创建带Tomcat服务的Centos Docker镜像

Tomacat服务器是一个免费的开入源代码的Web应用服务器，属于轻量级应用服务器，在中小型系统和并发访问用户不是很多的场合下普遍使用，是开发和高度JSP程序的首选。
下面我就分步骤向大家介绍如何创建带Nginx服务的Centos Docker镜像。
基础镜像：

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
sshd                dockerfile          411d5fb16366        2 days ago          278 MB
centos              latest              0f73ae75014f        5 weeks ago         172.3 MB

其中镜像sshd:dockerfile是以镜像centos为基础的开放SSH服务的镜像。
第一部分，手工配置并生成镜像
一 、以镜像sshd-centos为基础新建容器，并指定容器的ssh端口22映射到宿主机的2222端口上.

docker run -d -p 2222:22 sshd:dockerfile /usr/sbin/sshd -D

查看容器运行情况：

[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND               CREATED             STATUS              PORTS                  NAMES
bdde7d657620        sshd:dockerfile     "/usr/sbin/sshd -D"   6 seconds ago       Up 5 seconds        0.0.0.0:2222->22/tcp   romantic_bardeen

二、在宿主机上通过ssh登录容器

ssh localhost -p 2222

如果提示没有ssh命令请安装openssh-clients

yum install -y openssh-clients

三、下载源码包及相关软件
1、安装wget

cd /usr/local/src
yum install -y wget

2、下载源码包
下载JDK

wget --no-check-certificate -c --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u60-
b27/jdk-8u60-linux-x64.tar.gz

上面的地址要去官网的地址去获取，每超过30分钟就会失效：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

下载Tomcat

wget http://apache.fayea.com/tomcat/tomcat-8/v8.0.27/bin/apache-tomcat-8.0.27.tar.gz

四、安装JDK

1、解压源码包

tar -zxvf jdk-8u60-linux-x64.tar.gz
mv jdk1.8.0_60 /usr/local/jdk1.8.0_60

2、配置JDK环境脚本

touch  /etc/profile.d/java.sh
echo "JAVA_HOME=/usr/local/jdk1.8.0_60" >> /etc/profile.d/java.sh
echo "JAVA_BIN=/usr/local/jdk1.8.0_60/bin" >> /etc/profile.d/java.sh
echo "JRE_HOME=/usr/local/jdk1.8.0_60/jre" >> /etc/profile.d/java.sh
echo "PATH=$PATH:/usr/local/jdk1.8.0_60/bin:/usr/local/jdk1.8.0_60/jre/bin" >> /etc/profile.d/java.sh
echo "CLASSPATH=/usr/local/jdk1.8.0_60/jre/lib:/usr/local/jdk1.8.0_60/lib:/usr/local/jdk1.8.0_60/jre/lib/charsets.jar" >> /etc/profile.d/java.sh

3、导入环境脚本

. /etc/profile.d/java.sh

4、查看是否安装成功

java  -version

如果安装成功就会显示java版本信息

五、安装tomcat
1、解压源码包

tar -zxvf apache-tomcat-8.0.27.tar.gz
mv apache-tomcat-8.0.27 /usr/local/tomcat

2、修改配置文件

cd /usr/local/tomcat/bin
cp catalina.sh catalina.sh.bak
>catalina.sh
echo '#!/bin/sh'>>catalina.sh
echo "JAVA_HOME=/usr/local/jdk1.8.0_60">>catalina.sh
echo "CATALINA_HOME=/usr/local/tomcat" >> catalina.sh
grep -v '^#!/bin/sh' catalina.sh.bak >> catalina.sh

3、启动tomcat服务

 /usr/local/tomcat/bin/catalina.sh start

查看进程

[root@bdde7d657620 bin]# ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.3  82456  3436 ?        Ss   07:00   0:00 /usr/sbin/sshd -D
root        85  0.0  0.4  89792  4520 ?        Ss   07:35   0:00 sshd: root@pts/0
root        87  0.0  0.1  13264  1976 pts/0    Ss   07:35   0:00 -bash
root       316 93.3  7.4 2165884 75864 pts/0   Sl   08:31   0:02 /usr/local/jdk1.8.0_60/bin/java -Djava.util
root       332  0.0  0.1  21284  1268 pts/0    R+   08:31   0:00 ps aux

六、新建启动脚本

vi /usr/local/sbin/run.sh

脚本内容：

#!/bin/bash
/usr/sbin/sshd -D &
/usr/local/tomcat/bin/catalina.sh run

七、生成镜像
1、退出容器，运行下面的命令查看窗口信息

[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND               CREATED             STATUS              PORTS                  NAMES
bdde7d657620        sshd:dockerfile     "/usr/sbin/sshd -D"   About an hour ago   Up About an hour    0.0.0.0:2222->22/tcp   romantic_bardeen

2、生成镜像

[root@localhost ~]# docker commit bdde7d657620 tomcat:centos
d2f8ec74f011e5bcd0b544b251cc120a31e53411f6ab2904c103c5f3a759096d

3、查看镜像

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
tomcat              centos              d2f8ec74f011        44 seconds ago      862.9 MB
sshd                dockerfile          411d5fb16366        2 days ago          278 MB
centos              latest              0f73ae75014f        5 weeks ago         172.3 MB

