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Podman : Use Dockerfile2024/05/03

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

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>
--> 5e070e0d7ffc
STEP 3/6: RUN dnf -y install nginx
Successfully tagged srv.world/fedora-nginx:latest

[root@dlp ~]#
podman images

REPOSITORY                         TAG         IMAGE ID      CREATED         SIZE
srv.world/fedora-nginx             latest      cf5af4219b13  34 seconds ago  340 MB
srv.world/fedora-httpd             latest      9d6d273370e2  11 minutes ago  343 MB
registry.fedoraproject.org/fedora  latest      19f52f582331  57 minutes ago  229 MB

# run container

[root@dlp ~]#
podman run -d -p 80:80 srv.world/fedora-nginx


[root@dlp ~]#
podman ps

CONTAINER ID  IMAGE                          COMMAND               CREATED         STATUS         PORTS               NAMES
ee6c14b34b70  srv.world/fedora-nginx:latest  /usr/sbin/nginx -...  18 seconds ago  Up 18 seconds>80/tcp  flamboyant_almeida

# 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": "",
                         "IPAddress": "",

[root@dlp ~]#

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