Error "502 Bad Gateway" Is Reported During the Access to MRS Manager

Issue

Error 502 Bad Gateway is reported when a user attempts to access MRS Manager.

Symptom

In an MRS cluster with Kerberos authentication disabled, an error message is displayed when you access the MRS Manager page.

Figure 1 Error message

Cause Analysis

The MRS domain name is changed from console-emr to mrs. As a result, the link between the common cluster and MRS Manager is incorrect.

Procedure

1. Log in to each Master node as user root.
2. Go to the /opt/knox/conf/ directory and find the ext.properties file.

   

3. Change the value of console-emr in the ext.properties file on all Master nodes to mrs.

   

4. Go to the /opt/knox/bin/ directory and run the su - omm command to switch to user omm.
5. Run the restart-knox.sh script to restart the knox service.
6. Try to access MRS Manager again.