Recreate Deployment strategy

deployment-strategies/blue-green/deploy-blue.sh

@@ -1,9 +1,4 @@
 #!/bin/bash
-#primary=$1
-#blue_app=$1
-#blue_svc=$2
-#rs2.yaml
-#service-blue.yaml
-kubectl apply -f $blue_app
-kubectl apply -f $blue_svc
-echo "perform testing of your blue version --curl my-app-blue"
+kubectl apply -f rs2.yaml
+kubectl apply -f service-blue.yaml
+echo "perform testing of your blue version --curl my-app-blue"

deployment-strategies/blue-green/rs1.yaml

@@ -9,12 +9,12 @@ spec:
   replicas: 5
   selector:
     matchLabels:
-      app: my-app
+      app: my-app-team-y
       version: v1.0.0
   template:
     metadata:
       labels:
-        app: my-app
+        app: my-app-team-y
         version: v1.0.0
       annotations:
         prometheus.io/scrape: "true"

deployment-strategies/blue-green/rs2.yaml

@@ -9,12 +9,12 @@ spec:
   replicas: 5
   selector:
     matchLabels:
-      app: my-app
+      app: my-app-team-y
       version: v2.0.0
   template:
     metadata:
       labels:
-        app: my-app
+        app: my-app-team-y
         version: v2.0.0
       annotations:
         prometheus.io/scrape: "true"

deployment-strategies/blue-green/service-blue.yaml

@@ -3,13 +3,13 @@ kind: Service
 metadata:
   name: my-app-blue
   labels:
-    app: my-app
+    app: my-app-team-y
 spec:
   type: NodePort
   ports:
   - name: http
     port: 80
     targetPort: http
   selector:
-    app: my-app
+    app: my-app-team-y
     version: v2.0.0

deployment-strategies/blue-green/service-green.yaml

@@ -3,13 +3,13 @@ kind: Service
 metadata:
   name: my-app-green
   labels:
-    app: my-app
+    app: my-app-team-y
 spec:
   type: NodePort
   ports:
   - name: http
     port: 80
     targetPort: http
   selector:
-    app: my-app
+    app: my-app-team-y
     version: v1.0.0

deployment-strategies/blue-green/tear_down.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+teardown (){
+
+kubectl delete -f rs1.yaml -f rs2.yaml
+kubectl delete -f service-green.yaml -f service-blue.yaml
+}
+teardown

deployment-strategies/k8s_helper.sh

@@ -0,0 +1,44 @@
+function getReplicaCount() {
+    RS_NAME=$1
+    kubectl get rs ${RS_NAME} -o json | jq '.status.readyReplicas'
+}
+
+function apply_manifest() {
+    MANIFEST_FILE=$1
+    kubectl apply -f ${MANIFEST_FILE}
+}
+
+function setReplicaForRS() {
+    RS_NAME=$1
+    RS_DESIRED_COUNT=$2
+    kubectl scale rs --replicas="${RS_DESIRED_COUNT}" ${RS_NAME}
+}
+
+function deleteManifest() {
+    MANIFEST_FILE=$1
+    kubectl delete -f ${MANIFEST_FILE}
+}
+
+function replicaSetStatus() {
+    echo "Status of replicasets"
+    kubectl get rs
+}
+
+function waitForRS() {
+    RS_NAME=$1
+    RS_DESIRED_COUNT=$2
+
+    replica_count=`getReplicaCount ${RS_NAME}`
+    if [ ${RS_DESIRED_COUNT} = "0" ]
+    then
+        #Just handling a boundary 
+        return
+    fi
+    while [ $replica_count != ${RS_DESIRED_COUNT} ] 
+    do
+        echo "Ready replicas of ${RS_NAME}:$replica_count"
+        echo "Wating to reach to ${RS_DESIRED_COUNT}"
+        sleep 1s
+        replica_count=`getReplicaCount ${RS_NAME}`
+    done 
+}

deployment-strategies/nginx-deployment/deployment.yaml

@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+spec:
+  selector:
+    matchLabels:
+      app: nginx
+  replicas: 2 # tells deployment to run 2 pods matching the template
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx
+        ports:
+        - containerPort: 80
+

deployment-strategies/nginx-deployment/service.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: my-nginx
+spec:
+  selector:
+    app: nginx
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 80

deployment-strategies/nginx-deployment/test-ms.yaml

@@ -0,0 +1,26 @@
+test-pod.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: ms
+spec:
+  selector:
+    matchLabels:
+      app: ms
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: ms
+    spec:
+      containers:
+      - name: ms
+        image: rachitsrivastava007/sleep:8
+        ports:
+        - containerPort: 80
+        args:
+            - -c
+            - while true; do echo hello; sleep 10;done
+        command:
+            - /bin/sh
+

deployment-strategies/recreate/Makefile

@@ -0,0 +1,14 @@
+SHELL := /bin/bash
+
+initialSetup: 
+	source recreate.sh;startDeployment
+
+deployment:
+	source recreate.sh;recreateDeployment
+
+rollback:
+	source recreate.sh;rollback
+
+tearDown:
+	source recreate.sh;cleanUp
+

