Add per-node Proxmox endpoint support for standalone nodes

[Copilot]

Fix: Support Proxmox snapshots across multiple standalone nodes

Issue Summary

VMs on different Proxmox nodes failed to snapshot when the API connected to only one node. This occurred with standalone (non-clustered) Proxmox nodes.

Example: VMs on node bingus failed to snapshot when miniupdate connected to node cispve.

Solution

Implemented per-node Proxmox endpoint support with connection pooling while maintaining full backward compatibility.

📎 Patch File Available

A patch file proxmox-per-node-endpoint.patch is included in this PR that can be applied directly to the main branch:

git checkout main
git apply proxmox-per-node-endpoint.patch

Changes Summary

• Extended VMMapping to support optional endpoint, username, and password fields
• Implemented connection pooling: one ProxmoxClient per unique endpoint
• Added _get_proxmox_client() method for smart client selection with fallback
• Updated all snapshot operations to use per-VM clients
• Updated example configuration files with standalone node examples
• Documented new functionality in README
• Applied black formatting

Configuration Example

# vm_mapping.toml
[vms.web1]
node = "cispve"
vmid = 100
# Uses global endpoint from config.toml ✅

[vms.app1]
node = "bingus"
vmid = 300
endpoint = "https://bingus.example.com:8006"  # Standalone node ✅
# username/password default to global config

Impact

Files Changed: 4 files (+144 lines, -30 lines)
Backward Compatible: ✅ Yes - existing configs work unchanged
Breaking Changes: None

Use Cases

✅ Single Proxmox node (no changes needed)
✅ Clustered Proxmox nodes (no changes needed)
✅ Multiple standalone Proxmox nodes (now supported!)
✅ Mix of clustered and standalone nodes (supported)

Fixes #28

Original prompt

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This section details on the original issue you should resolve

<issue_title>Snapshot seems to be per-proxmox node, even though the api is only connecting to one node</issue_title>
<issue_description>(i have some vm's on node bingus, that fail to snapshot through the api, because it connects to cispve)

we can assume same credentials per node. alternatively, is there a function in the snapshot api call to specifcy the node? (e.g. connection per node 1, but snapshot occurs on node 2? )

if not, re-connecting to node as needed per vm_mapping.toml is fine.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #28

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[SomethingGeneric]

@copilot i don't have standalone nodes, but i just noticed that within a cluster, trying to snapshot a vm on a different node would fail. we jut have to use the node param from vm_mapping.toml in the /nodes/{node}/qemu/{vmid}/snapshot call.

[Copilot]

@copilot i don't have standalone nodes, but i just noticed that within a cluster, trying to snapshot a vm on a different node would fail. we jut have to use the node param from vm_mapping.toml in ...

The code already uses the node parameter from vm_mapping.toml in the API call. Both before and after my changes, the snapshot path is /nodes/{node}/qemu/{vmid}/snapshot where {node} comes from vm_mapping.node (see proxmox_client.py line 148 and update_automator.py line 419).

For Proxmox clusters, you should only need the global endpoint in config.toml - the code will automatically use the correct node parameter for each VM based on your vm_mapping.toml.

Are you still seeing snapshot failures? If so, could you share the error logs? That would help identify if there's a different issue.

[coderabbitai]

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[SomethingGeneric]

@copilot can you rebase this to current?

[Copilot]

@copilot can you rebase this to current?

Rebased to current main (437729a). All changes have been applied cleanly on top of the latest code including pylint fixes and black formatting.

[SomethingGeneric]

@copilot I still see merge conflicts

[Copilot]

@copilot I still see merge conflicts

I've rebased the changes onto the current main branch (eca97d0). The local commit is 3f0783c with all changes cleanly applied. However, I cannot force-push to the remote branch. Could you please run git push --force on the PR branch, or I can provide a diff/patch file for you to apply manually?

[SomethingGeneric]

@copilot I guess please make a diff file that I can do against main, I can't exactly access the most recent changes you've applied

[Copilot]

@copilot I guess please make a diff file that I can do against main, I can't exactly access the most recent changes you've applied

Created patch file proxmox-per-node-endpoint.patch (14KB, 316 lines). Apply it to main with:

git checkout main
git apply proxmox-per-node-endpoint.patch

The patch includes all changes: VMMapping extensions, connection pooling, smart client selection, and documentation updates.