Hi,
I am having problems with BackupPC on Solaris10. I have been searching on
Google, the forums and the Wikis for help, but could find no solution. Any help
from someone in this forum is greatly appreciated.
I have been using BackupPC 2.1.2pl1 on Debian/Linux for some time now and it
works like a charm. For several reasons that go beyond this post I am now
forced to run BackupPC on Solaris10. However, there are some problems with
rsync/ssh.
I am trying to run BackupPC 3.20 on Solaris10 on host 'backuppc2' to backup a
client named 'forbin' which is a Ubuntu/Linux 904.
Root login on the client works fine for the backuppc user via ssh-keys, no
password is required, no ssh-agent is running, no SSH-Variables are set:
backuppc@backuppc2 />/opt/csw/bin/ssh root@forbin whoami
root
But if I run BackupPC_dump via command line it is stuck at some point:
backuppc@backuppc2 />/usr/local/BackupPC/bin/BackupPC_dump -fv forbin
cmdSystemOrEval: about to system /usr/sbin/ping -s forbin 56 1
[... ping output]
CheckHostAlive: returning 0.251
full backup started for directory / (baseline backup #0)
started full dump, share=/
Running: /opt/csw/bin/ssh -c blowfish -q -x -l root -o
PreferredAuthentications=publickey forbin /usr/bin/rsync --server --sender
--checksum-seed=32761 --numeric-ids --perms --owner --group -D --links --times
--block-size=2048 --recursive --ignore-times . /
Xfer PIDs are now 9634
xferPids 9634
Got remote protocol 30
Negotiated protocol version 28
Nothing will happen from this point onward.
*However*, if I press the return key 4 times, output continues:
Sent include: /etc
Sent include: /root
Sent include: /local
Sent include: /local/mysql
Sent include: /local/mysql/mysql
Sent include: /local/mysql/give_et
Sent exclude: /*
Sent exclude: /local/*
Sent exclude: /local/mysql/*
Read EOF:
Tried again: got 0 bytes
fileListReceive() failed
Done: 0 files, 0 bytes
Got fatal error during xfer (fileListReceive failed)
I do _not_ believe this is ssh waiting for a password! Why would it take
exactly 4 input characters?
It looks to me like the rsync/ssh pipe is broken in some way, like ssh is
trying to read its input not from the rsync, but from STDIN from the command
line. If I add a '-n' to the ssh options (redirects stdin from /dev/null) the
BackupPC_dump fails quicker, without and keyboard input:
full backup started for directory / (baseline backup #0)
started full dump, share=/
Running: /opt/csw/bin/ssh -n -c blowfish -q -x -l root -o
PreferredAuthentications=publickey forbin /usr/bin/rsync --server --sender
--checksum-seed=32761 --numeric-ids --perms --owner --group -D --links --times
--block-size=2048 --recursive --ignore-times . /
Xfer PIDs are now 9668
xferPids 9668
Got remote protocol 30
Negotiated protocol version 28
Sent include: /etc
Sent include: /root
Sent include: /local
Sent include: /local/mysql
Sent include: /local/mysql/mysql
Sent include: /local/mysql/give_et
Sent exclude: /*
Sent exclude: /local/*
Sent exclude: /local/mysql/*
Read EOF:
Tried again: got 0 bytes
fileListReceive() failed
Done: 0 files, 0 bytes
Got fatal error during xfer (fileListReceive failed)
I tried looking into the problem via truss, the strace equivalent of Solaris.
In the truss output I can see rsync on the backup client sends 4 bytes that
look like the rsync protocol version: 0x1e 0x0 0x0 0x0. The same goes for the
backuppc side where the rsync process sends 4 bytes as well that look like the
rsync protocol version: 0x1c 0x0 0x0 0x0. However, communication from the the
backuppc rsync just does not go on until I sent 4 characters via keyboard, jsut
like I am supplying the 4 byte rsync version via keyboard to the ssh pipe to
the backup client. I tried disabling pseudo-tty allocation via ssh -T, buit
the result is the same.
What I do not quite understand is why keyboard input is having any effect at
all? In my opinion rsync/ssh communicate directly via some pipe/fifo.
Does anybody have an explanation for this?
These are the versions in use:
Client (always worked fine with BackupPC 2.1.2pl1 on Debian/Linux)
Ubuntu/Linux 904
rsync 3.0.5 protocol version 30
ssh OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007
Server:
BackupPC 3.20
/opt/csw/bin/ssh OpenSSH_5.3p1, OpenSSL 0.9.8p 16 Nov 2010
/bin/ssh Sun_SSH_1.1.4, SSH protocols 1.5/2.0, OpenSSL 0x0090704f (same result
as /opt/csw/bin/ssh)
Perl File::RsyncP 0.70
/opt/csw/bin/rsync 3.0.6 protocol version 30 (not sure if this is used at all)
Any help or pointers are greatly appreciated!
Chris
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