In Cloudera Manager 5.7 and higher, Cloudera Manager automatically detects when more than one instance of Cloudera Manager is running and logs a message in the /var/log/cloudera-scm-server/cloudera-scm-server.log file. For example:

2016-02-17 09:47:27,915 WARN

main:com.cloudera.server.cmf.components.ScmActive:

ScmActive detected spurious CM : hostname=sysadmin-scm-2.mycompany.com/172.28.197.136,bootup true

2016-02-17 09:47:27,916 WARN

main:com.cloudera.server.cmf.components.ScmActive: ScmActive:

The database is owned by sysadmin-scm-1.mycompany.com/172.28.197.242

2016-02-17 09:47:27,917 ERROR main:com.cloudera.server.cmf.bootstrap.EntityManagerFactoryBean: ScmActiveat bootup:

The configured database is being used by another instance of Cloudera Manager.

In addition, the second instance of Cloudera Manager is automatically shut down, resulting in messages similar to the following in the log file:

2016-02-17 09:47:27,919 ERROR main:com.cloudera.server.cmf.Main: Serverfailed.2016-02-17 09:47:27,919

ERROR main:com.cloudera.server.cmf.Main: Serverfailed.org.springframework.beans.factory.BeanCreationException:

Error creatingbean with name 'com.cloudera.server.cmf.TrialState':

Cannot resolvereference to bean 'entityManagerFactoryBean' while setting constructorargument;

nested exception isorg.springframework.beans.factory.BeanCreationException:

Error creatingbean with name 'entityManagerFactoryBean':

FactoryBean threw exception onobject creation; nested exception is java.lang.RuntimeException: ScmActiveat bootup:

Failed to validate the identity of Cloudera Manager.

You can disable automatic shutdown by setting a Java option and restarting Cloudera Manager:

1. On the host where Cloudera Manager server is running, open the following file in a text editor:

   /etc/default/cloudera-scm-server

2. Add the following property (separate each property with a space) to the line that begins with export CMF_JAVA_OPTS:

   -Dcom.cloudera.server.cmf.components.scmActive.killOnError=false

   For example:

   export CMF_JAVA_OPTS="-Xmx2G -XX:MaxPermSize=256m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp -Dcom.cloudera.server.cmf.components.scmActive.killOnError=false”
   

3. Restart the Cloudera Manager server by running the following command on the Cloudera Manager server host:

   sudo service cloudera-scm-server restart

以上。