stern

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 is added it automatically gets tailed.

When a pod contains multiple containers Stern can tail all of them too without having to do this manually for each one. Simply specify the container flag to limit what containers to show. By default all containers are listened to.

Installation

go get -u github.com/wercker/stern

Usage

NAME:
   stern - Tail multiple pods and containers from Kubernetes

USAGE:
   stern [options] pod-query

VERSION:
   1.0.0

COMMANDS:
     help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --container value, -c value  Container name when multiple containers in pod (default: ".*")
   --timestamps, -t             Print timestamps
   --since value, -s value      Return logs newer than a realtive duration like 5s, 2m, or 3h. Defaults to all logs.
   --context value              Kubernetes context to use
   --namespace value            Kubernetes namespace to use (default: "default")
   --kube-config value          Path to kubeconfig file to use
   --help, -h                   show help
   --version, -v                print the version

Examples:

Tail the gateway container running inside of the envvars pod on staging

stern --context staging --container gateway envvars

Show auth activity from 15min ago with timestamps

stern -t --since 15m auth

Follow the development of some-new-feature in minikube

stern --context minikube some-new-feature

View pods from another namespace

stern --namespace kube-system kubernetes-dashboard