[LU-9751] ZFS snapshot doesn't work when using RSH

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Affects Version/s: Lustre 2.10.0
• Severity: 3
• Assignee: nasf (Inactive)
• Reporter: Sarah Liu

Description

build: b2_10 #2 tag-RC1

When testing the ZFS Snapshot with Subdir Mount, I found that the lctl snapshot_* command only works with ssh, with rsh, it returns error. I have tried with both snapshot_create and list, both return the same error.

with ssh:

[root@onyx-69 ~]# lctl snapshot_list -d -F lustre --name test-snap
Password: 

filesystem_name: lustre
snapshot_name: test-snap

snapshot_role: MDT0000
Password: 
modify_time: Fri Jul  7 21:26:41 2017
create_time: Fri Jul  7 21:26:41 2017
snapshot_fsname: 55284e9 
Password: 
status: not mount

snapshot_role: OST0000
modify_time: Fri Jul  7 21:26:41 2017
create_time: Fri Jul  7 21:26:41 2017
snapshot_fsname: 55284e9 
status: not mount

try with same environment but with rsh option

[root@onyx-69 ~]# lctl snapshot_list -d -F lustre --name test-snap -r rsh
bash: zfs: command not found
Can't list the snapshot test-snap
[root@onyx-69 ~]# 

The rsh did work between nodes.

[root@onyx-69 ~]# rsh onyx-70
Last login: Fri Jul  7 21:26:07 from onyx-69.onyx.hpdd.intel.com
[root@onyx-70 ~]#

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/27999/
Subject: LU-9751 snapshot: set PATH for remote zfs commands
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 13fa5f46bff31d6836409383733f817989cca59d

[Sarah Liu]

#8 works! Verified with rsh, ssh and default with no problem.

[nasf (Inactive)]

updated the patch as set 8, and simply tested it on onyx-69/70.

[Sarah Liu]

Here is the problem of patch #7

1. with rsh, snapshot_create return error message but it did create the snapshot;
2. snapshot_list/destroy with rsh still don't work

[root@onyx-69 ~]# lctl snapshot_destroy -F lustre -n test
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test
cannot open 'lustre-mdt1/mdt1@test': dataset does not exist
Can't list the snapshot test
[root@onyx-69 ~]# lctl snapshot_create -F lustre -n test -r rsh
bash: zfs: command not found
bash: zfs: command not found
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test

filesystem_name: lustre
snapshot_name: test
snapshot_fsname: 0cb2593 
modify_time: Thu Jul 20 22:14:52 2017
create_time: Thu Jul 20 22:14:52 2017
status: not mount
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test -r rsh
bash: zfs: command not found
Can't list the snapshot test
[root@onyx-69 ~]# lctl snapshot_destroy -F lustre -n test -r rsh
bash: zfs: command not found
Can't destroy the snapshot test
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test -r ssh

filesystem_name: lustre
snapshot_name: test
snapshot_fsname: 0cb2593 
modify_time: Thu Jul 20 22:14:52 2017
create_time: Thu Jul 20 22:14:52 2017
status: not mount
[root@onyx-69 ~]# lctl snapshot_destroy -F lustre -n test -r ssh
[root@onyx-69 ~]# 

[nasf (Inactive)]

Update as Sarah suggested (set 7)

[Sarah Liu]

can the PATH set to include both? I got following error..

[root@onyx-69 ~]# lctl snapshot_create -F lustre -n test -r rsh
sh: rsh: command not found
sh: rsh: command not found
Can't create the snapshot test
[root@onyx-69 ~]# lctl snapshot_create -F lustre -n test -r ssh
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test -r ssh

filesystem_name: lustre
snapshot_name: test
snapshot_fsname: 5aa1a00 
modify_time: Wed Jul 19 23:05:29 2017
create_time: Wed Jul 19 23:05:29 2017
status: not mount
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test -r rsh
sh: rsh: command not found
Can't list the snapshot test
[root@onyx-69 ~]# 

[nasf (Inactive)]

Sorry, the "PATH" should be set for "zfs/zpool", not for "rsh/ssh". I updated the patch (set 6).

[Sarah Liu]

the rsh still doesn't work, the same error as before

[root@onyx-69 ~]# lctl snapshot_create -F lustre -n test -r ssh
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test -r rsh
bash: zfs: command not found
Can't list the snapshot test
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test

filesystem_name: lustre
snapshot_name: test
modify_time: Tue Jul 18 17:38:29 2017
snapshot_fsname: 19d3a51 
create_time: Tue Jul 18 17:38:29 2017
status: not mount

[nasf (Inactive)]

Sorry Sarah, it is my typo. I have updated the patch set 5

[Sarah Liu]

doesn't work

[root@onyx-69 ~]# lctl snapshot_create -F lustre -n test -r ssh
Miss MDT0 in the config file /etc/ldev.conf
[root@onyx-69 ~]# lctl snapshot_create -F lustre -n test
Miss MDT0 in the config file /etc/ldev.conf
[root@onyx-69 ~]# cat /etc/ldev.conf 
# example /etc/ldev.conf
#
#local  foreign/-  label       [md|zfs:]device-path   [journal-path]/- [raidtab]
#
#zeno-mds1 - zeno-MDT0000 zfs:lustre-zeno-mds1/mdt1
onyx-69 - lustre-MDT0000 zfs:lustre-mdt1/mdt1
#
#zeno1 zeno5 zeno-OST0000 zfs:lustre-zeno1/ost1
onyx-70 - lustre-OST0000 zfs:lustre-ost1/ost1
#zeno2 zeno6 zeno-OST0001 zfs:lustre-zeno2/ost1
#zeno3 zeno7 zeno-OST0002 zfs:lustre-zeno3/ost1
#zeno4 zeno8 zeno-OST0003 zfs:lustre-zeno4/ost1
#zeno5 zeno1 zeno-OST0004 zfs:lustre-zeno5/ost1
#zeno6 zeno2 zeno-OST0005 zfs:lustre-zeno6/ost1
#zeno7 zeno3 zeno-OST0006 zfs:lustre-zeno7/ost1
#zeno8 zeno4 zeno-OST0007 zfs:lustre-zeno8/ost1
[root@onyx-69 ~]# ls /proc/fs/lustre/osd-zfs/
lustre-MDT0000
[root@onyx-69 ~]# lctl snapshot_create -F lustre -n test -r rsh
Miss MDT0 in the config file /etc/ldev.conf
[root@onyx-69 ~]# 

[nasf (Inactive)]

The patch has been updated, please try again. Thanks!