After installing pgbouncer-1.5.5-1.rhel7.x86_64.rpm on CentOS 7.0, it
does not remain running. No errors are logged.
I think the systemd configuration is faulty. It currently reads
[Service]
Type=forked
...
ExecStart=/usr/bin/pgbouncer -d -v ${BOUNCERCONF}
If I change that to
[Service]
Type=simple
...
ExecStart=/usr/bin/pgbouncer -v ${BOUNCERCONF}
it works
Alternatively, the first version can be made to work by adding
RemainAfterExit=yes.
But clearly, the second version is more in line with the systemd philosophy.