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Create a service for the replication controller specified in "python-controller.yaml" file
Command: ```bash kubectl expose -f python-controller.yaml --port=9090 --target-port=8000 ``` What it does: Expose a resource as a new Kubernetes service. Looks up a deployment, service, replica set, replication controller or pod by name and uses the selector for that resource as the selector for a new service on the s...
Create a pod disruption budget named load-balancer-pdb that selects all frontend pods and requires at least four of them to be available at all times.
Command: ```bash kubectl create poddisruptionbudget load-balancer-pdb --selector=tier=frontend --min-available=4 ``` What it does: Create a pod disruption budget with the specified name, selector, and desired minimum available pods. Syntax: `kubectl create poddisruptionbudget NAME --selector=SELECTOR --min-available=...
Create a copy of the 'chat-app-pod' pod, adding a debug container and changing the container images
Command: ```bash kubectl debug chat-app-pod -it --copy-to=dgb-img --image=debian --set-image=logger=logging-app:debug,mailer=mailer:latest ``` What it does: Debug cluster resources using interactive debugging containers. 'debug' provides automation for common debugging tasks for cluster objects identified by resource ...
Embed the certificate authority data for the "on-prem-cluster" cluster entry
Command: ```bash kubectl config set-cluster on-prem-cluster --embed-certs --certificate-authority=~/.kube/star-cluster/kubernetes.ca.crt ``` What it does: Set a cluster entry in kubeconfig. Specifying a name that already exists will merge new fields on top of existing values for those fields. Syntax: `kubectl config ...
Scale the deployment named api-service-rs to have 3 replicas
Command: ```bash kubectl scale --current-replicas=1 --replicas=3 deployment/api-service-rs ``` What it does: Set a new size for a deployment, replica set, replication controller, or stateful set. Scale also allows users to specify one or more preconditions for the scale action. If --current-replicas or --resource-vers...
Listen on port 6379 on all addresses and forward the traffic to port 8080 in the pod named 'backend-pod'.
Command: ```bash kubectl port-forward --address 0.0.0.0 pod/backend-pod 6379:8080 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, a pod will ...
Create an ingress named 'www-ingress' that routes requests from website.com/input to svc1:8000 with TLS certificate 'my-cert'
Command: ```bash kubectl create ingress www-ingress --rule="website.com/input=svc1:8000,tls=my-cert" ``` What it does: Create an ingress with the specified name. Syntax: `kubectl create ingress NAME --rule=host/path=service:port[,tls[=secret]]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage"...
Create a copy of the mypod pod with a debug container and changing the container images of mailer to mailer:latest and logger to logging-app:debug
Command: ```bash kubectl debug mypod -it --copy-to=dgb-img --image=debian --set-image=mailer=mailer:latest,logger=logging-app:debug ``` What it does: Debug cluster resources using interactive debugging containers. 'debug' provides automation for common debugging tasks for cluster objects identified by resource and nam...
Update the node 'gpu-node-12' by adding a taint with the key 'cpu-type', value 'x86', and effect 'NoSchedule'
Command: ```bash kubectl taint nodes gpu-node-12 cpu-type=x86:NoSchedule ``` What it does: Update the taints on one or more nodes. Syntax: `kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Output format. One ...
Forward local port 3000 to port 8080 in a pod selected by the 'monitoring-stack-deployment' deployment.
Command: ```bash kubectl port-forward deployment/monitoring-stack-deployment 3000 8080 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, a pod ...
Create a new NodePort service named backend-nodeport that maps port 5000 on the host to port 3306 on the backend
Command: ```bash kubectl create service nodeport backend-nodeport --tcp=5000:3306 ``` What it does: Create a NodePort service with the specified name. Syntax: `kubectl create service nodeport NAME [--tcp=port:targetPort] [--dry-run=server|client|none]` Helpful flags: "flag": "--output", "short": "-o", "default": "",...
Create a deployment named gateway using the ubuntu image
Command: ```bash kubectl create deployment gateway --image=ubuntu ``` What it does: Create a deployment with the specified name. Syntax: `kubectl create deployment NAME --image=image -- [COMMAND] [args...]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Output format. One of: json|yaml|na...
Forward port 9090 from the pod to localhost and IP 10.19.21.23
Command: ```bash kubectl port-forward --address localhost,10.19.21.23 pod/e-commerce-pod 9090:9090 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the crit...
