Where is a log file with logs from a container

Question

I am running several containers using docker-compose  I can see application logs with command docker-compose logs  However I would like to access raw log file to send it somewhere for example  Where is it located  I guess it s separate log per each container  inside container   but where I can find it

User · Answer

You can docker inspect each container to see where their logs are   docker inspect --format     LogPath     INSTANCE ID     And  in case you were trying to figure out where the logs were to manage their collective size  or adjust parameters of the logging itself you will find the following relevant   Fixing the amount of space reserved for the logs  This is taken from Request for the ability to clear log history  issue 1083        Docker 1 8 and docker-compose 1 4 there is already exists a method to limit log size using docker compose log driver and log-opt max-size    mycontainer          log driver   json-file    log opt        limit logs to 2MB  20 rotations of 100K each      max-size   100k      max-file   20       In docker compose files of version  2    the syntax changed a bit    version   2      mycontainer          logging       limit logs to 200MB  4rotations of 50M each      driver   json-file      options        max-size   50m        max-file   4     note that in both syntaxes  the numbers are expressed as strings  in quotes   Possible issue with docker-compose logs not terminating   issue 1866  command logs doesn t exit if the container is already stopped

User · Answer

To see how much space each container s log is taking up  use this   docker ps -qa   xargs docker inspect --format     LogPath      xargs ls -hl    you might need a sudo before ls

User · Answer

To see the size of logs per container  you can use this bash command   for cont id in   docker ps -aq   do cont name   docker ps   grep  cont id   awk    print  NF      amp  amp  cont size   docker inspect --format     LogPath     cont id   xargs sudo ls -hl   awk    print  5      amp  amp  echo  quot  cont name   cont id    cont size quot   done  Example output  container name  6eed984b29da   13M elegant albattani  acd8f73aa31e   2 3G

User · Answer

On Windows  the default location is  C  ProgramData Docker containers  lt container-id gt -json log

User · Answer

A container s logs can be found in     var lib docker containers  lt container id gt   lt container id gt -json log    if you use the default log format which is json

User · Answer

To directly view the logfile in less  I use   docker inspect  1   grep  LogPath    sed -n  s        var          1 p    xargs sudo less   run as   viewLogs sh CONTAINERNAME

User · Answer

docker inspect  lt containername gt    grep log

User · Answer

Here is the location for Windows 10   WSL 2   Ubuntu 20 04   Docker version 20 10 2  build 2291f61 Lets say DOCKER ARTIFACTS      wsl  docker-desktop-data version-pack-data community docker Location of container logs can be found in DOCKER ARTIFACTS containers  Your container ID   Your container ID -json log Here is an example

User · Answer

As of 8 22 2018  the logs can be found in     data docker containers  lt container id gt   lt container id gt -json log

[docker] Where is a log file with logs from a container?

Examples related to docker

Examples related to docker-compose