backing up xfs on centos7

usao · 06-26-2017, 09:19 PM

Having trouble specifying a remote dump file...

Code:

[root@centos7~]# ssh backup touch /backup/centos7/centos7.boot.2017-06-26.L0.xfsdump.tmp
[root@centos7~]# /usr/sbin/xfsdump -l 0 -f backup:/backup/centos7/centos7.boot.2017-06-26.L0.xfsdump.tmp /boot
sh: /usr/bin/rsh: No such file or directory
WARNING: rmtopen: failed to detect remote host type reading "/usr/bin/rsh backup uname"
librmt: problem finding either RSH(/usr/bin/rsh) or RMT(/etc/rmt): No such file or directory
xfsdump: mlog.c:774: mlog_exit_flush: Assertion `((mlog_main_exit_code) == 0 || (mlog_main_exit_code) == 1 || (mlog_main_exit_code) == 2 || (mlog_main_exit_code) == 4)' failed.
/usr/sbin/xfsdump: using file dump (drive_simple) strategy
sh: /usr/bin/rsh: No such file or directory
WARNING: rmtopen: failed to detect remote host type reading "/usr/bin/rsh backup uname"
*** buffer overflow detected ***: /usr/sbin/xfsdump terminated
======= Backtrace: =========

jefro · 06-26-2017, 10:11 PM

Seems you are trying to do it over a network. This fails first. "sh: /usr/bin/rsh:"

Start there. Might be some problems if this is NFS too.

http://forums.nekochan.net/viewtopic.php?t=16725078

usao · 06-27-2017, 09:39 AM

I installed 'rsh', and still get the following error.
1) I can ping the 'backup' server just fine.
2) Why is it using 'rmt' commands, this is a dump to a file in a remote host, not a tape drive.

Code:

[root@centos7 ~]# /usr/sbin/xfsdump -l 0 -f backup:/backup/centos7/centos7.boot.2017-06-27.L0.xfsdump.tmp /boot
backup: No route to host
WARNING: rmtopen: failed to detect remote host type reading "/usr/bin/rsh backup uname"
backup: No route to host
/usr/sbin/xfsdump: using file dump (drive_simple) strategy
backup: No route to host
WARNING: rmtopen: failed to detect remote host type reading "/usr/bin/rsh backup uname"
*** buffer overflow detected ***: /usr/sbin/xfsdump terminated

[root@centos7 ~]# ping backup
PING backup (10.0.0.254) 56(84) bytes of data.
64 bytes from backup (10.0.0.254): icmp_seq=1 ttl=64 time=0.248 ms
64 bytes from backup (10.0.0.254): icmp_seq=2 ttl=64 time=0.395 ms

michaelk · 06-27-2017, 10:00 AM

I assume the linux verion of xfsdump is the same as the unix version. It appears the remote file has to be in the /dev directory. Alternative methods would be to use nfs or a pipe.

http://docs.cray.com/books/S-2311-22...g2wmwkw45.html

usao · 06-27-2017, 10:22 AM

Yes, xfsdump is installed by 'yum' to match the current OS version.
I tried dumping to stdout but it's aparently not supported:

Code:

[root@centos7 ~]# /usr/sbin/xfsdump -l 0 -f - /boot | ssh backup "dd of=/backup/centos7/centos7.boot.2017-06-27.L0.xfsdump.tmp"
/usr/sbin/xfsdump: usage: xfsdump [ -a (dump DMF dualstate files as offline) ]
                                  [ -b <blocksize> ]
                                  [ -c <media change alert program>  ]
                                  [ -d <dump media file size>  ]
                                  [ -e (allow files to be excluded) ]
                                  [ -f <destination> ... ]
                                  [ -h (help) ]
                                  [ -l <level> ]
                                  [ -m (force usage of minimal rmt) ]
                                  [ -o (overwrite tape) ]
                                  [ -p <seconds between progress reports> ]
                                  [ -q <use QIC tape settings> ]
                                  [ -s <subtree> ... ]
                                  [ -t <file> (use file mtime for dump time ]
                                  [ -v <verbosity {silent, verbose, trace}> ]
                                  [ -z <maximum file size> ]
                                  [ -A (don't dump extended file attributes) ]
                                  [ -B <base dump session id> ]
                                  [ -D (skip unchanged directories) ]
                                  [ -E (pre-erase media) ]
                                  [ -F (don't prompt) ]
                                  [ -I (display dump inventory) ]
                                  [ -J (inhibit inventory update) ]
                                  [ -K (generate format 2 dump) ]
                                  [ -L <session label> ]
                                  [ -M <media label> ... ]
                                  [ -O <options file> ]
                                  [ -R (resume) ]
                                  [ -T (don't timeout dialogs) ]
                                  [ -Y <I/O buffer ring length> ]
                                  [ - (stdout) ]
                                  [ <source (mntpnt|device)> ]

michaelk · 06-27-2017, 10:32 AM

For stdout you do not specify the -f option. Untested but try this:

Code:

/usr/sbin/xfsdump -l 0 - /boot | ssh backup "cat - > /backup/centos7/centos7.boot.2017-06-27.L0.xfsdump.tmp"

usao · 06-27-2017, 10:56 AM

That seems to work.
Next question... Is there a way to make xfsdump avoid spanning filesystems (sub directories which are mount points)?

michaelk · 06-27-2017, 11:16 AM

My xfsdump knowledge is very limited... The -s option is used to exclude files and directories but not sure of its exact syntax.