Listen on your local machine's port 9090 and forward it to port 8088 in the frontend-pod pod
Command: ```bash kubectl port-forward pod/frontend-pod 9090:8088 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, a pod will be selected autom...
Forward traffic from port 8080 on localhost and IP address 10.19.21.23 to port 8081 in the 'security-service-pod' pod.
Command: ```bash kubectl port-forward --address localhost,10.19.21.23 pod/security-service-pod 8080:8081 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching th...
Create an ingress with multiple hosts and the pathType set to Prefix
Command: ```bash kubectl create ingress ingress1 --class=default \ --rule="foo.com/path*=svc:7000" \ --rule="input.com/admin*=svc2:http" ``` What it does: Create an ingress with the specified name. Syntax: `kubectl create ingress NAME --rule=host/path=service:port[,tls[=secret]]` Helpful flags: "flag": "--output", "...
Return the snapshot logs from the container 'analytics-pod-1' of the 'search-engine-deployment' deployment
Command: ```bash kubectl logs deployment/search-engine-deployment -c analytics-pod-1 ``` What it does: Print the logs for a container in a pod or specified resource. If the pod has only one container, the container name is optional. Syntax: `kubectl logs [-f] [-p] (POD | TYPE/NAME) [-c CONTAINER]` Helpful flags: "fl...
Create an ingress named 'app1-ingress' that routes requests to website.com/input to the service 'svc1' on port 3001
Command: ```bash kubectl create ingress app1-ingress --rule="website.com/input=svc1:3001,tls=my-cert" ``` What it does: Create an ingress with the specified name. Syntax: `kubectl create ingress NAME --rule=host/path=service:port[,tls[=secret]]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage...
Import the 'api_key' key from the 'kube-system-config' config map into the 'user-management-deployment' deployment.
Command: ```bash kubectl set env --keys=api_key --from=configmap/kube-system-config deployment/user-management-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable def...
Describe a resource specified in a YAML file
Command: ```bash kubectl describe -f params.json ``` What it does: Show details of a specific resource or group of resources. Print a detailed description of the selected resources, including related resources such as events or controllers. You may select a single object by name, all objects of that type, provide a na...
Create a new config map named monitoring-config using the specified keys and files
Command: ```bash kubectl create configmap monitoring-config --from-file=settings=/path/to/profiles/file1.txt --from-file=key2=/path/to/configs/file2.txt ``` What it does: Create a config map based on a file, directory, or specified literal value. A single config map may package one or more key/value pairs. When creati...
Create a new ClusterIP service named "catalog-service-clusterip" with TCP port mapping from 8083 to 8088.
Command: ```bash kubectl create service clusterip catalog-service-clusterip --tcp=8083:8088 ``` What it does: Create a ClusterIP service with the specified name. Syntax: `kubectl create service clusterip NAME [--tcp=<port>:<targetPort>] [--dry-run=server|client|none]` Helpful flags: "flag": "--output", "short": "-o"...
Import the REDIS_HOST key from the config map named "kube-system-config" into the deployment named "payment-processor-deployment"
Command: ```bash kubectl set env --keys=REDIS_HOST --from=configmap/kube-system-config deployment/payment-processor-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variabl...
Add a taint with the key 'app' and value 'worker-node-3:PreferNoSchedule' on nodes having the label 'service=auth'.
Command: ```bash kubectl taint node -l service=auth app=worker-node-3:PreferNoSchedule ``` What it does: Update the taints on one or more nodes. Syntax: `kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Outp...
Create a deployment named "nats" using the "node" image
Command: ```bash kubectl create deployment nats --image=node ``` What it does: Create a deployment with the specified name. Syntax: `kubectl create deployment NAME --image=image -- [COMMAND] [args...]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Output format. One of: json|yaml|name|go...
Update the node 'backup-node-14' by adding a taint with key 'cpu-type' and value 'x86' and effect 'NoSchedule'
Command: ```bash kubectl taint nodes backup-node-14 cpu-type=x86:NoSchedule ``` What it does: Update the taints on one or more nodes. Syntax: `kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Output format. O...
Create a new secret named monitoring-credentials-secret in the default namespace
Command: ```bash kubectl create secret generic monitoring-credentials-secret --from-file=ssh-privatekey=path/to/id_rsa --from-literal=passphrase=topsecret ``` What it does: Create a secret based on a file, directory, or specified literal value. A single secret may package one or more key/value pairs. When creating a s...
