/// <summary>
/// Checks the application gateway back end health metrics and deletes App Payload Failed nodes
/// </summary>
/// <returns><c>true</c>, if we deleted nodes, <c>false</c> otherwise.</returns>
/// <param name="appGw">App gateway</param>
/// <param name="scaleSet">Scale set.</param>
/// <param name="minHealthyServers">Minimum healthy servers.</param>
/// <param name="log">Log.</param>
public static bool CheckApplicationGatewayBEHealthAndDeleteBadNodes(ApplicationGatewayBackendHealthInner appGw, IVirtualMachineScaleSet scaleSet, int minHealthyServers, ILogger log)
{
try
{
log.LogInformation("Enumerating Application Gateway Backend Servers");
var healthy = new List <ApplicationGatewayBackendHealthServer>();
var unhealthy = new List <ApplicationGatewayBackendHealthServer>();
foreach (var server in appGw.BackendAddressPools[0].BackendHttpSettingsCollection[0].Servers)
{
if (server.Health.Value == "Healthy")
{
healthy.Add(server);
}
else
{
unhealthy.Add(server);
}
}
List <string> appGwBadIps = new List <string>();
// If we have unhealthy nodes, then delete them
if (unhealthy.Count > 0)
{
log.LogInformation("App Payload Failed node count = {0}, removing nodes", unhealthy.Count);
if (healthy.Count <= 3)
{
var nodeCount = healthy.Count() + unhealthy.Count() + 3;
log.LogInformation("Healthy Node Count <=3, mandatory scale event to Current Healthly Count + UnHealthy Count + 3 nodes. ScaleTarget Set to {0}", nodeCount);
vmScaleSetOperations.ScaleToTargetSize(scaleSet, nodeCount, 10, 100, false, false, log);
}
return(vmScaleSetOperations.RemoveVMSSInstancesByIP(scaleSet, unhealthy.Select(s => s.Address).ToList(), log));
}
return(false);
}
catch (Exception e)
{
log.LogInformation("Error Message: " + e.Message);
log.LogInformation("HResult: " + e.HResult);
log.LogInformation("InnerException:" + e.InnerException);
return(false);
}
}
/// <summary>
/// Gets the healthy and unhealthy node counts.
/// </summary>
/// <returns>The healthy and unhealthy node counts.</returns>
/// <param name="appGw">App gw.</param>
/// <param name="log">Log.</param>
public static Tuple <int, int> GetHealthyAndUnhealthyNodeCounts(ApplicationGatewayBackendHealthInner appGw, ILogger log)
{
var healthy = 0;
var unhealthy = 0;
foreach (var h in appGw.BackendAddressPools[0].BackendHttpSettingsCollection[0].Servers.Select(s => s.Health.Value))
{
switch (h.ToLower())
{
case "healthy":
healthy++;
break;
default:
unhealthy++;
break;
}
}
return(new Tuple <int, int>(healthy, unhealthy));
}
/// <summary>
/// Checks the application gateway back end health metrics and deletes App Payload Failed nodes
/// </summary>
/// <returns><c>true</c>, if we deleted nodes, <c>false</c> otherwise.</returns>
/// <param name="appGw">App gateway</param>
/// <param name="scaleSet">Scale set.</param>
/// <param name="minHealthyServers">Minimum healthy servers.</param>
/// <param name="log">Log.</param>
public static bool CheckApplicationGatewayBEHealthAndReimageBadNodes(ApplicationGatewayBackendHealthInner appGw, IVirtualMachineScaleSet scaleSet, IVirtualMachineScaleSets allScaleSets, int minHealthyServers, ILogger log)
{
try
{
log.LogInformation("Enumerating Application Gateway Backend Servers");
var healthy = new List <ApplicationGatewayBackendHealthServer>();
var unhealthy = new List <ApplicationGatewayBackendHealthServer>();
foreach (var server in appGw.BackendAddressPools[0].BackendHttpSettingsCollection[0].Servers)
{
if (server.Health.Value == "Healthy")
{
healthy.Add(server);
}
else
{
unhealthy.Add(server);
}
}
List <string> appGwBadIps = new List <string>();
// If we have unhealthy nodes, then delete them
if (unhealthy.Count > 0)
{
log.LogInformation("App Payload Failed node count = {0}, reimaging nodes", unhealthy.Count);
return(VmScaleSetOperations.ReplaceVMSSInstancesByIP(scaleSet, allScaleSets, unhealthy.Select(s => s.Address).ToList(), log));
}
return(false);
}
catch (Exception e)
{
log.LogInformation("Error Message: " + e.Message);
log.LogInformation("HResult: " + e.HResult);
log.LogInformation("InnerException:" + e.InnerException);
return(false);
}
}
