Update based on PR request.

client/driver/executor/executor.go

@@ -3,6 +3,7 @@ package executor
 import (
 	"context"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"log"
 	"net"
@@ -28,6 +29,8 @@ import (
 	shelpers "github.com/hashicorp/nomad/helper/stats"
 	"github.com/hashicorp/nomad/nomad/structs"
 
+	syslog "github.com/RackSec/srslog"
+	
 	dstructs "github.com/hashicorp/nomad/client/driver/structs"
 	cstructs "github.com/hashicorp/nomad/client/structs"
 )
@@ -777,3 +780,40 @@ func (e *UniversalExecutor) Signal(s os.Signal) error {
 
 	return nil
 }
+
+func (e *UniversalExecutor) LaunchSyslogServer() (*SyslogServerState, error) {
+	// Ensure the context has been set first
+	if e.ctx == nil {
+		return nil, fmt.Errorf("SetContext must be called before launching the Syslog Server")
+	}
+
+	e.syslogChan = make(chan *logging.SyslogMessage, 2048)
+	l, err := e.getListener(e.ctx.PortLowerBound, e.ctx.PortUpperBound)
+	if err != nil {
+		return nil, err
+	}
+	e.logger.Printf("[DEBUG] syslog-server: launching syslog server on addr: %v", l.Addr().String())
+	if err := e.configureLoggers(); err != nil {
+		return nil, err
+	}
+
+	e.syslogServer = logging.NewSyslogServer(l, e.syslogChan, e.logger)
+	go e.syslogServer.Start()
+	go e.collectLogs(e.lre, e.lro)
+	syslogAddr := fmt.Sprintf("%s://%s", l.Addr().Network(), l.Addr().String())
+	return &SyslogServerState{Addr: syslogAddr}, nil
+}
+
+func (e *UniversalExecutor) collectLogs(we io.Writer, wo io.Writer) {
+	for logParts := range e.syslogChan {
+		// If the severity of the log line is err then we write to stderr
+		// otherwise all messages go to stdout
+		if logParts.Severity == syslog.LOG_ERR {
+			e.lre.Write(logParts.Message)
+			e.lre.Write([]byte{'\n'})
+		} else {
+			e.lro.Write(logParts.Message)
+			e.lro.Write([]byte{'\n'})
+		}
+	}
+}