k8s-vault

CLI utility, which makes it easy to reach K8s API via jumphost, using SSH port forwarding.

Like aws-vault is a helper for AWS related CLI tools, k8s-vault is a helper for CLI tools using KUBECONFIG. Unlike AWS-Vault, vault here is used as a verb, synonymous to leap, jump, spring, etc..

Original implementation of k8s-vault in Bash is available here.

NOTE: Bash implementation uses slightly different config file, and old config wont work with this implementation. See example config.

Installation

Get latest release from Releases page.

Or build from source:

git clone https://github.com/anapsix/k8s-vault.cr.git
cd k8s-vault.cr
shards build # or "make src/cli"
# copy ./bin/k8s-vault to some directory in your PATH

Usage

Your k8s-vault config is expected at ~/.kube/k8s-vault-new.yaml, but it's location can be customized using K8SVAULT_CONFIG environment variable.

Likewise, KUBECONFIG is expected at ~/.kube/config, but environment variable will take precedence.

# Single CLI command mode
$ k8s-vault exec my-prod-context -- kubectl get nodes
(outputs results of "kubectl get nodes")
(SSH connection is terminated)

# SHELL mode
$ k8s-vault exec my-prod-context -s
(new shell is opened, with KUBECONFIG environment variable set)
$ kubectl get nodes
$ exit
(SSH connection is terminated)

when launched in SHELL mode, K8SVAULT_CONTEXT environment variable will be be set to selected context

Usage: k8s-vault [--debug] [completion|exec <context-name>] [-s | -- <cli tool using KUBECONFIG>]

CLI Options:
  -h | --help | --usage  displays usage
  -d | --debug           enabled debug output
  example-config         outputs example config
  completion             outputs bash completion code
  exec                   executes K8s-Vault

Environment variables:
  K8SVAULT_CONFIG        path to k8s-vault config file, defaults to ~/.kube/k8s-vault.yaml
  KUBECONFIG             path to KUBECONFIG file

It works in two modes:
1. Single CLI command mode:
  - generates KUBECONFIG from exiting one, based on context name passed
  - sets up SSH Connection, Port-Forwarding random local port (or configured
    static port) to K8s API server host, selected from existing KUBECONFIG
    based on passed context name
  - executes CLI command
  - SSH Connection self-terminates after CLI command terminates
2. SHELL mode:
  - generates KUBECONFIG from exiting one, based on context name passed
  - sets up SSH Connection, Port-Forwarding random local port (or configured
    static port) to K8s API server host, selected from existing KUBECONFIG
    based on passed context name
  - executes SHELL (using $SHELL environmental variable), with KUBECONFIG
    environment variable value set to generated temp config file
  - when SHELL terminates, SSH connection is also terminated

Contributing

1. Fork it (https://github.com/anapsix/k8s-vault.cr/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• anapsix (Anastas Dancha) - creator, maintainer