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From Szalay-Bekő Máté <szalay.beko.m...@gmail.com>
Subject Re: Side affects of setting quorumListenOnAllIPs to true
Date Mon, 15 Jun 2020 06:39:23 GMT
Hi Ram,

I am not sure I understand your question. The config quorumListenOnAllIPs
is about to specify if the ports ZooKeeper uses for Server-to-server
communication should bind on the specified address/IP
(quorumListenOnAllIPs=false) or on 0.0.0.0 (quorumListenOnAllIPs=true).

An example: You configure your server list using either static or dynamic
configuration like:
server.1=a.foo.com:2888:3888
server.2=b.foo.com:2888:3888
...

In this case when server.2 starts, it reads the config then initiates
connection (for ZK internal leader election protocol) to server.1 by
connecting to a.foo.com:3888 and sending it's own address (b.foo.com:3888)
enabling server.1 to connect back. However, if server.2 is behind a proxy /
using kubernetes / whatever, then it is possible that you can reach
server.2 as b.foo.com but the ZK process on server.2 can not actually bind
on b.foo.com:3888. In this case the easiest solution is to bind on
0.0.0.0:3888. However, you can not set 0.0.0.0:3888 in the config file of
server 2, since in this case server.2 would send 0.0.0.0:3888 in the
initial message to server.1 and server.1 would try to connect back to
server.2 using 0.0.0.0:3888 what is a bad idea. So in this case it comes
handy to set quorumListenOnAllIPs=true which will cause ZooKeeper to bind
on 0.0.0.0:3888 and still send a 'valid' address in the initial message, an
address where other servers can reach it.

I hope the explanation made it more (and not less) clear :p

Kind regards,
Mate


On Fri, Jun 12, 2020 at 7:42 PM rammohan ganapavarapu <
rammohanganap@gmail.com> wrote:

> Hi,
>
> I am trying to see what are the pros and cons of setting
> quorumListenOnAllIPs to true. Running zookeeper cluster in mtls or local
> proxy environments is not working by keeping default value (false). So can
> someone please explain?
>
> Any way zookeeper will form quorum with the servers list from the zoo.conf
> static file right? so by enabling this property can any server or IP out of
> the zoo.conf can join the quorum?
>
> Ram
>

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