Mosquitto configuration files -- /etc/mosquitto/mosquitto.conf and /etc/mosquitto/conf.d/connect.conf

connect.conf

# Custom Mosquitto Configuration
# /etc/mosquitto/conf.d/connect.conf
#
# Stored in conf.d to survive package updates
# DO NOT duplicate pid_file or include_dir here

# -----------------------------------------------
# Per listener security settings
# -----------------------------------------------
per_listener_settings true

# -----------------------------------------------
# Persistence
# -----------------------------------------------
persistence true
persistence_location /var/lib/mosquitto/

# -----------------------------------------------
# Logging
# -----------------------------------------------
log_dest file /var/log/mosquitto/mosquitto.log
log_type error
log_type warning
log_type notice
log_type information

# -----------------------------------------------
# Listener block - keep settings together
# -----------------------------------------------
listener 1883
bind_address 0.0.0.0
allow_anonymous false
password_file /etc/mosquitto/passwd

_________________________________________________________________________________

Key Rules Followed:

Setting
Location
Reason

pid_file
mosquitto.conf only
One instance only

include_dir
mosquitto.conf only
No recursive loop

Listener settings
connect.conf
Safe from updates

Persistence
connect.conf
Safe from updates

Logging
connect.conf
Safe from updates

Test Before Running:

_________________________________________________________________________________ 

 

bash

# Test configuration
sudo mosquitto -c /etc/mosquitto/mosquitto.conf --test-config

# Expected clean output
# No errors = ready to go

# Restart broker
sudo systemctl restart mosquitto

# Verify running
sudo systemctl status mosquitto

mosquitto.conf

Sure! Here’s a clean complete example based on what we saw in Charles’s setup tonight:
/etc/mosquitto/mosquitto.conf  03/26/2026 Claude (Anthropic AI)

 
# Mosquitto Configuration File
# /etc/mosquitto/mosquitto.conf
#
# Managed by package updates - keep custom config in conf.d/
# Full documentation at /usr/share/doc/mosquitto/examples/mosquitto.conf

# -----------------------------------------------
# Core broker settings - keep here, not in conf.d
# -----------------------------------------------

pid_file /run/mosquitto/mosquitto.pid

# Pull in custom configuration files
include_dir /etc/mosquitto/conf.d
/etc/mosquitto/conf.d/connect.conf