add jsonnet examples

Author: jessesuen

chapter-03/jsonnet/advanced.jsonnet

@@ -0,0 +1,35 @@
+function(prod=false) {                    # A, B 
+   "apiVersion": "apps/v1",
+   "kind": "Deployment",
+   "metadata": {
+      "name": "nginx"
+   },
+   "spec": {
+      "selector": {
+         "matchLabels": {
+            "app": $.metadata.name        # C
+         }
+      },
+      "replicas": if prod then 10 else 1, # D
+      "template": {
+         "metadata": {
+            "labels": {
+               "app": $.metadata.name
+            }
+         },
+         "spec": {
+            "containers": [
+               {
+                  "name": $.metadata.name,
+                  "image": "nginx:1.14.2",
+                  "ports": [
+                     {
+                        "containerPort": 80
+                     }
+                  ]
+               }
+            ]
+         }
+      }
+   }
+}

chapter-03/jsonnet/basic.jsonnet

@@ -0,0 +1,36 @@
+{
+   // Look! It's JSON with comments!
+   "apiVersion": "apps/v1",
+   "kind": "Deployment",
+   "metadata": {
+      "name": "nginx"
+   },
+   "spec": {
+      "selector": {
+         "matchLabels": {
+            "app": "nginx"
+         }
+      },
+      "replicas": 2,
+      "template": {
+         "metadata": {
+            "labels": {
+               "app": "nginx"
+            }
+         },
+         "spec": {
+            "containers": [
+               {
+                  "name": "nginx",
+                  "image": "nginx:1.14.2",
+                  "ports": [
+                     {
+                        "containerPort": 80
+                     }
+                  ]
+               }
+            ]
+         }
+      }
+   }
+}

chapter-03/jsonnet/variables.jsonnet

@@ -0,0 +1,38 @@
+local name = "nginx";
+local version = "1.14.2";
+local replicas = 2;
+{
+   "apiVersion": "apps/v1",
+   "kind": "Deployment",
+   "metadata": {
+      "name": name
+   },
+   "spec": {
+      "selector": {
+         "matchLabels": {
+            "app": name
+         }
+      },
+      "replicas": replicas,
+      "template": {
+         "metadata": {
+            "labels": {
+               "app": name
+            }
+         },
+         "spec": {
+            "containers": [
+               {
+                  "name": name,
+                  "image": "nginx:" + version,
+                  "ports": [
+                     {
+                        "containerPort": 80
+                     }
+                  ]
+               }
+            ]
+         }
+      }
+   }
+}