In Ubuntu 12.04 it seems that /var/run points to /run and is mounted as tmpfs, i.e. It does not persist across restarts. However, in CentOS 6.5 /var/run just resides on the regular filesystem and is not wiped upon reboot. My question: is there an advantage mounting /var/run as tmpfs? And how does the system determine its maximum size? What if it becomes full?
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