389 fails to start, libdb: BDB1546 unable to join the environment

["Zarko D" <zarko@xxxxxxxxxxxx>]

Hi there, this is 389-ds-base-1.3.5.10-11 (part of  ipa-server-4.4.0-12.0.1) and suddenly daily backup has started to fail with messages: 

2019-01-28T04:10:04Z INFO Backing up ipaca in REALM-COM to LDIF
2019-01-28T04:10:04Z INFO Waiting for LDIF to finish
2019-01-28T04:10:05Z DEBUG   File "/usr/lib/python2.7/site-packages/ipapython/admintool.py", line 171, in execute
    return_value = self.run()
  File "/usr/lib/python2.7/site-packages/ipaserver/install/ipa_backup.py", line 300, in run
    self.db2ldif(instance, 'ipaca', online=options.online)
  File "/usr/lib/python2.7/site-packages/ipaserver/install/ipa_backup.py", line 425, in db2ldif
    shutil.move(ldiffile, os.path.join(self.dir, ldifname))
  File "/usr/lib64/python2.7/shutil.py", line 301, in move
    copy2(src, real_dst)
  File "/usr/lib64/python2.7/shutil.py", line 130, in copy2
    copyfile(src, dst)
  File "/usr/lib64/python2.7/shutil.py", line 82, in copyfile
    with open(src, 'rb') as fsrc:
2019-01-28T04:10:05Z DEBUG The ipa-backup command failed, exception: IOError: [Errno 2] No such file or directory: u'/var/
lib/dirsrv/slapd-REALM-COM/ldif/REALM-COM-ipaca.ldif'
2019-01-28T04:10:05Z ERROR [Errno 2] No such file or directory: u'/var/lib/dirsrv/slapd-REALM-COM/ldif/REALM-COM-ipaca.ldif'
2019-01-28T04:10:05Z ERROR The ipa-backup command failed. See /var/log/ipabackup.log for more information

And service start fails with messages: 

[02/Feb/2019:22:47:37.889779410 -0800] 389-Directory/1.3.5.10 B2016.309.1527 starting up
[02/Feb/2019:22:47:37.906422534 -0800] default_mr_indexer_create: warning - plugin [caseIgnoreIA5Match] does not handle caseExactIA5Match
[02/Feb/2019:22:47:37.921288555 -0800] WARNING: userRoot: entry cache size 10485760 B is less than db size 16932864 B; We recommend to increase the entry cache size nsslapd-cachememsize.
[02/Feb/2019:22:47:37.921943984 -0800] WARNING: ipaca: entry cache size 10485760 B is less than db size 1757741056 B; We recommend to increase the entry cache size nsslapd-cachememsize.
[02/Feb/2019:22:47:37.922701343 -0800] WARNING: changelog: entry cache size 2097152 B is less than db size 82935808 B; We recommend to increase the entry cache size nsslapd-cachememsize.
[02/Feb/2019:22:47:37.925215059 -0800] Detected Disorderly Shutdown last time Directory Server was running, recovering database.
[02/Feb/2019:22:47:37.926177620 -0800] libdb: BDB1546 unable to join the environment


thanks in advance for any help, Zarko
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