Run Containers in RHEL - RHCSA (RH134).pdf
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The document discusses the concept of containers in software, tracing their origins to shipping containers and their standardized design for global transport. It details various container management tools, particularly focusing on Podman and its functionalities, commands, and comparison to Docker. Additionally, it lists commands for installing Podman, managing images, and running containerized applications.
Run Containers in RHEL - RHCSA (RH134).pdf
- 2. Container ● From shipping containers, the concept of 'container' began. ● Travel globally with consistent measurements. ● Global infrastructure easily handles these standardized containers. ● Resulting in universal ease of transportation and storage.
- 4. Lightweight, portable units of software that package code and dependencies together What are containers?
- 5. Container Softwares Released on: March 20th 2013 Released on: August 2018 Developed by : Solomon Hykes Developed by :
- 6. Docker vs Podman Docker Podman Support in RHEL 8 Not Supported by RHEL 8 An alternative to Docker in RHEL 8 Service Management Controlled through native Linux service management tools Utilizes native Linux service management tools Daemon Uses a daemon (background process) Runs as a user process (no daemon) Rootless Requires root privileges Supports rootless mode Security Relies on containerd and runc Uses its own libraries for container management Compatibility Works well across various operating systems Primarily designed for Linux systems Image formats Uses Docker image format Supports multiple image formats including Docker
- 7. ● Podman: Manages pods and containers (run, stop, start, etc.) ● Buildah: Builds, pushes, and signs container images ● Skopeo: Copies, inspects, deletes, and signs images ● runc: Provides run and build features for Podman and Buildah ● crun: Optional runtime offering flexibility and security for rootless containers. Red Hat CLI tools
- 9. Podman Container Terms ● Images: Templates used to create containers, which can be converted back to images ● Pods: Groups of containers deployed together on a host, symbolized by the three seals in the Podman logo
- 10. Podman commands Install podman on rhel ● Command : dnf install podman-y Check podman version ● Command : podman version
- 11. To get info about all commands in podman ● Command : podman help
- 12. Get detailed information about the Podman env., including the system conf, runtime information, and other relevant details ● Command : podman info
- 13. On scrolling down in podman info you’ll get what all registry it is using
- 14. Configuration file specifying container image registries for Podman ● Command : cat /etc/containers/registries.conf
- 15. Search image in registries ● Command : podman search httpd
- 16. Display Logs Of Recently Created Containers ● Command : podman logs-l
- 17. Download the amd64 Version of the httpd Image from Docker Hub ● Command : podman pull docker.io/amd/httpd
- 18. Download the Default httpd Image from Docker Hub ● Command: podman pull httpd
- 19. List All Available Images on Your Local System ● Command: podman images Removes The Specified Image ● Command : podman rmi docker.io/amd64/httpd
- 20. Run an httpd Container and Expose it on Port 8080 ● Command:podman run-d-p 8080:80/tcp--name http_container httpd Run an Interactive httpd Container and Expose it on Port 8081 ● Command: podman run-it-p 8081:80/tcp--name 2_http_container httpd
- 21. List All Running Containers ● Command: podman ps List All Containers (Running and Stopped) ● Command:podman ps-a
- 22. Stop a running container ● Command: podman stop http_container
- 23. Start a Stopped Container ● Command: podman start http_container
- 24. Remove a Container ● Command: podman rm http_container
- 25. View Logs of a Container ● Command: podman logs http_container
- 26. Access a Running Container's Shell ● Command: podman exec-it http_container /bin/bash
- 27. Inspect a Container's Details ● Command: podman inspect http_container