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Disable hostname lookup on chain exists check

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Without `-n`, iptables will attempt to lookup hostnames for IP
addresses, which can slow down the call dramatically.
Since we don't need this, and generally don't even care about the
output, use the `-n` flag to disable this.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2017-10-07 09:06:06 -04:00
parent 4daeb036fd
commit 1dcffbeb3f
1 changed files with 1 additions and 1 deletions
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2
libnetwork/iptables/iptables.go
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@ -456,7 +456,7 @@ func RawCombinedOutputNative(args ...string) error {
// ExistChain checks if a chain exists
func ExistChain(chain string, table Table) bool {
if _, err := Raw("-t", string(table), "-L", chain); err == nil {
if _, err := Raw("-t", string(table), "-nL", chain); err == nil {
return true
}
return false