[Docker module] Use Dockerfile to build your own tomcat image

Dockerfile build image example
Use Dockerfile to build your own tomcat image

1. First, create a directory to store the files needed to build the image.
   As shown in the figure:
   My files are stored in /www/mydockerfile/tomcat directory, dockerfile file, test project apptest directory, tomcat, jdk

   

   Create a directory, enter the directory, download tomcat, jdk, create a test page

   mkdir -p /www/mydockerfile/tomcat/apptest
   cd /www/mydockerfile/tomcat
   echo "Tomcat test app1" > /www/mydockerfile/tomcat/apptest/index.jsp
   wget http://node.aapanel.com/install/src/apache-tomcat-9.0.62.tar.gz && wget http://node.aapanel.com/install/src/jdk-8u121-linux-x64.rpm
   

   

   The content of the dockerfile file is as follows: Please use the terminal or SSH tool to create it directly.

   cat > dockerfile << EOF
   FROM centos
   ## FROM from centos image, start build new image
   
   ADD apache-tomcat-9.0.62.tar.gz /usr/local
   ## ADD add files and automatically extract to /usr/local/apache-tomcat-9.0.62
   
   COPY apptest /usr/local/apache-tomcat-9.0.62/webapps/apptest
   ## COPY Copy all files under apptest to the container, if the container directory does not exist, the apptest directory will be created automatically
   
   COPY jdk-8u121-linux-x64.rpm /tmp/
   ## COPY copy jdk-8u121-linux-x64.rpm file to /tmp/
   
   ENV MYPATH=/usr/local/apache-tomcat-9.0.62
   ## ENV set container environment variables
   
   WORKDIR \$MYPATH
   ## WORKDIR Set the working directory, that is, enter the default directory of the container
   
   EXPOSE 8080 8009
   ## EXPOSE container exposed port
   
   RUN rpm -ivh /tmp/jdk-8u121-linux-x64.rpm && rm -f /tmp/jdk-8u121-linux-x64.rpm
   ## RUN command to install jdk, delete files after installation is complete
   
   CMD ["/usr/local/apache-tomcat-9.0.62/bin/catalina.sh", "run"]
   ## CMD Specify the command to run in the container, start tomcat.
   EOF
   

   

2. Build tomcat image:
   Docker --> Image --> Build Image
   Dockerfile: /www/mydockerfile/tomcat/dockerfile
   Tag: tomcat_test:1.0

   
   

   Build image complete
   

3. Create a container using the built image:
   Container --> Add container Note: The container added this time does not have data persistence set. If necessary, please set it at the Volume

   

   Container created successfully

   

4. Access the tomcat of the container, if you cannot access it, please open port 8080 in the Security interface
   Use a browser to visit and check the effect: http://ip:8080/apptest/

   

For more information on how to use the dockerfile command, please check the official Docker documentation:
https://docs.docker.com/engine/reference/builder/