Open a raw terminal to interact with the cosmic-container in the security-service-pod.
Command: ```bash kubectl attach security-service-pod -c cosmic-container -i -t ``` What it does: Attach to a process that is already running inside an existing container. Syntax: `kubectl attach (POD | TYPE/NAME) -c CONTAINER` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "Container na...
Set a custom TLS server name for the cluster-gamma entry in the kubeconfig file.
Command: ```bash kubectl config set-cluster cluster-gamma --tls-server-name=data-cluster ``` What it does: Set a cluster entry in kubeconfig. Specifying a name that already exists will merge new fields on top of existing values for those fields. Syntax: `kubectl config set-cluster NAME [--server=server] [--certificat...
Create a new secret named private-key-secret using the files in the path/to/configurations folder
Command: ```bash kubectl create secret generic private-key-secret --from-file=path/to/configurations ``` What it does: Create a secret based on a file, directory, or specified literal value. A single secret may package one or more key/value pairs. When creating a secret based on a file, the key will default to the bas...
Create a copy of the "mypod" pod and add a debug container, while changing container images.
Command: ```bash kubectl debug mypod -it --copy-to=my-debugger --image=debian --set-image=proxy=nginx:1.21,proxy=nginx:1.21 ``` What it does: Debug cluster resources using interactive debugging containers. 'debug' provides automation for common debugging tasks for cluster objects identified by resource and name. Pods ...
Import specific keys from a config map into a deployment's environment variables.
Command: ```bash kubectl set env --keys=log_level --from=configmap/api-config deployment/frontend-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable definitions in o...
Partially update a node by applying a strategic merge patch in JSON format
Command: ```bash kubectl patch node dev-node-4 -p '{"spec":{"containers":[{"name":"container-name", "resources":{"limits":{"cpu":"200m"}}}]}' ``` What it does: Update fields of a resource using strategic merge patch, a JSON merge patch, or a JSON patch. JSON and YAML formats are accepted. Syntax: `kubectl patch (-f F...
Set the cluster field in the prod-context context to edge-cluster.
Command: ```bash kubectl config set contexts.prod-context.cluster edge-cluster ``` What it does: Set an individual value in a kubeconfig file. PROPERTY_NAME is a dot delimited name where each token represents either an attribute name or a map key. Map keys may not contain dots. PROPERTY_VALUE is the new value you wan...
Forward traffic from port 8888 on your local machine and IP 10.19.21.23 to port 8888 in the pod named "chat-app-pod".
Command: ```bash kubectl port-forward --address localhost,10.19.21.23 pod/chat-app-pod 8888:8888 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criter...
Create a new secret named 'docker-registry-secret' from the environment variables defined in the 'path/to/parameters.env' file
Command: ```bash kubectl create secret generic docker-registry-secret --from-env-file=path/to/parameters.env ``` What it does: Create a secret based on a file, directory, or specified literal value. A single secret may package one or more key/value pairs. When creating a secret based on a file, the key will default to...
Delete the pods and services with the names "backend" and "auth"
Command: ```bash kubectl delete pod,service backend auth ``` What it does: Delete resources by file names, stdin, resources and names, or by resources and label selector. JSON and YAML formats are accepted. Only one type of argument may be specified: file names, resources and names, or resources and label selector. So...
Create a deployment named nats running the centos image and exposing port 8084
Command: ```bash kubectl create deployment nats --image=centos --port=8084 ``` What it does: Create a deployment with the specified name. Syntax: `kubectl create deployment NAME --image=image -- [COMMAND] [args...]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Output format. One of: jso...
Create an ingress that directs requests from testing.com/example to svc1:9092 with a tls secret named "my-cert"
Command: ```bash kubectl create ingress public-service-ingress --rule="testing.com/example=svc1:9092,tls=my-cert" ``` What it does: Create an ingress with the specified name. Syntax: `kubectl create ingress NAME --rule=host/path=service:port[,tls[=secret]]` Helpful flags: "flag": "--output", "short": "-o", "default"...
Forward local traffic on port 8081 to port 3000 in the pod named "analytics-pod"
Command: ```bash kubectl port-forward pod/analytics-pod 8081:3000 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, a pod will be selected auto...
