Public bug reported:
shiftfs transparently translates the on-disk ids of an underlaying
filesystem into valid ids in a given user namespace. This is wanted in
Ubuntu for LXD and Anbox and is targeted for inclusion in Disco.
The main advantage of shiftfs is that it provides signficiant
performance benefits as it lets us avoid recursively chowning the root
filesystem for unprivileged containers when they are created or when
their idmap is changed. This becomes very important with workloads where
we are running a huge number of containers which Anbox and LXD both are
currently doing. Other container runtimes will benefit from shiftfs in
Ubuntu as well.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Seth Forshee (sforshee)
Status: Fix Committed
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1823186
Title:
Add uid shifting overlay filesystem (shiftfs)
Status in linux package in Ubuntu:
Fix Committed
Bug description:
shiftfs transparently translates the on-disk ids of an underlaying
filesystem into valid ids in a given user namespace. This is wanted in
Ubuntu for LXD and Anbox and is targeted for inclusion in Disco.
The main advantage of shiftfs is that it provides signficiant
performance benefits as it lets us avoid recursively chowning the root
filesystem for unprivileged containers when they are created or when
their idmap is changed. This becomes very important with workloads
where we are running a huge number of containers which Anbox and LXD
both are currently doing. Other container runtimes will benefit from
shiftfs in Ubuntu as well.
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