johnmaher
(John Maher)
March 16, 2023, 1:18pm
1
I have two LXD hosts (norton and trixie) both running LXD version 5.0.2. For containers on each host I’m trying to create a backup on the other host. I’ve used lxc copy
to copy the container to the other host, but when I use lxc copy --refresh
I get the following:
$ lxc copy --refresh argus trixie:argus
Error: Failed instance creation: Error transferring instance data: Failed creating instance on target: Failed to run: btrfs receive -e /var/snap/lxd/common/lxd/storage-pools/default/containers/migration.4271173957/pre-nagios-install: exit status 1 (ERROR: cannot find parent subvolume)
It seems to have something to do with a snapshot (pre-nagios-install) that exists on the source (norton) but does not exist on the destination (trixie). But I would not expect any of the snapshots to exist on the destination after runing lxc copy
.
Any guidance would be great. Thanks.
johnmaher
(John Maher)
March 20, 2023, 11:42am
2
Anyone have any ideas why this is happening? Still a mystery.
tomp
(Thomas Parrott)
March 21, 2023, 4:54pm
3
Please can you provide the output of sudo zfs list -t all
on both servers?
Also please can you provide the output of lxc info <instance>
on both servers?
johnmaher
(John Maher)
March 22, 2023, 1:12pm
5
Hi @tomp . Thanks for replying. I’m using btrfs, not zfs, and I don’t know the equivalent command to run.
Here is the lxc info <instance>
you requested:
Source:
$ lxc info argus
Name: argus
Status: RUNNING
Type: container
Architecture: x86_64
PID: 2316
Created: 2023/02/24 14:46 EST
Last Used: 2023/03/03 15:57 EST
Resources:
Processes: 92
CPU usage:
CPU usage (in seconds): 1157
Memory usage:
Memory (current): 1.51GiB
Network usage:
eth0:
Type: broadcast
State: UP
Host interface: vethb35d1cee
MAC address: 00:16:3e:42:1d:a7
MTU: 1500
Bytes received: 153.56MB
Bytes sent: 29.66MB
Packets received: 262145
Packets sent: 270323
IP addresses:
inet: 10.173.120.49/24 (global)
inet6: fd42:6b70:a5f3:4878:216:3eff:fe42:1da7/64 (global)
inet6: fe80::216:3eff:fe42:1da7/64 (link)
lo:
Type: loopback
State: UP
MTU: 65536
Bytes received: 8.51MB
Bytes sent: 8.51MB
Packets received: 88842
Packets sent: 88842
IP addresses:
inet: 127.0.0.1/8 (local)
inet6: ::1/128 (local)
Snapshots:
+--------------------+----------------------+------------+----------+
| NAME | TAKEN AT | EXPIRES AT | STATEFUL |
+--------------------+----------------------+------------+----------+
| pre-nagios-install | 2023/02/27 08:57 EST | | NO |
+--------------------+----------------------+------------+----------+
| now | 2023/03/10 14:17 EST | | NO |
+--------------------+----------------------+------------+----------+
Destination:
$ lxc info argus
Name: argus
Status: STOPPED
Type: container
Architecture: x86_64
Created: 2023/03/16 08:59 EDT
Thanks.
johnmaher
(John Maher)
March 24, 2023, 6:54pm
6
Hi @tomp ,
Is there an equivalent command to sudo zfs list -t all
that I should run and post here? I still can’t figure out why this doesn’t work.
John
johnmaher
(John Maher)
March 27, 2023, 12:24pm
7
Hi @tomp . Is this something you can help with? I don’t know where to go from here.
Thanks.
tomp
(Thomas Parrott)
March 29, 2023, 7:22am
8
Please can you show output of lxc storage show <pool>
thanks
johnmaher
(John Maher)
March 29, 2023, 12:58pm
9
Please excuse my excitement, but I’m so glad to hear back from you @tomp . Thanks.
