Active MN Maintenance

In a dual-MN HA scenario, assume that MN1 is the active MN and MN2 is the backup MN.

If the administrator needs to temporarily shut down MN1 for maintenance, follow these steps:

1. Switch MN1 to the standby MN.

   In MN1, run the zsha2 demote command. Then, MN1 is switched to the backup MN online, and MN2 becomes the active MN after obtaining a VIP.

2. Stop MN1.
   • If MN1 is not added to ZStack as a compute node, follow these steps:
     1. Run the zsha2 stop-node command in MN1 to stop services related to zsha2.
     2. Shut down MN1.
     3. Maintain MN1 after shutdown.
   • If MN1 is reused as a compute node and added to ZStack, follow these steps:
     1. Run the zsha2 stop-node command in MN1 to stop services related to zsha2.
     2. Put MN1 into maintenance mode.
     3. Shut down MN1.
     4. Maintain MN1 after shutdown.
3. Start MN1.
   1. After powering on MN1, start the server manually or through IPMI.
   2. Wait for MN1 to start and successfully boot the operating system.
   3. In MN1, run the zsha2 start-node command to start services related to zsha2.
   4. In MN1, run the zsha2 status command to check whether the zsha2 service is running properly.
   5. In MN1, run the zstack-ctl status command to check whether the MN service and the UI are running properly.

Backup MN Maintenance

In a dual-MN HA scenario, assume that MN1 is the active MN and MN2 is the backup MN.