Open-source the OpenStack DB migration scripts and workshop

migration-scripts/scripts/remove_deleted_instances.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+# Copyright 2018, Oath Inc.
+# Licensed under the terms of the MIT license. See LICENSE file for terms.
+"""
+Usage:
+./remove_deleted_instances.py <db_host> <db_user> <db_pass>
+"""
+
+import mysql.connector
+import sys
+
+def tuple_to_dict(cur, tup):
+    return dict(zip(cur.column_names, tup))
+
+uuids = []
+
+cnx = mysql.connector.connect(host=sys.argv[1], user=sys.argv[2],  passwd=sys.argv[3], db="nova")
+cur1 = cnx.cursor()
+cur = cnx.cursor()
+cur.execute("SELECT * FROM  `instances` WHERE  `deleted_at` IS NOT NULL")
+for row in cur.fetchall():
+    row = tuple_to_dict(cur, row)
+    uuids.append(row['uuid']);
+
+if len(uuids) <= 1:
+    sys.exit(0)
+
+cur1.execute("SET FOREIGN_KEY_CHECKS = 0;")
+
+uuids = tuple(str(u) for u in uuids)
+cur.execute("DELETE FROM instance_id_mappings where uuid IN {}".format(uuids))
+cur.execute("DELETE FROM instance_info_caches where instance_uuid IN {}".format(uuids))
+cur.execute("DELETE FROM instance_system_metadata where instance_uuid IN {}".format(uuids))
+cur.execute("DELETE FROM security_group_instance_association where instance_uuid IN {}".format(uuids))
+cur.execute("DELETE FROM instances where uuid IN {}".format(uuids))
+cnx.commit()
+
+cur1.execute("SET FOREIGN_KEY_CHECKS = 1;")
+cnx.close()