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Docker Swarm HAproxy Keepalived | About

Docker Swarm HAProxy Keepalived is a combination of technologies used to deploy a highly available Docker Swarm cluster with load balancing and failover capabilities.

Swarm is a native container platform offered by Docker. On the other hand, HAProxy and Keepalived help manage load balancing and ensure the high availability of services running within the Swarm cluster.

Today, we are going to take a look at how to set up a highly available Docker Swarm cluster with HAProxy and Keepalived:

1. First, we have to set up a Docker Swarm cluster by choosing a node to act as the Swarm manager and adding worker nodes to the cluster. In other words, the manager node manages the Swarm, schedules containers, and handles the cluster’s configuration.
2. Furthermore, on the manager node, we have to deploy HAProxy as an ingress controller. So when HAProxy receives external traffic, it routes it to the services running on the worker nodes in the Swarm.
3. Next, we have to install Keepalived on each node and configure it to manage the virtual IP address used by HAProxy. This makes sure that only one node at a time holds the VIP.
4. Additionally, we have to implement health checks in HAProxy to monitor the health of the containers running the services in the Swarm. If a container becomes unhealthy, HAProxy will stop directing traffic to it, so that only healthy containers receive incoming requests.
5. Now, HAProxy takes care of load balancing the incoming traffic among the healthy containers running the services in the Swarm. This distributes the load evenly across the nodes.
6. Finally, it is important to thoroughly test the failover mechanism offered by Keepalived to ensure that the VIP is transferred to a healthy node in case of a failure, and the services remain available.

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Conclusion

In summary, our Support Techs introduced us to Docker Swarm HAproxy Keepalived.