An UCS master records each transaction done by the univention-directory-notifier. In larger environments with a high count of LDAP changes, the size grows steadily.
Possible footnotes can be:
- The join of new UCS systems is slow.
- The start of the univention-directory-notifier daemon may be slow.
If each system in the domain is (mostly) at the same replication level (see UCS manual: Analysis of listener/notifier problems for further analysis in doubt) you can safely downsize the transaction file by keeping only a certain amount of transactions.
Note: If you want to clean your transactions from a certain point in time, check this article
To cleanup everything but keeping the last 10000 entries you may use these steps at the DC Master:
root@ucs:~# tail -n 10000 /var/lib/univention-ldap/notify/transaction | head -n1 80802 relativeDomainName=ucs-sso,zoneName=domain.tld,cn=dns,dc=domain,dc=tld m # /usr/share/univention-directory-notifier/univention-translog [-v] prune <TID> root@ucs:~# /usr/share/univention-directory-notifier/univention-translog -v prune 80802 2019-07-15 12:44:06,103:INFO:Index of size 818018 contains 90802 entries 2019-07-15 12:44:06,104:INFO:Purging/keeping 1..80802..90802 2019-07-15 12:44:06,169:INFO:Deleted reqSession=1,cn=translog 2019-07-15 12:44:06,170:INFO:Deleted reqSession=2,cn=translog ... 2019-07-15 12:48:22,100:INFO:Deleted reqSession=80800,cn=translog 2019-07-15 12:48:22,101:INFO:Deleted reqSession=80801,cn=translog
Optionally, after that the free pages can be cleaned up. But technically that’s not required and the necessity should be considered in relation to downtime. Anyway these would be the steps:
root@ucs:~# mkdir /var/lib/univention-ldap/translog-new root@ucs:~# systemctl stop univention-directory-notifier.service root@ucs:~# systemctl stop slapd.service root@ucs:~# mdb_copy -c /var/lib/univention-ldap/translog /var/lib/univention-ldap/translog-new root@ucs:~# mv /var/lib/univention-ldap/translog /var/lib/univention-ldap/translog-old root@ucs:~# mv /var/lib/univention-ldap/translog-new /var/lib/univention-ldap/translog root@ucs:~# systemctl start slapd.service root@ucs:~# systemctl start univention-directory-notifier.service
Recheck with nagios the space is freed