4、根据新生成的镜像生成容器

[root@localhost ~]# docker run -d -p 2223:22 -p 8081:8080 tomcat:centos /usr/local/sbin/run.sh
5fd0af983d91e621b3b450cfdcc5c35d6ef8d8b1819220395ba44b63c28f1277

分别映射容器的22、8080端口给宿主机的2223、8081端口，并运行启动脚本。
查看新生成的容器：

[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                                          NAMES
5fd0af983d91        tomcat:centos       "/usr/local/sbin/run   9 seconds ago       Up 7 seconds        0.0.0.0:2223->22/tcp, 0.0.0.0:8081->8080/tcp   determined_leakey
bdde7d657620        sshd:dockerfile     "/usr/sbin/sshd -D"    About an hour ago   Up About an hour    0.0.0.0:2222->22/tcp                           romantic_bardeen

5、测试

[root@localhost ~]# curl localhost:8081

<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <title>Apache Tomcat/8.0.27title>
        <link href="favicon.ico" rel="icon" type="image/x-icon" />
        <link href="favicon.ico" rel="shortcut icon" type="image/x-icon" />
        <link href="tomcat.css" rel="stylesheet" type="text/css" />
    head>
.........
省略中间内容
.........
                <div class="col20">
                    <div class="container">
                        <h4>Apache Software Foundationh4>
                        <ul>
                            <li><a href="http://tomcat.apache.org/whoweare.html">Who We Area>li>
                            <li><a href="http://tomcat.apache.org/heritage.html">Heritagea>li>
                            <li><a href="http://www.apache.org">Apache Homea>li>
                            <li><a href="http://tomcat.apache.org/resources.html">Resourcesa>li>
                        ul>
                    div>
                div>
                <br class="separator" />
            div>
            <p class="copyright">Copyright ©1999-2015 Apache Software Foundation.  All Rights Reservedp>
        div>
    body>

html>

测试成功！

第二部分，通过Dockerfile自动生成镜像
由于Dockerfile生成镜像的步骤大多类似，这里直接介绍使用的Dockerfile和需要的脚本文件。

1、新建目录及文件

mkdir /root/tomcat_centos
cd /root/tomcat_centos
touch Dockerfile run.sh

下载JDK
JDK的下载方法与手工配置相同。然后解压并移动到/root/tomcat_centos目录下

tar -zxvf jdk-8u60-linux-x64.tar.gz

目录结构如下

tomcat_centos/
├── Dockerfile
├── jdk1.8.0_60
└── run.sh

2，run.sh脚本内容：

#!/bin/bash
/usr/sbin/sshd -D &
/usr/local/tomcat/bin/catalina.sh run

3、Dockerfile内容

#新生成的镜像是基于sshd-centos镜像
FROM sshd-centos
MAINTAINER by cmsteven
WORKDIR /usr/local/src
#安装wget
RUN yum install -y wget
#下载tomcat源码包
RUN wget http://apache.fayea.com/tomcat/tomcat-8/v8.0.27/bin/apache-tomcat-8.0.27.tar.gz
#从宿主机上复制JDK文件夹
ADD jdk1.8.0_60 /usr/local/jdk1.8.0_60
#配置JDK环境脚本
RUN touch  /etc/profile.d/java.sh
RUN echo "JAVA_HOME=/usr/local/jdk1.8.0_60" >> /etc/profile.d/java.sh
RUN echo "JAVA_BIN=/usr/local/jdk1.8.0_60/bin" >> /etc/profile.d/java.sh
RUN echo "JRE_HOME=/usr/local/jdk1.8.0_60/jre" >> /etc/profile.d/java.sh
RUN echo "PATH=$PATH:/usr/local/jdk1.8.0_60/bin:/usr/local/jdk1.8.0_60/jre/bin" >> /etc/profile.d/java.sh
RUN echo "CLASSPATH=/usr/local/jdk1.8.0_60/jre/lib:/usr/local/jdk1.8.0_60/lib:/usr/local/jdk1.8.0_60/jre/lib/charsets.jar" >> /etc/profile.d/java.sh
#导入JDK环境
RUN . /etc/profile.d/java.sh
#解压tomcat源码包
RUN tar -zxvf /usr/local/src/apache-tomcat-8.0.27.tar.gz
RUN mv /usr/local/src/apache-tomcat-8.0.27 /usr/local/tomcat
#修改tomcat启动脚本
WORKDIR /usr/local/tomcat/bin
RUN cp  /usr/local/tomcat/bin/catalina.sh  /usr/local/tomcat/bin/catalina.sh.bak
RUN > /usr/local/tomcat/bin/catalina.sh
RUN echo '#!/bin/sh'>> /usr/local/tomcat/bin/catalina.sh
RUN echo "JAVA_HOME=/usr/local/jdk1.8.0_60">> /usr/local/tomcat/bin/catalina.sh
RUN echo "CATALINA_HOME=/usr/local/tomcat" >>  /usr/local/tomcat/bin/catalina.sh
RUN grep -v '^#!/bin/sh' catalina.sh.bak >>  /usr/local/tomcat/bin/catalina.sh
#启动tomcat服务
RUN  /usr/local/tomcat/bin/catalina.sh start
#复制容器启动脚本
ADD run.sh /usr/local/sbin/run.sh
#设置脚本权限
RUN chmod 755 /usr/local/sbin/run.sh
CMD ["/usr/local/sbin/run.sh"]
#开放容器的22和8080端口
EXPOSE 8080
EXPOSE 22