fix(hatchery/swarm): don't rm too young networks (#3164)

engine/hatchery/swarm/swarm_util_kill.go

@@ -3,6 +3,7 @@ package swarm
 import (
 	"strconv"
 	"strings"
+	"time"
 
 	types "github.com/docker/docker/api/types"
 	context "golang.org/x/net/context"
@@ -126,6 +127,11 @@ func (h *HatcherySwarm) killAwolNetworks() error {
 				continue
 			}
 
+			// if network created less than 10 min, keep it alive for now
+			if time.Since(nets[i].Created) < 10*time.Minute {
+				continue
+			}
+
 			log.Debug("hatchery> swarm> killAwolNetworks> Delete network %s from %s", n.Name, dockerClient.name)
 			if err := dockerClient.NetworkRemove(context.Background(), n.ID); err != nil {
 				log.Warning("hatchery> swarm> killAwolNetworks> Unable to delete network %s err:%s", n.Name, err)