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When I'm using a SRV DNS record, what name(s) do I put in the TLS certificate? For example, if I'm setting up slapd on two servers (klas1 and klas2), and I define these DNS records (using bind zone file style notation):

_ldap._tcp.example.com. IN  SRV 10 0 389 klas1.example.com.
_ldap._tcp.example.com. IN  SRV 20 0 389 klas2.example.com.
klas1.example.com.  A 192.168.0.1
klas2.example.com.  A 192.168.0.2

I'd expect my clients would be configured to connect to ldap://example.com/. However when I'm generating TLS certificates on the servers, do I generate them with the name "example.com", or do I generate them with the name "klas1.example.com", or do I need both?

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The certificate must match the hostname, i.e. corresponding A record for the server. You could have individual klas1.example.com & klas2.example.com certificates or shared wildcard *.example.com certificate, but example.com won't match.

The SRV records don't need certificates as they are used only on DNS level for service discovery.

1

you only need your host entries (A records), services records are used for discovery not the connection itself.

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