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Vincent Ambo 2f6e008121 feat templater: Add 'pass' lookup function
This introduces support for looking up secret values in the 'pass' command line
tool (https://www.passwordstore.org/).

Values like passwords can be interpolated from pass and even more complex
structures like certificates for Kubernetes Secrets can be retrieved and base64-
encoded as necessary.

Fixes #2
2017-02-09 15:44:18 +01:00
context feat context: Add deserialisation tests 2017-02-08 22:12:34 +01:00
example feat templater: Add 'pass' lookup function 2017-02-09 15:44:18 +01:00
templater feat templater: Add 'pass' lookup function 2017-02-09 15:44:18 +01:00
.gitignore chore: Add .gitignore 2017-02-08 11:50:18 +01:00
.travis.yml feat build: Add Travis.CI support 2017-02-08 13:00:34 +01:00
LICENSE chore: Add LICENSE 2017-02-08 11:58:26 +01:00
main.go feat main: Version bump to v1.0.0-beta1 2017-02-09 15:44:18 +01:00
README.md docs: Update README with 'delete' command 2017-02-08 18:16:00 +01:00

KonTemplate - A simple Kubernetes templater

Build Status

I made this tool out of frustration with the available ways to template Kubernetes resource files. All I want out of such a tool is a way to specify lots of resources with placeholders that get filled in with specific values, based on which context (i.e. k8s cluster) is specified.

Overview

KonTemplate lets you describe resources as you normally would in a simple folder structure:

.
├── prod-cluster.yaml
└── some-api
    ├── deployment.yaml
    └── service.yaml

This example has all resources belonging to some-api (no file naming conventions enforced at all!) in the some-api folder and the configuration for the cluster prod-cluster in the corresponding file.

Lets take a short look at prod-cluster.yaml:

---
context: k8s.prod.mydomain.com
global:
  globalVar: lizards
include:
  - name: some-api
    values:
      version: 1.0-0e6884d
      importantFeature: true
      apiPort: 4567

Those values are then templated into the resource files of some-api.

Installation

Assuming you have Go configured correctly, you can simply go get github.com/tazjin/kontemplate/....

Usage

You must have kubectl installed to use KonTemplate effectively.

NAME:
   kontemplate - simple Kubernetes resource templating

USAGE:
   kontemplate [global options] command [command options] [arguments...]

VERSION:
   0.0.1

COMMANDS:
     template  Interpolate and print templates
     apply     Interpolate templates and run 'kubectl apply'
     replace   Interpolate templates and run 'kubectl replace'
     delete    Interpolate templates and run 'kubectl delete'
     help, h   Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --help, -h     show help
   --version, -v  print the version

All options support the same set of extra flags:

OPTIONS:
   --file value, -f value     Cluster configuration file to use
   --include value, -i value  Limit templating to explicitly included resource sets
   --exclude value, -e value  Exclude certain resource sets from templating

Examples:

# Look at output for a specific resource set and check to see if it's correct ...
kontemplate template -f example/prod-cluster.yaml -i some-api

# ... maybe do a dry-run to see what kubectl would do:
kontemplate apply -f example/prod-cluster.yaml --dry-run

# And actually apply it if you like what you see:
kontemplate apply -f example/prod-cluster.yaml