Clean container logs with docker image (if you don't have permission...)

docker-clear-log.sh

#!/bin/bash -e

CONTAINER=$1

if [[ -z $CONTAINER ]]; then
        echo "No container specified"
        exit 1
fi

if [[ "$(docker ps -aq -f name=^/${CONTAINER}$ 2> /dev/null)" == "" ]]; then

        CONTAINER="$(docker-compose ps $CONTAINER 2> /dev/null | awk 'END {print $1}')"

        if [[ -z $CONTAINER ]]; then
                echo "Container \"$1\" does not exist, exiting."
                exit 1
                fi
fi

log=$(docker inspect -f '{{.LogPath}}' $CONTAINER 2> /dev/null)
PATH_DOCKER="/home/docker"
log=${log#$PATH_DOCKER}

docker run -it --rm -v $PATH_DOCKER:/data --name mycontainer myalpineimage -c "truncate -s 0 /data${log}"

Dockerfile

FROM alpine:latest
RUN mkdir /data
VOLUME ["/data"]
ENTRYPOINT ["/bin/sh"]