Docker - Revision history

Ekaanbj: /* create podman image based on centos 7 */

2026-01-15T12:11:24Z

create podman image based on centos 7

← Older revision		Revision as of 12:11, 15 January 2026
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	podman cp <containerId>:/file/path/in/container/file /host/local/path/file		podman cp <containerId>:/file/path/in/container/file /host/local/path/file
	=create podman image based on centos 7=		=create podman image based on centos 7=
	~~sudo~~ podman run -i -t --name centos7 centos:7 /bin/bash		podman run -i -t --name centos7 centos:7 /bin/bash
	Create image from Dockerfile		=Create image from Dockerfile=
	podman build -t abjorklund/openshift_install .		podman build -t abjorklund/openshift_install .
	List images		=List images=
	podman image ls		podman image ls
	Create container from image. Mount $PWD on /root/src		=Create container from image. Mount $PWD on /root/src=
	podman run --rm -it -v $PWD:/root/src abjorklund/openshift_install		podman run --rm -it -v $PWD:/root/src abjorklund/openshift_install
			=start ubuntu image=
			podman run -i -t --name ubuntu24 ubuntu:24.04 /bin/bash

	=create podman image based on centor 7=		=create podman image based on centor 7=

Ekaanbj: /* Start container */

2025-12-18T15:51:32Z

Start container

← Older revision		Revision as of 15:51, 18 December 2025
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	==Start container==		==Start container==
	podman run -d --name gitolite-server -p 2222:22 -v gitolite_data:/var/lib/gitolite3 --restart unless-stopped ~~<image_id>~~		podman run -d --name gitolite-server -p 2222:22 -v gitolite_data:/var/lib/gitolite3 --restart unless-stopped localhost/gitolite:latest

Ekaanbj: /* Build image */

2025-12-18T15:50:57Z

Build image

← Older revision		Revision as of 15:50, 18 December 2025
Line 221:		Line 221:
	</pre>		</pre>
	==Build image==		==Build image==
	podman build -t gitolite .		podman build -t gitolite-server .

	==Start container==		==Start container==
	podman run -d --name gitolite-server -p 2222:22 -v gitolite_data:/var/lib/gitolite3 --restart unless-stopped <image_id>		podman run -d --name gitolite-server -p 2222:22 -v gitolite_data:/var/lib/gitolite3 --restart unless-stopped <image_id>

Ekaanbj: /* Create image */

2025-12-18T15:50:20Z

Create image

← Older revision		Revision as of 15:50, 18 December 2025
Line 220:		Line 220:
	CMD ["/usr/sbin/sshd", "-D"]		CMD ["/usr/sbin/sshd", "-D"]
	</pre>		</pre>
			==Build image==
			podman build -t gitolite .

	==Start container==		==Start container==
	podman run -d --name gitolite-server -p 2222:22 -v gitolite_data:/var/lib/gitolite3 --restart unless-stopped <image_id>		podman run -d --name gitolite-server -p 2222:22 -v gitolite_data:/var/lib/gitolite3 --restart unless-stopped <image_id>

Ekaanbj: /* Create image */

2025-12-18T13:48:20Z

Create image

← Older revision		Revision as of 13:48, 18 December 2025
Line 220:		Line 220:
	CMD ["/usr/sbin/sshd", "-D"]		CMD ["/usr/sbin/sshd", "-D"]
	</pre>		</pre>
			==Start container==
			podman run -d --name gitolite-server -p 2222:22 -v gitolite_data:/var/lib/gitolite3 --restart unless-stopped <image_id>

Ekaanbj: /* Create image */

2025-12-18T13:46:20Z

Create image

← Older revision		Revision as of 13:46, 18 December 2025
Line 196:		Line 196:
	=Create container example=		=Create container example=
	==Create image==		==Create image==
			Dockerfile
	<pre>		<pre>
	~~Dockerfile~~
	FROM ubuntu:24.04		FROM ubuntu:24.04

