架构说明：docker结合haproxy、tomcat、redis实现session共享
环境：
宿主机系统：centos7
软件版本：
docker-19.03.12
jdk1.8.0_261
tomcat-8.5.57
redis-5.0.5
说明：以下操作都是基于centos7的基础docker镜像去完成
实现架构图
dockerfile制作centos基础镜像
#目录结构
#centos
[root@localhost system]# tree centos/
centos/
├── build-command.sh
├── CentOS-Base.repo
└── Dockerfile
0 directories, 3 files
#CentOS-Base.repo镜像仓库地址为阿里云镜像下载
#dockerfile文件编写,创建多个用户已备后期制作业务镜像使用
#下载镜像版本请指定特定版本，如果指定latest后期镜像更新会覆盖原来的镜像
[root@localhost centos]# cat Dockerfile
#!/bin/bash
#centos-base:7.8.2003
From centos:7.8.2003
LABEL chenjianhong [email protected]
RUN rm -f /etc/yum.repos.d/*
ADD CentOS-Base.repo /etc/yum.repos.d/
RUN yum -y install vim wget tree lrzsz gcc gcc-c++ automake pcre pcre-devel zlib zlib-devel openssl openssl-devel unzip iproute net-tools iotop && groupadd -g 2001 www && useradd www -u 2001 -g www && groupadd -g 2002 nginx && useradd nginx -u 2002 -g nginx
#主要辨别标识和管理，因为镜像一多自己可能都不会记得
[root@localhost centos]# cat build-command.sh
#!/bin/bash
docker build -t centos-base:7.8.2003 .
#执行构建，可以看见构建成功
[root@localhost centos]# bash build-command.sh
Sending build context to Docker daemon 10.38MB
Step 1/4 : FROM centos-base/jdk-1.8.0:v1
---> 755618c0c19d
Step 2/4 : LABEL chenjianhong [email protected]
---> Using cache
---> 29be464df83a
Step 3/4 : ADD apache-tomcat-8.5.57.tar.gz /app
---> Using cache
---> be0333a228b9
Step 4/4 : RUN ln -sv /app/apache-tomcat-8.5.57 /app/tomcat
---> Using cache
---> 0a6136ecde6d
Successfully built 0a6136ecde6d
Successfully tagged centos-base/tomcat:8.5.57
可以看到centos环境的基础镜像制作完成
dockerfile制作jdk镜像
#因为镜像是分层的，所以我们制作镜像是按照基础镜像和业务镜像去区分构建，方便以后管理
#制作jdk镜像
[root@localhost ~]# cd /data/dockerfile/web/jdk
[root@localhost jdk]# pwd
/data/dockerfile/web/jdk
#查看jdk目录树
[root@localhost web]# tree jdk/
jdk/
└── centos
├── build-command.sh
├── Dockerfile
├── jdk-8u261-linux-x64.tar.gz
└── profile
1 directory, 4 files
#编写Dockerfile文件
#提前准备好jdk软件包
[root@localhost centos]# cat Dockerfile
#!/bin/bash
FROM centos-base:7.8.2003
LABEL chenjianhong [email protected]
ADD jdk-8u261-linux-x64.tar.gz /usr/local/src/
RUN ln -sv /usr/local/src/jdk1.8.0_261 /usr/local/jdk
ADD profile /etc/profile
#设置jdk环境
ENV JAVA_HOME /usr/local/jdk
ENV JRE_HOME $JAVA_HOME/jre
ENV CLASSPATH $JAVA_HOME/lib/:$JRE_HOME/lib/
ENV PATH $PATH:$JAVA_HOME/bin
#设置时区
RUN rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone
#编写profile
export JAVA_HOME=/usr/local/jdk
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
#编写build-command.sh
[root@localhost centos]# cat build-command.sh
#!/bin/bash
docker build -t centos-base/jdk-1.8.0:v1 .
