Docker : Use Dockerfile2019/07/24 |
Use Dockerfile and create Docker images automatically.
It is also useful for configuration management. |
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[1] | For example, Create a Dockerfile to install apache2 and sshd and also install Supervisor to control multiple services on a Container. |
root@dlp:~#
vi Dockerfile # create new FROM debian MAINTAINER ServerWorld <admin@srv.world> RUN apt-get update RUN apt-get -y install openssh-server apache2 supervisor RUN echo "Hello DockerFile World" > /var/www/html/index.html RUN mkdir /var/run/sshd; chmod 755 /var/run/sshd RUN mkdir /root/.ssh; chown root. /root/.ssh; chmod 700 /root/.ssh RUN ssh-keygen -A ADD supervisord.conf /etc/supervisor/supervisord.conf ADD .ssh/id_rsa.pub /root/.ssh/authorized_keys EXPOSE 22 80 CMD ["/usr/bin/supervisord"] [supervisord] nodaemon=true [program:sshd] command=/usr/sbin/sshd -D autostart=true autorestart=true [program:apache2] command=/usr/sbin/apachectl -D FOREGROUND autostart=true autorestart=true # generate SSH key root@dlp:~# ssh-keygen -q -N "" -f /root/.ssh/id_rsa
# build image ⇒ docker build -t [image name]:[tag] ./ root@dlp:~# docker build -t web_server:latest ./ Sending build context to Docker daemon 25.09kB Step 1/12 : FROM debian ---> 00bf7fdd8baf Step 2/12 : MAINTAINER ServerWorld <admin@srv.world> ---> Running in 464a037bb269 Removing intermediate container 464a037bb269 ---> da7062920d80 Step 3/12 : RUN apt-get update ---> Running in a5f6c9129047 ..... ..... Successfully built 42e95a62ed8e Successfully tagged web_server:latestroot@dlp:~# docker images REPOSITORY TAG IMAGE ID CREATED SIZE web_server latest 42e95a62ed8e 43 seconds ago 300MB srv.world/debian_apache2 latest 4295df3e5c82 6 minutes ago 243MB debian latest 00bf7fdd8baf 2 weeks ago 114MB # run Container on background root@dlp:~# docker run -d -p 2022:22 -p 8081:80 web_server ad9085a4054fa94f0a8b0ecb44eb01311e17af2bb289fc2b7d5b1ff08de57648root@dlp:~# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ad9085a4054f web_server "/usr/bin/supervisord" 27 seconds ago Up 26 seconds 0.0.0.0:2022->22/tcp, 0.0.0.0:8081->80/tcp distracted_visvesvaraya # verify accesses root@dlp:~# curl localhost:8081 Hello DockerFile World ssh -p 2022 localhost /bin/hostname
The authenticity of host '[localhost]:2022 ([::1]:2022)' can't be established.
ECDSA key fingerprint is SHA256:LZCF9x1nEZn442WB4WUMz/Lz0WQ90b4wVeXb2fqQ/os.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[localhost]:2022' (ECDSA) to the list of known hosts.
ad9085a4054f
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The format of Dockerfile is [INSTRUCTION arguments] . Refer to the following description for INSTRUCTION.
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