https://github.com/Azure/sonic-buildimage/blob/b57a3766227841b1f7dcb7ee99a3626db510e741/dockers/docker-database/Dockerfile.j2#L4 should be <pre> RUN [ -f /etc/rsyslog.conf ] && sed -ri "s/%syslogtag%/$docker_container_name#%syslogtag%/;" /etc/rsyslog.conf </pre>