Re: redis replication and fail-over in Amazon EC2 multi-region

[Dvir Volk]

that's a very interesting question.
It should be doable by setting up a VPC that keeps all your ips "internal".

but perhaps solving this from inside sentinel somehow is also worth the effort.


On Mon, Nov 12, 2012 at 8:20 AM, Terance Dias <teranc...@gmail.com> wrote:
> Hi,
>
> Our infrastructure is in Amazon EC2 and we're trying to have redis
> replication and fail-over in a different EC2 region so that our application
> can continue to work even if something goes wrong in 1 region.
> I'm able to set up replication across regions. We are trying to deploy
> sentinel to do the monitoring and fail-over. But because of the way Amazon
> EC2 handles public IP address (i.e. it does not create a public IP interface
> for the node but uses NAT to map public IP to private IP), we are facing
> some issues sentinel instances in different regions talking to each other
> and with some instances. I just wanted to know if there is a way to get
> sentinel to work across EC2 regions.
>
> Thanks,
> Terance.
>
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--
Dvir Volk
Chief Architect, Everything.me
http://everything.me

[Josiah Carlson]

Perhaps you mean VPN.

For the OP's question, EC2 instances have external IP
addresses/domains listed in the management console. You can use them
for connecting between regions. That said, anything between data
centers should be encrypted, and arguably compressed;
http://3scale.github.com/2012/07/25/fun-with-redis-replication/ offers
some reasons why.

- Josiah

[Dvir Volk]

Amazon VPC is their cloud VPN of sorts:

http://aws.amazon.com/vpc/faqs/#G1

[Josiah Carlson]

The issue is that you still have the cross region issue of needing to
have an external IP address and communicating between them.

- Josiah

[Dvir Volk]

I haven't read their FAQ entirely but from what I gather, the answers in this section suggest that it is possible, the only limit is multiple AZs can't be in the same subnet:

http://aws.amazon.com/vpc/faqs/#E1b

but anyway, there should be a way to do this in sentinel.

[Josiah Carlson]

As stated earlier in the thread, this isn't a Redis issue, this is an
IP configuration issue, and a "how do we get our traffic
compressed/encrypted between Redis" issue.

If you set up a VPN and use the VPN addresses, you can handle the IP
configuration and encryption issues, though depending on your VPN, you
may have bandwidth issues (unrelated to compression).

Regards,
- Josiah

On Thu, Jan 17, 2013 at 8:42 AM, Roma Koshel <roma....@gmail.com> wrote:
> I have the same problem. Is there a way to do this with redis?

> https://groups.google.com/d/msg/redis-db/-/Zt5igIAK2bkJ.

[Roma Koshel]

Can I set sentinel's IP(amazon EC2 public IP) manualy in sentinel.conf that others sentinels know public IP, not private?