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https://github.com/alfiankan/crab-config-files-templating

Dynamic configuration file templating tool for kubernetes manifest or general configuration files
https://github.com/alfiankan/crab-config-files-templating

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Dynamic configuration file templating tool for kubernetes manifest or general configuration files

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# Crab 🦀

Dynamic configuration file templating tool for kubernetes manifest or general configuration files



[![codecov](https://codecov.io/gh/alfiankan/crab-config-files-templating/branch/master/graph/badge.svg?token=DJHuZmbYeU)](https://codecov.io/gh/alfiankan/crab-config-files-templating)

[![Go Reference](https://pkg.go.dev/badge/github.com/alfiankan/crab-config-files-templating.svg)](https://pkg.go.dev/github.com/alfiankan/crab-config-files-templating)

[![Go Report Card](https://goreportcard.com/badge/github.com/alfiankan/crab-config-files-templating)](https://goreportcard.com/report/github.com/alfiankan/crab-config-files-templating)

[![Generate release-artifacts](https://github.com/alfiankan/crab-config-files-templating/actions/workflows/go.yml/badge.svg?branch=v1.0.5)](https://github.com/alfiankan/crab-config-files-templating/actions/workflows/go.yml)

[![Mentioned in Awesome Go](https://awesome.re/mentioned-badge.svg)](https://github.com/avelino/awesome-go)  



## How to install



Download according to your computer architecture at release page [go to release page](https://github.com/alfiankan/crab-config-files-templating/releases)



| OS        | Platform           | Status  |

| ------------- |:-------------:| -----:|

| Ubuntu, Debian | amd64, arm64, 386| available |

| MacOS, Darwin  | amd64, arm64, 386| available |

| Windows | amd64, arm64, 386| available |



Extract using command like :

```bash

tar -xzf crab-cli-v0.1.0-darwin-amd64.tar.gz -C crab

```



Move to /usr/local/bin (Optional) :

```bash

cp crab/crab /usr/local/bin

```



Then check crab cli working properly :



## Build From Source

- clone this repository

- make sure you have go version 18

- run `make build`



## How to use

basic command fromat :

```bash

  crab -f  -r  -o 

```

Flags :

| Flag       | Description           | Required  | default |

| :------------- |:-------------| :-----| :-----|

| -f | file input path location eg. ./manifest/nginx.yaml (accept any config file ext, .env, json, yml, yaml etc.) | true | - |

| -o  | write output file location eg. ./manifest/nginx-result.yaml | false  | same as input file path (overwrite) |

| -r | key value replacable | true | - |

| -q | key value replacable with quotes | false | - |

| -v | verbose process | false | false |



### Case 1 Standart replace

First add {{replacableName}} to your file :

```yaml

apiVersion: v1

kind: Service

metadata:

    name: nginx

    namespace: {{namespace}}

spec:

    ports:

      - targetPort: 80

        name: nginxhttp

        port: {{exposePort}}

```

crab cli will replace {{replacableName}} as the key, based on the example above :

- {{namespace}}

- {{exposePort}}



then run crab command :

```bash

  crab -f inputfile.yaml -r namespace=production -r exposePort=8081

```

yes you can override multiple key values  ✔️

  

write output to another file add -o flag:

```bash

  crab -f inputfile.yaml -r namespace=production -r exposePort=8081 -o result.yaml

```

  

to make verbose add -v flag:

```bash

  crab -f inputfile.yaml -r namespace=production -r exposePort=8081 -o result.yaml -v

```

verbose output :

```bash

[REPLACED] from namespace to production

[REPLACED] from exposePort to 8081

[DONE] Crab output result at result.yaml

```



the result will be :

```yaml

apiVersion: v1

kind: Service

metadata:

    name: nginx

    namespace: production

spec:

    ports:

      - targetPort: 80

        name: nginxhttp

        port: 8081

```

Click to watch the demo :

[![asciicast](https://asciinema.org/a/E76kRn2G8uoIXBm6KZPtPn27x.svg)](https://asciinema.org/a/E76kRn2G8uoIXBm6KZPtPn27x)



Youtube demo video :

- [go to youtube](https://youtu.be/HdRQ3mz64us)



  

### Case 2 Quotes replace

sometimes your config file needs string quotes, (like for env vars or connection string):

  ```sh

    namespace="production"

  ```

template file example :

```yaml

apiVersion: v1

kind: Service

metadata:

    name: nginx

    namespace: {{namespace}}

spec:

    ports:

      - targetPort: 80

        name: nginxhttp

        port: {{exposePort}}

```

let's say we need a quote in the namespace :

```bash

  crab -f inputfile.yaml -q namespace=production -r exposePort=8081 -o result.yaml -v

```

yass you can simultaneously Replace multiple key values with quotes or not  ✔️



result will be :

```yaml

apiVersion: v1

kind: Service

metadata:

    name: nginx

    namespace: "production"

spec:

    ports:

      - targetPort: 80

        name: nginxhttp

        port: 8081

```



## Sample Github Action



```yaml

name: Demo deployment using crab



on:

  workflow_dispatch:



jobs:

  crab-manifest:

    runs-on: ubuntu-latest

    steps:

      - uses: actions/checkout@v3

      - name: mock job

        run: pwd



  deploy-test:

    runs-on: ubuntu-latest

    needs: crab-manifest

    steps:

      - uses: actions/checkout@v3

      - name: install crab cli

        run: wget -c https://github.com/alfiankan/crab-config-files-templating/releases/download/v1.0.5/crab-v1.0.5-linux-amd64.tar.gz -O - | tar -xz crab

      - name: recreate deployment manifest on test

        run: |

          ./crab -f example/manifest/nginx.yaml \

          -r namespace=test \

          -r publishPort=8000 \

          -q portName=test-server \

          -o nginx-test.yaml \

          -v

      - name: view manifest

        run: cat nginx-test.yaml

                    

  

  deploy-production:

    runs-on: ubuntu-latest

    needs: crab-manifest

    steps:

      - uses: actions/checkout@v3

      - name: install crab cli

        run: wget -c https://github.com/alfiankan/crab-config-files-templating/releases/download/v1.0.5/crab-v1.0.5-linux-amd64.tar.gz -O - | tar -xz crab

      - name: recreate deployment manifest on production

        run: |

          ./crab -f example/manifest/nginx.yaml \

          -r namespace=production \

          -r publishPort=80 \

          -q portName=prod-server \

          -o nginx-prod.yaml \

          -v

      - name: view manifest

        run: cat nginx-prod.yaml

```



## Related article

- Replacing kubernetes manifest value dynamicly (coming soon on medium)