	ENV DEBIAN_FRONTEND=noninteractive		ENV DEBIAN_FRONTEND=noninteractive

	RUN apt-get update && \		RUN apt-get update && \
	apt-get install -y --no-install-recommends strace debconf-utils git openssh-server less vim dialog libterm-readline-perl-perl && \		apt-get install -y --no-install-recommends strace debconf-utils git openssh-server less vim dialog libterm-readline-perl-perl && \

Ekaanbj: /* disk cleanup */

2025-12-18T13:45:34Z

disk cleanup

← Older revision		Revision as of 13:45, 18 December 2025
Line 194:		Line 194:
	Removes all stopped containers, unused networks, dangling images, unused volumes, and build cache.		Removes all stopped containers, unused networks, dangling images, unused volumes, and build cache.
	docker system prune -a -f --volumes		docker system prune -a -f --volumes
			=Create container example=
			==Create image==
			<pre>
			Dockerfile
			FROM ubuntu:24.04

			ENV DEBIAN_FRONTEND=noninteractive

			RUN apt-get update && \
			apt-get install -y --no-install-recommends strace debconf-utils git openssh-server less vim dialog libterm-readline-perl-perl && \
			# Create gitolite3 user first
			adduser --system --shell /bin/bash --group --home /var/lib/gitolite3 --gecos "gitolite3" gitolite3 && \
			mkdir -p /var/lib/gitolite3/.ssh /var/lib/gitolite3/.gitolite/keydir /var/lib/gitolite3/.gitolite/logs && \
			chown -R gitolite3:gitolite3 /var/lib/gitolite3 && \
			# Create complete admin.pub file
			echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDHm/NIKIl/6eIjLT8GJxva3/zENlQbgofflEvlOe7g3 admin@container" > /var/lib/gitolite3/.gitolite/keydir/admin.pub && \
			chown gitolite3:gitolite3 /var/lib/gitolite3/.gitolite/keydir/admin.pub && \
			chmod 644 /var/lib/gitolite3/.gitolite/keydir/admin.pub && \
			# Pre-seed debconf
			echo 'gitolite3 gitolite3/git-user string gitolite3' \| debconf-set-selections && \
			echo 'gitolite3 gitolite3/adminkey string /var/lib/gitolite3/.gitolite/keydir/admin.pub' \| debconf-set-selections && \
			echo 'gitolite3 gitolite3/admin-pubkey string ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDHm/NIKIl/6eIjLT8GJxva3/zENlQbgofflEvlOe7g3 admin@container' \| debconf-set-selections && \
			apt-get install -y gitolite3 && \
			apt-get clean && rm -rf /var/lib/apt/lists/* && \
			mkdir -p /run/sshd && chmod 755 /run/sshd
			WORKDIR /var/lib/gitolite3
			CMD ["/usr/sbin/sshd", "-D"]
			</pre>

Ekaanbj: /* disk cleanup */

2025-09-05T06:51:12Z

disk cleanup

New page

=install podman on fedora 21=
Step 1: Install podman on Fedora 21
*As a matter of best practice, we’ll update our packages:
yum update -y
*Let’s install podman by installing the docker-io package:
yum -y install docker-io
*Once the installation completes, we’ll need to start the podman daemon:
systemctl start docker
*And finally, and optionally, let’s configure podman to start when the server boots:
systemctl enable docker
*Step 2: Download a podman Container
podman pull marina/fedora21-i386
Step 3: Run a podman Container
basic fedora container with a bash shell, we just run one command. podman run will run a command in a new container, -i attaches stdin and stdout, -t allocates a tty, and we’re using the standard fedora
podman run -i -t marina/fedora21-i386 /bin/bash
connect, or detach, from the shell without exiting use the escape sequence Ctrl-p + Ctrl-q.
sudo podman run -i -t -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix --rm marina/fedora21-i386 /bin/bash

