LDAP
From Wikitech
Hosts should be to use LDAP for users and some other stuff.
setup LDAP client on new machine
- run /home/wikipedia/bin/setup-ldap
- copy zwinger:/etc/ldap.conf to the new machine
LDAP server is on srv1 (master) and srv2 (slave). failover should be automatic. to add new users, add them on srv1, then run ldapsync. srv2 will update automatically.
Overload
If the local caching daemon nscd dies on clients, the server can get badly overloaded and logins can fail.
If necessary restart it sitewide. :P
Server logging
slapd's logging stuff goes to a channel on syslog that's not logged by default. On a new server, you may have to manually edit syslog.conf and add something for local4.*
Then set an appropriate loglevel in /etc/openldap/slapd.conf