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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 ee408e76dc441412a56e3228e7d759ba7046b45b
Author: Pearl Dsilva <pearl1...@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..d236339 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 method 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.
