mosquitto

running mosquitto 1.4 overnight, see "Error saving in-memory database, unable to open /var/tmp/m2.db.new for writing, Error: permission denied"

Asked by leo

Hi,
i test to run "sudo mosquitto -v -c /etc/mosquitto/mosquitto.conf" overnight, then see some error messages as below:
Saving in-memory database to /var/tmp/m2.db
Error saving in-memory database, unable to open /var/tmp/m2.db.new for writing
Error: Permission denied.

how to fix this? thanks

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Roger Light
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Best Roger Light (roger.light) said : 		#1

If run as root, mosquitto will drop privileges to the "mosquitto" user. If that user does not have permission to the /var/tmp/ directory, it cannot write the persistence file. I would suggest making /var/lib/mosquitto/ and changing the owner to mosquitto, then using that as your persistence location.

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leo (chleoxu99) said : 		#2

thanks for your suggestion, Roger.
i change to use "persistence_location /var/lib/mosquitto/" in the .conf file

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leo (chleoxu99) said : 		#3

Thanks Roger Light, that solved my question.