ubuntu16.04 tomcat集群

一.创建容器

1.Dockerfile 版本指定7.0

from tomcat:7.0.82
COPY  sources.list  /etc/apt/sources.list
EXPOSE 8080

2.sources.list 源

# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable

3.生成tomcat镜像

docker build -t pic:latest .

4.生成两个tomcat容器

#pic1 容器
docker run -v /home/eva/src1:/usr/local/tomcat/webapps  --name pci1  -d -p 18080:8080 pic:latest

#pic2容器
docker run -v /home/eva/src2:/usr/local/tomcat/webapps  --name pci2  -d -p 28080:8080 pic:latest

然后把项目war包，分别拷贝到src1和src2目录下

5.生成redis容器

docker run --name redis -d -p 6379:6379 redis:latest

6.查看所有正在运行的容器,停止，启动，重启

root@ubuntuserver:/home/eva# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                     NAMES
dd60175f3224        pic:latest          "catalina.sh run"        9 seconds ago       Up 9 seconds        0.0.0.0:28080->8080/tcp   pci2
81e115052997        pic:latest          "catalina.sh run"        39 seconds ago      Up 39 seconds       0.0.0.0:18080->8080/tcp   pci1
9ea719f54b31        redis:latest        "docker-entrypoint.s…"   10 hours ago        Up 14 minutes       0.0.0.0:6379->6379/tcp    redis
root@ubuntuserver:/home/eva# docker stop dd6
dd6
root@ubuntuserver:/home/eva# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                       PORTS                     NAMES
dd60175f3224        pic:latest          "catalina.sh run"        19 seconds ago      Exited (143) 2 seconds ago                             pci2
81e115052997        pic:latest          "catalina.sh run"        49 seconds ago      Up 48 seconds                0.0.0.0:18080->8080/tcp   pci1
9ea719f54b31        redis:latest        "docker-entrypoint.s…"   10 hours ago        Up 14 minutes                0.0.0.0:6379->6379/tcp    redis
root@ubuntuserver:/home/eva# docker start dd6
dd6
root@ubuntuserver:/home/eva# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                     NAMES
dd60175f3224        pic:latest          "catalina.sh run"        26 seconds ago      Up 1 second         0.0.0.0:28080->8080/tcp   pci2
81e115052997        pic:latest          "catalina.sh run"        56 seconds ago      Up 55 seconds       0.0.0.0:18080->8080/tcp   pci1
9ea719f54b31        redis:latest        "docker-entrypoint.s…"   10 hours ago        Up 14 minutes       0.0.0.0:6379->6379/tcp    redis
root@ubuntuserver:/home/eva# docker restart 81e11
81e11
root@ubuntuserver:/home/eva# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                     NAMES
dd60175f3224        pic:latest          "catalina.sh run"        34 seconds ago       Up 10 seconds       0.0.0.0:28080->8080/tcp   pci2
81e115052997        pic:latest          "catalina.sh run"        About a minute ago   Up 1 second         0.0.0.0:18080->8080/tcp   pci1
9ea719f54b31        redis:latest        "docker-entrypoint.s…"   10 hours ago         Up 15 minutes       0.0.0.0:6379->6379/tcp    redis
root@ubuntuserver:/home/eva# 

二.nginx 负载均衡配置

1.在nginx.conf中的server{}节点上面添加

#和 sever节点同级   
include ttt/*.conf;

2.在nginx.conf 同级创建ttt目录,里面添加aslan.conf配置文件

upstream www.aslan.com{
    server 127.0.0.1:18080 weight=1;
    server 127.0.0.1:28080 weight=1;
 }
server {
    listen 80;
    server_name wwww.aslan.com;
    location / {
        proxy_pass http://www.aslan.com;
    }
}

3.检查nginx配置文件是否有问题

root@ubuntuserver:/usr/local/nginx/sbin# ./nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful

4.重启nginx

root@ubuntuserver:/usr/local/nginx/sbin# ./nginx -s reload
root@ubuntuserver:/usr/local/nginx/sbin# 

5.访问nginx

负载均衡没问题

三.Cookie的使用

（1）在用户登录的时候，生成名为aslan_login_token的cookie。
（2）在获取用户信息的时候，检查名为aslan_login_token的cookie的值。如果有值解析出来对于的值(暂为user)

比如用户登录时在pic1服务器，在获取用户信息的时候被分配到了pic2服务器。通过使用aslan_login_token解决session登录共享的问题。即单点登录的问题。

四.Redis存储对象

五.