~?~

~?~

~?~

~?~

~?~

SERF Download Github Intro Docs Community What is Serf? Use Cases Serf vs. Other Software ZooKeeper, doozerd, etcd Chef, Puppet, etc. Fabric Consul Custom Solutions Getting Started Install Serf Run the Agent Join a Cluster Event Handlers Custom User Events Custom Queries Next Steps We've now seen how to start Serf agents and join them into a cluster. While this is cool to see on its own, the true power and utility of Serf is being able to react to membership changes and other events that Serf invokes. By specifying event handlers , Serf will invoke custom scripts whenever an event is received. To start, let's create our first event handler. Create a shell script named handler.sh with the following contents and make sure that it is set to be executable ( chmod +x handler.sh ). #!/bin/bash echo echo "New event: ${SERF_EVENT}. Data...

SERF Download Github Intro Docs Community Serf relies on an efficient and lightweight gossip protocol to communicate with nodes. The Serf agents periodically exchange messages with each other in much the same way that a zombie apocalypse would occur: it starts with one zombie but soon infects everyone. In practice, the gossip is very fast and extremely efficient. Serf is able to quickly detect failed members and notify the rest of the cluster. This failure detection is built into the heart of the gossip protocol used by Serf. Like humans in a zombie apocalypse, everybody checks their peers for infection and quickly alerts the other living humans. Serf relies on a random probing technique which is proven to efficiently scale to clusters of any size. In addition to managing membership, Serf can broadcast custom events and queries. These can b...