k8s_rollback: new module (ansible-collections#26)

This module allows user to rollback deployment and daemonsets. Signed-off-by: Julien Huon <julien@huon.email>
tima · Oct 7, 2020 · 0377a89 · 0377a89
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diff --git a/molecule/default/converge.yml b/molecule/default/converge.yml
@@ -29,6 +29,7 @@
     - include_tasks: tasks/log.yml
     - include_tasks: tasks/cluster_info.yml
     - include_tasks: tasks/access_review.yml
+    - include_tasks: tasks/rollback.yml
 
   roles:
     - helm

diff --git a/molecule/default/tasks/rollback.yml b/molecule/default/tasks/rollback.yml
@@ -0,0 +1,217 @@
+---
+- block:
+    - name: Set variables
+      set_fact:
+        namespace: "testingrollback"
+
+    - name: Create a namespace
+      k8s:
+        name: "{{ namespace }}"
+        kind: Namespace
+        api_version: v1
+        apply: no
+      register: output
+
+    - name: show output
+      debug:
+        var: output
+
+    - name: Create a deployment
+      k8s:
+        state: present
+        wait: yes
+        inline: &deploy
+          apiVersion: apps/v1
+          kind: Deployment
+          metadata:
+            name: nginx-deploy
+            labels:
+              app: nginx
+            namespace: "{{ namespace }}"
+          spec:
+            replicas: 3
+            selector:
+              matchLabels:
+                app: nginx
+            template:
+              metadata:
+                labels:
+                  app: nginx
+              spec:
+                containers:
+                  - name: nginx
+                    image: nginx:1.17
+                    ports:
+                      - containerPort: 80
+      register: output
+
+    - name: Show output
+      debug:
+        var: output
+
+    - name: Crash the existing deployment
+      k8s:
+        state: present
+        wait: yes
+        definition:
+          apiVersion: apps/v1
+          kind: Deployment
+          metadata:
+            name: nginx-deploy
+            labels:
+              app: nginx
+            namespace: "{{ namespace }}"
+          spec:
+            replicas: 3
+            selector:
+              matchLabels:
+                app: nginx
+            template:
+              metadata:
+                labels:
+                  app: nginx
+              spec:
+                containers:
+                  - name: nginx
+                    image: nginx:1.0.23449928384992872784
+                    ports:
+                      - containerPort: 80
+      ignore_errors: yes
+      register: output
+
+    - name: Rolling Back the crashed deployment
+      k8s_rollback:
+        api_version: apps/v1
+        kind: Deployment
+        name: nginx-deploy
+        namespace: "{{ namespace }}"
+      when: output.failed
+      register: output
+
+    - name: Show output
+      debug:
+        var: output
+
+    - name: Create a DaemonSet
+      k8s:
+        state: present
+        wait: yes
+        definition:
+          apiVersion: apps/v1
+          kind: DaemonSet
+          metadata:
+            name: fluentd-elasticsearch
+            namespace: "{{ namespace }}"
+            labels:
+              k8s-app: fluentd-logging
+          spec:
+            selector:
+              matchLabels:
+                name: fluentd-elasticsearch
+            template:
+              metadata:
+                labels:
+                  name: fluentd-elasticsearch
+              spec:
+                tolerations:
+                  - key: node-role.kubernetes.io/master
+                    effect: NoSchedule
+                containers:
+                  - name: fluentd-elasticsearch
+                    image: quay.io/fluentd_elasticsearch/fluentd:v2.5.2
+                    resources:
+                      limits:
+                        memory: 200Mi
+                      requests:
+                        cpu: 100m
+                        memory: 200Mi
+                    volumeMounts:
+                      - name: varlog
+                        mountPath: /var/log
+                      - name: varlibdockercontainers
+                        mountPath: /var/lib/docker/containers
+                        readOnly: true
+                terminationGracePeriodSeconds: 30
+                volumes:
+                  - name: varlog
+                    hostPath:
+                      path: /var/log
+                  - name: varlibdockercontainers
+                    hostPath:
+                      path: /var/lib/docker/containers
+      register: output
+
+    - name: Show output
+      debug:
+        var: output
+
+    - name: Crash the existing DaemonSet
+      k8s:
+        state: present
+        wait: yes
+        definition:
+          apiVersion: apps/v1
+          kind: DaemonSet
+          metadata:
+            name: fluentd-elasticsearch
+            namespace: "{{ namespace }}"
+            labels:
+              k8s-app: fluentd-logging
+          spec:
+            selector:
+              matchLabels:
+                name: fluentd-elasticsearch
+            template:
+              metadata:
+                labels:
+                  name: fluentd-elasticsearch
+              spec:
+                tolerations:
+                  - key: node-role.kubernetes.io/master
+                    effect: NoSchedule
+                containers:
+                  - name: fluentd-elasticsearch
+                    image: quay.io/fluentd_elasticsearch/fluentd:v2734894949
+                    resources:
+                      limits:
+                        memory: 200Mi
+                      requests:
+                        cpu: 100m
+                        memory: 200Mi
+                    volumeMounts:
+                      - name: varlog
+                        mountPath: /var/log
+                      - name: varlibdockercontainers
+                        mountPath: /var/lib/docker/containers
+                        readOnly: true
+                terminationGracePeriodSeconds: 30
+                volumes:
+                  - name: varlog
+                    hostPath:
+                      path: /var/log
+                  - name: varlibdockercontainers
+                    hostPath:
+                      path: /var/lib/docker/containers
+      ignore_errors: yes
+      register: output
+
+    - name: Rolling Back the crashed DaemonSet
+      k8s_rollback:
+        api_version: apps/v1
+        kind: DaemonSet
+        name: fluentd-elasticsearch
+        namespace: "{{ namespace }}"
+      when: output.failed
+      register: output
+
+    - name: Show output
+      debug:
+        var: output
+
+  always:
+    - name: Delete {{ namespace }} namespace
+      k8s:
+        name: "{{ namespace }}"
+        kind: Namespace
+        api_version: v1
+        state: absent