k8stail
tail -f experience for Kubernetes Pods
As you know, kubectl logs can stream only ONE pod at the same time. k8stail enables you to watch log streams of ALL pods in the specified namespace or labels in real time, like tail -f.
Table of Contents
Requirements
Kubernetes 1.3 or above
Installation
Using Homebrew (OS X only)
Formula is available at dtan4/homebrew-dtan4.
$ brew tap dtan4/dtan4
$ brew install k8stailPrecompiled binary
Precompiled binaries for Windows, OS X, Linux are available at Releases.
From source
$ go get -d github.com/dtan4/k8stail
$ cd $GOPATH/src/github.com/dtan4/k8stail
$ make deps
$ make installRun in a Docker container
Docker image is no longer provided officially.
If you'd like to run k8sec in Docker image, see Dockerfile and build image by yourself.
docker build -t k8stail .Usage
Logs of all pods, all containers in pod in the specified namespace are streaming. When new pod is added, logs of the pod also appears.
To stop streaming and exit, press Ctrl-C.
$ k8stail --namespace awesome-app
Namespace: awesome-app
Labels:
----------
Pod awesome-app-web-4212725599-67vd4 has detected
Pod awesome-app-web-4212725599-6pduy has detected
Pod awesome-app-web-4212725599-lbuny has detected
Pod awesome-app-web-4212725599-mh3g1 has detected
Pod awesome-app-web-4212725599-pvjsm has detected
[awesome-app-web-4212725599-mh3g1][web] | creating base compositions...
[awesome-app-web-4212725599-zei9h][web] | (47.1ms) CREATE TABLE "schema_migrations" ("version" character varying NOT NULL)
[awesome-app-web-4212725599-zei9h][web] | (45.1ms) CREATE UNIQUE INDEX "unique_schema_migrations" ON "schema_migrations" ("version")
[awesome-app-web-4212725599-zei9h][web] | ActiveRecord::SchemaMigration Load (1.8ms) SELECT "schema_migrations".* FROM "schema_migrations"
[awesome-app-web-4212725599-zei9h][web] | Migrating to CreatePosts (20160218082522)With --timestamps option, log timestamp is printed together.
$ k8stail --namespace awesome-app --timestamps
Namespace: awesome-app
Labels:
----------
Pod awesome-app-web-4212725599-67vd4 has detected
Pod awesome-app-web-4212725599-6pduy has detected
Pod awesome-app-web-4212725599-lbuny has detected
Pod awesome-app-web-4212725599-mh3g1 has detected
Pod awesome-app-web-4212725599-pvjsm has detected
[awesome-app-web-4212725599-mh3g1][web] 2016-11-15T10:57:22.178667425Z | creating base compositions...
[awesome-app-web-4212725599-zei9h][web] 2016-11-15T10:57:22.309011520Z | (47.1ms) CREATE TABLE "schema_migrations" ("version" character varying NOT NULL)
[awesome-app-web-4212725599-zei9h][web] 2016-11-15T10:57:22.309053601Z | (45.1ms) CREATE UNIQUE INDEX "unique_schema_migrations" ON "schema_migrations" ("version")
[awesome-app-web-4212725599-zei9h][web] 2016-11-15T10:57:22.463700110Z | ActiveRecord::SchemaMigration Load (1.8ms) SELECT "schema_migrations".* FROM "schema_migrations"
[awesome-app-web-4212725599-zei9h][web] 2016-11-15T10:57:22.463743373Z | Migrating to CreatePosts (20160218082522)With --labels option, you can filter pods to watch.
$ k8stail --namespace awesome-app --labels name=awesome-app-web
Namespace: awesome-app
Labels: name=awesome-app-web
----------
Pod awesome-app-web-4212725599-67vd4 has detected
Pod awesome-app-web-4212725599-6pduy has detected
Pod awesome-app-web-4212725599-lbuny has detected
Pod awesome-app-web-4212725599-mh3g1 has detected
Pod awesome-app-web-4212725599-pvjsm has detected
[awesome-app-web-4212725599-mh3g1][web] | creating base compositions...
[awesome-app-web-4212725599-zei9h][web] | (47.1ms) CREATE TABLE "schema_migrations" ("version" character varying NOT NULL)
[awesome-app-web-4212725599-zei9h][web] | (45.1ms) CREATE UNIQUE INDEX "unique_schema_migrations" ON "schema_migrations" ("version")
[awesome-app-web-4212725599-zei9h][web] | ActiveRecord::SchemaMigration Load (1.8ms) SELECT "schema_migrations".* FROM "schema_migrations"
[awesome-app-web-4212725599-zei9h][web] | Migrating to CreatePosts (20160218082522)kubeconfig file
k8stail uses ~/.kube/config as default. You can specify another path by KUBECONFIG environment variable or --kubeconfig option. --kubeconfig option always overrides KUBECONFIG environment variable.
$ KUBECONFIG=/path/to/kubeconfig k8stail
# or
$ k8stail --kubeconfig=/path/to/kubeconfigOptions
| Option | Description | Required | Default |
|---|---|---|---|
--context=CONTEXT |
Kubernetes context | ||
--debug |
Debug mode using pprof (http://localhost:6060) | false |
|
--kubeconfig=KUBECONFIG |
Path of kubeconfig | ~/.kube/config |
|
--labels=LABELS |
Label filter query (e.g. app=APP,role=ROLE) |
||
--namespace=NAMESPACE |
Kubernetes namespace | default |
|
--timestamps |
Include timestamps on each line | false |
|
-h, -help |
Print command line usage | ||
-v, -version |
Print version |
Development
Go 1.7 or above is required.
Clone this repository and build using make.
$ go get -d github.com/dtan4/k8stail
$ cd $GOPATH/src/github.com/dtan4/k8stail
$ makeAuthor
Daisuke Fujita (@dtan4)
