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fix: ensure minimum ulimits #10

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Merged
gilescope merged 2 commits into from
Feb 19, 2026
Merged

fix: ensure minimum ulimits #10

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3755976
fix: ensure minimum ulimits
gilescope Feb 19, 2026
a2dd46d
fix: ensure minimum ulimits
gilescope Feb 19, 2026
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14 changes: 14 additions & 0 deletions cmd/buildkitd/main_unix.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ package main

import (
"crypto/tls"
"fmt"
"net"
"os"
"syscall"
Expand All @@ -16,6 +17,19 @@ import (

func init() {
syscall.Umask(0)

// Docker 29+ (containerd v2) lowered the default open file limit from
// 1048576 to 1024, which starves buildkitd. Raise it back.
var lim syscall.Rlimit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim); err == nil && lim.Cur < 1048576 {
lim.Cur = 1048576
if lim.Max < 1048576 {
lim.Max = 1048576
}
if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &lim); err != nil {
fmt.Fprintf(os.Stderr, "warning: failed to raise RLIMIT_NOFILE: %v\n", err)
}
}
}

func listenFD(addr string, tlsConfig *tls.Config) (net.Listener, error) {
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