Here’s the info you requested:
Source:
$ lxc storage show default
config:
source: /var/snap/lxd/common/lxd/storage-pools/default
volatile.initial_source: /var/snap/lxd/common/lxd/storage-pools/default
description: ""
name: default
driver: btrfs
used_by:
- /1.0/images/5c035e7bc2eed8a377491458814c6db1bfff75df93c576cd57135f06567aa656
- /1.0/instances/argus
- /1.0/instances/argus/snapshots/now
- /1.0/instances/argus/snapshots/pre-nagios-install
- /1.0/instances/container-2204
- /1.0/instances/container-2204/snapshots/for-image-creation
- /1.0/instances/container-2204/snapshots/post-domain-join
- /1.0/instances/container-2204/snapshots/pre-domain-join
- /1.0/instances/idea
- /1.0/profiles/default
status: Created
locations:
- none
Destination:
(In case you just want info for the container in question:)
$ lxc storage show default
config:
source: /var/snap/lxd/common/lxd/storage-pools/default
volatile.initial_source: /var/snap/lxd/common/lxd/storage-pools/default
description: ""
name: default
driver: btrfs
used_by:
- /1.0/instances/argus
***(deleted other containers here)***
- /1.0/profiles/default
status: Created
locations:
- none
(In case you want all the info from the command:)
$ lxc storage show default
config:
source: /var/snap/lxd/common/lxd/storage-pools/default
volatile.initial_source: /var/snap/lxd/common/lxd/storage-pools/default
description: ""
name: default
driver: btrfs
used_by:
- /1.0/instances/apps-biochem
- /1.0/instances/apps-biochem/snapshots/backup20230315
- /1.0/instances/apps-biochem/snapshots/backup20230316
- /1.0/instances/apps-biochem/snapshots/backup20230317
- /1.0/instances/apps-biochem/snapshots/backup20230318
- /1.0/instances/apps-biochem/snapshots/backup20230319
- /1.0/instances/apps-biochem/snapshots/backup20230320
- /1.0/instances/apps-biochem/snapshots/backup20230321
- /1.0/instances/apps-biochem/snapshots/backup20230322
- /1.0/instances/apps-biochem/snapshots/backup20230323
- /1.0/instances/apps-biochem/snapshots/backup20230324
- /1.0/instances/apps-biochem/snapshots/backup20230325
- /1.0/instances/apps-biochem/snapshots/backup20230326
- /1.0/instances/apps-biochem/snapshots/backup20230327
- /1.0/instances/apps-biochem/snapshots/backup20230328
- /1.0/instances/apps-biochem/snapshots/backup20230329
- /1.0/instances/argus
- /1.0/instances/athena
- /1.0/instances/athena/snapshots/current
- /1.0/instances/athena/snapshots/now
- /1.0/instances/athena/snapshots/pre-cert-renewal-2023
- /1.0/instances/barnes
- /1.0/instances/barnes/snapshots/backup20230315
- /1.0/instances/barnes/snapshots/backup20230316
- /1.0/instances/barnes/snapshots/backup20230317
- /1.0/instances/barnes/snapshots/backup20230318
- /1.0/instances/barnes/snapshots/backup20230319
- /1.0/instances/barnes/snapshots/backup20230320
- /1.0/instances/barnes/snapshots/backup20230321
- /1.0/instances/barnes/snapshots/backup20230322
- /1.0/instances/barnes/snapshots/backup20230323
- /1.0/instances/barnes/snapshots/backup20230324
- /1.0/instances/barnes/snapshots/backup20230325
- /1.0/instances/barnes/snapshots/backup20230326
- /1.0/instances/barnes/snapshots/backup20230327
- /1.0/instances/barnes/snapshots/backup20230328
- /1.0/instances/barnes/snapshots/backup20230329
- /1.0/instances/bmbbooking
