[Bug 1533639] Re: [ubuntu-cpc] please make /tmp a tmpfs in RAM

[Ben Howard]

As an alternative solution, I am wondering if we could make this be a
cloud-init function to give users control, with a default of /tmp being
a tmpfs when memory is sufficient (i.e. if you have less than 1G of RAM,
/tmp is tmpfs or you are in a container).

The other area where I think that this change might create a problem is
in high density container scenarios (running 200 LXC containers).

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https://bugs.launchpad.net/bugs/1533639

Title:
  [ubuntu-cpc] please make /tmp a tmpfs in RAM

Status in livecd-rootfs package in Ubuntu:
  Triaged

Bug description:
  In Ubuntu, we clear /tmp on every boot.

  As such, on servers, by default /tmp should actually be a tmpfs
  entirely in RAM.

  This has several advantages, mainly:
   * Performance - much faster read/write access to data in /tmp
   * Security - sensitive data would be cleared from memory on boot, rather than written (leaked) to disk -- important for encryption scenarios

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