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

时间：2023-03-09 15:51:40
docker Dockerfile学习---nginx负载均衡tomcat服务

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

# 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..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. /usr/local/tomcat7

# 服务端口

EXPOSE

4、构建镜像

$ docker build -t centos:tomcat .

5、启动容器

启动tomcat1

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

启动tomcat2

$ docker run --name tomcat02 -d -p : -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"               minutes ago      Up  minutes       0.0.0.0:->/tcp                          tomcat02

23a5ff761777        centos:tomcat       "/bin/bash"               minutes ago      Up  minutes       0.0.0.0:->/tcp                          tomcat01

d350b2c8a3d5        centos:nginx        "/bin/sh -c '/bin/sh…"    minutes ago      Up  minutes       0.0.0.0:->/tcp, 0.0.0.0:->/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=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 172.17.0.3  netmask 255.255.0.0  broadcast 172.17.255.255

        ether ::ac:::  txqueuelen   (Ethernet)

        RX packets   bytes  (13.3 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (156.3 KiB)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions

登陆tomcat2

[root@b016a1cd5a1e /]# yum install net-tools -y

[root@b016a1cd5a1e /]# ifconfig

eth0: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu

        inet 172.17.0.4  netmask 255.255.0.0  broadcast 172.17.255.255

        ether ::ac:::  txqueuelen   (Ethernet)

        RX packets   bytes  (13.3 MiB)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (222.5 KiB)

        TX errors   dropped  overruns   carrier   collisions 

lo: flags=<UP,LOOPBACK,RUNNING>  mtu

        inet 127.0.0.1  netmask 255.0.0.0

        loop  txqueuelen   (Local Loopback)

        RX packets   bytes  (0.0 B)

        RX errors   dropped   overruns   frame

        TX packets   bytes  (0.0 B)

        TX errors   dropped  overruns   carrier   collisions

登陆nginx容器

$ docker exec -it d350b2c8a3d5 bash

修改nginx配置文件

[root@d350b2c8a3d5 nginx-1.8.]# vi /usr/local/nginx/conf/nginx.conf
在http{} 添加

upstream tomcat_server {

server 172.17.0.3: weight=;

server 172.17.0.4: weight=;

}

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.]# 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

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