incorrect encoding of rsyslog output

Question

I'm running a rsyslog service in a docker container.

Its configuration(rsyslog.conf) looks like below,

module(load="imuxsock") # local system logging support (e.g. via logger command)

module(load="imudp") # UDP listener support module(load="imtcp")

module(load="mmutf8fix")

action(type="mmutf8fix")

LOCAL1.* action(type="omfile" file="/var/log/my.log")

The client program is Java program that is using logback to write the log to both local file and remote rsyslog service.

The local log file looks like for non-ascii characters, whose encoding is UTF-8.

However the output file of rsyslog is NOT UTF-8. Of course the non-ascii characters can not be shown properly.

➜ rsyslog git:(master) ✗ file /volume/disk/logs/svt/my.log

/volume/disk/logs/svt/my.log: ASCII text, with very long lines

I'm wondering how to configure rsyslog to write output as UTF-8, there is no obvious solution after searching Google.

Answer 1

I solved it.

The problem is that the default locale of the container is not UTF-8. I'm using alpine linux as the OS of rsyslog container. Finally adding below environment declarations in Dockerfile to fix the encoding issue.

ENV LC_ALL en_US.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US.UTF-8