List the deployments in YAML output format for the "internal-apps" API group with a version of "dev-2.2.0"
Command: ```bash kubectl get deployments.dev-2.2.0.internal-apps -o yaml ``` What it does: Display one or many resources. Prints a table of the most important information about the specified resources. You can filter the list using a label selector and the --selector flag. If the desired resource type is namespaced yo...
Create a cluster role named "view" with the "list", "create", and "connect" verbs on the "pods" resource, and its "status" subresource.
Command: ```bash kubectl create clusterrole view --verb=list,create,connect --resource=pods,pods/status ``` What it does: Create a cluster role. Syntax: `kubectl create clusterrole NAME --verb=verb --resource=resource.group [--resource-name=resourcename] [--dry-run=server|client|none]` Helpful flags: "flag": "--outp...
Taint nodes with label 'team=devops' using taint key 'zone' and value 'backup-node-14' with the effect of 'PreferNoSchedule'
Command: ```bash kubectl taint node -l team=devops zone=backup-node-14:PreferNoSchedule ``` What it does: Update the taints on one or more nodes. Syntax: `kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Out...
Create an ingress called 'app2-ingress' that directs requests to a specific path and service, with a tls secret.
Command: ```bash kubectl create ingress app2-ingress --rule="testing.com/input=svc1:3306,tls=my-cert" ``` What it does: Create an ingress with the specified name. Syntax: `kubectl create ingress NAME --rule=host/path=service:port[,tls[=secret]]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage...
Retrieve information about the 'web' replication controller, 'chat-app' service, and 'chat-app' pod.
Command: ```bash kubectl get rc/web service/chat-app-rc pods/chat-app-pod ``` What it does: Display one or many resources. Prints a table of the most important information about the specified resources. You can filter the list using a label selector and the --selector flag. If the desired resource type is namespaced y...
Forward local port 8888 to port 8088 in the log-aggregator-pod and also forward local port 6000 to port 6000 in the log-aggregator-pod
Command: ```bash kubectl port-forward pod/log-aggregator-pod 8888 8088 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, a pod will be selected...
Start a Ubuntu pod called "hazelcast" and configure the container to expose port 8888.
Command: ```bash kubectl run hazelcast --image=ubuntu --port=8888 ``` What it does: Create and run a particular image in a pod. Syntax: `kubectl run NAME --image=image [--env="key=value"] [--port=port] [--dry-run=server|client] [--overrides=inline-json] [--command] -- [COMMAND] [args...]` Helpful flags: "flag": "--f...
Get the output from running the 'redis-server' command in the 'cyber-sleuth' container of the 'frontend-pod' pod.
Command: ```bash kubectl exec frontend-pod -c cyber-sleuth -- redis-server ``` What it does: Execute a command in a container. Syntax: `kubectl exec (POD | TYPE/NAME) [-c CONTAINER] [flags] -- COMMAND [args...]` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "Container name. If omitted,...
Set the cluster field in the app-1-context context to moon-cluster
Command: ```bash kubectl config set contexts.app-1-context.cluster moon-cluster ``` What it does: Set an individual value in a kubeconfig file. PROPERTY_NAME is a dot delimited name where each token represents either an attribute name or a map key. Map keys may not contain dots. PROPERTY_VALUE is the new value you wa...
Set up basic authentication credentials for the "app-operator" entry
Command: ```bash kubectl config set-credentials app-operator --username=admin --password=uXFGweU9l35qcif ``` What it does: Set a user entry in kubeconfig. Specifying a name that already exists will merge new fields on top of existing values. Client-certificate flags: --client-certificate=certfile --client-key=keyfil...
Use notepad as the editor to edit the authentication-service service
Command: ```bash KUBE_EDITOR="notepad" kubectl edit svc/authentication-service ``` What it does: Edit a resource from the default editor. The edit command allows you to directly edit any API resource you can retrieve via the command-line tools. It will open the editor defined by your KUBE_EDITOR, or EDITOR environment...
Set the custom TLS server name for the my-k8s-cluster cluster entry to "prod-cluster" using the command "kubectl config set-cluster my-k8s-cluster --tls-server-name=prod-cluster"
Command: ```bash kubectl config set-cluster my-k8s-cluster --tls-server-name=prod-cluster ``` What it does: Set a cluster entry in kubeconfig. Specifying a name that already exists will merge new fields on top of existing values for those fields. Syntax: `kubectl config set-cluster NAME [--server=server] [--certifica...
