mosquitto - Broker won't start with persistence configuration

Question

mosquitto does not seem to like the following options for persistence.

# Persistence configuration
persistence true
persistence_location /data/qos/
persistent_client_expiration 8h

The /data/qos does exist and permissions have been set.

sudo chown mosquitto:mosquitto /data/qos

The persistence configuration options are in a file persist.conf placed under /etc/mosquitto/conf.d directory. Before copying, I am stopping the broker and starting it again after copying using commands like this:

sudo service mosquitto stop
sudo service mosquitto start

The /var/log/mosquitto/mosquitto.log does not give any clue about what could be the issue.

So, what's wrong with the options provided above for persistence?

Answer 1

As mentioned in the post above, the persistence configuration options were provided in a separate file - persist.conf placed under /etc/mosquitto/conf.d directory. However, there are persistence options already present in /etc/mosquitto/mosquitto.conf. Once I removed these, the settings in persist.conf went through.

It would have been nice of mosquitto to warn of such conflicts.