Podman : Use Dockerfile2021/07/29

	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 docker.io/rockylinux/rockylinux
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/rocky-nginx:latest .

STEP 1: FROM docker.io/rockylinux/rockylinux
STEP 2: MAINTAINER ServerWorld <admin@srv.world>
--> 32cbb164a44
STEP 3: RUN dnf -y install nginx

.....
.....

STEP 6: CMD ["/usr/sbin/nginx", "-g", "daemon off;"]
STEP 7: COMMIT srv.world/rocky-nginx:latest
--> 35c58055062
35c580550628a2e4e5633d59b6bec8a57423acc525b5eb8a8f3bb071898ea840

[root@dlp ~]#

podman images

REPOSITORY                       TAG     IMAGE ID      CREATED         SIZE
srv.world/rocky-nginx            latest  35c580550628  23 seconds ago  340 MB
srv.world/rocky-httpd            latest  bb62279be7bd  9 minutes ago   342 MB
docker.io/rockylinux/rockylinux  latest  333da17614b6  5 weeks ago     234 MB

# run container

[root@dlp ~]#

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

5d6a1232d35ac7e365c7fa54dce45de688d1b60040db802d10bf3a98edee0a31

[root@dlp ~]#

podman ps

CONTAINER ID  IMAGE                  COMMAND               CREATED        STATUS            PORTS               NAMES
5d6a1232d35a  srv.world/rocky-nginx  /usr/sbin/nginx -...  6 seconds ago  Up 7 seconds ago  0.0.0.0:80->80/tcp  goofy_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	iIt 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 remore 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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