The Build


One of those things: pgbouncer and self-signed certificates

23 July 2018

(This is another intermittent series of small things that are easy to forget, and cause irritation in the PostgreSQL world…)

Since version 1.7, pgbouncer has had built-in TLS support. This is very handy, since the previous versions required stunnel or something similar to provide TLS.

Frequently, either for test purposes or because you’re in an environment where checking client certificates isn’t required, pgbouncer is set up using a self-signed client certificate. It’s easy to forget that you need to set the certificate authority parameter to point to the certificate file in this case, but you do:

client_tls_sslmode = allow
client_tls_key_file = /etc/pgbouncer/pgbouncer.key
client_tls_cert_file = /etc/pgbouncer/pgbouncer.pem
client_tls_ca_file = /etc/pgbouncer/pgbouncer.pem  ; don't forget this one!

Note that it’s generally not a great idea to use a self-signed certificate in production, since you are vulnerable to man-in-the-middle attacks in that case.

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