Azure Mirroring - VIP

Question

Question

jennifer mccallum · Aug 4, 2021

#Azure #Cloud #Mirroring #InterSystems IRIS

Has anyone firstly got VIP working for mirroring in Azure? We are pretty sure that this won't work but I wanted to verify it.

Has anyone used the Azure Load balancer to act as a Virtual IP and if so was a application gateway required.

Interested to know your experiences in getting this working.

Product version: IRIS 2020.4

Discussion (9)1

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Vic Sun · Aug 4, 2021

Hello Jennifer,

While ISC docs are down currently, here's a web archive link to the section that discusses VIPs in the cloud:

https://web.archive.org/web/20201026104034/https://docs.intersystems.com/irislatest/csp/docbook/Doc.View.cls?KEY=GHA_mirror_set

"Typically, a VIP cannot be used in cloud environments. For a review of the options for configuring application redirection following failover in a cloud environment by an InterSystems Principal Technology Architect, please see Database Mirroring without a Virtual IP Address on InterSystems Developer Community."

Here are links to that and another potentially useful article on the community.

https://community.intersystems.com/post/database-mirroring-without-virtual-ip-address

https://community.intersystems.com/post/intersystems-example-reference-architecture-microsoft-azure-resource-manager-arm

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score 0 · Answer 1 · 2021-08-04T09:26:00-04:00

Hello, I have setup IRIS mirror in AWS using Elastic Container Service / Fargate. I did not utilize a load balancer for mirror setup.

score 0 · Answer 2 · 2021-08-04T09:42:40-04:00

jennifer mccallum · Aug 4, 2021

Hi do you have any more info on this please?

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score 0 · Answer 3 · 2021-08-04T09:58:33-04:00

I was planning to write an article about this topic in current tech article contest. I will get started on it today.

score 0 · Answer 4 · 2021-09-23T00:56:29-04:00

Hello,

We are currently utilising the Azure basic load balancer to act as a vip in Azure for both our IRIS 2020 mirrors.

Did you managed to get this working?

score 0 · Answer 5 · 2021-09-23T09:31:07-04:00

Hello, I want to post update that InterSystems told me they did not support mirror with AWS Fargate because mirror requires static ip. I wanted to use containers running on Fargate serverless which will change ip each time a new container starts.

score 0 · Answer 6 · 2023-08-21T10:15:12-04:00

Hello Oliver,

I read a few post of yours and came to understand that you were attempting to get mirroring setup, on Azure. We also have a similar requirement where we are trying to setup mirroring . The available options were:

1. Use IKO (containerised setup)

2. Use VMs to setup mirroring

We are able to not setup IKO on Azure and the fall back of setting up mirroring on Azure may also not be possible as per the above comments. Is that still the case? Did you overcome this situation somehow?

score 0 · Answer 7 · 2023-08-21T23:38:30-04:00

Hi Jennifer,

first things yes mirroring is supported in AWS and Azure. What is not working is the automatic VIP failover managed by IRIS. This is due to limitations imposed by the cloud providers, as you cannot dynamically add an IP address.

For this usually a loadbalancer is utelized, that queries a specific csp page on the mirror servers to decide which mirror is active and redirect the "VIP" accordingly.

Also depending on what access (application,xDBC) you need, you can deploy a load balanced array of web servers. These can host the webgateway, which in turn can be configured to be mirror aware and does no tneed a VIP to automatically failover.

Best Regards

Timo

score 0 · Answer 8 · 2023-08-22T02:19:44-04:00

Eduard Lebedyuk · Aug 22, 2023

There are ways to enable VIP in AWS for IRIS without an additional NLB.

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