- /1.0/instances/bmbbooking/snapshots/backup20230315
- /1.0/instances/bmbbooking/snapshots/backup20230316
- /1.0/instances/bmbbooking/snapshots/backup20230317
- /1.0/instances/bmbbooking/snapshots/backup20230318
- /1.0/instances/bmbbooking/snapshots/backup20230319
- /1.0/instances/bmbbooking/snapshots/backup20230320
- /1.0/instances/bmbbooking/snapshots/backup20230321
- /1.0/instances/bmbbooking/snapshots/backup20230322
- /1.0/instances/bmbbooking/snapshots/backup20230323
- /1.0/instances/bmbbooking/snapshots/backup20230324
- /1.0/instances/bmbbooking/snapshots/backup20230325
- /1.0/instances/bmbbooking/snapshots/backup20230326
- /1.0/instances/bmbbooking/snapshots/backup20230327
- /1.0/instances/bmbbooking/snapshots/backup20230328
- /1.0/instances/bmbbooking/snapshots/backup20230329
- /1.0/instances/bmbdept
- /1.0/instances/bmbdept/snapshots/backup20221121
- /1.0/instances/bmbdept/snapshots/backup20221122
- /1.0/instances/bmbdept/snapshots/backup20221123
- /1.0/instances/bmbdept/snapshots/backup20221124
- /1.0/instances/bmbdept/snapshots/backup20221125
- /1.0/instances/bmbdept/snapshots/backup20221126
- /1.0/instances/bmbdept/snapshots/backup20221127
- /1.0/instances/bmbdept/snapshots/backup20221128
- /1.0/instances/bmbdept/snapshots/backup20221129
- /1.0/instances/bmbdept/snapshots/backup20221130
- /1.0/instances/bmbdept/snapshots/backup20221201
- /1.0/instances/bmbdept/snapshots/backup20221202
- /1.0/instances/bmbdept/snapshots/backup20221203
- /1.0/instances/bmbdept/snapshots/backup20221204
- /1.0/instances/bmbdept/snapshots/backup20221205
- /1.0/instances/btp
- /1.0/instances/btp/snapshots/backup20230315
- /1.0/instances/btp/snapshots/backup20230316
- /1.0/instances/btp/snapshots/backup20230317
- /1.0/instances/btp/snapshots/backup20230318
- /1.0/instances/btp/snapshots/backup20230319
- /1.0/instances/btp/snapshots/backup20230320
- /1.0/instances/btp/snapshots/backup20230321
- /1.0/instances/btp/snapshots/backup20230322
- /1.0/instances/btp/snapshots/backup20230323
- /1.0/instances/btp/snapshots/backup20230324
- /1.0/instances/btp/snapshots/backup20230325
- /1.0/instances/btp/snapshots/backup20230326
- /1.0/instances/btp/snapshots/backup20230327
- /1.0/instances/btp/snapshots/backup20230328
- /1.0/instances/btp/snapshots/backup20230329
- /1.0/instances/cbi
- /1.0/instances/cbi/snapshots/backup20230315
- /1.0/instances/cbi/snapshots/backup20230316
- /1.0/instances/cbi/snapshots/backup20230317
- /1.0/instances/cbi/snapshots/backup20230318
- /1.0/instances/cbi/snapshots/backup20230319
- /1.0/instances/cbi/snapshots/backup20230320
- /1.0/instances/cbi/snapshots/backup20230321
- /1.0/instances/cbi/snapshots/backup20230322
- /1.0/instances/cbi/snapshots/backup20230323
- /1.0/instances/cbi/snapshots/backup20230324
- /1.0/instances/cbi/snapshots/backup20230325
- /1.0/instances/cbi/snapshots/backup20230326
- /1.0/instances/cbi/snapshots/backup20230327
- /1.0/instances/cbi/snapshots/backup20230328
- /1.0/instances/cbi/snapshots/backup20230329
- /1.0/instances/cbitest
- /1.0/instances/cbitest/snapshots/current
- /1.0/instances/chembooking
- /1.0/instances/chembooking/snapshots/backup20230315
- /1.0/instances/chembooking/snapshots/backup20230316
- /1.0/instances/chembooking/snapshots/backup20230317
