Get mb/days of logfile for a docker container

logs-per-hour.sh

#!/usr/bin/env sh

# Usage: call with docker container name, requires stat
# E.g. sudo ./logs-per-hour project_service_1

id=$(docker inspect $1 --format "{{ .ID }}")

started_date=$(docker inspect $id --format "{{ .Created}}")
started=$(date +%s -d ${started_date})
now=$(date +%s)

diff=$(($now - $started))
diff_days=$(awk -v diff=$diff 'BEGIN { print diff / 86400}')

log_size=$(stat --printf="%s" /var/lib/docker/containers/$id/$id-json.log)
log_size_mb=$(awk -v b=$log_size 'BEGIN { print b / 1024 }')

log_mb_per_day=$(awk -v bytes=$log_size_mb -v days=$diff_days 'BEGIN { print bytes / days }')

echo "$1: $log_mb_per_day mb/day"