#构建jdk环境的dockerfile
[root@localhost centos]# bash build-command.sh
Sending build context to Docker daemon 143.1MB
Step 1/10 : FROM centos-base:7.8.2003
---> df9d37a83b7a
Step 2/10 : LABEL chenjianhong [email protected]
---> Using cache
---> 6b9645dc1b05
Step 3/10 : ADD jdk-8u261-linux-x64.tar.gz /usr/local/src/
---> Using cache
---> 087df086c9f3
Step 4/10 : RUN ln -sv /usr/local/src/jdk1.8.0_261 /usr/local/jdk
---> Using cache
---> daf71407fa44
Step 5/10 : ADD profile /etc/profile
---> Using cache
---> c0e7394ac83c
Step 6/10 : ENV JAVA_HOME /usr/local/jdk
---> Using cache
---> 640e51cbd53d
Step 7/10 : ENV JRE_HOME $JAVA_HOME/jre
---> Using cache
---> 29c398041dd3
Step 8/10 : ENV CLASSPATH $JAVA_HOME/lib/:$JRE_HOME/lib/
---> Using cache
---> d59f7a7b5878
Step 9/10 : ENV PATH $PATH:$JAVA_HOME/bin
---> Using cache
---> acfbd6c8c486
Step 10/10 : RUN rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone
---> Using cache
---> 755618c0c19d
Successfully built 755618c0c19d
Successfully tagged centos-base/jdk-1.8.0:v1
#运行jdk容器，可以看到正常
[root@localhost centos]# docker run -it --rm centos-base/jdk-1.8.0:v1 bash
#时间正常
[root@a795db598736 /]# date
Tue Jul 28 09:16:21 CST 2020
#jdk正常
[root@a795db598736 /]# java -version
java version "1.8.0_261"
Java(TM) SE Runtime Environment (build 1.8.0_261-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.261-b12, mixed mode)
这边看到jdk环境的镜像制作完成
dockerfile制作tomcat镜像
#tomcat镜像目录结构
[root@localhost tomcat]# tree centos/
centos/
├── apache-tomcat-8.5.57.tar.gz
├── build-command.sh
└── Dockerfile
0 directories, 3 files
#编写dockerfile
[root@localhost centos]# cat Dockerfile
#!/bin/bash
FROM centos-base/jdk-1.8.0:v1
LABEL chenjianhong [email protected]
ADD apache-tomcat-8.5.57.tar.gz /app
RUN ln -sv /app/apache-tomcat-8.5.57 /app/tomcat
#编写构建脚本
[root@localhost centos]# cat build-command.sh
#!/bin/bash
docker build -t centos-base/tomcat:8.5.57 .
这样tomcat镜像就制作完成，启动镜像看看
可以看到正常
dockerfile制作redis镜像
说明：因为主要是实现session共享，所以我这边设置的是单机redis
# redis目录树
[root@localhost web]# tree redis/
redis/
├── build-command.sh
├── Dockerfile
├── redis-5.0.5.tar.gz
├── redis_6379.conf
└── run_redis.sh
0 directories, 5 files
#提前准备redis安装包
#准备好redis配置文件，设置redis密码
[root@localhost redis]# egrep -v "^#|^$" redis_6379.conf
bind 0.0.0.0
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
pidfile /app/redis/run/redis_6379.pid
loglevel notice
logfile "/app/redis/logs/redis_6379.log"
requirepass 123456
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
requirepass 123456
maxmemory 1G
dynamic-hz yes
#编写dockerfile文件
[root@localhost redis]# cat Dockerfile
#!/bin/bash
From centos-base:7.8.2003
LABEL chenjianhong [email protected]
ADD redis-5.0.5.tar.gz /usr/local/src/
RUN cd /usr/local/src/redis-5.0.5 && make PREFIX=/app/redis-5.0.5 MALLOC=libc install && \
mkdir -p /app/redis-5.0.5/{etc,data,logs,run}
ADD redis_6379.conf /app/redis-5.0.5/etc/
RUN ln -sf /app/redis-5.0.5 /app/redis && groupadd -g 2003 redis && useradd redis -g 2003 -u 2003 && \
chown -R redis.redis /app
ADD run_redis.sh /app/redis/bin/
EXPOSE 6379
CMD ["/app/redis/bin/run_redis.sh"]
#准备好redis启动脚本
#docker要有守护进程不然会退出
[root@localhost redis]# cat run_redis.sh
#!/bin/bash
/app/redis/bin/redis-server /app/redis/etc/redis_6379.conf
tail -f /etc/hosts
#编写构建脚本
[root@localhost redis]# cat build-command.sh
#!/bin/vbash
docker build -t centos-base/redis-5.0.5:v1 .
#执行构建，可以看到构建成功
[root@localhost redis]# bash build-command.sh
Sending build context to Docker daemon 2.043MB
Step 1/9 : From centos-base:7.8.2003
---> df9d37a83b7a
Step 2/9 : LABEL chenjianhong [email protected]
---> Using cache
---> 6b9645dc1b05
Step 3/9 : ADD redis-5.0.5.tar.gz /usr/local/src/
---> Using cache
---> ececa702ea34
Step 4/9 : RUN cd /usr/local/src/redis-5.0.5 && make PREFIX=/app/redis-5.0.5 MALLOC=libc install && mkdir -p /app/redis-5.0.5/{etc,data,logs,run}
---> Using cache
---> 72316fd04d7c
Step 5/9 : ADD redis_6379.conf /app/redis-5.0.5/etc/
---> Using cache
---> 3a5246a1686f
Step 6/9 : RUN ln -sf /app/redis-5.0.5 /app/redis && groupadd -g 2003 redis && useradd redis -g 2003 -u 2003 && chown -R redis.redis /app
---> Using cache
---> c4c2c94570b5
Step 7/9 : ADD run_redis.sh /app/redis/bin/
---> Using cache
---> de20aabdd502
Step 8/9 : EXPOSE 6379
---> Using cache