- /1.0/instances/chembooking/snapshots/backup20230318
- /1.0/instances/chembooking/snapshots/backup20230319
- /1.0/instances/chembooking/snapshots/backup20230320
- /1.0/instances/chembooking/snapshots/backup20230321
- /1.0/instances/chembooking/snapshots/backup20230322
- /1.0/instances/chembooking/snapshots/backup20230323
- /1.0/instances/chembooking/snapshots/backup20230324
- /1.0/instances/chembooking/snapshots/backup20230325
- /1.0/instances/chembooking/snapshots/backup20230326
- /1.0/instances/chembooking/snapshots/backup20230327
- /1.0/instances/chembooking/snapshots/backup20230328
- /1.0/instances/chembooking/snapshots/backup20230329
- /1.0/instances/chienbrowser
- /1.0/instances/chienbrowser/snapshots/backup20230315
- /1.0/instances/chienbrowser/snapshots/backup20230316
- /1.0/instances/chienbrowser/snapshots/backup20230317
- /1.0/instances/chienbrowser/snapshots/backup20230318
- /1.0/instances/chienbrowser/snapshots/backup20230319
- /1.0/instances/chienbrowser/snapshots/backup20230320
- /1.0/instances/chienbrowser/snapshots/backup20230321
- /1.0/instances/chienbrowser/snapshots/backup20230322
- /1.0/instances/chienbrowser/snapshots/backup20230323
- /1.0/instances/chienbrowser/snapshots/backup20230324
- /1.0/instances/chienbrowser/snapshots/backup20230325
- /1.0/instances/chienbrowser/snapshots/backup20230326
- /1.0/instances/chienbrowser/snapshots/backup20230327
- /1.0/instances/chienbrowser/snapshots/backup20230328
- /1.0/instances/chienbrowser/snapshots/backup20230329
- /1.0/instances/container-2204
- /1.0/instances/container-2204/snapshots/backup20221121
- /1.0/instances/container-2204/snapshots/backup20221122
- /1.0/instances/container-2204/snapshots/backup20221123
- /1.0/instances/container-2204/snapshots/backup20221124
- /1.0/instances/container-2204/snapshots/backup20221125
- /1.0/instances/container-2204/snapshots/backup20221126
- /1.0/instances/container-2204/snapshots/backup20221127
- /1.0/instances/container-2204/snapshots/backup20221128
- /1.0/instances/container-2204/snapshots/backup20221129
- /1.0/instances/container-2204/snapshots/backup20221130
- /1.0/instances/container-2204/snapshots/backup20221201
- /1.0/instances/container-2204/snapshots/backup20221202
- /1.0/instances/container-2204/snapshots/backup20221203
- /1.0/instances/container-2204/snapshots/backup20221204
- /1.0/instances/container-2204/snapshots/backup20221205
- /1.0/instances/cyclone
- /1.0/instances/cyclone/snapshots/current
- /1.0/instances/cyclone/snapshots/now
- /1.0/instances/dokuwiki
- /1.0/instances/dokuwiki/snapshots/backup20230315
- /1.0/instances/dokuwiki/snapshots/backup20230316
- /1.0/instances/dokuwiki/snapshots/backup20230317
- /1.0/instances/dokuwiki/snapshots/backup20230318
- /1.0/instances/dokuwiki/snapshots/backup20230319
- /1.0/instances/dokuwiki/snapshots/backup20230320
- /1.0/instances/dokuwiki/snapshots/backup20230321
- /1.0/instances/dokuwiki/snapshots/backup20230322
- /1.0/instances/dokuwiki/snapshots/backup20230323
- /1.0/instances/dokuwiki/snapshots/backup20230324
- /1.0/instances/dokuwiki/snapshots/backup20230325
- /1.0/instances/dokuwiki/snapshots/backup20230326
- /1.0/instances/dokuwiki/snapshots/backup20230327
- /1.0/instances/dokuwiki/snapshots/backup20230328
