HAProxy for Patroni HAProxy checks the nodes’ status using the httpchk option, but the replicas of your Patroni cluster do not respond to the HTTP check on port 8008 in the same way as the primary node. In a Patroni cluster, only the leader should respond as active on this HTTP port, while the replicas might not, causing HAProxy to mark them as “down.” Adjust the HAProxy configuration to properly check the nodes’ status based on their roles within the cluster (leader or replica)....
Overview Keepalived, which is mainly used to provide high availability by implementing the VRRP (Virtual Router Redundancy Protocol). Your configuration is commonly used to monitor services like HAProxy and automatically switch between servers in case of failures. 1 2 3 4 5 6 7 apt update && sudo apt upgrade -y apt install keepalived -y vi /etc/keepalived/keepalived.conf systemctl restart keepalived systemctl enable keepalived INTERFACES : Ensure that ethX is the correct interface on your server....
Setting a cluster up and running
Replication overview
Patroni cluster for Postgresql databases
High Availability Postgresql cluster