The main purpose of the deployment object is to maintain the resources declared in the deployment configuration in its desired state. (Note: Adjust the apiVersion of some resource if your kubernetes cluster's version is not 1.8+, check the yaml file for more information). Introduction: In Kubernetes, pods are the basic units that get deployed in the cluster. new ReplicaSet. containers: This page shows how to assign a CPU request and a CPU limit to a container. 1. the new replicas become healthy.
The following are typical use cases for Deployments:The following is an example of a Deployment.
As with all other Kubernetes configs, a Deployment needs In addition to required fields for a Pod, a Pod template in a Deployment must specify appropriate From here I was able to quickly see that I’d forgotten to add the To fix the problem, I first deleted the Pod, then fixed the YAML file and started again. You can find a full list of the OK, so now that we know we want 2 replicas, we need to answer the question: “Replicas of what?” They’re defined by templates:Look familiar?
This is called For example, you are running a Deployment with 10 replicas, Ensure that the 10 replicas in your Deployment are running.You update to a new image which happens to be unresolvable from inside the cluster.The image update starts a new rollout with ReplicaSet nginx-deployment-1989198191, but it's blocked due to the You can see that if you ask for a list of the pods:NAME READY STATUS RESTARTS AGErss-site 0/2 ContainerCreating 0 6sIf you check early enough, you can see that the pod is still being created.
kubectl apply -f myComponents.yaml Service So on the one hand, if you know JSON and you’re only ever going to write your own YAML (as opposed to reading other people’s) you’re all set. env:
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You can also specify even deeper information, such as the location of the container’s exit log. conditions and the Deployment controller then completes the Deployment rollout, you'll see the 2. You can check the event log by describing the Deployment, as before:CreationTimestamp: Mon, 09 Jan 2017 17:42:14 +0000=Replicas: 2 updated | 2 total | 1 available | 1 unavailableRollingUpdateStrategy: 1 max unavailable, 1 max surgeNewReplicaSet: rss-site-4056856218 (2/2 replicas created) FirstSeen LastSeen Count From SubobjectPath Type Reason Message --------- -------- ----- ---- ------------- -------- ------ -------As you can see here, there’s no problem, it just hasn’t finished scaling up yet.
It can be You can monitor the progress for a Deployment by using You can check if a Deployment has completed by using Your Deployment may get stuck trying to deploy its newest ReplicaSet without ever completing. 2. By default, it ensures that at most 125% of the desired number of Pods are up (25% max surge).For example, if you look at the above Deployment closely, you will see that it first created a new Pod, spec: As you can see, a Check if the rollback was successful and the Deployment is running as expected, run:You can scale a Deployment by using the following command:RollingUpdate Deployments support running multiple versions of an application at the same time.
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