Podman : Use Dockerfile2024/11/06

	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>
--> 3caa69e6a0a2
STEP 3/6: RUN dnf -y install nginx
.....
.....
Successfully tagged srv.world/fedora-nginx:latest
cb2e14e1465e67ed5ec241c7bcae60123a5f87d2f98775fd2340e1dc81acf810

[root@dlp ~]#

podman images

REPOSITORY                         TAG         IMAGE ID      CREATED         SIZE
srv.world/fedora-nginx             latest      cb2e14e1465e  32 seconds ago  316 MB
srv.world/fedora-httpd             latest      4dfbd95b4ef6  6 minutes ago   319 MB
registry.fedoraproject.org/fedora  latest      99519fcf3c1b  17 hours ago    163 MB

# run container

[root@dlp ~]#

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

b363dc0de6731ea9b8e067584663ed7f102c3bfc55f2d1e31f64a574393f378e

[root@dlp ~]#

podman ps

CONTAINER ID  IMAGE                          COMMAND               CREATED         STATUS         PORTS                       NAMES
b363dc0de673  srv.world/fedora-nginx:latest  /usr/sbin/nginx -...  14 seconds ago  Up 15 seconds  0.0.0.0:80->80/tcp, 80/tcp  goofy_shamir

# 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.
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.

Matched Content