==Update image==
sed -i 's/\$releasever/21/g;s/\$basearch/i386/g' /etc/yum.repos.d/*
yum clean all
yum -y update
yum -y install firefox
yum -y install https://www.halfface.se/jdk-8u40-linux-i586.rpm
alternatives --install /usr/bin/java java /usr/java/latest/jre/bin/java 200000
alternatives --install /usr/bin/javaws javaws /usr/java/latest/jre/bin/javaws 200000
alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /usr/java/latest/jre/lib/i386/libnpjp2.so 200000
alternatives --install /usr/lib64/mozilla/plugins/libjavaplugin.so libjavaplugin.so.x86_64 /usr/java/latest/jre/lib/amd64/libnpjp2.so 200000
ln -sf /usr/java/latest/jre/lib/i386/libnpjp2.so /etc/alternatives/libjavaplugin.so
yum -y install 'xorg-x11-fonts*'
*Search for images.
podman search fedora

==attach container==
List containers.
sudo podman ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
315ea401e287 marina/fedora21-i386:0.1.0 "/bin/bash" About an hour ago Up About an hour elated_nobel
==list all containers==
podman ps -a
podman ps -a --no-trunc

==Connect container==
Reconnect process. When you do CTRL + c it will die.
sudo podman attach 315ea401e287

==list images==
sudo podman images
==delete image==
podman rmi 315ea401e287
==delete container==
podman container rm cc3f2ff51cab cd20b396a061

=Connect to image=
podman exec -it elated_nobel /bin/bash
=logs=
Look at log output from container.
podman logs some-guacamole
podman logs --follow 123141234

=stop=
Stop podman image.
podman stop 7bcf035e1a4e
=start=
Start podman image
podman start 7bcf035e1a4e
=list ip address of container=
podman inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' c7eec987a17b
If you want to see all settings
podman inspect e2f7a7e275d5
=look at mounts=
podman inspect -f ‘{{ .Mounts }}’ 79b9ab19ace0
Guess which container uses which ip.
podman ps 2>&1 | grep -v '^CONTAINER ID' | while read ID THE_REST ; do echo '***' $ID $THE_REST ; podman inspect $ID | grep '"5000"' ; done
=install guacamole=
Create a mysql database.
mysql ...
Start guacd
podman run --name some-guacd -d guacamole/guacd
Start guacamole
CREDS=guacamole ; podman run --name some-guacamole --link some-guacd:guacd -e MYSQL_DATABASE=${CREDS} -e MYSQL_HOSTNAME=172.17.0.1 -e MYSQL_PORT=3306 -e MYSQL_USER=${CREDS} -e MYSQL_PASSWORD=${CREDS} -d -p 8080:8080 guacamole/guacamole
=List images=
podman images

=docker history image_name=
name> will show the layers baked into an image.
podman history $image

=docker version=
Which version of podman are we running.
=docker info=
Information about docker
=docker cp=
Copy file in and out of podman image.
podman cp <containerId>:/file/path/in/container/file /host/local/path/file
=create podman image based on centos 7=
sudo podman run -i -t --name centos7 centos:7 /bin/bash
Create image from Dockerfile
podman build -t abjorklund/openshift_install .
List images
podman image ls
Create container from image. Mount $PWD on /root/src
podman run --rm -it -v $PWD:/root/src abjorklund/openshift_install

