mysql-quirk

Co-authored-by: Rohit Yadav <[email protected]>

source/upgrading/index.rst

@@ -31,12 +31,13 @@ release.  Please read through all sections carefully before starting.
 .. note::
    For information on the API changes and issues fixed in this release, please see the Release Notes section of the documentation
 
-
 Contents:
 
 .. toctree::
    :maxdepth: 1
 
+   upgrade/mysql
+   upgrade/valid_source
    upgrade/upgrade-4.15
    upgrade/upgrade-4.14
    upgrade/upgrade-4.13
@@ -55,4 +56,3 @@ Contents:
 ..   upgrade/upgrade-4.0
 ..   upgrade/upgrade-3.0.x
 ..   upgrade/upgrade-2.2.14
-   upgrade/valid_source

source/upgrading/upgrade/mysql.rst

@@ -0,0 +1,36 @@
+.. Licensed to the Apache Software Foundation (ASF) under one
+   or more contributor license agreements.  See the NOTICE file
+   distributed with this work for additional information#
+   regarding copyright ownership.  The ASF licenses this file
+   to you under the Apache License, Version 2.0 (the
+   "License"); you may not use this file except in compliance
+   with the License.  You may obtain a copy of the License at
+   http://www.apache.org/licenses/LICENSE-2.0
+   Unless required by applicable law or agreed to in writing,
+   software distributed under the License is distributed on an
+   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+   KIND, either express or implied.  See the License for the
+   specific language governing permissions and limitations
+   under the License.
+
+MySQL upgrade problems
+======================
+
+Users who may upgrade their MySQL server after upgrading to Apache
+CloudStack 4.15 or later, may need to run the following SQL query to
+fix an issue with "cloud.nics" table's column type which may lead to
+exception seen in the management server logs. Users who have already
+upgraded their MySQL server prior to upgrading to Apache CloudStack
+4.15 may not need this as this query runs as part of the 4.14.x to
+4.15.0.0 database upgrade path.
+
+.. note::
+   The issue has not been seen in cases where the database was upgraded while on CloudStack version 4.14.
+
+   .. parsed-literal::
+ALTER TABLE nics MODIFY COLUMN update_time timestamp DEFAULT CURRENT_TIMESTAMP;
+
+The issue is known to affect the following MySQL server versions:
+
+ -  5.7.34 or later
+ -  8+