diff --git a/analyses.go b/analyses.go
index 8249f0a..74b5ed2 100644
--- a/analyses.go
+++ b/analyses.go
@@ -648,85 +648,92 @@ func getTimeLimit(ctx context.Context, dedb *sql.DB, analysisID string) (int64,
 func CreateMessageHandler(dedb *sql.DB) func(context.Context, amqp.Delivery) {
 	return func(ctx context.Context, delivery amqp.Delivery) {
 		var err error
+		msgLog := log.WithFields(log.Fields{"context": "message handler"})
 
 		if err = delivery.Ack(false); err != nil {
-			log.Error(err)
+			msgLog.Error(err)
 		}
 
 		update := &messaging.UpdateMessage{}
 
 		if err = json.Unmarshal(delivery.Body, update); err != nil {
-			log.Error(errors.Wrap(err, "error unmarshaling body of update message"))
+			msgLog.Error(errors.Wrap(err, "error unmarshaling body of update message"))
 			return
 		}
 
 		var externalID string
 		if update.Job.InvocationID == "" {
-			log.Error("external ID was not provided as the invocation ID in the status update, ignoring update")
+			msgLog.Error("external ID was not provided as the invocation ID in the status update, ignoring update")
 			return
 		}
 		externalID = update.Job.InvocationID
+		msgLog = msgLog.WithFields(log.Fields{"externalID": externalID})
 
 		analysis, err := lookupByExternalID(ctx, dedb, externalID)
 		if err != nil {
-			log.Error(errors.Wrapf(err, "error looking up analysis by external ID '%s'", externalID))
+			msgLog.Error(errors.Wrapf(err, "error looking up analysis by external ID '%s'", externalID))
 			return
 		}
+		msgLog = msgLog.WithFields(log.Fields{"ID": analysis.ID})
 
 		analysisIsInteractive, err := isInteractive(ctx, dedb, analysis.ID)
 		if err != nil {
-			log.Error(errors.Wrapf(err, "error looking up interactive status for analysis %s", analysis.ID))
+			msgLog.Error(errors.Wrapf(err, "error looking up interactive status for analysis %s", analysis.ID))
 			return
 		}
 
 		if !analysisIsInteractive {
-			log.Infof("analysis %s is not interactive, so move along", analysis.ID)
+			msgLog.Infof("analysis %s is not interactive, so move along", analysis.ID)
 			return
 		}
 
 		if update.State != "Running" {
-			log.Infof("job status update for %s was %s, moving along", analysis.ID, update.State)
+			msgLog.Infof("job status update for %s was %s, moving along", analysis.ID, update.State)
 			return
 		}
 
-		log.Infof("job status update for %s was %s", analysis.ID, update.State)
+		msgLog.Infof("job status update for %s was %s", analysis.ID, update.State)
 
 		// Set the subdomain
 		if analysis.Subdomain == "" {
 			// make sure to use analysis.ID, not external ID here.
 			userID, err := getUserIDForJob(ctx, dedb, analysis.ID)
 			if err != nil {
-				log.Error(errors.Wrapf(err, "error getting userID for job %s", analysis.ID))
+				msgLog.Error(errors.Wrapf(err, "error getting userID for job %s", analysis.ID))
 			} else {
-				log.Infof("user id is %s and invocation id is %s", userID, externalID)
+				msgLog = msgLog.WithFields(log.Fields{"userID": userID})
+				msgLog.Infof("user id is %s and invocation id is %s", userID, externalID)
 
 				// make sure to use externalID, not analysis.ID here
 				subdomain := generateSubdomain(userID, externalID)
 
-				log.Infof("generated subdomain for analysis %s is %s, based on user ID %s and invocation ID %s", analysis.ID, subdomain, userID, externalID)
+				msgLog.Infof("generated subdomain for analysis %s is %s, based on user ID %s and invocation ID %s", analysis.ID, subdomain, userID, externalID)
 
 				if err = setSubdomain(ctx, dedb, analysis.ID, subdomain); err != nil {
-					log.Error(errors.Wrapf(err, "error setting subdomain for analysis '%s' to '%s'", analysis.ID, subdomain))
+					msgLog.Error(errors.Wrapf(err, "error setting subdomain for analysis '%s' to '%s'", analysis.ID, subdomain))
 				}
+				msgLog = msgLog.WithFields(log.Fields{"subdomain": subdomain})
 			}
+		} else {
+			msgLog = msgLog.WithFields(log.Fields{"subdomain": analysis.Subdomain})
 		}
 
 		// Check to see if the planned_end_date is set for the analysis
 		if analysis.PlannedEndDate != "" {
-			log.Infof("planned end date for %s is set to %s, nothing to do", analysis.ID, analysis.PlannedEndDate)
+			msgLog.Infof("planned end date for %s is set to %s, nothing to do", analysis.ID, analysis.PlannedEndDate)
 			return // it's already set, so move along.
 		}
 
 		startDate, err := time.Parse(TimestampFromDBFormat, analysis.StartDate)
 		if err != nil {
-			log.Error(errors.Wrapf(err, "error parsing start date field %s", analysis.StartDate))
+			msgLog.Error(errors.Wrapf(err, "error parsing start date field %s", analysis.StartDate))
 			return
 		}
 		sdnano := startDate.UnixNano()
 
 		timeLimitSeconds, err := getTimeLimit(ctx, dedb, analysis.ID)
 		if err != nil {
-			log.Error(errors.Wrapf(err, "error fetching time limit for analysis %s", analysis.ID))
+			msgLog.Error(errors.Wrapf(err, "error fetching time limit for analysis %s", analysis.ID))
 			return
 		}
 
@@ -734,7 +741,7 @@ func CreateMessageHandler(dedb *sql.DB) func(context.Context, amqp.Delivery) {
 		// then convert back to milliseconds.
 		endDate := time.Unix(0, sdnano).Add(time.Duration(timeLimitSeconds)*time.Second).UnixNano() / 1000000
 		if err = setPlannedEndDate(ctx, dedb, analysis.ID, endDate); err != nil {
-			log.Error(errors.Wrapf(err, "error setting planned end date for analysis '%s' to '%d'", analysis.ID, endDate))
+			msgLog.Error(errors.Wrapf(err, "error setting planned end date for analysis '%s' to '%d'", analysis.ID, endDate))
 		}
 	}
 }