I am new to kubernetes and want to follow the logs for two pods at the same time. But to do that i have to open two terminals and use the following command
kubectl logs -f <POD_NAME> -n namespace
I was wondering if there was some better way to get the logs without opening multiple terminals as this creates a serious problem if the number of pods increase.
I am not looking for some logging tool but some easy to set up way which can help me in achieving this.
Thanks in advance.
As already explained in the previous you can use the labels if the pods shares any. If you have multiple containers in a pod you can use this command:
kubectl logs -n <namespace> -f deployment/<app-name>
--all-containers=true
If you are looking for some simple tool you have couple of options:
Stern allows you to tail multiple pods on Kubernetes and multiple containers within the pod. Each result is color coded for quicker debugging. The query is a regular expression so the pod name can easily be filtered and you don't need to specify the exact id (for instance omitting the deployment id). If a pod is deleted it gets removed from tail and if a new pod is added it automatically gets tailed.
With a simple command like this:
stern -n <namespace> <app-name> -t --since 30m
Stern will tail logs from the given namespace for that app name since last 30 minutes.
It`s a bash script that enables you to aggregate (tail/follow) logs from multiple pods into one stream. This is the same as running "kubectl logs -f " but for multiple pods.
Streams logs from all containers of all matched pods. Match pods by service, replicaset, deployment, and others. Adjusts to a changing cluster - pods are added and removed from logging as they fall in or out of the selection.
It`s tail -f experience for Kubernetes Pods
Do they share the same labels? If they do, then you can filter them by using kubectl logs itself. For example:
kubectl logs -n <namespace> -l <label-key>=<label-value>