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[jira] [Created] (FLINK-9685) Flink should support hostname-substitution for security.kerberos.login.principal


Ethan Li created FLINK-9685:
-------------------------------

             Summary: Flink should support hostname-substitution for security.kerberos.login.principal
                 Key: FLINK-9685
                 URL: https://issues.apache.org/jira/browse/FLINK-9685
             Project: Flink
          Issue Type: Improvement
            Reporter: Ethan Li


[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/security/SecurityConfiguration.java#L83]

 

We can have something like this
{code:java}
String rawPrincipal = flinkConf.getString(SecurityOptions.KERBEROS_LOGIN_PRINCIPAL);
if (rawPrincipal != null) {
   try {
      rawPrincipal = rawPrincipal.replace("HOSTNAME", InetAddress.getLocalHost().getCanonicalHostName());
   } catch (UnknownHostException e) {
      LOG.error("Failed to replace HOSTNAME with localhost because {}", e);
   }
}
this.principal = rawPrincipal;
{code}

So it will be easier to deploy flink to cluster. Instead of setting different principal on every node, we can have the same principal headless_user/HOSTNAME@DOMAIN .



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