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Backport of Use strict DNS for mesh gateways with hostnames into release/1.16.x #19395

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merged 1 commit into from
Oct 27, 2023
Merged

Backport of Use strict DNS for mesh gateways with hostnames into release/1.16.x #19395

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3 changes: 3 additions & 0 deletions .changelog/19268.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
```release-note:bug
Mesh Gateways: Fix a bug where replicated and peered mesh gateways with hostname-based WAN addresses fail to initialize.
```
13 changes: 8 additions & 5 deletions agent/xds/clusters.go
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Original file line number Diff line number Diff line change
Expand Up @@ -638,10 +638,13 @@ func (s *ResourceGenerator) makePeerServerClusters(cfgSnap *proxycfg.ConfigSnaps

var cluster *envoy_cluster_v3.Cluster
if servers.UseCDS {
// we use strict DNS here since multiple gateways with hostnames
// would result in an invalid cluster due to logical DNS requiring
// only a single host
cluster = s.makeExternalHostnameCluster(cfgSnap, clusterOpts{
name: name,
addresses: servers.Addresses,
})
}, envoy_cluster_v3.Cluster_STRICT_DNS)
} else {
cluster = s.makeGatewayCluster(cfgSnap, clusterOpts{
name: name,
Expand Down Expand Up @@ -860,7 +863,7 @@ func (s *ResourceGenerator) makeDestinationClusters(cfgSnap *proxycfg.ConfigSnap
if structs.IsIP(address) {
cluster = s.makeExternalIPCluster(cfgSnap, opts)
} else {
cluster = s.makeExternalHostnameCluster(cfgSnap, opts)
cluster = s.makeExternalHostnameCluster(cfgSnap, opts, envoy_cluster_v3.Cluster_LOGICAL_DNS)
}
if err := s.injectGatewayDestinationAddons(cfgSnap, cluster, svcName); err != nil {
return nil, err
Expand Down Expand Up @@ -1885,8 +1888,8 @@ func (s *ResourceGenerator) makeExternalIPCluster(snap *proxycfg.ConfigSnapshot,
}

// makeExternalHostnameCluster creates an Envoy cluster for hostname endpoints that will be resolved with DNS
// This is used by both terminating gateways for Destinations, and Mesh Gateways for peering control plane traffice
func (s *ResourceGenerator) makeExternalHostnameCluster(snap *proxycfg.ConfigSnapshot, opts clusterOpts) *envoy_cluster_v3.Cluster {
// This is used by both terminating gateways for Destinations, and Mesh Gateways for peering control plane traffic
func (s *ResourceGenerator) makeExternalHostnameCluster(snap *proxycfg.ConfigSnapshot, opts clusterOpts, discoveryType envoy_cluster_v3.Cluster_DiscoveryType) *envoy_cluster_v3.Cluster {
cfg, err := ParseGatewayConfig(snap.Proxy.Config)
if err != nil {
// Don't hard fail on a config typo, just warn. The parse func returns
Expand All @@ -1901,7 +1904,7 @@ func (s *ResourceGenerator) makeExternalHostnameCluster(snap *proxycfg.ConfigSna

// Having an empty config enables outlier detection with default config.
OutlierDetection: &envoy_cluster_v3.OutlierDetection{},
ClusterDiscoveryType: &envoy_cluster_v3.Cluster_Type{Type: envoy_cluster_v3.Cluster_LOGICAL_DNS},
ClusterDiscoveryType: &envoy_cluster_v3.Cluster_Type{Type: discoveryType},
DnsLookupFamily: envoy_cluster_v3.Cluster_V4_ONLY,
}

Expand Down
2 changes: 1 addition & 1 deletion ...t/xds/testdata/clusters/mesh-gateway-with-peer-through-mesh-gateway-enabled.latest.golden
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Expand Up @@ -30,7 +30,7 @@
{
"@type": "type.googleapis.com/envoy.config.cluster.v3.Cluster",
"name": "server.dc3.peering.f622dc37-7238-4485-ab58-0f53864a9ae5",
"type": "LOGICAL_DNS",
"type": "STRICT_DNS",
"connectTimeout": "5s",
"loadAssignment": {
"clusterName": "server.dc3.peering.f622dc37-7238-4485-ab58-0f53864a9ae5",
Expand Down