Jsonnet template for Kubernetes

service-deployment-ingress.jsonnet.template

// Template for a basic service, deployment and ingress

{
    // Required arguments for this template
    serviceName:: error "serviceName must be specified",
    dockerImage:: error "dockerImage must be specified",
    servicePort:: error "servicePort must be specified",
    servicePortType:: "ClusterIP",
    namespace:: "default",
    host:: "mysterious-grass-savages.github",
    url:: error "URL must be specified",
    environment:: "dev",    

    //optional arguments
    serviceAccountName:: "",
    volumeMounts:: {},
    env:: {},
    volumes:: {},
    livenessProbe:: {},
    readinessProbe:: {},
    replicas:: {},

    local service = {
        apiVersion: "v1",
        kind: "Service",
        metadata: {
            name: $.serviceName + "-service",
        },
        spec: {
            selector: {
                app: $.serviceName 
            },
            ports: [
                {
                    protocol: "TCP",
                    port: $.servicePort,
                    targetPort: $.servicePort
                },
            ],
            type: $.servicePortType,
        },
    },

    local deployment = {
        "apiVersion": "apps/v1",
        "kind": "Deployment",
        "metadata": {
            "name": $.serviceName + "-deployment",
            "labels": {
                "app": $.serviceName,
                "environment": $.environment,
            }
        },
        "spec": {
            "replicas": if std.length($.replicas) > 0 then std.parseInt($.replicas) else 2,
            "selector": {
                "matchLabels": {
                    "app": $.serviceName
                }
            },
            "template": {
                "metadata": {
                    "labels": {
                        "app": $.serviceName
                    }
                },
                "spec": {
                    "containers": [
                        {
                            "name": $.serviceName,
                            "image": $.dockerImage,
                            "ports": [
                                {
                                    "name": "container-port",
                                    "containerPort": $.servicePort
                                }
                            ],
                            
                            [if std.length($.volumeMounts) > 0 then "volumeMounts"]: [ item
                                for item in $.volumeMounts
                            ],
                            [if std.length($.env) > 0 then "env"]: [ item
                                for item in $.env
                            ],
                            [if std.length($.livenessProbe) > 0 then "livenessProbe"]: if std.length($.livenessProbe) > 0 then $.livenessProbe ,
                            [if std.length($.readinessProbe) > 0 then "readinessProbe"]: if std.length($.readinessProbe) > 0 then $.readinessProbe ,
                        }
                    ],
                    [if std.length($.volumes) > 0 then "volumes"]: [ item
                            for item in $.volumes
                    ],
                    [if std.length($.serviceAccountName) > 0 then "serviceAccountName"]: if std.length($.livenessProbe) > 0 then $.serviceAccountName
                }
            }
        }
    },

    local ingress = {
        "apiVersion": "extensions/v1beta1",
        "kind": "Ingress",
        "metadata": {
            "name": $.serviceName + "-ingress",
            "namespace": $.namespace,
        },
         "spec": {
            "rules": [
                {
                    "host": $.host,
                    "http": {
                        "paths": [
                            {
                                "path": $.url,
                                "backend": {
                                    "serviceName": $.serviceName + "-service",
                                    "servicePort": $.servicePort 
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },

    apiVersion: "v1",
    kind: "List",
    items: [service, ingress, deployment],
}