Public bug reported:

Kerbeross5 with LDAP backed and GSSAPI connectivity fails due the
Apparmor profile for slapd that doesn't include possibility to give read
and lock rights to slapd process.

Error on kern.log:

Jul  1 20:20:12 auth kernel: [  875.743303] audit: type=1400
audit(1625160012.372:1191): apparmor="DENIED" operation="file_lock"
profile="/usr/sbin/slapd" name="/var/tmp/krb5_130.rcache2" pid=1559
comm="slapd" requested_mask="k" denied_mask="k" fsuid=130 ouid=130

This kerberos profile is most likely needed for connectivity to open-
ldap server due the fact that GSSAPI is used.

A quick fix is to add:
/var/tmp/krb5* rk,

into:
/etc/apparmor.d/local/usr.sbin.slapd

** Affects: apparmor (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gssapi kerberos5 slapd

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https://bugs.launchpad.net/bugs/1934390

Title:
  Apparmor prevents locking of /var/tmp/krb5* file for slapd

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