[Refactor] pod_failure_by_litmus to use ansible k8s module

chaoslib/litmus/kill_random_pod.yml

@@ -0,0 +1,34 @@
+- name: Get a list of all pods from given namespace
+  k8s_facts:
+    kind: Pod
+    namespace: "{{ a_ns }}"
+    label_selectors:
+      - "{{a_label}}"
+  register: pod_list
+
+- name: Select a random pod to kill
+  set_fact:
+    a_pod_to_kill: "{{ pod_list.resources | random | json_query('metadata.name') }}"
+
+- debug:
+    msg: "Killing pod {{a_pod_to_kill}}"
+
+- name: Force Kill application pod
+  shell: |
+    kubectl delete pod -n {{ a_ns }} --force --grace-period=0 --wait=false {{a_pod_to_kill}}
+  args:
+    executable: /bin/bash
+  register: result
+  when: "c_force == 'true'"
+
+- name: Kill application pod
+  shell: |
+    kubectl delete pod -n {{ a_ns }} --grace-period=0 --wait=false {{a_pod_to_kill}}
+  args:
+    executable: /bin/bash
+  register: result
+  when: "c_force == 'false' or c_force == ''" 
+
+- name: Wait for the interval timer
+  pause:
+    seconds: "{{c_interval}}"

chaoslib/litmus/pod_failure_by_litmus.yml

@@ -7,22 +7,7 @@
     chaos_iterations: 1
   when: "chaos_iterations == '0'" 
 
-- name: Kill application pods randomly for the specified duration
-  shell: |
-    kubectl get pods -l {{ a_label }} -n {{ a_ns }} --no-headers -o custom-columns=:metadata.name | shuf -n 1 | xargs kubectl delete pod -n {{ a_ns }} --force --grace-period=0 --wait=false
-    sleep {{ c_interval }}
-  args:
-    executable: /bin/bash
-  register: result
+- name: Kill random pod
+  include: kill_random_pod.yml
   with_sequence: start=1 end={{ chaos_iterations }}
-  when: "c_force == 'true'"
-
-- name: Kill application pods randomly for the specified duration
-  shell: |
-    kubectl get pods -l {{ a_label }} -n {{ a_ns }} --no-headers -o custom-columns=:metadata.name | shuf -n 1 | xargs kubectl delete pod -n {{ a_ns }}
-    sleep {{ c_interval }}
-  args:
-    executable: /bin/bash
-  register: result
-  with_sequence: start=1 end={{ chaos_iterations }}
-  when: "c_force == 'false' or c_force == ''" 
+