Metadata-Version: 2.1
Name: ok8deploy
Version: 1.0.2
Summary: Simple Openshift / K8 template engine with state tracking
Home-page: https://github.com/davidgiga1993/OpenK8Deploy
Author: davidgiga1993
Author-email: david@dev-core.org
License: UNKNOWN
Description: # Openshift/K8 templating and deployment engine
        Super simple python templating and deployment engine for openshift/k8 yml files.
        Detects changes made and only applies the required objects.
        
        ## Use case
        This tool was born in the need to a very simple templating system
        which can track changes (similar to terraform). It was build for my requirements but should
        fit others as well.
        
        ## Requirements
        - Python 3.8 or later
        - `oc` (or `kubectl`) binary in path
        
        ## Usage
        ### Deploy all changes
        Deploys all enabled app 
        ```
        python deploy.py deploy-all
        ```
        
        ### Deploy single app
        Deploys all object of the app with the give name
        ```
        python deploy.py deploy nginx
        ```
        
        ### Reload config
        This command executes the `on-config-change` trigger
        ```
        python deploy.py reload prometheus
        ```
        
        
        ## Configuration
        In OK8Deploy you define apps, each app can contain multiple yml files.
        Additionally, there is a project configuration which describes the openshift project.
        
        All yml files will be pre-processed before they will be imported.
        This includes replacing any known `${KEY}` variables with their associate values and merging referenced templates.
        
        ### Config structure
        ```
        configs
        |- _root.yml <- Project config
        |- my-app <- App
            |- _index.yml <- App config
            |- dc.yml <- Openshift yml file(s)
            |- secrets.yml
        ```
        
        ### Project config
        Here is a sample `_root.yml` file
        ```yml
        project: 'my-oc-project'
        
        # OPTIONAL STUFF
        # Global variables
        vars:
          DOMAIN: "dev-core.org"
        ```
        
        ### App config
        An app is represented by a folder containing an `_index.yml` file and any additional openshift yml files.
        The following shows all available parameters. Only the first 3 are required.
        ```yml
        # The type defines how the app will be used.
        # Can be "app" (default) or "template"
        type: 'app'
        
        # Indicates if this app should be deployed or ignored
        enabled: true 
        
        # Deployment config parameters
        dc:
            # Name of the deployment config, available as variable, see below
            name: 'my-app'
        
        # Template which should be applied, none by default
        applyTemplates: []
        
        # Templates which should be applied AFTER processing the other templates and base yml files
        postApplyTemplates: []
        
        # Action which should be executed if a configmap has been changed
        on-config-change:
        # Available options: 
        # deploy (re-deploys the deployment config)
          - deploy
        
        # exec (Executes a command inside the running container)
          - exec: 
              command: /bin/sh
              args: 
                - "-c"
                - "kill -HUP $(ps a | grep prometheus | grep -v grep | awk '{print $1}')"
        
        # Additional variables which are used for replacements
        vars:
          NSQ_NAME: 'nsq-core'
        
        # Required parameters which must be passed to this app.
        # This can be done via the CLI or if this app is a template the referring app can define it in "vars" 
        params:
          - PASSWORD
        
        # File based configmaps
        configmaps:
          - name: nginx-config
            files:
              - file: "nginx.conf"
        ```
        
        ### Configmaps
        In addition to the regular configmaps you can also define configmaps with a file source.
        This is done in the `_index.yml` file:
        ```yml
        configmaps:
          - name: nginx-config
            files:
              - file: "nginx.conf"
        ```
        This will create a new configmap from the file `nginx.conf` with the name `nginx-config`.
        Any changes made to the file will be automatically deployed.
        
        ### Variables
        You can refer to variables in yml files by using `${VAR-NAME}`. Variables can also be loaded from files.
        
        ```yml
        # _index.yml
        vars:
          # Regular key/value assignment
          key: value
          
          # This will load the public/private and intermediate certs
          # from a pem file and store it in *_KEY, *_PUBLIC, *_CACERT
          # where * is the key of the value (CERT in this example)
          CERT:
            loader: pem
            file: my-cert.pem
        ```
        
        It is also possible to decorate objects using variables:
        ```yml
        # _index.yml
        vars:
          someMerging:
            hello: world
            replicas: 2
        ```
        
        ```yml
        # dc.yml
        spec:
          replicas: 1
          _ok8merge: ${someMerging}
        ```
        
        Results in:
        ```yml
        spec:
          replicas: 2
          hello: world
        ```
        
        ### Global variables
        The following variables are available anywhere inside the yml files by default
        
        | Key | Value |
        | --- | --- | 
        | `DC_NAME` | Name of the deployment-config in the `_index.yml` |
        | `OC_PROJECT` | Name of the openshift project in `_root.yml` |
        
        ### Templates
        You can use templates to reuse and generate yml files.
        To do so you create a new app with the `type` field set to `template`.
        Other apps can now refer to this template via the `applyTemplates` or `postApplyTemplates` field. 
        Templates can refer to other templates (recursively). Any vars defined are passed to the next template. 
        
