feat(charts): add backup to preStop hook

Author: Matthew Fisher

charts/database/templates/database-deployment.yaml

@@ -45,6 +45,13 @@ spec:
             exec:
               command:
                 - is_running
+          lifecycle:
+            preStop:
+              exec:
+                commmand:
+                  - gosu
+                  - postgres
+                  - do_backup
             initialDelaySeconds: 30
             timeoutSeconds: 1
           volumeMounts:

rootfs/bin/backup

@@ -1,18 +1,8 @@
 #!/usr/bin/env bash
 
 export BACKUP_FREQUENCY=${BACKUP_FREQUENCY:-4h}
-export BACKUPS_TO_RETAIN=${BACKUPS_TO_RETAIN:-5}
 
 while true; do
     sleep "$BACKUP_FREQUENCY"
-    echo "Performing a base backup..."
-    if [[ -f "$PGDATA/recovery.conf" ]] ; then
-        echo "Database is currently recovering from a backup. Will try again next loop..."
-    else
-        # perform a backup
-        envdir "$WALE_ENVDIR" wal-e backup-push "$PGDATA"
-        # only retain the latest BACKUPS_TO_RETAIN backups
-        envdir "$WALE_ENVDIR" wal-e delete --confirm retain "$BACKUPS_TO_RETAIN"
-        echo "Backup has been completed."
-    fi
+    do_backup
 done

rootfs/bin/do_backup

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+export BACKUPS_TO_RETAIN=${BACKUPS_TO_RETAIN:-5}
+
+echo "Performing a base backup..."
+if [[ -f "$PGDATA/recovery.conf" ]] ; then
+    echo "Database is currently recovering from a backup. Aborting"
+else
+    # perform a backup
+    envdir "$WALE_ENVDIR" wal-e backup-push "$PGDATA"
+    # only retain the latest BACKUPS_TO_RETAIN backups
+    envdir "$WALE_ENVDIR" wal-e delete --confirm retain "$BACKUPS_TO_RETAIN"
+    echo "Backup has been completed."
+fi