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This manual is an extension of our general Checkmk backup article: https://docs.checkmk.com/master/en/backup.html Checkmk Backups

Status

colour	Green
title	LAST TESTED ON CHECKMK 2.03.0P1

Panel

borderColor	black
bgColor	#f8f8f8
title	Table of Contents

Table of Contents

Problem

Basic information about mkbackup

After configuring the backup job in Webconf, a cronjob is created. This job can be inspected on the command line, after logging in via SSH as site user:

...

Code Block

language	bash
theme	RDark

OMD[cma]:~$ mkbackup --verbose --debug backup mybackup

Collection of error messages

Failed to perform a backup: [Errno 104] Connection reset by peer

Code Block

language	bash
theme	RDark

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

Solution

Find the correct backup job

...

Here it looks like Checkmk is using pnp4nagios instead of Round Robin Database (RRD). We recommend converting the performance data to the RRD format. Please follow the steps described here: https://docs.checkmk.com/latest/en/graphing.html#customise_rrds Customizing the RRD structure

Don't forget to stop the site before converting the files!

...

Now the backup should run without any errors.

UnicodeEncodeError: 'utf-8' codec can't encode character '\udcc3' in position 122: surrogates not allowed

Code Block

language	bash
theme	RDark

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.

...

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.

Code Block

language	bash
theme	RDark

OMD[mysite]:~$ mv oldfilename newfilename

Versions Compared

Old Version 36

New Version Current

Key

Problem

Basic information about mkbackup

Collection of error messages

Failed to perform a backup: [Errno 104] Connection reset by peer

Solution

UnicodeEncodeError: 'utf-8' codec can't encode character '\udcc3' in position 122: surrogates not allowed

Solution

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