---> 5711e0dab25e
Step 9/9 : CMD ["/app/redis/bin/run_redis.sh"]
---> Using cache
---> fcdb7f4cdd9f
Successfully built fcdb7f4cdd9f
Successfully tagged centos-base/redis-5.0.5:v1
#启动redis容器
[root@localhost redis]# docker exec -ti -d -p 6379:6379 centos-base/redis-5.0.5:v1
可以看到启动正常
dockerfile制作tomcat环境app1和app2镜像
#基本tomcat基础镜像制作完成，app1和app2基本一致所以不再重复说明,这里以app1为例
[root@localhost tomcat]# tree centos_tomcat-app1-session
centos_tomcat-app1-session
├── app1.tar.gz
├── build-command.sh
├── context.xml
├── Dockerfile
├── run_tomcat.sh
├── server.xml
└── tomcat-redis.tar.gz
0 directories, 7 files
[root@localhost tomcat]# tree centos_tomcat-app2-session
centos_tomcat-app2-session
├── app.tar.gz
├── build-command.sh
├── context.xml
├── Dockerfile
├── run_tomcat.sh
├── server.xml
└── tomcat-redis.tar.gz
0 directories, 7 files
#app1镜像制作
#提前准备好tomcat支持redis库
tomcat支持redis包下载地址：https://github.com/cc-chen/tomcat8.5-redis-session-manager
[root@localhost centos_tomcat-app1-session]# ls tomcat-redis.tar.gz
tomcat-redis.tar.gz
#修改tomcat的html根路径
[root@localhost centos_tomcat-app1-session]# cat server.xml |grep /data/tomcat/webapps
#提前准备代码文件，我这里以目录app1(centos_tomcat-app1-session镜像的目录)和app2(centos_tomcat-app2-session镜像的目录)为例
[root@localhost centos_tomcat-app1-session]# ls app1.tar.gz
app1.tar.gz
#添加入下配置
[root@localhost centos_tomcat-app1-session]# cat context.xml
dockerfile制作nginx镜像
#查看目录树
[root@localhost nginx]# tree src_tomcat-redis-session/
src_tomcat-redis-session/
├── build-command.sh
├── Dockerfile
├── nginx-1.18.0.tar.gz
└── nginx.conf
0 directories, 4 files
#准备好nginx安装包
#准备好nginx配置文件
[root@localhost src_tomcat-redis-session]# cat nginx.conf
user nginx;
worker_processes auto;
events {
worker_connections 1024;
}
http {
upstream tomse {
#server 172.17.0.3:8080;
#server 172.17.0.3:8080;
server 192.168.100.101:8181;
server 192.168.100.101:8282;
}
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
server {
listen 80;
server_name localhost;
location /usr/local/html {
root html;
index index.html index.htm;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
server {
listen 80;
server_name www.test.com;
location / {
proxy_set_header Host $host;
proxy_pass http://tomse/;
}
}
}
#编写dockerfile
[root@localhost src_tomcat-redis-session]# cat Dockerfile
#!/bin/bash
From centos-base:7.8.2003
LABEL chenjianhong [email protected]
ADD nginx-1.18.0.tar.gz /usr/local/src
RUN cd /usr/local/src/nginx-1.18.0 && ./configure --prefix=/usr/local/nginx --with-http_sub_module && make && make install
ADD nginx.conf /usr/local/nginx/conf/
RUN echo "This is test dockerfile nginx" > /usr/local/nginx/html/index.html && chown -R nginx.nginx /usr/local/nginx/html && ln -sv /usr/local/nginx/sbin/nginx /usr/sbin/nginx && \
rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone
expose 80
CMD ["nginx", "-g", "daemon off;"]
#编写构建脚本
[root@localhost src_tomcat-redis-session]# cat build-command.sh
#!/bin/bash
docker build -t centos-base/nginx-tomcat-redis:session .
#执行构建
[root@localhost src_tomcat-redis-session]# bash build-command.sh
Sending build context to Docker daemon 1.046MB
Step 1/8 : From centos-base:7.8.2003
---> df9d37a83b7a
Step 2/8 : LABEL chenjianhong [email protected]
---> Using cache
---> 6b9645dc1b05
Step 3/8 : ADD nginx-1.18.0.tar.gz /usr/local/src
---> Using cache
---> 2fd4fa3dd583
Step 4/8 : RUN cd /usr/local/src/nginx-1.18.0 && ./configure --prefix=/usr/local/nginx --with-http_sub_module && make && make install
---> Using cache
---> bea0e89d650a
Step 5/8 : ADD nginx.conf /usr/local/nginx/conf/
---> Using cache
---> 0e7a876cc055
Step 6/8 : RUN echo "This is test dockerfile nginx" > /usr/local/nginx/html/index.html && chown -R nginx.nginx /usr/local/nginx/html && ln -sv /usr/local/nginx/sbin/nginx /usr/sbin/nginx && rm -rf /etc/localtime && ln -snf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone
---> Using cache
---> aa296034f907
Step 7/8 : expose 80
---> Using cache
---> b1192ae8d84c
Step 8/8 : CMD ["nginx", "-g", "daemon off;"]
---> Using cache
---> 5b1c307c4cb9
Successfully built 5b1c307c4cb9
Successfully tagged centos-base/nginx-tomcat-redis:session
#启动容器
[root@localhost src_tomcat-redis-session]# docker run -it -d -p 80:80 centos-base/nginx-tomcat-redis:session
启动各业务容器测试
测试
可以看到已经实现的session共享，并且是属于两个不同的业务容器