docker Dockerfile学习---nginx负载均衡tomcat服务

我就是我 2021-11-05 11:54 255阅读 0赞

1、此过程在nginx的基础上，也就是上篇博客写的内容。

2、创建项目目录并上传包，解压

$ mkdir centos_tomcat
    $ cd centos_tomcat

$ tar zxvf jdk-7u80-linux-x64.tar.gz  
  $ tar zxvf apache-tomcat-7.0.94.tar.gz

3、编辑Dockerfile

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# From表示使用centos:latest这个镜像为基础构建我们的镜像
    FROM centos:latest
    
    # 创建者的基本信息
    MAINTAINER xiaozhou (xiaozhou@docker.com)
    
    LABEL Discription="基于centos的nginx镜像" version="1.0"
    
    # 把jdk文件拷到容器
    ADD jdk1.7.0_80 /usr/local/java
    
    # 设置环境变量
    ENV JAVA_HOME /usr/local/java
    ENV JAVA_BIN /usr/local/java/bin
    ENV JRE_HOME /usr/local/java/jre
    ENV PATH $PATH:/usr/local/java/bin:/usr/local/java/jre/bin
    ENV CLASSPATH /usr/local/java/jre/bin:/usr/local/java/lib:/usr/local/java/jre/lib/charsets.jar
    
    # 把tomcat文件拷到容器
    ADD apache-tomcat-7.0.94 /usr/local/tomcat7
    
    # 服务端口
    EXPOSE 8080

4、构建镜像

$ docker build -t centos:tomcat .

5、启动容器

启动tomcat1

$ docker run --name tomcat01 -d -p 8081:8080 -it centos:tomcat /bin/bash
    23a5ff7617772787f644a510b201fc343d541946ea12aedfb13bb2ab64dbfdeb

启动tomcat2

$ docker run --name tomcat02 -d -p 8082:8080 -it centos:tomcat /bin/bash
    b016a1cd5a1e7da602a11243107840bf6eff47f8321a284a1f15c95988228b86

6、启动tomcat服务

登陆容器，启动服务

启动服务1

$ docker exec -it 23a5ff761777 /bin/bash
    [root@23a5ff761777 /]# cd /usr/local/tomcat7/bin
    [root@23a5ff761777 bin]# ./startup.sh 
    Using CATALINA_BASE: /usr/local/tomcat7
    Using CATALINA_HOME: /usr/local/tomcat7
    Using CATALINA_TMPDIR: /usr/local/tomcat7/temp
    Using JRE_HOME: /usr/local/java/jre
    Using CLASSPATH: /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar
    Tomcat started.

启动服务2

$ docker exec -it b016a1cd5a1e /bin/bash
    [root@b016a1cd5a1e /]# cd /usr/local/tomcat7/bin
    [root@b016a1cd5a1e bin]# ./startup.sh 
    Using CATALINA_BASE:   /usr/local/tomcat7
    Using CATALINA_HOME:   /usr/local/tomcat7
    Using CATALINA_TMPDIR: /usr/local/tomcat7/temp
    Using JRE_HOME:        /usr/local/java/jre
    Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar
    Tomcat started.

7、验证并修改默认页面

浏览器输入：  
http://192.168.121.121:8081

出现tomcat服务的默认访问页面

浏览器输入：  
http://192.168.121.121:8082

出现tomcat服务的默认访问页面

登陆容器tomcat1

[root@23a5ff761777 /]# cd /usr/local/tomcat7/webapps/ROOT
    [root@23a5ff761777 ROOT]# rm -f index.jsp
    [root@23a5ff761777 ROOT]# vi index.html
    <html>
        <title>
            webserver
        </title>
        <body>
            <a>Simple Webserver Server1!</a>
        </body>
    </html>

登陆容器tomcat2

[root@b016a1cd5a1e /]# cd /usr/local/tomcat7/webapps/ROOT
    [root@b016a1cd5a1e ROOT]# rm -f index.jsp
    [root@b016a1cd5a1e ROOT]# vi index.html
    <html>
        <title>
            webserver
        </title>
        <body>
            <a>Simple Webserver Server2!</a>
        </body>
    </html>

刷新打开的访问页面，发现默认tomcat页面变化为

Simple Webserver Server1! 
    
    和

Simple Webserver Server2!

8、修改nginx配置

查看所有容器：

$ docker ps
    CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                           NAMES
    b016a1cd5a1e        centos:tomcat       "/bin/bash"              11 minutes ago      Up 11 minutes       0.0.0.0:8082->8080/tcp                          tomcat02
    23a5ff761777        centos:tomcat       "/bin/bash"              16 minutes ago      Up 12 minutes       0.0.0.0:8081->8080/tcp                          tomcat01
    d350b2c8a3d5        centos:nginx        "/bin/sh -c '/bin/sh…"   30 minutes ago      Up 30 minutes       0.0.0.0:32769->80/tcp, 0.0.0.0:32768->443/tcp   wonderful_elion

查看tomcat容器IP：

登陆tomcat1

$ docker exec -it 23a5ff761777 /bin/bash
    [root@23a5ff761777 /]# yum install net-tools -y 
    [root@23a5ff761777 /]# ifconfig
    eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.17.0.3  netmask 255.255.0.0  broadcast 172.17.255.255
            ether 02:42:ac:11:00:03  txqueuelen 0  (Ethernet)
            RX packets 2975  bytes 14039534 (13.3 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 2479  bytes 160092 (156.3 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            loop  txqueuelen 1  (Local Loopback)
            RX packets 0  bytes 0 (0.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 0  bytes 0 (0.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

登陆tomcat2

[root@b016a1cd5a1e /]# yum install net-tools -y
    [root@b016a1cd5a1e /]# ifconfig
    eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.17.0.4  netmask 255.255.0.0  broadcast 172.17.255.255
            ether 02:42:ac:11:00:04  txqueuelen 0  (Ethernet)
            RX packets 2541  bytes 14008601 (13.3 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 2244  bytes 227840 (222.5 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            loop  txqueuelen 1  (Local Loopback)
            RX packets 0  bytes 0 (0.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 0  bytes 0 (0.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

登陆nginx容器

$ docker exec -it d350b2c8a3d5 bash

修改nginx配置文件

[root@d350b2c8a3d5 nginx-1.8.0]# vi /usr/local/nginx/conf/nginx.conf

在http{} 添加
    upstream tomcat_server {
    server 172.17.0.3:8080 weight=1;
    server 172.17.0.4:8080 weight=1;
    }
    
    在server{} 修改内容为
    location / {
    proxy_pass http://tomcat_server;
    proxy_redirect default;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    }

重载配置

[root@d350b2c8a3d5 nginx-1.8.0]# cd /usr/local/nginx/sbin
    [root@d350b2c8a3d5 sbin]# ./nginx -s reload

浏览器输入：  
http://192.168.121.121:32769/

出现tomcat测试内容信息，刷新页面后出现另一个tomcat的测试内容，页面轮训出现结果。

参考：

http://www.mamicode.com/info-detail-2412717.html

转载于:https://www.cnblogs.com/xiaoxiaozhou/p/11265837.html

[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
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