[cloudstack-documentation] branch 4.18 updated: Add notes on System VM live patch (#345)

[ro...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

rohit pushed a commit to branch 4.18
in repository https://gitbox.apache.org/repos/asf/cloudstack-documentation.git


The following commit(s) were added to refs/heads/4.18 by this push:
     new 07af5fe  Add notes on System VM live patch (#345)
07af5fe is described below

commit 07af5fe1bb87d14b94cdaacec78d498ba53d83af
Author: Pearl Dsilva <pe...@gmail.com>
AuthorDate: Thu Sep 14 06:30:16 2023 -0400

    Add notes on System VM live patch (#345)
    
    * Add notes on System VM live patch
    
    * Update _sysvm_restart.rst
    
    * Update _sysvm_restart.rst
    
    * Update _sysvm_restart.rst
    
    ---------
    
    Co-authored-by: Rohit Yadav <ro...@shapeblue.com>
---
 source/upgrading/upgrade/_sysvm_restart.rst | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/source/upgrading/upgrade/_sysvm_restart.rst b/source/upgrading/upgrade/_sysvm_restart.rst
index 26aef64..4c2dc8f 100644
--- a/source/upgrading/upgrade/_sysvm_restart.rst
+++ b/source/upgrading/upgrade/_sysvm_restart.rst
@@ -52,9 +52,12 @@ in the system VMs.
    With respect to VRs, a network restart without cleanup is initiated to during live patching to ensure all rules
    are re-applied. 
 
-   **NOTE:** In case there is an absolute need to upgrade the system VM template due to availability of
-   security patches or update in a package provided by the template, then the old workflow of recreating the system
-   VM will need to be followed, which would mean noticible downtime.
+   **NOTE:** In cases where upgrading the system VM template is necessary due to availability of security patches
+   or updated packages in the template, or in case live-patch fails for systemvms and virtual routers due
+   to any issues or limitations (such as VPC networks without any network tiers) then please follow the
+   traditional method of upgrading system VMs and virtual routers by restarting or recreating the system VMs
+   and virtual routers (including restarting the network with/without cleanup as required), which could mean
+   some downtime.
    
 Following matrix lists the versions of CloudStack that support live patching.