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DOC: Make how "option redispatch" works more explicit 

People are often misled and think that this option can redirect
connections to backup servers.

This patch makes the documentation more specific about how the option
handles backup servers.
This commit is contained in:
Olivier Carrre 2020-04-15 11:30:18 +02:00 committed by Willy Tarreau
parent bb86986253
commit 6e6f59b7e0
1 changed files with 20 additions and 0 deletions
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20
doc/configuration.txt
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@ -7616,6 +7616,26 @@ no option redispatch
Specifying "option redispatch" will allow the proxy to break cookie or Specifying "option redispatch" will allow the proxy to break cookie or
consistent hash based persistence and redistribute them to a working server. consistent hash based persistence and redistribute them to a working server.
Active servers are selected from a subset of the list of available
servers. Active servers that are not down or in maintenance (i.e., whose
health is not checked or that have been checked as "up"), are selected in the
following order:
1. Any active, non-backup server, if any, or,
2. If the "allbackups" option is not set, the first backup server in the
list, or
3. If the "allbackups" option is set, any backup server.
When a retry occurs, HAProxy tries to select another server than the last
one. The new server is selected from the current list of servers.
Sometimes, if the list is updated between retries (e.g., if numerous retries
occur and last longer than the time needed to check that a server is down,
remove it from the list and fall back on the list of backup servers),
connections may be redirected to a backup server, though.
It also allows to retry connections to another server in case of multiple It also allows to retry connections to another server in case of multiple
connection failures. Of course, it requires having "retries" set to a nonzero connection failures. Of course, it requires having "retries" set to a nonzero
value. value.