Docker mosquitto - Error unable to load auth plugin - docker

Question

I really need your help !
I'm encountering a problem with the loading of a plugin in a docker mosquitto.
I tried to load it on a local version of mosquitto and it worked well.
The error return in the docker console is:
dev_instance_mosquitto_1 exited with code 13
The errors return in the log file of mosquitto are:
1626352342: Loading plugin: /mosquitto/config/mosquitto_message_timestamp.so
1626352342: Error: Unable to load auth plugin "/mosquitto/config/mosquitto_message_timestamp.so".
1626352342: Load error: Error relocating /mosquitto/config/mosquitto_message_timestamp.so: __sprintf_chk: symbol not found
Here is a tree output of the project:
mosquitto/
├── Dockerfile
├── config
│ ├── acl
│ ├── ca_certificates
│ │ ├── README
│ │ ├── broker_CA.crt
│ │ ├── mqtt.test.perax.com.p12
│ │ ├── private_key.key
│ │ └── server_ca.crt
│ ├── certs
│ │ ├── CA_broker_mqtt.crt
│ │ ├── README
│ │ ├── serveur_broker.crt
│ │ └── serveur_broker.key
│ ├── conf.d
│ │ └── default.conf
│ ├── mosquitto.conf
│ ├── mosquitto_message_timestamp.so
│ └── pwfile
├── data
│ └── mosquitto.db
└── log
└── mosquitto.log
Here is the Dockerfile:
FROM eclipse-mosquitto
COPY config/ /mosquitto/config
COPY config/mosquitto_message_timestamp.so /usr/lib/mosquitto_message_timestamp.so
RUN install /usr/lib/mosquitto_message_timestamp.so /mosquitto/config/
here is the docker-compose.yml:
mosquitto:
restart: always
build: ./mosquitto/
image: "eclipse-mosquitto/latests"
ports:
- "1883:1883"
- "9001:9001"
volumes:
- ./mosquitto/config/:/mosquitto/config/
- ./mosquitto/data/:/mosquitto/data/
- ./mosquitto/log/mosquitto.log:/mosquitto/log/mosquitto.log
user: 1883:1883
environment:
- PUID=1883
- PGID=1883
Here is the mosquitto.conf:
persistence true
persistence_location /mosquitto/data
log_dest file /mosquitto/log/mosquitto.log
include_dir /mosquitto/config/conf.d
plugin /mosquitto/config/mosquitto_message_timestamp.so
I'm using mosquitto 2.0.10 on a ubuntu serveur with the version 18.04.5 LTS.
In thanking you for your help.

Answer 1

Your best bet here is probably to set up a multi step Docker build file that uses an Alpine based image to build the plugin then copy it into the eclipse-mosquitto image.