Support for custom SSH port for KVM hosts using the configuration #12571

sureshanaparti · 2026-02-03T09:53:37Z

Description

This PR support custom SSH port for KVM hosts using the configuration 'kvm.host.discovery.ssh.port', during

KVM host discovery to connect to the Host during Add Host command
Any other operations on host using SSH

Types of changes

Breaking change (fix or feature that would cause existing functionality to change)
New feature (non-breaking change which adds functionality)
Bug fix (non-breaking change which fixes an issue)
Enhancement (improves an existing feature and functionality)
Cleanup (Code refactoring and cleanup, that may add test cases)
Build/CI
Test (unit or integration test code)

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…m.host.discovery.ssh.port' - Use the custom SSH port for KVM host discovery to connect to the Host during Add Host command - and any other operations on host using SSH

sureshanaparti · 2026-02-03T09:55:16Z

@blueorangutan package

blueorangutan · 2026-02-03T09:58:04Z

@sureshanaparti a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

codecov · 2026-02-03T10:01:43Z

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.26%. Comparing base (ce42ce5) to head (2e49b0c).
⚠️ Report is 1 commits behind head on 4.20.

Files with missing lines	Patch %	Lines
...che/cloudstack/backup/NetworkerBackupProvider.java	0.00%	2 Missing ⚠️
...rvisor/kvm/discoverer/LibvirtServerDiscoverer.java	0.00%	1 Missing ⚠️
...rc/main/java/com/cloud/utils/ssh/SSHCmdHelper.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               4.20   #12571   +/-   ##
=========================================
  Coverage     16.26%   16.26%           
  Complexity    13428    13428           
=========================================
  Files          5660     5660           
  Lines        499959   499964    +5     
  Branches      60707    60708    +1     
=========================================
+ Hits          81326    81331    +5     
+ Misses       409560   409559    -1     
- Partials       9073     9074    +1

Flag	Coverage Δ
uitests	`4.16% <ø> (ø)`
unittests	`17.12% <33.33%> (+<0.01%)`	⬆️

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blueorangutan · 2026-02-03T10:58:57Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 16684

sureshanaparti · 2026-02-03T11:55:27Z

@blueorangutan test

blueorangutan · 2026-02-03T11:56:05Z

@sureshanaparti a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

winterhazel · 2026-02-03T12:11:56Z

engine/components-api/src/main/java/com/cloud/agent/AgentManager.java

            "This timeout overrides the wait global config. This holds a comma separated key value pairs containing timeout (in seconds) for specific commands. " +
                    "For example: DhcpEntryCommand=600, SavePasswordCommand=300, VmDataCommand=300", false);

+    ConfigKey<Integer> KVMHostDiscoverySshPort = new ConfigKey<>(ConfigKey.CATEGORY_ADVANCED, Integer.class,


Wouldn't it be better to have this as a parameter on host addition/edit to allow configuring it on a host-level?

I think we can, but do we really want to allow to use a different ssh port for all hosts within a cluster? seems a bit overkill.

I don't see a problem allowing it. Maybe a single host needs to use a different port for SSH connection.

ok, a bit of an edge case, only applicable to smaller installations I’d guess (in my ignorance). You are not asking to remove a higher level setting are you? just to add a per host parameter..

the config is applicable for the kvm hosts on the entire cloudstack installation, mainly for large deployments where the custom port is used for all the hosts. it doesn't provide flexibility to set few hosts on one port, and few hosts on the other. it's always better to have all these hosts accessible on the same port. a new host parameter (that can be updated through add or update host call) can provide flexibility, but it's mostly NULL/empty (when not defined or default port is used) and is not applicable for VMware hosts.

@sureshanaparti
one option would be allowing host:port when adding a host
it is compatible with current format: host. no UI changes, no global settings

similar to the ceph monitors which supports mon1,mon2,mon3:6789 as the monitor
refer to #6792

so reading back this threat; are we not merging this and going for a different solution, @winterhazel @weizhouapache ? cc @sureshanaparti

no threat @DaanHoogland 😄

I think it would be better to work on a different solution

@DaanHoogland @weizhouapache I prefer the host-level configuration too

Hi guys, sorry but I don't see what the issue is defining this setting at cluster level, I think trying to scope the setting/detail to host level may not be necessary. Currently the host discovery port is hardcoded to be port 22 globally. This PR will give operators flexibility to set a custom port (in case its needed) for hosts to be added on a cluster (if we scope it to cluster). What do you think? @winterhazel @weizhouapache @sureshanaparti @DaanHoogland

blueorangutan · 2026-02-04T05:05:47Z

[SF] Trillian test result (tid-15362)
Environment: kvm-ol8 (x2), zone: Advanced Networking with Mgmt server ol8
Total time taken: 58847 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr12571-t15362-kvm-ol8.zip
Smoke tests completed. 141 look OK, 0 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File

engine/components-api/src/main/java/com/cloud/agent/AgentManager.java

…er.java

DaanHoogland

clgtm

Support for custom SSH port for KVM hosts using the configuration 'kv…

9692e29

…m.host.discovery.ssh.port' - Use the custom SSH port for KVM host discovery to connect to the Host during Add Host command - and any other operations on host using SSH

boring-cyborg bot added component:agent component:backup component:kvm component:orchestration labels Feb 3, 2026

sureshanaparti added this to the 4.20.3 milestone Feb 3, 2026

sureshanaparti requested review from DaanHoogland and nvazquez February 3, 2026 09:54

sureshanaparti requested a review from abh1sar February 3, 2026 09:59

sureshanaparti added the status:needs-testing label Feb 3, 2026

RosiKyu self-assigned this Feb 3, 2026

winterhazel reviewed Feb 3, 2026

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sureshanaparti commented Feb 4, 2026

View reviewed changes

engine/components-api/src/main/java/com/cloud/agent/AgentManager.java Outdated Show resolved Hide resolved

Update engine/components-api/src/main/java/com/cloud/agent/AgentManag…

2e49b0c

…er.java

DaanHoogland approved these changes Feb 4, 2026

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Support for custom SSH port for KVM hosts using the configuration #12571

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Support for custom SSH port for KVM hosts using the configuration #12571

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sureshanaparti commented Feb 3, 2026

Description

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