It's not possible to create snapshots for containers with long names.
To reproduce:
Container name seems to be limited to 63 characters:
* trying to create a container with 64 characters fails - that's OK,
here, we just wanted to know what the limit for a container name is:
# lxc copy base
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgggg
error: Container name isn't a valid hostname.
* trying to create a container with less characters (63, 62 and 61)
succeeds:
# lxc copy base-uni-web01
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggg
# lxc copy base-uni-web01
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg
# lxc copy base-uni-web01
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffg
* Now, let's try to create a snapshot - container name with 63
characters:
# lxc snapshot
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggg snapname
error: Failed to set LXC config:
lxc.utsname=aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggg/snapname
# lxc snapshot
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggg snap
error: Failed to set LXC config:
lxc.utsname=aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggg/snap
# lxc snapshot
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggg s
error: Failed to set LXC config:
lxc.utsname=aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffggg/s
* Trying to create a snapshot for a container with 62 character name -
it's only possible to set one character snapshot name:
# lxc snapshot
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg snapshot
error: Failed to set LXC config:
lxc.utsname=aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg/snapshot
# lxc snapshot
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg snap
error: Failed to set LXC config:
lxc.utsname=aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg/snap
# lxc snapshot
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg sn
error: Failed to set LXC config:
lxc.utsname=aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg/sn
# lxc snapshot
aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgg s
#
Feature or bug?
In my opinion a bug, counter intuitive, makes scripting hard.
Tomasz Chmielewski
http://wpkg.org
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