agent: Adding SyslogFacility configuration

command/agent/config.go

@@ -167,6 +167,10 @@ type Config struct {
 	// on linux and OSX. Other platforms will generate an error.
 	EnableSyslog bool `mapstructure:"enable_syslog"`
 
+	// SyslogFacility is used to control where the syslog messages go
+	// By default, goes to LOCAL0
+	SyslogFacility string `mapstructure:"syslog_facility"`
+
 	// RejoinAfterLeave controls our interaction with the cluster after leave.
 	// When set to false (default), a leave causes Consul to not rejoin
 	// the cluster until an explicit join is received. If this is set to
@@ -228,6 +232,7 @@ func DefaultConfig() *Config {
 		DNSConfig: DNSConfig{
 			MaxStale: 5 * time.Second,
 		},
+		SyslogFacility:      "LOCAL0",
 		Protocol:            consul.ProtocolVersionMax,
 		CheckUpdateInterval: 5 * time.Minute,
 		AEInterval:          time.Minute,
@@ -556,6 +561,9 @@ func MergeConfig(a, b *Config) *Config {
 	if b.CheckUpdateIntervalRaw != "" || b.CheckUpdateInterval != 0 {
 		result.CheckUpdateInterval = b.CheckUpdateInterval
 	}
+	if b.SyslogFacility != "" {
+		result.SyslogFacility = b.SyslogFacility
+	}
 
 	// Copy the start join addresses
 	result.StartJoin = make([]string, 0, len(a.StartJoin)+len(b.StartJoin))

command/agent/config_test.go

@@ -270,7 +270,7 @@ func TestDecodeConfig(t *testing.T) {
 	}
 
 	// Syslog
-	input = `{"enable_syslog": true}`
+	input = `{"enable_syslog": true, "syslog_facility": "LOCAL4"}`
 	config, err = DecodeConfig(bytes.NewReader([]byte(input)))
 	if err != nil {
 		t.Fatalf("err: %s", err)
@@ -279,6 +279,9 @@ func TestDecodeConfig(t *testing.T) {
 	if !config.EnableSyslog {
 		t.Fatalf("bad: %#v", config)
 	}
+	if config.SyslogFacility != "LOCAL4" {
+		t.Fatalf("bad: %#v", config)
+	}
 
 	// Rejoin
 	input = `{"rejoin_after_leave": true}`

website/source/docs/agent/options.html.markdown

@@ -257,6 +257,9 @@ definitions support being updated during a reload.
   Consul will stream various telemetry information to that instance for aggregation.
   This can be used to capture various runtime information.
 
+* `syslog_facility` - When `enable_syslog` is provided, this controls which
+  facility messages are sent to. By default, `LOCAL0` will be used.
+
 * `verify_incoming` - If set to True, Consul requires that all incoming
   connections make use of TLS, and that the client provides a certificate signed
   by the Certificate Authority from the `ca_file`. By default, this is false, and