Run a container on a pod failure Kubernetes
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I have a cronjob that runs and does things regularly. I want to send a slack message with the technosophos/slack-notify container when that cronjob fails.
Is it possible to have a container run when a pod fails?
There is nothing built in for this that i am aware of. You could use a web hook to get notified when a pod changes and look for state stuff in there. But you would have to build the plumbing yourself or look for an existing third party tool.
Troubleshoot Applications, Look at the state of the containers in the pod. Are they all Running ? Have there been recent restarts? Continue debugging depending on the FEATURE STATE: Kubernetes v1.6 [stable] To run containers in Pods, Kubernetes uses a container runtime. Here are the installation instructions for various runtimes. Caution: A flaw was found in the way runc handled system file descriptors when running containers. A malicious container could use this flaw to overwrite contents of the runc binary and consequently run arbitrary commands on the
Pods and Jobs are different things. If you want to wait for a job that has failed and send an email after it has, you can do something like this in bash:
while true do kubectl wait --for=condition=failed job/myjob kubectl run --image=technosophos/slack-notify --env="EMAILemail@example.com" done
Pod Lifecycle, You can use the kubectl alpha debug command to add ephemeral containers to a running Pod. a shell you will see an error because there is no shell in this container image. Pods that run a single container. The "one-container-per-Pod" model is the most common Kubernetes use case; in this case, you can think of a Pod as a wrapper around a single container, and Kubernetes manages the Pods rather than the containers directly. Pods that run multiple containers that need to work together. A Pod might encapsulate an
To the question: Is it possible to have a container run when a pod fails?
Yes , although there is nothing out of the box right now , but you can define a health check.
Then you can write a cron job , or a Jenkins job , or a custom kubernetes cluster service/controller that checks/probes that health check regularly and if the health check fails then you can run a container based on that.
Debug Pods and ReplicationControllers, You can specify init containers in the Pod specification alongside the init containers A PodA Pod represents a set of running containers in your cluster. If a Pod's init container fails, Kubernetes repeatedly restarts the Pod I am currently using the kubernetes mix os cluster of linux and windows with following detail. Windows version : windows 10 pro /windows 2019 datacenter Kubernetes version : v1.18.0 Docker base
Debug Running Pods, The hooks enable Containers to be aware of events in their management lifecycle and run code implemented in a handler when the Warning FailedSync Error syncing pod, skipping: failed to "StartContainer" for "main" with Kubernetes 101: Pods, Nodes, Containers, and Clusters Kubernetes doesn’t run containers any time in a production system to allow load balancing and failure resistance. Pods can hold
Init Containers, an overview of ephemeral containers: a special type of container that runs temporarily in an existing PodA Pod represents a set of running containers in your Containers are a technology for packaging the (compiled) code for an application along with the dependencies it needs at run time. Each container that you run is repeatable; the standardization from having dependencies included means that you get the same behavior wherever you run it. Containers decouple applications from underlying host infrastructure. This makes deployment easier in
Container Lifecycle Hooks, A Pod represents processes running on your clusterA set of worker machines, A Pod encapsulates an application's container (or, in some cases, multiple replication and rollout and automatic healing in case of Pod failure. Note: My application is hosted on port 3000 so I’m opening port 3000 when I run the container, if your application doesn’t require a port just remove the port parameter. If you want to see this container running in your cluster, simply call for the pods. (Kubernetes groups containers together in ‘Pods’.