how to set timezone on docker image

[jipp]

I have the problem that I canot set the timezone on the docker image.

configuring the timestamp like this:
log_timestamp_format %m/%d/%y %H:%M:%S

give me an ofset from the UTC time to the CET (where I life)

tools needed to set the env seems not part of the docker image

[ralight]

If your container is called mosquitto, then run the command below to install the tzdata package, which will then let you set the timezone:

docker exec mosquitto apk add tzdata

[jipp]

Hi

tested it with docker-compose. so works and shows the correct timezone.

thx for the hint

[GerhardLang]

I have the same problem, my compose file (portainer) is:

services:
mosquitto:
image: eclipse-mosquitto
container_name: mosquitto
network_mode: host
restart: always
volumes:
- /volume1/docker/mosquitto/log/:/mosquitto/log
- /volume1/docker/mosquitto/data/:/mosquitto/data
- /volume1/docker/mosquitto/config/:/mosquitto/config
environment:
- TZ=Europe/Amsterdam

Do you have any idea ?

thank you for helping a newbee.

[jipp]

actually it is a little tricky/indirect.

You need to have a separate Dockerfile to add the tzdata to the official eclipse-mosquitto image. This one will build a new image including the missing package:

cat Dockerfile 
ARG version=latest

FROM eclipse-mosquitto:$version

WORKDIR /

RUN apk add --no-cache tzdata && \
    rm -rf /var/cache/apk/*

To get it now working you cannot use the default image inside the docker-compose yml file anymore. You have to add the reference/build instruction to it and also save the Dockerfile above to the directory where the .yml file is located:

services:
mosquitto:
#image: eclipse-mosquitto
build: .
container_name: mosquitto
network_mode: host
restart: always
volumes:
- /volume1/docker/mosquitto/log/:/mosquitto/log
- /volume1/docker/mosquitto/data/:/mosquitto/data
- /volume1/docker/mosquitto/config/:/mosquitto/config
environment:
- TZ=Europe/Amsterdam