Sage-Tips

What does it mean if a Gke deployment enters a failed state?

A completed state indicates that the Deployment has successfully completed its tasks, all of its Pods are running with the latest specification and are available, and no old Pods are still running. A failed state indicates that the Deployment has encountered one or more issues that prevent it from completing its tasks.

What will happen if a running Gke pod encounters a fatal error?

What will happen if a running GKE node encounters a fatal error? GKE will automatically start that node on an available GCE host. Nodes are GCE instances managed by the GKE system. If one of the nodes dies, GKE will bring another node up to replace it and will ensure that any affected pods are restarted.

How do I reset my Gke?

There is not a command that will allow you to restart the Kubernetes master in GKE (since the master is considered a part of the managed service). There is automated infrastructure (and then an oncall engineer from Google) that is responsible for restarting the master if it is unhealthy.

How do I resolve Imagepullbackoff?

Additional debugging steps

1. try to pull the docker image and tag manually on your computer.
2. Identify the node by doing a ‘kubectl/oc get pods -o wide’
3. ssh into the node (if you can) that can not pull the docker image.
4. check that the node can resolve the DNS of the docker registry by performing a ping.

How do you update a Kubernetes Deployment?

Updating a Deployment

1. After the rollout succeeds, you can view the Deployment by running kubectl get deployments .
2. Run kubectl get rs to see that the Deployment updated the Pods by creating a new ReplicaSet and scaling it up to 3 replicas, as well as scaling down the old ReplicaSet to 0 replicas.

How do you reset a Kubernetes pod?

Restarting Kubernetes Pods Using kubectl

1. You can use docker restart {container_id} to restart a container in the Docker process, but there is no restart command in Kubernetes.
2. Method 1 is a quicker solution, but the simplest way to restart Kubernetes pods is using the rollout restart command.

What is cordon in GCP?

Cordon the existing node pool: This operation marks the nodes in the existing node pool ( default-pool ) as unschedulable. Kubernetes stops scheduling new Pods to these nodes once you mark them as unschedulable.

How do you reset a Gke container?

Therefore, I propose the following solution, restart:

1. 1) Set scale to zero : kubectl scale deployment <> –replicas=0 -n service. The above command will terminate all your pods with the name <>
2. 2) To start the pod again, set the replicas to more than 0 kubectl scale deployment <> –replicas=2 -n service.

How do I restart my Kubernetes service?

1. (Optional) Swap off. $ swapoff -a.
2. You have to restart all Docker containers. $ docker restart $(docker ps -a -q)
3. Check the nodes status after you performed step 1 and 2 on all nodes (the status is NotReady) $ kubectl get nodes.
4. Restart the node.
5. Check again the status (now should be in Ready status)

How do I fix ImagePullBackOff in Kubernetes?

To resolve it, double check the pod specification and ensure that the repository and image are specified correctly. If this still doesn’t work, there may be a network issue preventing access to the container registry. Look in the describe pod text file to obtain the hostname of the Kubernetes node.

How do I resolve ImagePullBackOff error in Kubernetes?

Solution to ImagePullBackoff:

1. Make sure that your Image points to latest version repouser/reponame:latest.
2. Create a secret docker-registry (look above)
3. Server address[docker-hub registry]
4. Add the following propertie in pod yaml file (look above):

What happens if Kubernetes readiness probe fails?

If the Liveness Probe fails, Kubernetes will kill your container and create a new one. If the Readiness Probe fails, that Pod will not be available as a Service endpoint, meaning no traffic will be sent to that Pod until it becomes Ready.

What is my-service in Kubernetes?

This specification creates a new Service object named “my-service”, which targets TCP port 9376 on any Pod with the app=MyApp label. Kubernetes assigns this Service an IP address (sometimes called the “cluster IP”), which is used by the Service proxies (see Virtual IPs and service proxies below).

How does Kubernetes handle Kube-proxy?

When a request is made, it is accepted by the kube-proxy component and forwarded onto pod A1 or A2, which then handles the request. Although the service is exposed to the host, it is also given its own service IP on a separate CIDR from the pod network and can be accessed from within the cluster as well on that IP.

How to fix Google Kubernetes Engine Service agent not working?

To resolve the issue, if you have removed the Kubernetes Engine Service Agent role from your Google Kubernetes Engine service account, add it back. Otherwise, you must re-enable the Kubernetes Engine API, which will correctly restore your service accounts and permissions. You can do this in the gcloud tool or the Cloud Console.