Public bug reported:
lxc-clone documents the backingstore option as "Select a different
backing store for the new container. By default the same as the original
container's is used.". This sounds like if the original container uses
btrfs, the cloned container should as well.
I have the LXC data dir on btrfs, and did lxc-create -n adt-xenial -B
best. This correctly selected btrfs backing store:
ID 293 gen 16369 top level 5 path lxc/adt-xenial/rootfs
However, cloning is slow:
$ time sudo lxc-clone -o adt-xenial -n x1
Created container x1 as copy of adt-xenial
real0m9.417s
user0m1.359s
sys 0m4.436s
It did create a new btrfs snapshot:
ID 297 gen 16372 top level 5 path lxc/x1/rootfs
but apparently not as a copy of the original lxc/adt-xenial/rootfs one.
If I explicitly select btrfs as backingstore, it works as intended:
$ time sudo lxc-clone -B btrfs -o adt-xenial -n x1
Created container x1 as copy of adt-xenial
real0m0.136s
user0m0.004s
sys 0m0.012s
However, for scripts this is impractical, as it's not quite obvious how
to determine whether the original container uses btrfs backing store,
and "-B best" (which works for lxc-create) does not work for lxc-clone.
So it seems lxc-clone does not actually use "the same -B as the original
container"?
I haven't tested this for other backing stores.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lxc 1.1.5-0ubuntu3
ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
Uname: Linux 4.3.0-5-generic x86_64
ApportVersion: 2.19.3-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jan 8 10:10:03 2016
EcryptfsInUse: Yes
SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)
defaults.conf:
lxc.network.type = veth
lxc.network.link = lxcbr0
lxc.network.flags = up
lxc.network.hwaddr = 00:16:3e:xx:xx:xx
lxc.conf: lxc.lxcpath = /srv/lxc
** Affects: lxc (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apparmor apport-bug xenial
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https://bugs.launchpad.net/bugs/1532125
Title:
lxc-clone: Use btrfs backing store if original container does
Status in lxc package in Ubuntu:
New
Bug description:
lxc-clone documents the backingstore option as "Select a different
backing store for the new container. By default the same as the
original container's is used.". This sounds like if the original
container uses btrfs, the cloned container should as well.
I have the LXC data dir on btrfs, and did lxc-create -n adt-xenial -B
best. This correctly selected btrfs backing store:
ID 293 gen 16369 top level 5 path lxc/adt-xenial/rootfs
However, cloning is slow:
$ time sudo lxc-clone -o adt-xenial -n x1
Created container x1 as copy of adt-xenial
real 0m9.417s
user 0m1.359s
sys 0m4.436s
It did create a new btrfs snapshot:
ID 297 gen 16372 top level 5 path lxc/x1/rootfs
but apparently not as a copy of the original lxc/adt-xenial/rootfs
one.
If I explicitly select btrfs as backingstore, it works as intended:
$ time sudo lxc-clone -B btrfs -o adt-xenial -n x1
Created container x1 as copy of adt-xenial
real 0m0.136s
user 0m0.004s
sys 0m0.012s
However, for scripts this is impractical, as it's not quite obvious
how to determine whether the original container uses btrfs backing
store, and "-B best" (which works for lxc-create) does not work for
lxc-clone. So it seems lxc-clone does not actually use "the same -B as
the original container"?
I haven't tested this for other backing stores.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lxc 1.1.5-0ubuntu3
ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
Uname: Linux 4.3.0-5-generic x86_64
ApportVersion: 2.19.3-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jan 8 10:10:03 2016
EcryptfsInUse: Yes
SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)
defaults.conf:
lxc.network.type = veth
lxc.network.link = lxcbr0
lxc.network.flags = up
lxc.network.hwaddr = 00:16:3e:xx:xx:xx
lxc.conf: lxc.lxcpath = /srv/lxc
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