Troubleshooting MapR POSIX Client Upgrades
About this task
If the mapr-loopbacknfs service fails to start after an upgrade,
check if a shared memory segment lock was the cause of the failure using this
procedure.
Procedure
- Open the loopbacknfs.log file. The loopbacknfs.log file is in the following directory: /usr/local/mapr-loopbacknfs/logs/
-
Check for the following string:
Create/Attach to shm failed -
If the string exists perform the following steps:
-
Run the following command to identify the shmid of the lock:
ipcs -m | grep 0x0000161c - Run the following command to remove the lock: ipcrm -m <shm id>
- Start the mapr-loopbacknfs service.
-
Run the following command to identify the shmid of the lock: