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From Thilo-Alexander Ginkel <th...@ginkel.com>
Subject Re: Strange zoo.cfg.dynamic.next generated via zookeeper Docker image
Date Fri, 24 Jul 2020 16:07:30 GMT
On Mon, Jul 20, 2020 at 2:29 PM Szalay-Bekő Máté
<szalay.beko.mate@gmail.com> wrote:
> Can you try to change your configs by not using 0.0.0.0 in the ZOO_SERVERS?
> Using 0.0.0.0 is not a recommended config since 3.5. If the java process
> can not bind (due to some virtual network issue) to the host provided in
> it's config, then you can use the quorumListenOnAllIPs parameter.
>
> So you should have the very same configuration for all nodes in your
> cluster, like:
>
> ZOO_CFG_EXTRA="quorumListenOnAllIPs=true"
> ZOO_SERVERS=server.1=x.x.x.1:2888:3888:participant;2181 \
>   server.2=x.x.x.2:2888:3888:participant;2181 \
>   server.3=x.x.x.3:2888:3888:participant;2181

That works, except that I cannot get the client port (2181) to listen
on 0.0.0.0 so it can be mapped to the outside. Any idea how to achieve
that?

-- 8< --
2020-07-24 16:04:59,243 [myid:] - INFO  [main:QuorumPeerConfig@456] -
clientPortAddress is 0.0.0.0:2181
2020-07-24 16:04:59,415 [myid:2] - INFO
[main:NIOServerCnxnFactory@674] - binding to port /0.0.0.0:2181
2020-07-24 16:04:59,483 [myid:2] - INFO
[QuorumPeer[myid=2](plain=[0:0:0:0:0:0:0:0]:2181)(secure=disabled):QuorumPeer@1371]
- LOOKING
2020-07-24 16:04:59,483 [myid:2] - INFO
[QuorumPeer[myid=2](plain=[0:0:0:0:0:0:0:0]:2181)(secure=disabled):FastLeaderElection@944]
- New election. My id = 2, proposed zxid=0xb00000000
2020-07-24 16:04:59,531 [myid:2] - INFO
[NIOServerCxnFactory.AcceptThread:/0.0.0.0:2181:NIOServerCnxnFactory$AcceptThread@209]
- accept thread exitted run method
2020-07-24 16:04:59,531 [myid:2] - INFO
[WorkerReceiver[myid=2]:NIOServerCnxnFactory@707] - binding to port
/10.147.254.2:2181
2020-07-24 16:04:59,531 [myid:2] - ERROR
[WorkerReceiver[myid=2]:NIOServerCnxnFactory@713] - Error
reconfiguring client port to /10.147.254.2:2181
-- 8< --

It seems Zookeeper is rebinding the client port to the announced IP
during the startup sequence.

I also tried specifying the bind address in ZOO_SERVER as well as
through clientPortAddress=0.0.0.0 - without any luck.

> BTW, unfortunately there is no such thing as "official zookeeper Docker
> image", at least it is not maintained by the Apache ZooKeeper community. (I
> don't know who is maintaining the image on dockerHub
> https://hub.docker.com/_/zookeeper - it would be nice to ask them to update
> their examples / documentation)

I'll open a PR once I get this sorted out. ;-)

Thanks,
Thilo

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