fix(memberlist): Respect interface names config for advertise address

If interface names are specified in common config, use this to
fulfill the instance_addr with it.

Signed-off-by: Seena Fallah <[email protected]>

pkg/loki/modules.go

@@ -22,6 +22,7 @@ import (
 	"github.com/grafana/dskit/kv/codec"
 	"github.com/grafana/dskit/kv/memberlist"
 	"github.com/grafana/dskit/middleware"
+	"github.com/grafana/dskit/netutil"
 	"github.com/grafana/dskit/ring"
 	"github.com/grafana/dskit/runtimeconfig"
 	"github.com/grafana/dskit/server"
@@ -1449,6 +1450,15 @@ func (t *Loki) initMemberlistKV() (services.Service, error) {
 	)
 	dnsProvider := dns.NewProvider(util_log.Logger, dnsProviderReg, dns.GolangResolverType)
 
+	var err error
+	t.Cfg.MemberlistKV.AdvertiseAddr, err = GetInstanceAddr(
+		t.Cfg.MemberlistKV.AdvertiseAddr,
+		t.Cfg.Common.InstanceInterfaceNames,
+		util_log.Logger,
+	)
+	if err != nil {
+		return nil, err
+	}
 	t.MemberlistKV = memberlist.NewKVInitService(&t.Cfg.MemberlistKV, util_log.Logger, dnsProvider, reg)
 
 	t.Cfg.CompactorConfig.CompactorRing.KVStore.MemberlistKV = t.MemberlistKV.GetMemberlistKV
@@ -2042,3 +2052,11 @@ func schemaHasBoltDBShipperConfig(scfg config.SchemaConfig) bool {
 
 	return false
 }
+
+func GetInstanceAddr(addr string, netInterfaces []string, logger log.Logger) (string, error) {
+	if addr != "" {
+		return addr, nil
+	}
+
+	return netutil.GetFirstAddressOf(netInterfaces, logger, false)
+}