- /1.0/instances/dokuwiki/snapshots/backup20230329
- /1.0/instances/duchenelab
- /1.0/instances/duchenelab/snapshots/backup20230315
- /1.0/instances/duchenelab/snapshots/backup20230316
- /1.0/instances/duchenelab/snapshots/backup20230317
- /1.0/instances/duchenelab/snapshots/backup20230318
- /1.0/instances/duchenelab/snapshots/backup20230319
- /1.0/instances/duchenelab/snapshots/backup20230320
- /1.0/instances/duchenelab/snapshots/backup20230321
- /1.0/instances/duchenelab/snapshots/backup20230322
- /1.0/instances/duchenelab/snapshots/backup20230323
- /1.0/instances/duchenelab/snapshots/backup20230324
- /1.0/instances/duchenelab/snapshots/backup20230325
- /1.0/instances/duchenelab/snapshots/backup20230326
- /1.0/instances/duchenelab/snapshots/backup20230327
- /1.0/instances/duchenelab/snapshots/backup20230328
- /1.0/instances/duchenelab/snapshots/backup20230329
- /1.0/instances/eexambooking
- /1.0/instances/eexambooking/snapshots/backup20230315
- /1.0/instances/eexambooking/snapshots/backup20230316
- /1.0/instances/eexambooking/snapshots/backup20230317
- /1.0/instances/eexambooking/snapshots/backup20230318
- /1.0/instances/eexambooking/snapshots/backup20230319
- /1.0/instances/eexambooking/snapshots/backup20230320
- /1.0/instances/eexambooking/snapshots/backup20230321
- /1.0/instances/eexambooking/snapshots/backup20230322
- /1.0/instances/eexambooking/snapshots/backup20230323
- /1.0/instances/eexambooking/snapshots/backup20230324
- /1.0/instances/eexambooking/snapshots/backup20230325
- /1.0/instances/eexambooking/snapshots/backup20230326
- /1.0/instances/eexambooking/snapshots/backup20230327
- /1.0/instances/eexambooking/snapshots/backup20230328
- /1.0/instances/eexambooking/snapshots/backup20230329
- /1.0/instances/elements
- /1.0/instances/elements-dev
- /1.0/instances/elements-dev/snapshots/current
- /1.0/instances/elements/snapshots/backup20230105
- /1.0/instances/elements/snapshots/backup20230106
- /1.0/instances/elements/snapshots/backup20230107
- /1.0/instances/elements/snapshots/backup20230108
- /1.0/instances/elements/snapshots/backup20230109
- /1.0/instances/genchem
- /1.0/instances/genchem/snapshots/current
- /1.0/instances/genchem/snapshots/now
- /1.0/instances/growthchambers
- /1.0/instances/growthchambers/snapshots/current
- /1.0/instances/growthchambers/snapshots/now
- /1.0/instances/hammer
- /1.0/instances/hammer/snapshots/backup20230315
- /1.0/instances/hammer/snapshots/backup20230316
- /1.0/instances/hammer/snapshots/backup20230317
- /1.0/instances/hammer/snapshots/backup20230318
- /1.0/instances/hammer/snapshots/backup20230319
- /1.0/instances/hammer/snapshots/backup20230320
- /1.0/instances/hammer/snapshots/backup20230321
- /1.0/instances/hammer/snapshots/backup20230322
- /1.0/instances/hammer/snapshots/backup20230323
- /1.0/instances/hammer/snapshots/backup20230324
- /1.0/instances/hammer/snapshots/backup20230325
- /1.0/instances/hammer/snapshots/backup20230326
- /1.0/instances/hammer/snapshots/backup20230327
- /1.0/instances/hammer/snapshots/backup20230328
- /1.0/instances/hammer/snapshots/backup20230329
- /1.0/instances/haproxy
- /1.0/instances/haproxy-alice
- /1.0/instances/haproxy/snapshots/current
- /1.0/instances/haproxy/snapshots/now
- /1.0/instances/hardylab
