Add host-local IPAM GC on startup #5660
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/test-all |
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| return fmt.Errorf("path '%s' is not a directory: %w", dir, err) | ||
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| lk, err := NewFileLock(dataDir) |
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It seems https://github.com/containernetworking/plugins/blob/93a1b3d0e71b3a4b5c463de357876fe8d383012f/plugins/ipam/host-local/backend/disk/backend.go#L53 uses dir instead of its parent dir dataDir?
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That's a pretty bad typo, fixed
| return fmt.Errorf("error when gathering IP filenames in the host-local data directory: %w", err) | ||
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| allocatedIPs := sets.New[string]() |
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nit: it seems enough to use a bool to track if it ever fails to release an IP.
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| // This code was copied from https://github.com/containernetworking/plugins/blob/v1.3.0/plugins/ipam/host-local/backend/disk/lock.go |
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could we import github.com/containernetworking/plugins/plugins/ipam/host-local/backend given the package is already a dependency?
Line 22 in 4a52bca
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Yes, we actually use it pretty extensively. Changed to an import.
During CNIServer reconciliation, we perform host-local IPAM garbage collection (GC) by comparing the set of IPs allocated to local Pods and the set of IPs currently reserved by the plugin. We release any IP reserved by the plugin that is not in-use by a local Pod. The purpose is to avoid leaking IP addresses when there is a bug in the container runtime, which has happened in the past. Two key design choices that were made: * We do not invoke CNI DEL to release IPs, instead we access the host-local data which is persisted on the Node, and modify it as needed. * We do not rely on the interface store (as persisted to OVSDB) to determine the set of IPs that may have been leaked. In case of an Antrea bug, it could be possible (although unlikely) for an IP to still be allocated by host-local but be missing from the interface store. Intead, we list all allocated IPs from the host-local data (an allocated IP corresponds to one disk file). This approach is essentially the same as our existing script: https://github.com/antrea-io/antrea/blob/main/hack/gc-host-local.sh Fixes antrea-io#4326 Signed-off-by: Antonin Bas <abas@vmware.com>
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Signed-off-by: Antonin Bas <abas@vmware.com>
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During CNIServer reconciliation, we perform host-local IPAM garbage collection (GC) by comparing the set of IPs allocated to local Pods and the set of IPs currently reserved by the plugin. We release any IP reserved by the plugin that is not in-use by a local Pod. The purpose is to avoid leaking IP addresses when there is a bug in the container runtime, which has happened in the past.
Two key design choices that were made:
This approach is essentially the same as our existing script: https://github.com/antrea-io/antrea/blob/main/hack/gc-host-local.sh
Fixes #4326