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During a device backup on the Checkmk, it may fail. In this guidance, we show you some error messages and how to solve this |
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Problem
Basic information about mkbackup
The This manual here is a more detailed version is an extension of our general Checkmk backup utilityarticle: https://docs.checkmk.com/master/en/backup.html
After configuring the backup job in Webconf, a cronjob is created here. So you can grab the command and execute it via the command lineThis job can be inspected on the command line, after logging in via SSH as site user:
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OMD[mysite]:~$ cat etc/cron.d/mkbackup # Written by mkbackup configuration 0 0 * * * mkbackup backup mybackup >/dev/null OMD[cmamysite]:~$ mkbackup backup hmybackup 2022-05-17 16:02:22 --- Starting backup (Check_MK-cma-cmamysite-hmybackup to thanosmytarget) --- 2022-05-17 16:02:24 Verifying backup consistency 2022-05-17 16:02:24 Cleaning up previously completed backup 2022-05-17 16:02:24 --- Backup completed (Duration: 0:00:01, Size: 7942.6000 MB, IO: 0.0042 B/s) --- OMD[cmamysite]:~$ |
If you need more debugging, you can add --verbose and --debug to the mkbackup command:
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OMD[cma]:~$ mkbackup --verbose --debug backup mybackup |
Collection of error messages
Failed to perform a backup: [Errno 104] Connection reset by peer
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2021-03-17 11:10:20 --- Starting backup (Check_MK_Appliance-test+stage+106-nfs+backup+appliance to nfs-backup-appliance) --- 2021-03-17 11:10:20 Performing system backup (system.tar) 2021-03-17 11:10:25 Performing system data backup (system-data.tar) 2021-03-17 11:10:48 Performing site backup: test Site backup failed: Failed to perform backup: [Errno 104] Connection reset by peer |
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Here it looks like Checkmk is using pnp4nagios instead of RRD. We recommend converting the performance Data data to the rrd RRD format. Please follow the steps described here: https://docs.checkmk.com/latest/en/graphing.html#customise_rrds
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Now the backup should run without any errors.
UnicodeEncodeError: 'utf-8' codec can't encode character '\udcc3' in position 122: surrogates not allowed
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Job state: Site mysite Backup
#############################################
Site backup
State Failed
Runtime Started at 2022-06-21 03:00:02, Finished at 2022-06-21 03:00:02 (Duration: 0:16:36)
Output
2022-06-21 03:00:02 — Starting backup (Check_MK-mysite+cmk2-mysite-mysite+bak to Reload) —
2022-06-21 03:00:02 Found previous incomplete backup. Cleaning up those files.
Site backup failed: Traceback (most recent call last):
File "/omd/sites/mysite/bin/omd", line 60, in <module>
omdlib.main.main()
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/main.py", line 4022, in main
command.handler(version_info, site, global_opts, args, command_options)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/main.py", line 2753, in main_backup
omdlib.backup.backup_site_to_tarfile(site, fh, tar_mode, options, global_opts.verbose)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 54, in backup_site_to_tarfile
_backup_site_files_to_tarfile(site, tar, options)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 112, in _backup_site_files_to_tarfile
tar.add(site.dir, site.name, filter=filter_files)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1977, in add
self.add(os.path.join(name, f), os.path.join(arcname, f),
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 134, in add
super(BackupTarFile, self).add(name, arcname, recursive, filter=filter)
File "/omd/versions/2.0.0p23.cee/lib/python3.8/tarfile.py", line 1971, in add
self.addfile(tarinfo, f)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 158, in addfile
self._suspend_rrd_update(rrd_file_path)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 169, in _suspend_rrd_update
self._send_rrdcached_command("SUSPEND %s" % path)
File "/omd/versions/2.0.0p23.cee/lib/python3/omdlib/backup.py", line 199, in _send_rrdcached_command
self._sock.sendall(("%s\n" % cmd).encode("utf-8"))
UnicodeEncodeError: 'utf-8' codec can't encode character '\udcc3' in position 122: surrogates not allowed |
Solution
Please run the backup directly on the command line and forward the output to a log file.
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This issue is that this file contains a non-ascii character at the end. "AUTORIT�.rrd"
To correct this, we must delete or rename this file. The safest solution would be to rename it.
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OMD[mysite]:~$ mv oldfilename newfilename |
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