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Hi Ajay,<br>
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Memcached does not provide any replication, you basically just set
up individual memcached servers and specify multiple servers on the
client side. So if you lose one of the memcached servers (or its
restarted) then you lose all the data that it holds, but at least
the client has other places to store data. If using UUID tokens then
you are going to want to use SQL backend in a HA environment.
Alternatively have a look at using fernet token provider instead,
for fernet you only need to worry about rotation and replication of
keys rather than the replication of actual tokens themselves.<br>
<br>
Regards,<br>
Ross<br>
<br>
<div class="moz-cite-prefix">On 18/12/2015 6:26 PM, Ajay Kalambur
(akalambu) wrote:<br>
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<blockquote cite="mid:D298F534.E3B8%25akalambu@cisco.com"
type="cite">
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<div>Hi</div>
<div>If we deploy Keystone using memcached as token backend we
see that bringing down 1 of 3 memcache servers results in
some tokens getting invalidated. Does memcached not support
replication of tokens</div>
<div>So if we wanted HA w.r.t keystone tokens should we use
SQL backend for tokens?</div>
<div><br>
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<div>Ajay</div>
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