Import specific keys from a ConfigMap to an environment variable in a deployment
Command: ```bash kubectl set env --keys=my-example-key --from=configmap/ui-config deployment/log-aggregator-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable defini...
Create a cron job named "data-sync" with a schedule of running every minute and the command "redis-cli" using the Redis image.
Command: ```bash kubectl create cronjob data-sync --image=redis --schedule="*/1 * * * *" -- redis-cli ``` What it does: Create a cron job with the specified name. Syntax: `kubectl create cronjob NAME --image=image --schedule='0/5 * * * ?' -- [COMMAND] [args...]` Helpful flags: "flag": "--output", "short": "-o", "def...
Forward traffic between local port 8888 and pod port 5432 for the 'authentication-service-deployment' deployment
Command: ```bash kubectl port-forward deployment/authentication-service-deployment 8888 5432 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, ...
Add or update a taint on a node with key "disktype", value "ssd", and effect "NoSchedule"
Command: ```bash kubectl taint nodes db-node-7 disktype=ssd:NoSchedule ``` What it does: Update the taints on one or more nodes. Syntax: `kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Output format. One of...
Add a taint with key 'environment' on nodes having label instance=app-instance-1 with the value 'PreferNoSchedule', specifically on the node with label environment=storage-node-13.
Command: ```bash kubectl taint node -l instance=app-instance-1 environment=storage-node-13:PreferNoSchedule ``` What it does: Update the taints on one or more nodes. Syntax: `kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N` Helpful flags: "flag": "--output", "short": "-o", "default...
Import specific keys from a config map into a deployment's environment variables.
Command: ```bash kubectl set env --keys=LOG_LEVEL --from=configmap/app-config-dev deployment/cache-cluster-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable definit...
Create a new ClusterIP service called my-cs, which will map port 7000 of the service to port 9091 of the pods
Command: ```bash kubectl create service clusterip my-cs --tcp=7000:9091 ``` What it does: Create a ClusterIP service with the specified name. Syntax: `kubectl create service clusterip NAME [--tcp=<port>:<targetPort>] [--dry-run=server|client|none]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "us...
Display the modified YAML file of the "database-deployment" deployment with the environment variable "JWT_SECRET" set to "your-jwt-secret" without making any changes to the deployment on the server.
Command: ```bash kubectl set env deployment/database-deployment JWT_SECRET=your-jwt-secret -o yaml ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable definitions in one or more...
Attach to the time-machine container in the monitoring-pod and get its output
Command: ```bash kubectl attach monitoring-pod -c time-machine ``` What it does: Attach to a process that is already running inside an existing container. Syntax: `kubectl attach (POD | TYPE/NAME) -c CONTAINER` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "Container name. If omitted, ...
Remove the label 'app' from the pod named 'monitoring' if it exists
Command: ```bash kubectl label pods monitoring app- ``` What it does: Update the labels on a resource. Syntax: `kubectl label [--overwrite] (-f FILENAME | TYPE NAME) KEY_1=VAL_1 ... KEY_N=VAL_N [--resource-version=version]` Helpful flags: "flag": "--all-namespaces", "short": "-A", "default": "false", "usage": "If tr...
Set the custom TLS server name "web-cluster" to use for validation for the kube-cluster-2 cluster entry.
Command: ```bash kubectl config set-cluster kube-cluster-2 --tls-server-name=web-cluster ``` What it does: Set a cluster entry in kubeconfig. Specifying a name that already exists will merge new fields on top of existing values for those fields. Syntax: `kubectl config set-cluster NAME [--server=server] [--certificat...
Create a cluster role named "default_role" with specified API Group, using the kubectl command.
Command: ```bash kubectl create clusterrole default_role --verb=proxy,get,update --resource=tokenreviews.authentication.k8s.io ``` What it does: Create a cluster role. Syntax: `kubectl create clusterrole NAME --verb=verb --resource=resource.group [--resource-name=resourcename] [--dry-run=server|client|none]` Helpful...
List the deployments in YAML format, specifically in the "legacy-1.0.0" version of the "extensions" API group.
Command: ```bash kubectl get deployments.legacy-1.0.0.extensions -o yaml ``` What it does: Display one or many resources. Prints a table of the most important information about the specified resources. You can filter the list using a label selector and the --selector flag. If the desired resource type is namespaced yo...
