Submitting this for community use. It's a TrafficScript - pretty ugly and in a very early stage but it does what I need it to do and others might find it useful Big thanks to Riverbed Support for helping me get the REST API enabled as I spent ages trying to figure out why that wasn't working only to discover it was a menu option (doh!). The requirement was pretty specific, we're dealing with an application which can handle a failover to a secondary node, but can't handle failing back. So we're not using the Stingray as a load balancer in this case, more as a clever failover utility. The client didn't want the Stingray failing back to the primary node/pool once it was fixed and the Stingray doesn't support no-failback as a default option so we had to revert to a TrafficScript to do what we wanted. Hopefully the code is pretty clear, but if there are any questions or indeed suggestions on how to improve it further let me know! ################################################################################ # Script Name: killSwitch # Author: Johnathan Williamson # Version: 0.1 Alpha # Disclaimer: Not recommended for production use, YMMV ! # Description This rule disables the primary pools node on initial failure. # # The rule runs on every page load. # # It uses the subroutines in the stmrestclient rule ################################################################################ import stmrestclient; ## First we pull the current state of each pool. This helps us determine what to do next. $ActivePool = pool.checknode("ActivePool","192.168.60.11",80); $SecondaryPool = pool.checknode("SecondaryPool","192.168.60.12",80); $accept = "application/json"; $resource = "pools/ActivePool"; # If a pool is dead, it indicates all nodes inside it have stopped responding if ($ActivePool == "DEAD") { # Get current pool config and set node to disabled $response = stmrestclient.stmRestGet($resource, $accept); if ($response["rc"] == 1) { $poolConfig = $response["data"]; $poolConfig["properties"]["basic"]["disabled"] = ["192.168.60.11:80"]; # The following line results in a few moans in the logs about missing node config, but also means no double node entries in the GUI #$poolConfig["properties"]["basic"]["nodes"] = []; } # Now we've got our disabled node in the poolConfig ... submit it for action $response = stmrestclient.stmRestPut($resource, $accept, $poolConfig); if ($response["rc"] == 0) { log.warn ("CUSTOM TRAFFIC SCRIPT FAILURE - : " . lang.dump($poolConfig)); } } else if ( $ActivePool == "DISABLED" ) { # Secondary failover kicks in automatically } ## Some debug stuff #log.warn("Primary pool is " . $ActivePool); #log.warn("Secondary pool is " . $SecondaryPool$); #log.info ("disabled nodes are " . lang.dump($poolConfig["properties"]["basic"]["disabled"])); #log.info ("active nodes are " . lang.dump($poolConfig["properties"]["basic"]["nodes"])); #log.info ("full hash looks like: " . lang.dump($poolConfig));
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