Steps used to create our certs

# Generate CA cert
$ openssl req -new -newkey rsa:2048 -nodes -keyout root-ca.key -x509 -days 3650 -out root-ca.pem -subj "/C=US/ST=Texas/L=Austin/O=OpenStack Foundation/CN=gearman-ca"

# Generate server keys
$ CLIENT='server'
$ openssl req -new -newkey rsa:2048 -nodes -keyout $CLIENT.key -out $CLIENT.csr -subj "/C=US/ST=Texas/L=Austin/O=OpenStack Foundation/CN=nodepool-$CLIENT"
$ openssl x509 -req -days 3650 -in $CLIENT.csr -out $CLIENT.pem -CA root-ca.pem -CAkey root-ca.key -CAcreateserial


# Generate client keys
$ CLIENT='client'
$ openssl req -new -newkey rsa:2048 -nodes -keyout $CLIENT.key -out $CLIENT.csr -subj "/C=US/ST=Texas/L=Austin/O=OpenStack Foundation/CN=gearman-$CLIENT"
$ openssl x509 -req -days 3650 -in $CLIENT.csr -out $CLIENT.pem -CA root-ca.pem -CAkey root-ca.key -CAcreateserial


# Test with geard
# You'll need 2 terminal windows
geard --ssl-ca root-ca.pem --ssl-cert server.pem --ssl-key server.key -d
openssl s_client -connect localhost:4730 -key client.key -cert client.pem -CAfile root-ca.pem