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If you’re finding issues starting VM’s on your Citrix XenServers due to ballooning issues as mentioned below:

$ sudo xe vm-start name-label=vm1
The server failed to handle your request, due to an internal error. The given message may give details useful for debugging the problem.
message: Failure(“The ballooning daemon is not running”)

Then try this command then restart VM to find it working.

$ sudo xe-toolstack-restart
Stopping xapi: .. [ OK ]
Stopping the v6 licensing daemon: [ OK ]
Stopping the memory ballooning daemon: [FAILED]
Stopping perfmon: [FAILED]
Stopping the fork/exec daemon: [ OK ]
Stopping the multipath alerting daemon: [ OK ]
Starting the multipath alerting daemon: [ OK ]
Starting the fork/exec daemon: [ OK ]
Starting perfmon: [ OK ]
Starting the memory ballooning daemon: [ OK ]
Starting the v6 licensing daemon: [ OK ]
Starting xapi: ……start-of-day complete. [ OK ]
done.

Thanks for the pointers by https://www.krzywanski.net/archives/919