        Example:
        ```
        |- some-template
            |- _index.yml
            |- dc.yml
        
        |- my-app
            |- _index.yml <-- Referes to "some-template"
            |- others.yml
        ```
        
        Will result in
        ```
        |- my-app
            |- _index.yml
            |- others.yml
            |- dc.yml
        ```
        
        #### Object merging
        The template engine support content aware object merging.
        This allows you to decorate existing templates or enhance apps with features.
        A common example would be a template which adds a monitoring sidecar container.
        In the `examples` you can find the `nsq-template` which defines a sidecar container.
        
        Here is a minimal example:
        ```yml
        # examples/nsq-template/dc.yml
        kind: DeploymentConfig
        apiVersion: v1
        spec:
            template:
                spec:
                containers:
                    - name: "nsqd"
                    image: "nsqio/nsq"
        ```
        
        ```yml
        # examples/my-app/dc.yml
        kind: DeploymentConfig
        apiVersion: v1
        metadata:
          name: "${DC_NAME}"
        
        spec:
          replicas: 1
          selector:
            name: "${DC_NAME}"
          strategy:
            type: Rolling
        
          template:
            metadata:
              labels:
                name: "${DC_NAME}"
        
            spec:
              containers:
                - name: "${DC_NAME}"
                  image: "docker-registry.default.svc:5000/oc-project/my-app:prod"
        ```
        
        If we now apply the nsq-template to our app using `postApplyTemplates: [nsq-template]` the
        `DeploymentConfig` object gets automatically merged:
        ```yml
        # Merged result after applying template
        kind: DeploymentConfig
        apiVersion: v1
        metadata:
          name: "${DC_NAME}"
        
        spec:
          replicas: 1
          selector:
            name: "${DC_NAME}"
          strategy:
            type: Rolling
        
          template:
            metadata:
              labels:
                name: "${DC_NAME}"
        
            spec:
              containers:
                - name: "${DC_NAME}"
                  image: "docker-registry.default.svc:5000/oc-project/my-app:prod"
                # This is the part of the template
                - name: "nsqd"
                    image: "nsqio/nsq"
        ```
        
        #### Loops
        Loops allow you to apply the same template with different parameters.
        This is useful when deploying microservices which all have the same openshift config.
        
        ```yml
        # _index.yml
        enabled: true
        applyTemplates: [ api-template ]
        forEach: 
            # DC_NAME is required for each instance that should be created
          - DC_NAME: entity-compare-api
            # You can define other vars as well
            PORT: 8080
        
          - DC_NAME: favorite-api
            PORT: 8081
        ```
        
        #### Library
        It's possible to define whole project as a `library`. This allows all apps and templates to be reused
        by another project. An example would be the same setup for multiple systems which are separated by projects (e.g. `dev/test/prod`).
        
        ```yml
        # testLib/_root.yml
        type: library
        
        # Required parameters
        params:
          - domain
          - dockerDomain
          - imageStreamTag
        ```
        ```yml
        # prod/_root.yml
        project: 'prod-project'
        inherit: testLib
        
        # Required parameters
        vars:
          domain: my-prod.dev-core.org
          dockerDomain: prod-docker.com
          imageStreamTag: prod
        ```
        When you now deploy the `prod` project it will inherit all apps inside `testLib`.
        
        ## Change tracking
        Changes are detected by storing a md5 sum in the label of the object.
        If this hash has changed the whole object will be applied.
        If no label has been found in openshift the object is assumed to be equal, and the label is added.
        
        ## Examples
        All examples can be found in the `examples` folder.
        ### Grafana
        The grafana folder contains a basic grafana setup.
        
        ### NSQ
        This example adds an NSQ sidecar container to a deployment config.
        
        
        `my-app/_index.yml`
        ```yml
        enabled: true
        postApplyTemplates: [nsq-template]
        vars:
          NSQ_NAME: 'app-nsq'
        
        dc:
          name: my-app
        ```
        
        
        
        ## Contribute
        The code should be mostly commented. If you found a bug or want to improve something feel free to open an issue and discuss your ideas.
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Programming Language :: Python :: 3
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Classifier: Topic :: Software Development :: Libraries
Description-Content-Type: text/markdown
