feat: add poddisruptionbudget (#66)

* feat: add poddisruptionbudget patches

* test: update pdb

* test: include pdbs in patches

* test: using kustomization

* test: include in resources

* fix: include conditional for mfe and forum

* fix: correct endlines

* feat: pdb value parametrizable

* fix: delete undefined variable

* fix: drydock variable names

* fix: change comparison operator and pdb path

Author: marbonilla

README.rst

@@ -57,6 +57,13 @@ The following configuration options are available:
 - `DRYDOCK_ENABLE_SENTRY` : Whether to enable sentry. Defaults to `true`.
 - `DRYDOCK_SENTRY_DSN` : The sentry DSN. Defaults to `""`.
 - `DRYDOCK_POD_LIFECYCLE` : Whether to enable pod lifecycle. Defaults to `true`.
+- `DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_MFE` : The minimum available percentage for the MFE's PodDisruptionBudget. To disable the PodDisruptionBudget, set `0`. Defaults to `0`.
+- `DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_FORUM` : The minimum available percentage for the FORUM's PodDisruptionBudget. To disable the PodDisruptionBudget, set `0`. Defaults to `0`.
+- `DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CADDY` : The minimum available percentage for the CADDY's PodDisruptionBudget. To disable the PodDisruptionBudget, set `0`. Defaults to `0`.
+- `DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_LMS` : The minimum available percentage for the LMS's PodDisruptionBudget. To disable the PodDisruptionBudget, set `0`. Defaults to `0`.
+- `DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_LMS_WORKER` : The minimum available percentage for the LMS WORKER's PodDisruptionBudget. To disable the PodDisruptionBudget, set `0`. Defaults to `0`.
+- `DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CMS` : The minimum available percentage for the CMS's PodDisruptionBudget. To disable the PodDisruptionBudget, set `0`. Defaults to `0`.
+- `DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CMS_WORKER` : The minimum available percentage for the worker's PodDisruptionBudget. To disable the PodDisruptionBudget, set `0`. Defaults to `0`.
 
 Rationale
 ---------

drydock/patches/kustomization-resources

@@ -1,4 +1,5 @@
 - plugins/drydock/k8s/multipurpose-jobs.yml
+- plugins/drydock/k8s/pdb/openedx-pdb.yml
 {%- if DRYDOCK_INIT_JOBS %}
 - plugins/drydock/k8s/drydock-jobs/mysql.yml
 - plugins/drydock/k8s/drydock-jobs/mongodb.yml

drydock/plugin.py

@@ -31,6 +31,13 @@
         "SENTRY_DSN": "",
         "POD_LIFECYCLE": True,
         "BYPASS_CADDY": False,
+        "PDB_MINAVAILABLE_PERCENTAGE_LMS": 0,
+        "PDB_MINAVAILABLE_PERCENTAGE_LMS_WORKER": 0,
+        "PDB_MINAVAILABLE_PERCENTAGE_CMS": 0,
+        "PDB_MINAVAILABLE_PERCENTAGE_CMS_WORKER": 0,
+        "PDB_MINAVAILABLE_PERCENTAGE_MFE": 0,
+        "PDB_MINAVAILABLE_PERCENTAGE_FORUM": 0,
+        "PDB_MINAVAILABLE_PERCENTAGE_CADDY": 0,
     },
     # Add here settings that don't have a reasonable default for all users. For
     # instance: passwords, secret keys, etc.

drydock/templates/drydock/k8s/pdb/openedx-pdb.yml

@@ -0,0 +1,84 @@
+{%- if MFE_HOST is defined and DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_MFE > 0 %}
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: mfe-pdb
+spec:
+  minAvailable: {{DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_MFE}}%
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: mfe
+{%- endif %}
+{%- if FORUM_DOCKER_IMAGE is defined and DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_FORUM > 0 %}
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: forum-pdb
+spec:
+  minAvailable: {{DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_FORUM}}%
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: forum
+{%- endif %}
+{%- if DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CADDY > 0 %}
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: caddy-pdb
+spec:
+  minAvailable: {{DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CADDY}}%
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: caddy
+{%- endif %}
+{%- if DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_LMS > 0 %}
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: lms-pdb
+spec:
+  minAvailable: {{DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_LMS}}%
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: lms
+{%- endif %}
+{%- if DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_LMS_WORKER > 0 %}
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: lms-worker-pdb
+spec:
+  minAvailable: {{DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_LMS_WORKER}}%
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: lms-worker
+{%- endif %}
+{%- if DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CMS > 0 %}
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: cms-pdb
+spec:
+  minAvailable: {{DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CMS}}%
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: cms
+{%- endif %}
+{%- if DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CMS_WORKER > 0 %}
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: cms-worker-pdb
+spec:
+  minAvailable: {{DRYDOCK_PDB_MINAVAILABLE_PERCENTAGE_CMS_WORKER}}%
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: cms-worker
+{%- endif %}