Set resource request and limits for containers in mongo deployment
Command: ```bash kubectl set resources deployment mongo --limits=cpu=200m,memory=512Mi --requests=cpu=50m,memory=128Mi ``` What it does: Specify compute resource requirements (CPU, memory) for any resource that defines a pod template. If a pod is successfully scheduled, it is guaranteed the amount of resource request...
Import specific keys from a config map for a deployment
Command: ```bash kubectl set env --keys=EXTERNAL_API_URL --from=configmap/log-config deployment/web-app-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable definition...
Import the EXTERNAL_API_URL key from the app-config-dev config map and set it as an environment variable in the cache-cluster-deployment deployment.
Command: ```bash kubectl set env --keys=EXTERNAL_API_URL --from=configmap/app-config-dev deployment/cache-cluster-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable ...
List the 'cdn-service-pod' pod in JSON format
Command: ```bash kubectl get -o json pod cdn-service-pod ``` What it does: Display one or many resources. Prints a table of the most important information about the specified resources. You can filter the list using a label selector and the --selector flag. If the desired resource type is namespaced you will only see ...
Create a new pod named "nginx" with the image "docker.elastic.co/elasticsearch/elasticsearch", but customize the pod configuration by providing a partial set of values parsed from a JSON string.
Command: ```bash kubectl run nginx --image=docker.elastic.co/elasticsearch/elasticsearch --overrides='{ "apiVersion": "v2.0.0", "spec": { ... } }' ``` What it does: Create and run a particular image in a pod. Syntax: `kubectl run NAME --image=image [--env="key=value"] [--port=port] [--dry-run=server|client] [--overri...
Create a new config map named app-config-prod with specified keys instead of file basenames on disk
Command: ```bash kubectl create configmap app-config-prod --from-file=settings=/path/to/parameters/file1.txt --from-file=key2=/path/to/configurations/file2.txt ``` What it does: Create a config map based on a file, directory, or specified literal value. A single config map may package one or more key/value pairs. When...
create a job named "certificate-renewal" with the image "ruby" and run the command "gem --version"
Command: ```bash kubectl create job certificate-renewal --image=ruby -- gem --version ``` What it does: Create a job with the specified name. Syntax: `kubectl create job NAME --image=image [--from=cronjob/name] -- [COMMAND] [args...]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage": "Output ...
Forward the traffic from port 6379 on all addresses to port 8888 in the 'web-app-pod' pod.
Command: ```bash kubectl port-forward --address 0.0.0.0 pod/web-app-pod 6379:8888 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, a pod will ...
Copy the local file "/tmp/foo" to the remote pod "ingress-controller-pod-8" in the "kube-system" namespace, at the path "/etc/kubernetes".
Command: ```bash kubectl cp :/tmp/foo kube-system/ingress-controller-pod-8:/etc/kubernetes ``` What it does: Copy files and directories to and from containers. Syntax: `kubectl cp <file-spec-src> <file-spec-dest>` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "Container name. If omitte...
Create a new ClusterIP service named catalog-service-clusterip
Command: ```bash kubectl create service clusterip catalog-service-clusterip --tcp=8082:3306 ``` What it does: Create a ClusterIP service with the specified name. Syntax: `kubectl create service clusterip NAME [--tcp=<port>:<targetPort>] [--dry-run=server|client|none]` Helpful flags: "flag": "--output", "short": "-o"...
Create a debug container from the email-service-pod with the container images changed to confluentinc/cp-kafka
Command: ```bash kubectl debug email-service-pod --copy-to=my-debugger --set-image=*=confluentinc/cp-kafka ``` What it does: Debug cluster resources using interactive debugging containers. 'debug' provides automation for common debugging tasks for cluster objects identified by resource and name. Pods will be used by d...
Create a new config map named `namespace-config` using the environment variables from a file
Command: ```bash kubectl create configmap namespace-config --from-env-file=path/to/configs.env ``` What it does: Create a config map based on a file, directory, or specified literal value. A single config map may package one or more key/value pairs. When creating a config map based on a file, the key will default to t...
Enable the OpenID Connect auth provider for the "jane.smith" entry with the client ID set to "foo" and the client secret set to "bar"
Command: ```bash kubectl config set-credentials jane.smith --auth-provider=oidc --auth-provider-arg=client-id=foo --auth-provider-arg=client-secret=bar ``` What it does: Set a user entry in kubeconfig. Specifying a name that already exists will merge new fields on top of existing values. Client-certificate flags: --...
