Hector-Work opened a new issue, #8810:
URL: https://github.com/apache/cloudstack/issues/8810
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##### ISSUE TYPE
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* Other
##### COMPONENT NAME
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Categorize the issue, e.g. API, VR, VPN, UI, etc.
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Networking
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##### CLOUDSTACK VERSION
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branch.
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4.19.0.0
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##### CONFIGURATION
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Information about the configuration if relevant, e.g. basic network,
advanced networking, etc. N/A otherwise
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Zone created with advanced networking, 1 physical network.
##### OS / ENVIRONMENT
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Information about the environment if relevant, N/A otherwise
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Ubuntu 22.04, KVM
##### SUMMARY
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I've had a CloudStack installation working well on a single host for a
couple of weeks now. Yesterday I added another host to the cluster. When I went
back to look at the instances all of them had stopped. Attempting to start them
again resulted in an error. The same happened with the VRs, though the system
VMs are fine.
This is the error in the management server logs whenever I try to start an
instance:
```
2024-03-20 11:41:20,508 INFO [c.c.v.VirtualMachineManagerImpl]
(Work-Job-Executor-36:ctx-7b172848 job-868/job-869 ctx-6d899296)
(logid:698ffc95) Unable to start VM on Host
{"id":1,"name":"comp1","type":"Routing","uuid":"2fca77e2-a9d5-4ca3-977f-9fc18e78bd0a"}
due to Failed to create vnet 11: Cannot find device
"br-11"/usr/share/cloudstack-common/scripts/vm/network/vnet/modifyvlan.sh: line
37: /proc/sys/net/ipv6/conf/br-11.11/disable_ipv6: No such file or
directoryCannot find device "br-11.11"Failed to create vlan 11 on pif: br-11.
```
Any help to understand what's going wrong would be much appreciated.
##### STEPS TO REPRODUCE
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##### EXPECTED RESULTS
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New host is added, and instances continue running.
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##### ACTUAL RESULTS
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Error when attempting to start instances.
~~~
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