- /1.0/instances/hardylab/snapshots/current
- /1.0/instances/hardylab/snapshots/now
- /1.0/instances/high-pressure
- /1.0/instances/high-pressure/snapshots/current
- /1.0/instances/high-pressure/snapshots/now
- /1.0/instances/idea
- /1.0/instances/idea/snapshots/current
- /1.0/instances/idea/snapshots/now
- /1.0/instances/idea/snapshots/now2
- /1.0/instances/idea/snapshots/now3
- /1.0/instances/idea/snapshots/now4
- /1.0/instances/idea/snapshots/now5
- /1.0/instances/idea/snapshots/pre-modify-token-description-page
- /1.0/instances/isbbooking
- /1.0/instances/isbbooking/snapshots/current
- /1.0/instances/isbbooking/snapshots/now
- /1.0/instances/isbinstruments
- /1.0/instances/isbinstruments/snapshots/current
- /1.0/instances/isbinstruments/snapshots/now
- /1.0/instances/it
- /1.0/instances/it/snapshots/current
- /1.0/instances/it/snapshots/now
- /1.0/instances/itwiki
- /1.0/instances/itwiki/snapshots/current
- /1.0/instances/itwiki/snapshots/now
- /1.0/instances/lecturedemos
- /1.0/instances/lecturedemos/snapshots/backup20230315
- /1.0/instances/lecturedemos/snapshots/backup20230316
- /1.0/instances/lecturedemos/snapshots/backup20230317
- /1.0/instances/lecturedemos/snapshots/backup20230318
- /1.0/instances/lecturedemos/snapshots/backup20230319
- /1.0/instances/lecturedemos/snapshots/backup20230320
- /1.0/instances/lecturedemos/snapshots/backup20230321
- /1.0/instances/lecturedemos/snapshots/backup20230322
- /1.0/instances/lecturedemos/snapshots/backup20230323
- /1.0/instances/lecturedemos/snapshots/backup20230324
- /1.0/instances/lecturedemos/snapshots/backup20230325
- /1.0/instances/lecturedemos/snapshots/backup20230326
- /1.0/instances/lecturedemos/snapshots/backup20230327
- /1.0/instances/lecturedemos/snapshots/backup20230328
- /1.0/instances/lecturedemos/snapshots/backup20230329
- /1.0/instances/martinlab
- /1.0/instances/martinlab/snapshots/current
- /1.0/instances/martinlab/snapshots/now
- /1.0/instances/people
- /1.0/instances/people/snapshots/current
- /1.0/instances/people/snapshots/now
- /1.0/instances/pitemp
- /1.0/instances/pitemp/snapshots/backup20230315
- /1.0/instances/pitemp/snapshots/backup20230316
- /1.0/instances/pitemp/snapshots/backup20230317
- /1.0/instances/pitemp/snapshots/backup20230318
- /1.0/instances/pitemp/snapshots/backup20230319
- /1.0/instances/pitemp/snapshots/backup20230320
- /1.0/instances/pitemp/snapshots/backup20230321
- /1.0/instances/pitemp/snapshots/backup20230322
- /1.0/instances/pitemp/snapshots/backup20230323
- /1.0/instances/pitemp/snapshots/backup20230324
- /1.0/instances/pitemp/snapshots/backup20230325
- /1.0/instances/pitemp/snapshots/backup20230326
- /1.0/instances/pitemp/snapshots/backup20230327
- /1.0/instances/pitemp/snapshots/backup20230328
- /1.0/instances/pitemp/snapshots/backup20230329
- /1.0/instances/redirected-sites
- /1.0/instances/redirected-sites/snapshots/current
- /1.0/instances/redirected-sites/snapshots/now
- /1.0/instances/rt4-3-3
- /1.0/instances/rt4-3-3/snapshots/backup20230315
- /1.0/instances/rt4-3-3/snapshots/backup20230316
- /1.0/instances/rt4-3-3/snapshots/backup20230317
- /1.0/instances/rt4-3-3/snapshots/backup20230318
- /1.0/instances/rt4-3-3/snapshots/backup20230319
- /1.0/instances/rt4-3-3/snapshots/backup20230320