List the container name and image of a specific pod
Command: ```bash kubectl get pod email-service-pod -o custom-columns=CONTAINER:.spec.containers[0].name,IMAGE:.spec.containers[0].image ``` What it does: Display one or many resources. Prints a table of the most important information about the specified resources. You can filter the list using a label selector and the...
Update pod 'security' by adding the annotation 'compliance-level' with the value 'PCI-DSS'
Command: ```bash kubectl annotate pods security compliance-level=PCI-DSS ``` What it does: Update the annotations on one or more resources. All Kubernetes objects support the ability to store additional data with the object as annotations. Annotations are key/value pairs that can be larger than labels and include arbi...
Open the 'payment-service' service for editing using the 'nano' editor
Command: ```bash KUBE_EDITOR="nano" kubectl edit svc/payment-service ``` What it does: Edit a resource from the default editor. The edit command allows you to directly edit any API resource you can retrieve via the command-line tools. It will open the editor defined by your KUBE_EDITOR, or EDITOR environment variables...
Create a new config map named app-secrets from the key=value pairs in the specified file
Command: ```bash kubectl create configmap app-secrets --from-file=path/to/settings ``` What it does: Create a config map based on a file, directory, or specified literal value. A single config map may package one or more key/value pairs. When creating a config map based on a file, the key will default to the basename ...
Create a cluster role named "admin_role" with the ability to perform the "get" action on the "services" resource, specifically on the "app-worker-2" and "backup-service" resources.
Command: ```bash kubectl create clusterrole admin_role --verb=get --resource=services --resource-name=app-worker-2 --resource-name=backup-service ``` What it does: Create a cluster role. Syntax: `kubectl create clusterrole NAME --verb=verb --resource=resource.group [--resource-name=resourcename] [--dry-run=server|cli...
Update the 'app-node-6' node by merging the specified JSON patch, updating the 'someField' field with the value 'newValue'
Command: ```bash kubectl patch node app-node-6 -p '{"spec":{"someField":"newValue"}' ``` What it does: Update fields of a resource using strategic merge patch, a JSON merge patch, or a JSON patch. JSON and YAML formats are accepted. Syntax: `kubectl patch (-f FILENAME | TYPE NAME) [-p PATCH|--patch-file FILE]` Helpf...
Copy the local file /tmp/foo to the remote pod velero/cache-pod-5 in the namespace, and place it at /tmp/bar
Command: ```bash kubectl cp /tmp/foo velero/cache-pod-5:/tmp/bar ``` What it does: Copy files and directories to and from containers. Syntax: `kubectl cp <file-spec-src> <file-spec-dest>` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "Container name. If omitted, use the kubectl.kuberne...
Create a LoadBalancer service named security-service-lb
Command: ```bash kubectl create service loadbalancer security-service-lb --tcp=3001:3001 ``` What it does: Create a LoadBalancer service with the specified name. Syntax: `kubectl create service loadbalancer NAME [--tcp=port:targetPort] [--dry-run=server|client|none]` Helpful flags: "flag": "--output", "short": "-o",...
Create a new config map named global-config and populate it with data from specified files
Command: ```bash kubectl create configmap global-config --from-file=conf=/path/to/preferences/file1.txt --from-file=data=/path/to/properties/file2.txt ``` What it does: Create a config map based on a file, directory, or specified literal value. A single config map may package one or more key/value pairs. When creating...
Create a single ingress called 'myapp-ingress' with the rule that directs requests from foo.com/module to svc1:8083
Command: ```bash kubectl create ingress myapp-ingress --rule="foo.com/module=svc1:8083,tls=my-cert" ``` What it does: Create an ingress with the specified name. Syntax: `kubectl create ingress NAME --rule=host/path=service:port[,tls[=secret]]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usage":...
Embed certificate authority data for the cluster entry
Command: ```bash kubectl config set-cluster star-cluster --embed-certs --certificate-authority=~/.kube/app-cluster/kubernetes.ca.crt ``` What it does: Set a cluster entry in kubeconfig. Specifying a name that already exists will merge new fields on top of existing values for those fields. Syntax: `kubectl config set-...
Create a cron job named "system-health-check" that runs the command "redis-server" using the "redis" image every minute.
