Podman : Use Dockerfile2025/04/25

	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 fedora
MAINTAINER ServerWorld <admin@srv.world>

RUN dnf -y install nginx
RUN echo "Dockerfile Test on Nginx" > /usr/share/nginx/html/index.html

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

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

[root@dlp ~]#

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

STEP 1/6: FROM fedora
STEP 2/6: MAINTAINER ServerWorld <admin@srv.world>
--> 8ba0796d094e
STEP 3/6: RUN dnf -y install nginx
.....
.....
Successfully tagged srv.world/fedora-nginx:latest
ad26e76247bd7a02a9ee54a7579c8971255f766a49b211bc7f3ea8a6a2b9b171

[root@dlp ~]#

podman images

REPOSITORY                         TAG         IMAGE ID      CREATED         SIZE
srv.world/fedora-nginx             latest      ad26e76247bd  31 seconds ago  325 MB
srv.world/fedora-httpd             latest      512d39041a55  8 minutes ago   328 MB
registry.fedoraproject.org/fedora  latest      e5bf03515e92  22 hours ago    166 MB

# run container

[root@dlp ~]#

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

110ee53f0546342c437c65b5b8167fef0912f7010787b621f2380fdf15a704d2

[root@dlp ~]#

podman ps

CONTAINER ID  IMAGE                          COMMAND               CREATED        STATUS        PORTS               NAMES
110ee53f0546  srv.world/fedora-nginx:latest  /usr/sbin/nginx -...  5 minutes ago  Up 5 minutes  0.0.0.0:80->80/tcp  adoring_gauss

# 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": "10.88.0.10",
                         "IPAddress": "10.88.0.6",

[root@dlp ~]#

curl 10.88.0.6

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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