Podman : Use Dockerfile2022/04/28

	Use Dockerfile and create Container images automatically. It is also useful for configuration management for Container images.
[1]	For example, Create a Dockerfile that Nginx is installed and started.

root@dlp:~#

vi Dockerfile

# create new

FROM ubuntu
MAINTAINER ServerWorld <admin@srv.world>

RUN apt-get update
RUN apt-get -y install nginx
RUN echo "Dockerfile Test on Nginx" > /var/www/html/index.html

EXPOSE 80
CMD ["/usr/sbin/nginx", "-g", "daemon off;"]

# build image ⇒ podman build -t [image name]:[tag] .

root@dlp:~#

podman build -t srv.world/ubuntu-nginx:latest .

STEP 1/7: FROM ubuntu
STEP 2/7: MAINTAINER ServerWorld <admin@srv.world>
--> b51cc134aaf
STEP 3/7: RUN apt-get update

.....
.....

STEP 6/7: EXPOSE 80
--> 1f6e0c4c82f
STEP 7/7: CMD ["/usr/sbin/nginx", "-g", "daemon off;"]
COMMIT srv.world/ubuntu-nginx:latest
--> 00787fa1628
Successfully tagged srv.world/ubuntu-nginx:latest
00787fa1628bc83158413f180fe627d2f438e5f746c8bf00becc95494bd9ab92

root@dlp:~#

podman images

REPOSITORY                TAG         IMAGE ID      CREATED         SIZE
srv.world/ubuntu-nginx    latest      00787fa1628b  52 seconds ago  170 MB
srv.world/ubuntu-apache2  latest      c5d3a78bc38f  4 minutes ago   224 MB
docker.io/library/ubuntu  latest      3f4714ee068a  6 days ago      80.3 MB

# run container

root@dlp:~#

podman run -d -p 80:80 srv.world/ubuntu-nginx

2e4306345e393868c78d14316f8ff141c0231868750186bf74c0f48304a79f90

root@dlp:~#

podman ps

CONTAINER ID  IMAGE                          COMMAND               CREATED        STATUS            PORTS               NAMES
2e4306345e39  srv.world/ubuntu-nginx:latest  /usr/sbin/nginx -...  6 seconds ago  Up 6 seconds ago  0.0.0.0:80->80/tcp  modest_wilbur

# verify accesses

root@dlp:~#

curl localhost

Dockerfile Test on Nginx

# also possible to access via container network

root@dlp:~#

podman inspect -l | grep \"IPAddress

            "IPAddress": "10.88.0.8",
                    "IPAddress": "10.88.0.8",

root@dlp:~#

curl 10.88.0.8

Dockerfile Test on Nginx

The format of Dockerfile is [INSTRUCTION arguments] .
Refer to the following description for INSTRUCTION.

INSTRUCTION	Description
FROM	It sets the Base Image for subsequent instructions.
MAINTAINER	It sets the Author field of the generated images.
RUN	It will execute any commands when Docker image will be created.
CMD	It will execute any commands when Docker container will be executed.
ENTRYPOINT	It will execute any commands when Docker container will be executed.
LABEL	It adds metadata to an image.
EXPOSE	It informs Docker that the container will listen on the specified network ports at runtime.
ENV	It sets the environment variable.
ADD	It copies new files, directories or remote file URLs.
COPY	It copies new files or directories. The differences of [ADD] are that it's impossible to specify remote URL and also it will not extract archive files automatically.
VOLUME	It creates a mount point with the specified name and marks it as holding externally mounted volumes from native host or other containers.
USER	It sets the user name or UID.
WORKDIR	It sets the working directory.

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