[cloudstack-documentation] branch 4.18-live-patch-limitation created (now e0248c3)

[pe...@apache.org]

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pearl11594 pushed a change to branch 4.18-live-patch-limitation
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      at e0248c3  Add notes on System VM live patch

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     new e0248c3  Add notes on System VM live patch

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[cloudstack-documentation] 01/01: Add notes on System VM live patch

[pe...@apache.org]

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pearl11594 pushed a commit to branch 4.18-live-patch-limitation
in repository https://gitbox.apache.org/repos/asf/cloudstack-documentation.git

commit e0248c34997a01a51270bae473253ac22cc753ab
Author: Pearl Dsilva <pe...@gmail.com>
AuthorDate: Wed Sep 13 08:15:24 2023 -0400

    Add notes on System VM live patch
---
 source/upgrading/upgrade/_sysvm_restart.rst | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/source/upgrading/upgrade/_sysvm_restart.rst b/source/upgrading/upgrade/_sysvm_restart.rst
index 26aef64..46d1976 100644
--- a/source/upgrading/upgrade/_sysvm_restart.rst
+++ b/source/upgrading/upgrade/_sysvm_restart.rst
@@ -52,9 +52,18 @@ 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:** 
+
+   1. In case there is an absolute need to upgrade the system VM template due to availability of security patches, 
+   update in a package provided by the template, or in case live-patch doesn't seem to work for any reason
+   then please follow the legacy methof of upgrading system VMs and virtual routers by recreating the system
+   VM, which would mean noticible downtime.
+
+
+   2. There is a known limitation in the System VM / VR live patch feature. If a VPC network either doesn't have any network tiers
+   or has no network tier in the __Implemented__ state, then live patching is skipped on the associated VPC VR(s). Use the traditional workflow
+   of upgrading the system VMs and virtual routers - by either restarting the corresponding network with cleanup, or restarting the system VMs.
+   
    
 Following matrix lists the versions of CloudStack that support live patching.