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Add an EnvironmentFile directive to read in a configuration file with environment variables. The "-" prefix means it can proceed if the file doesn't exist. This would allow users to keep sensitive information like the SUPERUSER/REPLICATION passwords in the config file separate from a YAML file that might be deployed from source control.
confd
confd directory contains haproxy template files for the confd -- lightweight configuration management tool
You need to copy content of confd directory into /etcd/confd and run confd service:
$ confd -prefix=/service/$PATRONI_SCOPE -backend etcd -node $PATRONI_ETCD_URL -interval=10
It will periodically update haproxy.cfg with the actual list of Patroni nodes from etcd and "reload" haproxy when it is necessary.
startup-scripts
startup-scripts directory contains startup scripts for various OSes and management tools for Patroni.