deployment-strategies/recreate/app-v1-deploy.yaml

@@ -0,0 +1,59 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: my-app-v1
+  labels:
+    app: my-app
+spec:
+  replicas: 3
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: my-app-team-z
+  template:
+    metadata:
+      labels:
+        app: my-app-team-z
+        version: v1.0.0
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9101"
+    spec:
+      containers:
+      - name: my-app
+        image: containersol/k8s-deployment-strategies
+        ports:
+        - name: http
+          containerPort: 8080
+        - name: probe
+          containerPort: 8086
+        env:
+        - name: VERSION
+          value: v1.0.0
+        livenessProbe:
+          httpGet:
+            path: /live
+            port: probe
+          initialDelaySeconds: 5
+          periodSeconds: 5
+        readinessProbe:
+          httpGet:
+            path: /ready
+            port: probe
+          periodSeconds: 5
+---
+apiVersion: v1 
+kind: Service
+metadata:
+  name: my-app
+  labels:
+    app: my-app-team-z
+spec:
+  type: NodePort
+  ports:
+  - name: http
+    port: 80
+    targetPort: http
+  selector:
+    app: my-app-team-z

deployment-strategies/rolling-update/rs2.yaml → deployment-strategies/recreate/app-v2-deploy.yaml

@@ -1,19 +1,20 @@
 apiVersion: apps/v1
-kind: ReplicaSet
+kind: Deployment
 metadata:
   name: my-app-v2
   labels:
     app: my-app
 spec:
-  # modify replicas according to your case
-  replicas: 0
+  replicas: 3
+  strategy:
+    type: Recreate
   selector:
     matchLabels:
-      app: my-app
+      app: my-app-team-z
   template:
     metadata:
       labels:
-        app: my-app
+        app: my-app-team-z
         version: v2.0.0
       annotations:
         prometheus.io/scrape: "true"
@@ -41,4 +42,3 @@ spec:
             path: /ready
             port: probe
           periodSeconds: 5
-

deployment-strategies/recreate/recreate.sh

@@ -1,37 +1,31 @@
 #!/bin/bash
+source ../k8s_helper.sh
 
-source recreate_strategy.sh
+function startDeployment() {
+    apply_manifest ../rs1.yaml
+    waitForRS my-app-v1 5
+    apply_manifest ../service.yaml
+    replicaSetStatus
+}
 
-# Creating ReplicaSet and its Service
-kubectl apply -f rs1.yaml
-kubectl apply -f service.yaml
+function recreateDeployment() {
+    setReplicaForRS my-app-v1 0
+    apply_manifest ../rs2.yaml
+    setReplicaForRS my-app-v2 5
+    waitForRS my-app-v2 5
+    replicaSetStatus
+}
 
+function rollback() {
+    setReplicaForRS my-app-v2 0
+    setReplicaForRS my-app-v1 5
+    waitForRS my-app-v1 5
+    replicaSetStatus
+}
 
-replica_count=`kubectl get rs my-app -o json | jq '.status.readyReplicas'`
-while [ $replica_count != 5 ] 
-    do
-        echo "Reday replicas of Version 1 :    $replica_count"
-        sleep 1s
-        replica_count=`kubectl get rs my-app -o json | jq '.status.readyReplicas'`
-    done 
-
-# Current ReplicaSet Host and Version Details
-service=$(minikube service my-app --url)
-version=$(curl "$service")
-echo "Current ReplicaSet host and version -------- $version"
-
-# Scaling ReplicaSet
-echo -n " Do you want to scale Replica set select yes(y) or no(n) -->  "
-read option
-case $option in
-y)
-    rc=0
-    scaleReplicas "$rc"
-;;
-n)
-    exit;
-;;
-*)
-    echo "Invalid option select y to yes and n to exit"
-;;
-esac
+function cleanUp() {
+    deleteManifest ../rs1.yaml
+    deleteManifest ../rs2.yaml
+    deleteManifest ../service.yaml
+    replicaSetStatus
+}

deployment-strategies/recreate/recreate_strategy.sh

@@ -1,23 +1,23 @@
 #!/bin/bash
 
 scaleReplicas(){
-    kubectl scale rs --replicas="$1" my-app
+    kubectl scale rs --replicas="$1" my-app-v1
     # jq needs to be installed through sudo apt install jq
-    replica_count=`kubectl get rs my-app -o json | jq '.status.readyReplicas'`
+    replica_count=`kubectl get rs my-app-v1 -o json | jq '.status.readyReplicas'`
     while [ $replica_count != 'null' ] 
         do
             sleep 1s
-            replica_count=`kubectl get rs my-app -o json | jq '.status.readyReplicas'`
+            replica_count=`kubectl get rs my-app-v1 -o json | jq '.status.readyReplicas'`
         done
 
     kubectl apply -f rs2.yaml
 
-    replica_count=`kubectl get rs my-app -o json | jq '.status.readyReplicas'`
+    replica_count=`kubectl get rs my-app-v2 -o json | jq '.status.readyReplicas'`
     while [ $replica_count != 5 ] 
         do
             echo "Ready Replicas of Version 2 :   $replica_count"
             sleep 1s
-            replica_count=`kubectl get rs my-app -o json | jq '.status.readyReplicas'`
+            replica_count=`kubectl get rs my-app-v2 -o json | jq '.status.readyReplicas'`
         done
 
     echo "Scaling of replicaset v1 to v2 completed"