= MQTT =

Create 3 folders and 3 config files as following
{{{
[krit@mini MQTT]$ tree .
.
└── mosquitto
    ├── config
    │   ├── acls.conf
    │   ├── mosquitto.conf
    │   └── passwd
    ├── data
    └── log

4 directories, 3 files
[krit@mini MQTT]$ 
}}}

In mosquitto.conf, we put following config
{{{
[krit@mini MQTT]$ cat mosquitto/config/mosquitto.conf 
# following two lines required for > v2.0
#allow_anonymous true
listener 1883
persistence true
persistence_location /mosquitto/data/
log_dest file /mosquitto/log/mosquitto.log

allow_anonymous false
password_file /mosquitto/config/passwd
acl_file /mosquitto/config/acls.conf
}}}

We create user 'alice' for Mqtt broker with command
{{{
[krit@mini MQTT]$ mosquitto_passwd ./mosquitto/config/passwd alice
}}}

With ACL (Access Control List), we allow user to pub/sub to specific topic by
{{{
[krit@mini MQTT]$ cat mosquitto/config/acls.conf 

user admin
topic #

user alice
topic readwrite cat/#

user bob
topic read  gw/+/status/#
topic write gw/+/cmd/#
}}}

Then, we can run mosquitto with following
{{{
[krit@mini MQTT]$ docker run -it --name mosquitto -p 1883:1883 -v $(pwd)/mosquitto:/mosquitto/ eclipse-mosquitto
}}}

If we need to add/del/modify any config files in '''passwd''' or '''acls.conf''', we just restart the docker with
{{{
[krit@mini MQTT]$ docker restart mosquitto
}}}

== Docker compose ==

The owner and permission of each file
{{{
[root@Mosh Mosquitto]# tree .
.
├── docker-compose.yml
└── mosquitto
    ├── config
    │   ├── acls.conf
    │   ├── mosquitto.conf
    │   └── passwd
    ├── data
    │   └── mosquitto.db
    └── log
        └── mosquitto.log

4 directories, 6 files
[root@Mosh Mosquitto]# ls -l mosquitto/log/
total 8
-rwxr-xr-x 1 krit krit 5963 Aug 29 11:38 mosquitto.log
[root@Mosh Mosquitto]# ls -l mosquitto/data/
total 4
-rw------- 1 krit krit 47 Aug 29 11:36 mosquitto.db
[root@Mosh Mosquitto]# 

}}}

docker-compose.yml file should be following. Pls note user: "1000:1000" the number 1000 from command to check your '''id -u''' and '''id -g'''.
{{{
mosquitto:
    image: eclipse-mosquitto
    hostname: mosquitto
    container_name: mosquitto
    user: "1000:1000"
    ports:
      - 1883:1883
      - 9001:9001
    volumes:
      - ./mosquitto/config:/mosquitto/config
      - ./mosquitto/log:/mosquitto/log
      - ./mosquitto/data:/mosquitto/data
}}}

To start run
{{{
[krit@Mosh Mosquitto]$ docker-compose up -d
}}}