Manage containers

Question 1

how to search for container image from a specific registry

Answer 1

podman search –no-truncregistry.access.redhat.com/rhel8

–no-trunc gives more detailed information about the image

Question 2

how to search for a container image

Answer 2

podman search rhel8

Question 3

how to get the current container image from a specific repository

Answer 3

podman pull registry.access.redhat.com/ubi8/ubi:latest

registry_name/user_name/image_name:tag

Question 4

where is the config file that podman uses to keep track of registries

Answer 4

/etc/containers/registries.conf

Question 5

what command will display the current configuration for podman

Answer 5

podman info

Question 6

how to inspect container image using podman

Answer 6

podman inspect registry.redhat.io/rhel8/python-36

Question 7

how to inspect container image using skopeo

Answer 7

skopeo inspect docker://registry.redhat.io/rhel8/python-36

Question 8

how to list all the container images on the system

Answer 8

podman images

Question 9

how to remove a specific container image

Answer 9

podman rmi registry.redhat.io/rhel8/python-36:latest

Question 10

how to view all current running containers

Answer 10

podman ps

Question 11

how to view all containers that are either running or died

Answer 11

podman ps -a

Question 12

how to remove a specific container

Answer 12

podman rm httpd-24

Question 13

how to kill a running container

Answer 13

podman kill -s SIGKILL httpd-24

Question 14

how to run a container image in the background with a specified name and port forwarding

Answer 14

podman run -d -p 8000:8080 –name=httpd-24 registry.redhat.io/rhel8/httpd-24

Question 15

how to restart a container

Answer 15

podman restart httpd-24

Question 16

how to stop a container

Answer 16

podman stophttpd-24

Question 17

how to get a bash shell in a running container

Answer 17

podman exec -it my_webserver /bin/bash

Question 18

how to attach persistent storage to a container

Answer 18

podman run -d –name mydb -v /home/user/dbfiles:/var/lib/mysql:Z registry.redhat.io/rhel8/mariadb:latest

-v /folder/file/location/on/system:/location/in/container:Z (Z automatically applies the SELinux container_file_t context type)

Question 19

how to configured a container to start on bootup running as a user (not root)

Answer 19

loginctl enable-linger
podman run -d –name web registry.redhat.io/rhel8/httpd-24:latest
podman generate systemd –name web –files –new
cp container-web.service ~/.config/systemd/user/
systemctl –user daemon-reload
systemctl –user enable myapp.service
systemctl –user start myapp.service

Question 20

how to configure a container to start on bootup (can be as root)

Answer 20

podman run -d –name web registry.redhat.io/rhel8/httpd-24:latest
podman generate systemd –name web –files –new
cp container-web.service /etc/systemd/system/
systemctl daemon-reload
systemctl enable myapp.service
systemctl start myapp.service

Question 21

how to start a container (not image)

Answer 21

podman start httpd-24