1804 2.1.2-centos7]#cat haproxy.cfg
global
chroot /apps/haproxy
#stats socket /var/lib/haproxy/haproxy.sock mode 600 level admin
uid 99
gid 99
daemon
nbproc 1
pidfile /apps/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:123456
listen web_port
bind 0.0.0.0:80
mode http
log global
balance roundrobin
server web1 10.0.0.101:8080 check inter 3000 fall 2 rise 5
server web2 10.0.0.102:8080 check inter 3000 fall 2 rise 5 准备Dockerfile
[root@ubuntu1804 2.1.2-centos7]#pwd
/data/dockerfile/web/haproxy/2.1.2-centos7
[root@ubuntu1804 haproxy]# cat Dockerfile
#Haproxy Base Image
FROM centos7-base:v1
LABEL maintainer="wangxiaochun <root@wangxiaochun.com>"
ADD haproxy-2.1.2.tar.gz /usr/local/src/
RUN cd /usr/local/src/haproxy-2.1.2 \
&& make ARCH=x86_64 TARGET=linux-glibc USE_PCRE=1 USE_OPENSSL=1 USE_ZLIB=1 USE_SYSTEMD=1 USE_CPU_AFFINITY=1 PREFIX=/apps/haproxy \
&& make install PREFIX=/apps/haproxy \
&& ln -s /apps/haproxy/sbin/haproxy /usr/sbin/ \
&& mkdir /apps/haproxy/run \
&& rm -rf /usr/local/src/haproxy*
ADD haproxy.cfg /etc/haproxy/
ADD run_haproxy.sh /usr/bin
EXPOSE 80 9999
CMD ["run_haproxy.sh"]准备构建脚本构建haproxy镜像
[root@ubuntu1804 2.1.2-centos7]#vim build.sh
[root@ubuntu1804 2.1.2-centos7]#cat build.sh
#!/bin/bash
docker build -t haproxy-centos7:2.1.2 .
[root@ubuntu1804 2.1.2-centos7]#ls
build.sh Dockerfile haproxy-2.1.2.tar.gz haproxy.cfg run_haproxy.sh
[root@ubuntu1804 2.1.2-centos7]#bash build.sh
[root@ubuntu1804 2.1.2-centos7]#docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
haproxy-centos7 2.1.2 5eccdb29a058 26 minutes ago 428MB
nginx-ubuntu1804 1.16.1 19efdd23ac87 15 hours ago 378MB
alpine-nginx 1.16.1 978a43bbb61d 16 hours ago 211MB
nginx-alpine 1.16.1 978a43bbb61d 16 hours ago 211MB
alpine-base 3.11 b162eecf4da9 17 hours ago 182MB
tomcat-web app2 0e1760fe79a6 37 hours ago 838MB
tomcat-web app1 76016219a0ca 37 hours ago 838MB
tomcat-base v8.5.50 8d5395cb72c4 38 hours ago 824MB
centos7-jdk 8u212 e0fe770a7ccd 39 hours ago 809MB
centos7-base v1 34ab3afcd3b3 40 hours ago 403MB
alpine 3.11 e7d92cdc71fe 12 days ago 5.59MB
alpine latest e7d92cdc71fe 12 days ago 5.59MB
ubuntu 18.04 ccc6e87d482b 2 weeks ago 64.2MB
ubuntu bionic ccc6e87d482b 2 weeks ago 64.2MB
centos centos7.7.1908 08d05d1d5859 2 months ago 204MB
从镜像启动容器
[root@ubuntu1804 2.1.2-centos7]#docker run -d -p 80:80 -p 9999:9999 haproxy-centos7:2.1.2
e0a7c827cb5fdd5a630f7dfe58b1f60822da18929a4dfeccb7490fb78403e3df2.5.6 在另外两台主机启动容器
#导出本地相关镜像
[root@ubuntu1804 ~]#docker save centos7-base:v1 > /data/centos7-base.tar.gz
[root@ubuntu1804 ~]#docker save centos7-jdk:8u212 > /data/centos7-jdk.tar.gz
[root@ubuntu1804 ~]#docker save tomcat-base:v8.5.50 > /data/tomcat-base.tar.gz
[root@ubuntu1804 ~]#docker save tomcat-web:app1 > /data/tomcat-web-app1.tar.gz
[root@ubuntu1804 ~]#docker save tomcat-web:app2 > /data/tomcat-web-app2.tar.gz
[root@ubuntu1804 ~]#ls /data
centos7-base.tar.gz centos7-jdk.tar.gz dockerfile tomcat-base.tar.gz tomcat-web-app1.tar.gz tomcat-web-app2.tar.gz
#将镜像复制到另外两台主机
[root@ubuntu1804 ~]#scp /data/*.gz 10.0.0.101:/data/
[root@ubuntu1804 ~]#scp /data/*.gz 10.0.0.102:/data/
#在另外两台主机上执行下面操作导入镜像
[root@ubuntu1804 ~]#ls /data
centos7-base.tar.gz lost+found tomcat-web-app1.tar.gz
centos7-jdk.tar.gz tomcat-base.tar.gz tomcat-web-app2.tar.gz
[root@ubuntu1804 ~]#for i in /data/*.gz;do docker load -i $i;done
#在另外两台主机上创建相关容器
[root@ubuntu1804 ~]#docker run -d -p 8080:8080 tomcat-web:app1
781681e73333396b23f404e70d0c781ab464a8e9b578f41c153583d23bd76a46
[root@ubuntu1804 ~]#docker run -d -p 8080:8080 tomcat-web:app2
81fa01a688cb72cf397a5da46acc89a51f2a2f8de3a0072565d701625c43540a
web访问验证
[root@ubuntu1804 2.1.2-centos7]#curl http://10.0.0.100/app/
Tomcat Page in app1
[root@ubuntu1804 2.1.2-centos7]#curl http://10.0.0.100/app/
Tomcat Page in app2
[root@ubuntu1804 2.1.2-centos7]#docker exec -it e0a7c827cb5 bash
[root@e0a7c827cb5f /]# netstat -ntl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:9999 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
[root@e0a7c827cb5f /]# vim /etc/haproxy/haproxy.cfg
[root@e0a7c827cb5f /]# ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.2 11700 2428 ? Ss 11:01 0:00 /bin/bash /usr/bin/run_haproxy.sh
nobody 7 0.0 7.1 181076 70324 ? Ss 11:01 0:00 haproxy -f /etc/haproxy/haproxy.cfg
root 8 0.0 0.0 4416 772 ? S 11:01 0:00 tail -f /etc/hosts
root 9 0.1 0.3 12488 3696 pts/0 Ss 11:02 0:00 bash
root 54 0.0 0.3 51764 3448 pts/0 R+ 11:06 0:00 ps aux
#在第二台主机上停止容器
[root@ubuntu1804 ~]#docker stop 81fa01a688cb
[root@ubuntu1804 ~]#docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
81fa01a688cb tomcat-web:app2 "/apps/tomcat/bin/ru…" 28 minutes ago Exited (137) 39 seconds ago
#观察状态页，发现后端服务器down
#在第二台主机上恢复启动容器
[root@ubuntu1804 ~]#docker start 81fa01a688cb
81fa01a688cb
[root@ubuntu1804 ~]#docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
81fa01a688cb tomcat-web:app2 "/apps/tomcat/bin/ru…" 30 minutes ago Up 14 seconds 8009/tcp, 0.0.0.0:8080->8080/tcp optimistic_shirley
#再次观察状态页，发现后端服务器上线
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