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Remount /var/lib/docker as --private to fix scaling issue
If an admin mounts all file systems as -rshared (Default on RHEL and Fedora) we see a scaling problem as the number of container increase. Basically every new container needs to have it new mounts in /var/lib/docker shared to all other containers, this ends up with us only able to scale to around 100 containers, before the system slows down. By simply bind mounting /var/lib/docker on its and then setting it private, the scaling issue goes away. Docker-DCO-1.1-Signed-off-by: Dan Walsh <firstname.lastname@example.org> (github: rhatdan)
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