High availability
LemonLDAP::NG is highly scalable, so easy to insert behind a load-balancer:
Portal does not store any data outside the session database, so you can have many portal servers using the same HTTP host name
All handlers download the whole configuration, so many servers can serve the same virtual hosts
You can for example set up a fail-over cluster with Heartbeat and HAproxy, like this:
You just have to share configuration and sessions databases between those servers: