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Log error on SO_REUSEPORT and continue (#2243)

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The underlying system might not support
SO_REUSEPORT, even though it is available in
kernel 3.9+. If there's an error, continue.

Signed-off-by: stuart nelson <stuartnelson3@gmail.com>
This commit is contained in:
stuart nelson 2018-10-28 17:02:58 +01:00 • committed by Miek Gieben
parent 7b25d18019
commit dc85f14e5c
1 changed files with 7 additions and 9 deletions
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16
core/dnsserver/listen_go111.go
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@ -8,19 +8,17 @@ import (
"net" "net"
"syscall" "syscall"
"github.com/coredns/coredns/plugin/pkg/log"
"golang.org/x/sys/unix" "golang.org/x/sys/unix"
) )
const supportsReusePort = true func reuseportControl(network, address string, c syscall.RawConn) error {
c.Control(func(fd uintptr) {
func reuseportControl(network, address string, c syscall.RawConn) (opErr error) { if err := unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
err := c.Control(func(fd uintptr) { log.Warningf("Failed to set SO_REUSEPORT on socket: %s", err)
opErr = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1) }
}) })
if err != nil { return nil
return err
}
return opErr
} }
func listen(network, addr string) (net.Listener, error) { func listen(network, addr string) (net.Listener, error) {