Podman : Use Dockerfile2025/11/12

	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
LABEL 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>
--> bca13024dc95
STEP 3/6: RUN dnf -y install nginx
.....
.....
Successfully tagged srv.world/fedora-nginx:latest
78a532c42789b92b08a0d3450ab09918ac9f78dfcbd5e0725c2dc243dc02fdd1

[root@dlp ~]#

podman images

REPOSITORY                         TAG         IMAGE ID      CREATED         SIZE
srv.world/fedora-nginx             latest      78a532c42789  37 seconds ago  346 MB
srv.world/fedora-httpd             latest      9681aa9061c7  7 minutes ago   349 MB
registry.fedoraproject.org/fedora  latest      a9005aba99b1  2 days ago      186 MB

# run container

[root@dlp ~]#

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

dde97be465c515ef6813ba70cf9fb6e1e4015b375013f8d7fa1faf01dcacb6b0

[root@dlp ~]#

podman ps

CONTAINER ID  IMAGE                          COMMAND               CREATED         STATUS         PORTS               NAMES
dde97be465c5  srv.world/fedora-nginx:latest  /usr/sbin/nginx -...  16 seconds ago  Up 17 seconds  0.0.0.0:80->80/tcp  pedantic_wilson

# 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": "10.88.0.10",

[root@dlp ~]#

curl 10.88.0.10

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.
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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