Migrasi aplikasi java ke Docker Image

README.md

Migrasi aplikasi java ke Docker Image

Kompile ke War di lokal dan jalankan di Tomcat

• Siapkan JDK, Maven, dan Tomcat 8.5
• Contoh aplikasi dari Mkyong CounterWebApp
• Build aplikasi dengan mvn clean package
• Jalankan package war aplikasi di Tomcat.

  • Pindahkan target/CounterWebApp.war ke tomcat/webapps/

  • Jalankan tomcat

    cd tomcat/bin
    chmod +x *.sh
    ./startup.sh
    
    # lihat log
    tail -f ../logs/catalina.out

  • Buka browser http://localhost:8080/CounterWebApp/

Buat image container dari package war aplikasi

• Butuh image container tomcat:8.5
• Butuh package war aplikasi target/CounterWebApp.war
• Pull image tomcat 8.5 docker pull tomcat:8.5
• Buat Dockerfile

FROM tomcat:8.5

COPY ./CounterWebApp.war /usr/local/tomcat/webapps/

• Build image container aplikasi docker build -t counter-web-app .
• Lihat hasil build dengan docker images
• Tes jalankan dengan docker run -itd -p 8000:8080 --name counter-web-app-1 counter-web-app
• Buka web http://alamat:8000/CounterWebApp

Buat image container dari source aplikasi

• Buat Dockerfile

FROM openjdk:8-jdk

# siapkan tomcat
ENV CATALINA_HOME /usr/local/tomcat
ENV PATH $CATALINA_HOME/bin:$PATH
RUN mkdir -p "$CATALINA_HOME"
WORKDIR $CATALINA_HOME
RUN wget http://www-eu.apache.org/dist/tomcat/tomcat-8/v8.5.34/bin/apache-tomcat-8.5.34.tar.gz \
    && tar -xf apache-tomcat-8.5.34.tar.gz && mv apache-tomcat-8.5.34/* $CATALINA_HOME && rm apache-tomcat-8.5.34.tar.gz

# siapkan maven
RUN cd /tmp && wget http://www-eu.apache.org/dist/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.zip \
    && unzip apache-maven-3.5.4-bin.zip && rm apache-maven-3.5.4-bin.zip 

# compile aplikasi
COPY Maven-WebProject-CounterWebApp.zip /tmp
RUN cd /tmp && unzip Maven-WebProject-CounterWebApp.zip && rm Maven-WebProject-CounterWebApp.zip \
    && cd /tmp/CounterWebApp && ../apache-maven-3.5.4/bin/mvn package

# siapkan aplikasi
RUN cp /tmp/CounterWebApp/target/CounterWebApp.war /usr/local/tomcat/webapps/

# remove app source code
RUN rm -rf /tmp/CounterWebApp

EXPOSE 8080
CMD ["catalina.sh", "run"]

• Build image container aplikasi docker build -t counter-web-app .
• Lihat hasil build dengan docker images
• Tes jalankan dengan docker run -itd -p 8000:8080 --name counter-web-app-1 counter-web-app
• Buka web http://alamat:8000/CounterWebApp

Otomasi build image dengan CI Server

• Buat docker-compose.yml dengan image ci server, version control
• Jalankan dengan docker-compose up -d
• TODO

Referensi

• https://www.mkyong.com/maven/how-to-create-a-web-application-project-with-maven/
• https://hub.docker.com/_/tomcat/

Dockerfile

FROM openjdk:8-jdk

# siapkan tomcat
ENV CATALINA_HOME /usr/local/tomcat
ENV PATH $CATALINA_HOME/bin:$PATH
RUN mkdir -p "$CATALINA_HOME"
WORKDIR $CATALINA_HOME
RUN wget http://www-eu.apache.org/dist/tomcat/tomcat-8/v8.5.34/bin/apache-tomcat-8.5.34.tar.gz \
    && tar -xf apache-tomcat-8.5.34.tar.gz && mv apache-tomcat-8.5.34/* $CATALINA_HOME && rm apache-tomcat-8.5.34.tar.gz

# siapkan maven
RUN cd /tmp && wget http://www-eu.apache.org/dist/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.zip \
    && unzip apache-maven-3.5.4-bin.zip && rm apache-maven-3.5.4-bin.zip 

# compile aplikasi
COPY Maven-WebProject-CounterWebApp.zip /tmp
RUN cd /tmp && unzip Maven-WebProject-CounterWebApp.zip && rm Maven-WebProject-CounterWebApp.zip \
    && cd /tmp/CounterWebApp && ../apache-maven-3.5.4/bin/mvn package

# siapkan aplikasi
RUN cp /tmp/CounterWebApp/target/CounterWebApp.war /usr/local/tomcat/webapps/

# remove app source code
RUN rm -rf /tmp/CounterWebApp

EXPOSE 8080
CMD ["catalina.sh", "run"]

Dockerfile.warfile

FROM tomcat:8.5

COPY ./CounterWebApp.war /usr/local/tomcat/webapps/