currently have dockerfile build image entrypoint allows me run command in centos based container using docker run command. after command run, docker container stopped , removed.
however, command run generate log files inside docker container , these lost once container exits. best practice preserving these files (preferably can stored on host machine)?
this may solution: create named docker volume:
docker volume create --name centos-volume so path volume on host /var/lib/docker/volumes/centos-volume/_data
than created comparable app. dockerfile (copies script create log in container. start script when start container docker run (like did)):
from centos:7 run mkdir /script copy create-log.sh /script/ run chmod +x /script/create-log.sh content of script: (it creates logfile in /var/log/anaconda)
#!/bin/bash touch /var/log/anaconda/my-log.log echo "hello world" >> /var/log/anaconda/my-log.log i start container with:
docker run --rm -ti -v centos-volume:/var/log/anaconda/ my-centos ./script/create-log.sh so commands execute script in container , mounts content of /var/log/anaconda folder of container volume on host.
than check:
cat /var/lib/docker/volumes/centos-volume/_data/my-log.log hello world after rerunning container second log appears:
docker run --rm -ti -v centos-volume:/var/log/anaconda/ my-centos ./script/create-log.sh $ sudo su [root@localhost centos]# cat /var/lib/docker/volumes/centos-volume/_data/my-log.log hello world hello world 
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