Initial commit

Author: ProProgrammer

.gitignore

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+.idea/

Demo1/configmap.yaml

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+# Pod using this configmap: pod-cmd.yaml in same directory
+
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: log-config
+  namespace: default
+data:
+  log.level: WARNING
+  log.location: LOCAL

Demo1/demo.sh

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+# Deploy the ConfigMap
+kubectl create -f configmap.yaml
+
+# Create the Pod with Env Var
+kubectl create -f pod-cmd.yaml
+
+# Check the logs
+kubectl logs test-pod-cmd
+
+# Create the pod with Env Var
+kubectl create -f pod-env.yaml
+
+# Check the env vars
+kubectl exec -it test-pod-env /bin/sh
+
+# Create the pod with Env Var
+kubectl create -f pod-vol.yaml
+
+# Check the logs
+kubectl logs test-pod-vol
+
+# Access the shell
+kubectl exec -it test-pod-vol /bin/sh
+
+# Check the files
+cd /etc/config
+cat log.level
+cat log.location

Demo1/pod-cmd.yaml

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+# Config Map used: configmap.yaml in same directory
+
+apiVersion: v1
+kind: Pod
+metadata:
+  name: test-pod-cmd
+spec:
+  containers:
+    - name: test-container
+      image: gcr.io/google_containers/busybox
+      command: ["/bin/sh", "-c", "echo Error Level: $(LOG_LEVEL) - Error Location: $(LOG_LOCATION)"]
+      env:
+        - name: LOG_LEVEL
+          valueFrom:
+            configMapKeyRef:
+              name: log-config
+              key: log.level
+        - name: LOG_LOCATION
+          valueFrom:
+            configMapKeyRef:
+              name: log-config
+              key: log.location
+  restartPolicy: Never

Demo1/pod-env.yaml

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+# Config Map used: configmap.yaml in same directory
+
+apiVersion: v1
+kind: Pod
+metadata:
+  name: test-pod-env
+spec:
+  containers:
+    - name: test-container
+      image: gcr.io/google_containers/busybox
+      command: ["/bin/sh", "-c", "--"]
+      args: ["while true; do sleep 30; done;"]
+      env:
+        - name: LOG_LEVEL
+          valueFrom:
+            configMapKeyRef:
+              name: log-config
+              key: log.level
+        - name: LOG_LOCATION
+          valueFrom:
+            configMapKeyRef:
+              name: log-config
+              key: log.location
+  restartPolicy: Never

Demo1/pod-vol.yaml

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+# Config Map used: configmap.yaml in same directory
+
+apiVersion: v1
+kind: Pod
+metadata:
+  name: test-pod-vol
+spec:
+  containers:
+    - name: test-container
+      image: gcr.io/google_containers/busybox
+      command: ["/bin/sh", "-c", "--"]
+      args: ["while true; do sleep 30; done;"]
+      volumeMounts:
+        - name: config-volume
+          mountPath: /etc/config
+  volumes:
+    - name: config-volume
+      configMap:
+        name: log-config
+  restartPolicy: Never

Demo2/demo.sh

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+# Create the ConfigMap from the configuration file
+kubectl create configmap example-redis-config --from-file=redis-config
+
+# Show the ConfigMap in YAML format
+kubectl get configmap example-redis-config -o yaml
+
+# Create the Redis pod
+kubectl create -f redis.yaml
+
+# Check the pod; wait for the pod to be created
+kubectl get pods
+
+# Check the configuration
+kubectl exec -it redis redis-cli
+
+# Execute the following commands in Redis shell at 127.0.0.1:6379
+CONFIG GET maxmemory
+CONFIG GET maxmemory-policy
+
+# Clean up
+kubectl delete configmap example-redis-config
+kubectl delete pod redis

Demo2/redis-config-kabacanamg

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+maxmemory 5mb
+maxmemory-policy allkeys-lru

Demo2/redis.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: redis
+spec:
+  containers:
+    - name: redis
+      image: kubernetes/redis:v1
+      env:
+        - name: MASTER
+          value: "true"
+      ports:
+        - containerPort: 6379
+      resources:
+        limits:
+          cpu: "0.1"
+      volumeMounts:
+        - mountPath: /redis-master-data
+          name: data
+        - mountPath: /redis-master
+          name: config
+  volumes:
+    - name: data
+      emptyDir: {}
+    - name: config
+      configMap:
+        name: example-redis-config
+        items:
+          - key: redis-config-kabacanamg
+            path: redis.conf

Overview of ConfigMap.yml

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+kind: ConfigMap
+apiVersion: v1
+metadata:
+  creationTimestamp: 2017-12-04T13:55:41+00:00
+  name: example-config
+  namespace: default
+# Data Section that contains multiple key-value pairs
+data:
+  example.property.1: hello
+  example.property.2: world
+  example.property.file: |-
+    property.1=value-1
+    property.2=value-2
+    property.3=value-3
+
+
+
+# We can also create a configMap from an existing file that already contains configuration
+
+# Example configMap:
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: special-config
+  namespace: default
+data:
+  special.how: very
+  special.type: charm
+
+# Example pod using the "special-config" ConfigMap
+apiVersion: v1
+kind: Pod
+metadata:
+  name: dapi-test-pod
+spec:
+  containers:
+    - name: test-container
+      image: gcr.io/xyz
+      command: ["/bin/sh", "-c", "env"]
+      env:
+        - name: SPECIAL_LEVEL_KEY
+          valueFrom:
+            configMapKeyRef:
+              name: special-config
+              key: special.how
+        - name: SPECIAL_TYPE_KEY
+          valueFrom:
+            configMapKeyRef:
+              name: special-config
+              key: special.type
+  restartPolicy: Never
+
+
+# Configuration data can be consumed in pods in a variety of ways
+#
+# ConfigMap can be used to:
+# 1. Populate the value of environment variable
+# 2. Set command-line arguments in a container
+# 3. Populate the configuration files in a volume
+#
+# Users and system components may store configuration data in a ConfigMap
+
+