Lab 1:\u00a0 Replication Controller<\/p>\n
Lab2: Replicaset<\/p>\n MatchLabel<\/p>\n matchexpression<\/p>\n Try to create one pod with same label<\/p>\n Delete the pod<\/p>\n Again Create the pod and create rs , and check how many replicas<\/p>\n <\/p>\n Lab3 : Deployment<\/p>\n This Deployment definition ensures that there will always be three replicas (pods) of the Nginx image (version 1.14.2) running, exposing port 80.<\/p>\n Deployments offer features like rolling updates, scaling, and automated rollout and rollback strategies, making them a more robust way to manage your application’s replicas in Kubernetes.<\/p>\n Lab 4: Rolling update Deployment<\/p>\n Lab 5: Recreate<\/p>\n Lab 6: Statefulsets<\/p>\n![\"\"](\"https:\/\/www.openwriteup.com\/wp-content\/uploads\/2023\/08\/rc.jpg\")
<\/a><\/p>\nkind<\/code>: The type of Kubernetes resource being defined. Here, it’s a ReplicationController<\/code>.<\/p>\nspec<\/code>: The specification for the ReplicationController, which includes:<\/p>\n\n
replicas<\/code>: The desired number of replicas (pods) that the ReplicationController should maintain. In this case, it’s set to 3<\/code>.<\/li>\nselector<\/code>: A set of labels that the ReplicationController uses to identify the pods it should manage. In this case, it’s selecting pods with the label app: nginx<\/code>.<\/li>\n<\/ul>\n kubectl create -f repc.yaml\r\nkubectl get rc\r\nkubectl describe replicationcontroller hello-dep \r\n# for deleting rc\r\nkubectl delete -f repc.yaml<\/pre>\n
kubectl create -f replicasetmatchlabel.yaml\r\nkubectl describe replicaset.apps\/my-replicaset\r\nkubectl delete replicaset.apps\/my-replicaset<\/pre>\n
kubectl create -f matchexpressionset.yaml\r\nkubectl describe replicaset.apps\/my-replicaiset1<\/pre>\n
kubectl create -f replicasetpod.yaml<\/pre>\n
kubectl delete replicaset.apps\/my-replicaiset1<\/pre>\n
kubectl create -f replicasetpod.yaml\r\nkubectl create -f matchexpressionset.yaml\r\nkubectl describe replicaset.apps\/my-replicaiset1<\/pre>\n
<\/a><\/p>\nkubectl create -f dep.yaml\r\nkubectl get deployment\r\nkubectl get pods\r\nkubectl describe deployment nginx-deployment\r\n#For deleting the deployment\r\nkubectl delete -f dep.yaml<\/pre>\n
<\/a><\/p>\nstrategy<\/code>: The update strategy for the Deployment. Here, it’s set to RollingUpdate<\/code>, which ensures a gradual and controlled update of pods.<\/p>\n\n
rollingUpdate<\/code>: Configuration parameters for the rolling update strategy.\n\n
maxSurge<\/code>: The maximum number of pods that can be created above the desired replicas during an update. Here, it’s set to 1<\/code>, meaning one additional pod can be created.<\/li>\nmaxUnavailable<\/code>: The maximum number (or percentage) of pods that can be unavailable during an update. Here, it’s set to 25%<\/code>, which allows up to 25% of pods to be unavailable at a time during the updat<\/li>\n<\/ul>\n<\/li>\n<\/ul>\nkubectl create -f ru.yaml\r\nkubectl get deployment\r\nkubectl get pods\r\nkubectl get rs\r\nkubectl describe deployment hello-rcp\r\n# update the image\r\n kubectl set image deployment\/hello-rcp hello-dep=nginx:1.16.1\r\n# Check rollout status\r\nkubectl rollout status deployment\/hello-rcp\r\n#Rollout history\r\nkubectl rollout history deployment\/hello-rcp\r\n#roll back\r\n kubectl rollout undo deployment\/hello-rcp --to-revision=1\r\n#scaleup\r\n kubectl scale deployment\/hello-rcp --replicas=10\r\n\r\nkubectl rollout history deployment hello-dep --revision=0\r\nkubectl rollout history deployment hello-dep --revision=1\r\n#delete\r\n kubectl delete deployment.apps\/hello-rcp<\/pre>\n
<\/a><\/p>\nstrategy<\/code>: The update strategy for the Deployment. Here, it’s set to Recreate<\/code>, which means that during an update, the existing pods are scaled down to zero replicas before scaling up the new ones. This is a less sophisticated strategy compared to RollingUpdate<\/code>, and it can result in temporary downtime during updates.<\/p>\nkubectl create -f rc.yaml\r\nkubectl get deployment\r\nkubectl get pods\r\nkubectl get rs\r\nkubectl describe deployment hello-dep\r\n# update the image\r\nkubectl set image deployment\/hello-dep hello-dep=nginx:1.16.1\r\n# Check rollout status\r\nkubectl rollout status deployment\/hello-dep\r\n#Rollout history\r\nkubectl rollout history deployment\/hello-dep\r\n#roll back\r\nkubectl rollout undo deployment\/hello-dep --to-revision=1\r\n#scaleup\r\nkubectl scale deployment\/hello-dep --replicas=10\r\n#delete\r\nkubectl delete deployment.apps\/hello-dep<\/pre>\n