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Prefix network namespaces with wrenn-, add stale cleanup, lower diff cap

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Rename ns-{idx} to wrenn-ns-{idx} and veth-{idx} to wrenn-veth-{idx}
to avoid collisions with other tools. Add CleanupStaleNamespaces() at
agent startup to remove orphaned namespaces, veths, iptables rules, and
routes from a previous crash. Lower maxDiffGenerations from 10 to 8 to
prevent Go runtime memory corruption from snapshot/restore drift.
This commit is contained in:
Rafeed M. Bhuiyan
2026-03-29 02:14:30 +06:00
parent 46d60fc5a5
commit 1ca10230a9
3 changed files with 89 additions and 5 deletions
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8
internal/sandbox/manager.go
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@ -73,8 +73,12 @@ type snapshotParent struct {
}
// maxDiffGenerations caps how many incremental diff generations we chain
// before falling back to a Full snapshot to collapse the chain.
const maxDiffGenerations = 10
// before falling back to a Full snapshot to collapse the chain. Firecracker
// snapshot/restore of a Go process (envd) accumulates runtime memory state
// drift; empirically, ~10 diff-based cycles corrupt the Go page allocator.
// A Full snapshot resets the generation counter and produces a clean base,
// preventing the crash.
const maxDiffGenerations = 8
// New creates a new sandbox manager.
func New(cfg Config) *Manager {