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https://github.com/atombender/ktail
A tool to easily tail Kubernetes container logs
https://github.com/atombender/ktail
cli devops golang kubernetes logging tail tool
Last synced: about 2 months ago
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A tool to easily tail Kubernetes container logs
- Host: GitHub
- URL: https://github.com/atombender/ktail
- Owner: atombender
- License: mit
- Created: 2017-04-24T03:08:09.000Z (over 7 years ago)
- Default Branch: main
- Last Pushed: 2024-04-19T12:15:57.000Z (5 months ago)
- Last Synced: 2024-04-19T13:36:00.172Z (5 months ago)
- Topics: cli, devops, golang, kubernetes, logging, tail, tool
- Language: Go
- Homepage:
- Size: 816 KB
- Stars: 313
- Watchers: 12
- Forks: 16
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
# `ktail` is a tool to tail Kubernetes containers
## It's like `kubectl logs`, but with a bunch of nice features
:white_check_mark: **Detects pods and containers as they come and go**. If you run `ktail foo` and later start a pod or container named `foo`, then it will be picked up automatically. `kubectl` only works on a running pod/container.
:white_check_mark: **Tails multiple pods and containers in multiple namespaces** at the same time, based on names and labels. `kubectl` can only tail a single pod and container. ktail will match the pattern or patterns you specify against both the pod name and the container name.
:white_check_mark: **All containers in a pod are tailed by default**, not just a specific one. With `kubectl`, you have to use `-c`. With ktail, just do `ktail foo` and all its containers are automatically tailed.
:white_check_mark: **Recovers from failure**. ktail will keep retrying forever. `kubectl` often just gives up.
:white_check_mark: **Better formatting**. ktail will show log lines in different colours, and has syntax highlighting of JSON payloads.
# Usage
ktail makes it super easy to tail by pod or container name. The following will match all containers whose pod name or container name contains the substring `foo`:
```shell
$ ktail foo
```
The arguments are regular expressions, so this is possible:
```shell
$ ktail '^foo'
```
If no filters are specified, _all_ pods in the current namespace are tailed.
Tailing supports the usual things like labels:
```shell
$ ktail -l app=myapp
```
This will tail all containers in all pods matching the label `app=myapp`. As new pods are created, it will also automatically tail those, too.
To abort tailing, hit `Ctrl+C`.
## Options
Run `ktail -h` for usage.
## Configuration
Ktail will read the file `$HOME/.config/ktail/config.yml` if it exists. This must be a file in YAML format. The following options can be set (these are the defaults):
```yaml
noColor: false
raw: false
timestamps: false
quiet: false
colorScheme: bw
colorMode: auto
kubeConfigPath: ""
templateString: ""
```
## Templating
ktail has a basic output format. To override, you can use a simple Go template. For example:
```shell
$ ktail -t "{{.Container.Name}} {{.Message}}"
```
The following variables are available:
* `Timestamp`: The time of the log event.
* `Message`: The log message.
* `Pod`: The pod object. It has properties such as `Name`, `Namespace`, `Status`, etc.
* `Container`: The container object. It has properties such as `Name`.
# Installation
## Homebrew
```shell
$ brew tap atombender/ktail
$ brew install atombender/ktail/ktail
```
## Binary installation
Precompiled binaries for Windows, macOS, Linux (x64 and ARM) are available on the [GitHub release page](https://github.com/atombender/ktail/releases).
## From source
This requires Go >= 1.10, as we use Go modules.
```shell
$ mkdir -p $GOPATH/src/github.com/atombender
$ cd $GOPATH/src/github.com/atombender
$ git clone https://github.com/atombender/ktail
$ cd ktail
$ go install .
```
# Acknowledgements
Some setup code was borrowed from [k8stail](https://github.com/dtan4/k8stail).
# License
MIT license. See `LICENSE` file.