Command: ```bash kubectl create cronjob system-health-check --image=redis --schedule="*/1 * * * *" -- redis-server ``` What it does: Create a cron job with the specified name. Syntax: `kubectl create cronjob NAME --image=image --schedule='0/5 * * * ?' -- [COMMAND] [args...]` Helpful flags: "flag": "--output", "short...
execute the 'docker run -d ubuntu sleep 3600' command within the 'log-aggregator-pod' pod and capture the output
Command: ```bash kubectl exec log-aggregator-pod -c rocket-ranger -- docker run -d ubuntu sleep 3600 ``` What it does: Execute a command in a container. Syntax: `kubectl exec (POD | TYPE/NAME) [-c CONTAINER] [flags] -- COMMAND [args...]` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "C...
Create a single ingress called 'rontend-ingress' that directs requests to testing.com/bar to svc1:3306 with a tls secret "my-cert"
Command: ```bash kubectl create ingress rontend-ingress --rule="testing.com/bar=svc1:3306,tls=my-cert" ``` What it does: Create an ingress with the specified name. Syntax: `kubectl create ingress NAME --rule=host/path=service:port[,tls[=secret]]` Helpful flags: "flag": "--output", "short": "-o", "default": "", "usag...
Execute the 'redis-server' command in the 'astro-container' from the pod 'gateway-pod'
Command: ```bash kubectl exec gateway-pod -c astro-container -- redis-server ``` What it does: Execute a command in a container. Syntax: `kubectl exec (POD | TYPE/NAME) [-c CONTAINER] [flags] -- COMMAND [args...]` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "Container name. If omitte...
Create a new cron job called 'monthly-audit' using the 'ruby' image, with a schedule set to run every minute
Command: ```bash kubectl create cronjob monthly-audit --image=ruby --schedule="*/1 * * * *" -- gem --version ``` What it does: Create a cron job with the specified name. Syntax: `kubectl create cronjob NAME --image=image --schedule='0/5 * * * ?' -- [COMMAND] [args...]` Helpful flags: "flag": "--output", "short": "-o...
Create a role named "view" with ResourceName specified
Command: ```bash kubectl create role view --verb=watch --resource=pods --resource-name=backup-service --resource-name=identity-provider ``` What it does: Create a role with single rule. Syntax: `kubectl create role NAME --verb=verb --resource=resource.group/subresource [--resource-name=resourcename] [--dry-run=server...
Copy the file /tmp/foo from the pod load-balancer-pod-9 in the kube-server cluster to the local directory /etc/kubernetes
Command: ```bash kubectl cp kube-server/load-balancer-pod-9:/tmp/foo /etc/kubernetes ``` What it does: Copy files and directories to and from containers. Syntax: `kubectl cp <file-spec-src> <file-spec-dest>` Helpful flags: "flag": "--container", "short": "-c", "default": "", "usage": "Container name. If omitted, use...
Add a taint with key 'hardware' on nodes having the label 'instance=app-instance-1'
Command: ```bash kubectl taint node -l instance=app-instance-1 hardware=testing-node-11:PreferNoSchedule ``` What it does: Update the taints on one or more nodes. Syntax: `kubectl taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N` Helpful flags: "flag": "--output", "short": "-o", "default": ...
Create a cron job named "daily-report" that runs the command "java -jar /usr/share/jenkins/jenkins.war" every minute, using the Jenkins image.
Command: ```bash kubectl create cronjob daily-report --image=jenkins --schedule="*/1 * * * *" -- java -jar /usr/share/jenkins/jenkins.war ``` What it does: Create a cron job with the specified name. Syntax: `kubectl create cronjob NAME --image=image --schedule='0/5 * * * ?' -- [COMMAND] [args...]` Helpful flags: "fl...
Import the 'SECRET_KEY' key from the 'ui-config' config map into the 'scheduler-app-deployment' deployment.
Command: ```bash kubectl set env --keys=SECRET_KEY --from=configmap/ui-config deployment/scheduler-app-deployment ``` What it does: Update environment variables on a pod template. List environment variable definitions in one or more pods, pod templates. Add, update, or remove container environment variable definitions...
Forward local port 8080 to port 5432 in the pod "security-service-pod".
Command: ```bash kubectl port-forward pod/security-service-pod 8080 5432 ``` What it does: Forward one or more local ports to a pod. Use resource type/name such as deployment/mydeployment to select a pod. Resource type defaults to 'pod' if omitted. If there are multiple pods matching the criteria, a pod will be select...