Merge pull request #8163 from zmstone/0609-default-node-name-emqx-when-running-in-docker

fix: run emqx in docker with 'emqx' as node name by default

deploy/docker/docker-entrypoint.sh

@@ -19,7 +19,7 @@ LOCAL_IP=$(hostname -i | grep -oE '((25[0-5]|(2[0-4]|1[0-9]|[1-9]|)[0-9])\.){3}(
 if [[ -z "$EMQX_NODE_NAME" ]]; then
 
     if [[ -z "$EMQX_NAME" ]]; then
-        EMQX_NAME="$(hostname)"
+        EMQX_NAME='emqx'
     fi
 
     if [[ -z "$EMQX_HOST" ]]; then