- /1.0/instances/rt4-3-3/snapshots/backup20230321
- /1.0/instances/rt4-3-3/snapshots/backup20230322
- /1.0/instances/rt4-3-3/snapshots/backup20230323
- /1.0/instances/rt4-3-3/snapshots/backup20230324
- /1.0/instances/rt4-3-3/snapshots/backup20230325
- /1.0/instances/rt4-3-3/snapshots/backup20230326
- /1.0/instances/rt4-3-3/snapshots/backup20230327
- /1.0/instances/rt4-3-3/snapshots/backup20230328
- /1.0/instances/rt4-3-3/snapshots/backup20230329
- /1.0/instances/samson
- /1.0/instances/samson/snapshots/backup20230315
- /1.0/instances/samson/snapshots/backup20230316
- /1.0/instances/samson/snapshots/backup20230317
- /1.0/instances/samson/snapshots/backup20230318
- /1.0/instances/samson/snapshots/backup20230319
- /1.0/instances/samson/snapshots/backup20230320
- /1.0/instances/samson/snapshots/backup20230321
- /1.0/instances/samson/snapshots/backup20230322
- /1.0/instances/samson/snapshots/backup20230323
- /1.0/instances/samson/snapshots/backup20230324
- /1.0/instances/samson/snapshots/backup20230325
- /1.0/instances/samson/snapshots/backup20230326
- /1.0/instances/samson/snapshots/backup20230327
- /1.0/instances/samson/snapshots/backup20230328
- /1.0/instances/samson/snapshots/backup20230329
- /1.0/instances/sites
- /1.0/instances/sites/snapshots/current
- /1.0/instances/sites/snapshots/now
- /1.0/instances/skouta
- /1.0/instances/skouta/snapshots/current
- /1.0/instances/skouta/snapshots/now
- /1.0/instances/walshsrv
- /1.0/instances/walshsrv/snapshots/backup20230315
- /1.0/instances/walshsrv/snapshots/backup20230316
- /1.0/instances/walshsrv/snapshots/backup20230317
- /1.0/instances/walshsrv/snapshots/backup20230318
- /1.0/instances/walshsrv/snapshots/backup20230319
- /1.0/instances/walshsrv/snapshots/backup20230320
- /1.0/instances/walshsrv/snapshots/backup20230321
- /1.0/instances/walshsrv/snapshots/backup20230322
- /1.0/instances/walshsrv/snapshots/backup20230323
- /1.0/instances/walshsrv/snapshots/backup20230324
- /1.0/instances/walshsrv/snapshots/backup20230325
- /1.0/instances/walshsrv/snapshots/backup20230326
- /1.0/instances/walshsrv/snapshots/backup20230327
- /1.0/instances/walshsrv/snapshots/backup20230328
- /1.0/instances/walshsrv/snapshots/backup20230329
- /1.0/instances/welab
- /1.0/instances/welab/snapshots/current
- /1.0/instances/welab/snapshots/now
- /1.0/instances/wptest
- /1.0/instances/wptest/snapshots/current
- /1.0/instances/wptest/snapshots/now
- /1.0/profiles/default
status: Created
locations:
- none
tomp
(Thomas Parrott)
March 29, 2023, 1:01pm
10
What happens if you delete the instance on the target using lxc delete <instance>
and then re-run lxc copy --refresh
multiple times?
johnmaher
(John Maher)
March 29, 2023, 1:08pm
11
Huh, it works fine.
Target:
$ lxc delete argus
Source:
$ lxc copy --refresh argus trixie:argus
$ lxc copy --refresh argus trixie:argus
$
Target:
$ lxc list argus
+-------+---------+------+------+-----------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+-------+---------+------+------+-----------+-----------+
| argus | STOPPED | | | CONTAINER | 2 |
+-------+---------+------+------+-----------+-----------+
Should I have run lxc copy --refresh argus trixie:argus
to start instead of lxc copy argus trixie:argus
?
