rhtyd commented on a change in pull request #3704: utils: use iproute to get
default network interface
URL: https://github.com/apache/cloudstack/pull/3704#discussion_r349767341
##########
File path: utils/src/main/java/com/cloud/utils/net/NetUtils.java
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@@ -268,19 +268,7 @@ public static String getDefaultEthDevice() {
final String defDev = Script.runSimpleBashScript("/sbin/route -n
get default 2> /dev/null | grep interface | awk '{print $2}'");
return defDev;
}
- final String defaultRoute = Script.runSimpleBashScript("/sbin/route |
grep default");
-
- if (defaultRoute == null) {
- return null;
- }
-
- final String[] defaultRouteList = defaultRoute.split("\\s+");
-
- if (defaultRouteList.length != 8) {
- return null;
- }
-
- return defaultRouteList[7];
+ return Script.runSimpleBashScript("ip route | grep default | head -1 |
grep -Po '(?<=dev )(\\S+)'");
Review comment:
If speed is a requirement, I won't bother iproute2, just use `procfs`: `awk
'$2 == 00000000 { print $1 }' /proc/net/route`
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