=create podman image based on centor 7=
sudo podman run -i -t --name centos7 centos:7 /bin/bash
=Add mount to container=
Commit existing image.
sudo podman commit d3c982e9e73e centos7_2021-04-05_12-33
Add mount to new container
sudo podman run -ti --mount type=bind,source=/opt/autopanopro/,target=/opt/autopanopro/ centos7_2021-04-05_12-33 /bin/bash
=podman where are files stored=
Which image is interesting.
[root@worker-1 ~]# podman ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a1c2397ccd1a registry.redhat.io/rhel8/support-tools:latest /usr/bin/bash 3 months ago Exited (0) 2 months ago toolbox-root
6782eb51bb24 registry.redhat.io/rhel8/support-tools:latest /usr/bin/bash 3 months ago Exited (0) 22 minutes ago toolbox-core
3a11d6bb76c9 registry.redhat.io/rhel8/support-tools:latest /usr/bin/bash 5 months ago Exited (0) 5 months ago toolbox-
Where are files stored.
[root@worker-1 ~]# podman inspect 6782eb51bb24 | grep 02a2f9b0010d4232445bb8bbc42ac4848e3c768e814849c711c19685bd2f46ac
"UpperDir": "/var/lib/containers/storage/overlay/02a2f9b0010d4232445bb8bbc42ac4848e3c768e814849c711c19685bd2f46ac/diff",
"WorkDir": "/var/lib/containers/storage/overlay/02a2f9b0010d4232445bb8bbc42ac4848e3c768e814849c711c19685bd2f46ac/work"

=docker login halfface.se=
Log in to a podman registry.
podman login halfface.se
=autostart=
Make all podman images autostart.
podman update --restart unless-stopped $(docker ps -q)
=become root=
podman exec -it --user 0 8346d5e8df67e96e1df5ebd50cd4d526fa066a07e274e76ae3ddf7dbf7e30f6a /bin/bash
=inspect=
Describe
podman inspect minio_minio1_1
=docker-compose pull=
Pulls an image associated with a service defined in a docker-compose.yml, docker-compose.override.yml or docker-stack.yml file, but does not start containers based on those images.
docker-compose pull

=docker-compose up=
Bring up podman containers in detached mode.
docker-compose up -d
=update variable=
Find Container id.
podman ps -a --no-trunc
stop podman daemon and change container config in
/var/lib/docker/containers/[container-id]/config.json
Start container.
=set proxy=
mkdir -p /etc/systemd/system/docker.service.d/
echo '[Service]
Environment="HTTP_PROXY=http://proxy.int.redbridge.se:3128"
Environment="HTTPS_PROXY=http://proxy.int.redbridge.se:3128"
Environment="NO_PROXY=localhost,127.0.0.1"
' > /etc/systemd/system/docker.service.d/proxy.conf
systemctl daemon-reload
systemctl restart docker
=push container to docker.io=
# login to where your container should reside. And create repository. In this example halfface/rockylinux-toolbox on docker.io.
...
# Create Dockerfile that describe your wanted state.
# Specify the parent image from which we build
FROM rockylinux/rockylinux:9
# Prepare container to suite your needs.
RUN dnf -y install procps-ng iproute bind-utils && dnf clean all
...
# Clear crap from your local podman environment.
podman system prune -a -f
# Create container
podman build -t rockylinux-toolbox:v1 .
# Login to docker.io
podman login -u anden@halfface.se docker.io
# Tag image
podman tag localhost/rockylinux-toolbox:v1 halfface/rockylinux-toolbox:v1
# Push container to docker.io/halfface/rockylinux-toolbox
podman push halfface/rockylinux-toolbox:v1
# Now you can start to use you container.

=Search for tags.=
podman search --list-tags rb-dreg03.int.redbridge.se/docker-common-env/rockylinux-9-common-env --limit 40
=Run the container as $USER who has uid/gid 1111 on a hostname container-${HOSTNAME}.=
podman run --user $USER --uidmap 1111:0:1 --uidmap 0:1:1111 -it -v $HOME:$HOME -h container-${HOSTNAME} rb-dreg03.int.redbridge.se/docker-common-env/rockylinux-9-common-env:latest
=troubleshooting container=
Network
github.com/nicolaka/netshoot
fedora:40
=skopeo=
Investigate container
skopeo inspect docker://docker.io/halfface/rockylinux-toolbox:latest | jq . | less
=list remote containers=
podman search 203144576027.dkr.ecr.eu-north-1.amazonaws.com/
=disk cleanup=
Where is storage spent
docker system df -v
Removes all stopped containers, unused networks, dangling images, unused volumes, and build cache.
docker system prune -a -f --volumes