1 Like
tomp
(Thomas Parrott)
March 29, 2023, 1:17pm
12
Can you delete it and try again using no --refresh
initially and then subsequently using --refresh
to see. It may be that a bug has been fixed in the current snap channel.
johnmaher
(John Maher)
March 29, 2023, 1:26pm
13
Not so good.
Target:
$ lxc delete argus
Source:
$ lxc snapshot argus now2
$ lxc copy argus/now2 trixie:argus
$ lxc copy --refresh argus trixie:argus
Error: Failed instance creation: Error transferring instance data: Failed creating instance on target: Failed to run: btrfs receive -e /var/snap/lxd/common/lxd/storage-pools/default/containers/migration.1822080087/pre-nagios-install: exit status 1 (ERROR: cannot find parent subvolume)
tomp
(Thomas Parrott)
March 29, 2023, 1:34pm
14
Thats copying a snapshot, followed by a refresh, which should work, but isn’t the same as doing:
lxc copy argus trixie:argus
lxc copy --refresh argus trixie:argus
Which should be equivalent to doing:
lxc copy --refresh argus trixie:argus
lxc copy --refresh argus trixie:argus
Lets confirm one thing works at a time
tomp
(Thomas Parrott)
March 29, 2023, 1:40pm
15
Also, I’m not sure what you’re intention is with:
lxc copy argus/now2 trixie:argus
lxc copy --refresh argus trixie:argus
But I’m not sure it’ll do what you perhaps think it will. It will create a new instance from the snapshot on trixie, called argus, and then the refresh should then delete that instance and then transfer the snapshot(s) and the instance from the source to trixie.
It maybe that this will work more efficiently in later releases of LXD 5.0.x when/if this gets backported:
lxc:master
← monstermunchkin:misc/rsync-refresh
opened 08:24PM - 16 Mar 23 UTC
So that it uses rsync to only sync the differences between the instance created from the snapshot on trixie, and the later source instance.
Although I’m still not sure, because the source instance has snapshots, it won’t just delete everything on the target and resync using the optimized transfer mode supported by BTRFS.
Perhaps doing lxc copy --refresh --instance-only argus trixie:argus
would work in that situation to use rsync (if running a version of LXD with https://github.com/lxc/lxd/pull/11479 ).
If you want to benefit from snapshots for reducing --refresh time when using an optimized storage pool (BTRFS or ZFS) then you should just do:
lxc snapshot argus
lxc copy --refresh argus trixie:argus
lxc snapshot argus
lxc copy --refresh argus trixie:argus
So only the differences between each snapshot are sent.
tomp
(Thomas Parrott)
March 29, 2023, 1:41pm
16
It would also be worth checking this behaviour when using LXD from latest/stable
channel on both sides (use a fresh setup for this so you don’t prevent downgrading back to the 5.0 LTS series), as if that error still occurs its a bug.
johnmaher
(John Maher)
March 29, 2023, 1:55pm
17
A lot for me to unpack here, thank you.
I tried this and it didn’t go well. What is CRIU, and how do I install it?
Target:
$ lxc delete argus
Source:
$ lxc copy argus trixie:argus
Error: Unable to perform live container migration. CRIU isn't installed on the source server. To migrate the container, stop the container before migration or install CRIU on the source server
tomp
(Thomas Parrott)
March 29, 2023, 2:02pm
18
CRIU is for live (stateful) migration for containers, although it is very limited.
Does lxc copy argus trixie:argus --stateless
work?
You may also want to add --allow-inconsistent
to avoid any attempt to freeze the instance when doing a copy.
johnmaher
(John Maher)
March 29, 2023, 2:09pm
19
Yes! I think this is going to work. I’ll study your previous comments, but I think I can establish a reliable backup server now.
Thanks again, @tomp . I may have to revisit this post and ask a question or two, but I think I’m in good shape. Thanks.
1 Like