【DockerCE】使用dockerfile构建基于Rocky Linux的Tomcat镜像

一、环境介绍

操作系统：CentOS 7.9

DockerCE：20.10.9

其他软件：

• apache-tomcat-8.5.72.tar.gz（基于官方版本，对安全和性能做了一系列的优化，并将一个测试war包提前放到webapps目录下）
• jdk1.8_u301-linux-x64.tar.gz
• dockerfile

dockerfile完整内容

#dockerfile
FROM rockylinux/rockylinux:latest
MAINTAINER cnskylee

ADD jdk1.8_u301-linux-x64.tar.gz /usr
ADD apache-tomcat-8.5.72.tar.gz /

ENV JAVA_HOME /usr/jdk1.8.0_301
ENV CLASSPATH .:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar
ENV PATH $JAVA_HOME/bin:$PATH:$HOME/bin
ENV CATALINA_HOME /apache-tomcat-8.5.72
ENV CATALINA_BASE /apache-tomcat-8.5.72

EXPOSE 18170
EXPOSE 30011

CMD /apache-tomcat-8.5.72/bin/catalina.sh run

备注：这里有一个坑，需要给大家标出来。就是基础镜像不要选择alpine:latest，使用这个基础镜像，构建镜像没问题，但是在运行容器的时候会失败，始终提示/usr/jdk1.8.0_301/bin/java找不到文件。查询了一上午，没解决，下午换成Rocky Linux的docker镜像，一切正常了。

二、构建镜像

# ls -ltr
total 151380
-rwxr-xr-x 1 root root   9485325 Oct 17 22:21 apache-tomcat-8.5.72.tar.gz
-rw-r--r-- 1 root root 145521228 Oct 17 22:32 jdk1.8_u301-linux-x64.tar.gz
-rwxr-xr-x 1 root root       457 Oct 18 02:40 dockerfile

# docker build -t tomcat-rocky:v8.5.72 .
Sending build context to Docker daemon  879.1MB
Step 1/12 : FROM rockylinux/rockylinux:latest
 ---> 333da17614b6
Step 2/12 : MAINTAINER cnskylee from sgcc.com.cn(cnskylee@126.com)
 ---> Running in 5a4ff3053ec9
Removing intermediate container 5a4ff3053ec9
 ---> 475be38fe1c6
Step 3/12 : ADD jdk1.8_u301-linux-x64.tar.gz /usr
 ---> 77e3d28164e5
Step 4/12 : ADD apache-tomcat-8.5.72.tar.gz /
 ---> 0528a91dafd9
Step 5/12 : ENV JAVA_HOME /usr/jdk1.8.0_301
 ---> Running in b7d8399af85d
Removing intermediate container b7d8399af85d
 ---> 4236e293c567
Step 6/12 : ENV CLASSPATH .:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar
 ---> Running in 20e049a5b7b5
Removing intermediate container 20e049a5b7b5
 ---> 30cb418a4131
Step 7/12 : ENV PATH $JAVA_HOME/bin:$PATH:$HOME/bin
 ---> Running in 944f6ec16879
Removing intermediate container 944f6ec16879
 ---> 5fb0e8b44787
Step 8/12 : ENV CATALINA_HOME /apache-tomcat-8.5.72
 ---> Running in 11b1ecfbc676
Removing intermediate container 11b1ecfbc676
 ---> 842897ad3e7c
Step 9/12 : ENV CATALINA_BASE /apache-tomcat-8.5.72
 ---> Running in 7e6d6d1b4aa8
Removing intermediate container 7e6d6d1b4aa8
 ---> d01e1ffaddaa
Step 10/12 : EXPOSE 18170
 ---> Running in 482fcb5d6dea
Removing intermediate container 482fcb5d6dea
 ---> d2a95a179a7f
Step 11/12 : EXPOSE 30011
 ---> Running in fcd6238626ca
Removing intermediate container fcd6238626ca
 ---> f699b624b4f7
Step 12/12 : CMD /apache-tomcat-8.5.72/bin/catalina.sh run
 ---> Running in de1355b68c22
Removing intermediate container de1355b68c22
 ---> 081fc550edc2
Successfully built 081fc550edc2
Successfully tagged tomcat-rocky:v8.5.72

# docker images
REPOSITORY              TAG       IMAGE ID       CREATED          SIZE
tomcat-rocky            v8.5.72   081fc550edc2   14 minutes ago   599MB
rockylinux/rockylinux   latest    333da17614b6   3 months ago     227MB

三、运行容器

# docker run -dti -p 30011:30011 -p 18170:18170 tomcat-rocky:v8.5.72 
9a531c847c12cf0fa1712a8a61e83a598be5ac2c00e5343c22708f7c5b13a8d4

# docker ps
CONTAINER ID   IMAGE                  COMMAND                  CREATED         STATUS         PORTS                                                                                          NAMES
9a531c847c12   tomcat-rocky:v8.5.72   "/bin/sh -c '/apache…"   6 seconds ago   Up 4 seconds   0.0.0.0:18170->18170/tcp, :::18170->18170/tcp, 0.0.0.0:30011->30011/tcp, :::30011->30011/tcp   eager_ritchie

四、访问测试

1. 集成的用于Prometheus监控的metrics

2. 测试war包

OK，使用dockerfile来构建一个简单的Tomcat镜像，到这里就结束了。