50322dff81
Allow the user to set the "initial state" of a server.
Context:
Servers are always set in an UP status by default. In
some cases, further checks are required to determine if the server is
ready to receive client traffic.
This introduces the "init-state {up|down}" configuration parameter to
the server.
- when set to 'fully-up', the server is considered immediately available
and can turn to the DOWN sate when ALL health checks fail.
- when set to 'up' (the default), the server is considered immediately
available and will initiate a health check that can turn it to the DOWN
state immediately if it fails.
- when set to 'down', the server initially is considered unavailable and
will initiate a health check that can turn it to the UP state immediately
if it succeeds.
- when set to 'fully-down', the server is initially considered unavailable
and can turn to the UP state when ALL health checks succeed.
The server's init-state is considered when the HAProxy instance
is (re)started, a new server is detected (for example via service
discovery / DNS resolution), a server exits maintenance, etc.
Link: https://github.com/haproxy/haproxy/issues/51
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