rohityadavcloud opened a new issue, #7547:
URL: https://github.com/apache/cloudstack/issues/7547
CloudStack agent trims the output for Host.OS from the `version.sh` (see
below). In case of RHEL KVM hosts, CloudStack thinks they are "Red" OS and not
"Red Hat Enterprise Linux", and doesn't allow the host to be added to an
existing cluster.
```
# /usr/share/cloudstack-common/scripts/vm/hypervisor/versions.sh
Host.OS=Red Hat Enterprise Linux
Host.OS.Version=9.2
Host.OS.Kernel.Version=5.14.0-284.11.1.el9_2.x86_64
```
This causes NPE at:
```
2023-05-23 13:29:42,728 DEBUG [c.c.a.m.AgentManagerImpl]
(AgentConnectTaskPool-348:ctx-f5b5e351) (logid:36272aee) Failed to handle host
connection:
java.lang.NullPointerException
at
com.cloud.hypervisor.kvm.discoverer.LibvirtServerDiscoverer.createHostVOForConnectedAgent(LibvirtServerDiscoverer.java:473)
at
com.cloud.resource.ResourceManagerImpl.dispatchToStateAdapters(ResourceManagerImpl.java:1997)
```
And the Host.OS in the cluster's first host's DB detail doesn't match that
of the host being added:
https://github.com/apache/cloudstack/blob/4.18/server/src/main/java/com/cloud/hypervisor/kvm/discoverer/LibvirtServerDiscoverer.java#L471
Without DEBUG logs enabled in cloudstack-agent it may read as if libvirt is
having issues.
##### ISSUE TYPE
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* Bug Report
##### COMPONENT NAME
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Categorize the issue, e.g. API, VR, VPN, UI, etc.
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~~~
RHEL9 + ACS 4.18+
~~~
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