Nginx response with persistence session and backend server failure
bhuvangu at gmail.com
Mon Jul 27 07:10:04 UTC 2015
I was reading Nginx documentation
persistence session using cookie and below is from documentation
A request that comes from a client not yet bound to a particular server is
passed to the server selected by the configured balancing method. Further
requests with this cookie will be passed to the designated server. *If the
designated server cannot process a request*, *the new server is selected as
if the client has not been bound yet*.
The last line says that
*If the designated server cannot process a request*.
What does it mean to say "the server cannot process a request."
Does it mean the server was down ?
or does it mean server responded with some error code ?
or does it mean that it did not responded in a certain time interval ?
or does it mean that max number of connection limit is reached on that
Let say there were 3 backend-server and we are using session persistence
Now assume that 2 of the backed server goes down so niginx will route all
request to 3rd server
Now 2 other server came back online, will niginx use the other 2 server to
route the request even if request have the persistence cookie for 3rd
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