Implementing a Gerrit Multi-Master Setup with AWS Load Balancers & Kafka

[Hamid Narimani]

Dear Gerrit Community,

I'm currently in the process of configuring a Gerrit multi-master setup.
My setup incorporates AWS Load Balancers and Kafka running on EC2 with Docker Compose. I'd like to share some insights and seek advice on a few challenges encountered, especially regarding session continuity and configuration conflicts.

Key Components:
Gerrit Multi-Master Configuration: Enhancing fault tolerance and load distribution.
EFS: mounted git on both master
RDS MYSQL: is same for both master
Region: both on same region and VPC
AWS Load Balancers: Using ALB for HTTP/HTTPS and NLB for SSH.
Kafka & ZooKeeper on EC2/Docker Compose
Configuration and Challenges:
AWS ALB and NLB required fine-tuning to support sticky sessions essential for maintaining user session integrity in OAuth flows.

Encountered a Guice Binding Conflict when integrating ZooKeeper, highlighting the complexities of configuring a multi-master setup. This issue has been particularly challenging, and I'm seeking insights or solutions from the community.

Exception in thread "main" com.google.inject.CreationException: Unable to create injector, see the following errors:1) [Guice/BindingAlreadySet]: AllUsersName was bound multiple times.Bound at:

1  : InitModule.configure(InitModule.java:47)

2  : ZkInit$1.configure(ZkInit.java:90)

Learn more:

  https://github.com/google/guice/wiki/BINDING_ALREADY_SET1 error======================

Full classname legend:

======================

AllUsersName: "com.google.gerrit.server.config.AllUsersName"

As I work through these challenges, particularly the session continuity issue and the Guice binding conflict, I'm re-evaluating the architecture, specifically the use of AWS Load Balancers for this setup. I'm curious about the community's thoughts on the viability of this setup and whether switching to a solution like HAProxy might offer a more streamlined or effective approach, especially in the context of Gerrit's multi-master configuration.

Thank you for any guidance or insights you can provide.

[Marcin Czech]

Hi Hamid,

If you would like to get more context how to setup Gerrit multi-site using AWS infrastructure you can have a look at https://gerrit.googlesource.com/aws-gerrit/ This projects contains a collection of AWS CloudFormation templates and scripts to deploy Gerrit in AWS

Best regards,
Marcin Czech

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