CLI

Docker CLI commands - epic cheat sheet

Basic §

• docker info - display system info
• docker version - display system’s version
• docker login - login to Docker registry

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Running and Stopping §

• docker pull [imagename] - pull image from registry
• docker run [imagename] - run containers
• docker run -d [imagename] - detached mode
• docker start [containername] - start stopped containers
• docker ps - list running containers
• docker ps -a - list all (running and stopped) containers
• docker stop [containername] - stop container
• docker kill [containername] - kill container
• docker image inspect [imagename] - get image info

Difference between image name and container name?

Image name is the name of the image in the container registry. While container name is the name of the running instance of the docker image.

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Set limits §

• docker run —memory=“256m” nginx - set memory for a container
• docker run —cpus=“.5” nginx - set cpu for a container

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Attach shell §

• docker run -it nginx — /bin/bash - Attach shell
• docker run -it nginx — microsoft/powershell:nanoserver pwsh.exe - Attach powershell
• docker container exec -it [containername] bash - Attach to a running container

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Cleaning up §

• docker rm [containername] - remove stopped containers
• docker rm $(docker ps -a -q) - remove all stopped containers
• docker images - lists images
• docker rmi [imagename] - delete image
• docker system prune -a - remove all images not in use by any container, USE CAREFULLY

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Building §

• docker build -t [name:tag] . - Build an image using a Dockerfile located in ‘./’ (same folder)
• docker build -t [name:tag] -f [fileName] - Build an image using a Dockerfile located in different folder
• docker tag [imagename] [name:tag] - Tag an existing image

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Volume §

• docker create volume [volumeName] - Creates a new volume
• docker volume ls - Lists the volumes
• docker volume inspect [volumeName] - Display the volume info
• docker volume rm [volumeName] - Deletes a volume
• docker volume prune - Delets all volumes not mounted

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Docker compose §

• docker compose build - Build the images specified in YAML file
• docker compose start - Start the containers
• docker compose stop - Stop the containers
• docker compose up -d - Build and start
• docker compose ps - List what’s running
• docker compose rm - Remove from memory
• docker compose down - Stop and remove
• docker compose logs - Get the logs
• docker compose exec [container] bash - Run a command in a container
• docker compose -p [projectName] up -d - Build and run an instance as a project (Allows us to run 2 instances of the same project)
• docker compose ls - List running projects
• docker compose cp [containerID]:[SRC_PATH] [DEST_PATH] - Copy files from the container
• docker compose cp [SRC_PATH] [containerID]:[DEST_PATH] - Copy files to the container

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Kubernetes CLI commands - epic cheat sheet

K8s Context §

• kubectl config current-context - Get the current context
• kubectl config get-contexts - List all context
• kubectl config use-context [contextName] - Set the current context
• kubectl config delete-context [contextName] - Delete a context from the config file

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K8s Namespace §

• kubectl get namespace - List all namespaces
• kubectl get ns - List all namespaces (shortcut)
• kubectl config set-context —current —namespace=[namespaceName] - Set the current context to use a namespace
• kubectl create ns [namespaceName] - Create a namespace
• kubectl delete ns [namespaceName] - Delete a namespace
• kubectl get pods —all-namespace - List all pods in all namespaces

K8s Pods §

• kubectl create -f [pod-definition.yml] - Create a pod
• kubectl run [podname] —image=busybox — /bin/sh -c “sleep 3600” - Run a pod
• kubectl get pods - List the running pods
• kubectl get pods -o wide - List the running pods with detailed info
• kubectl describe pod [podname] - Show pod info
• kubectl get pod [podname] -o yaml > file.yaml - Extract the pod defintion in YAML and save it to a file
• kubectl exec -it [podname] — sh - Interactive mode
• kubectl delete -f [pod-definition.yml] - Delete a pod
• kubectl delete pod [podname] - Delete a pod using pod name

In case of multi-container pods

• kubectl exec -it [podname] -c [containername] — sh - Exec into a container of a pod
• kubectl logs [podname] -c [containername] — Get the logs for a container