I am exploring AWS RDS, I have migrated the MySQL db to RDS dbinstance.
Now I want to test the Amazon RDS - Multi-AZ Deployments For Enhanced Availability & Reliability feature.
How can I replicate the test scenario where the primary Database failure doesnot cause any harm to the secondary server.
I have refferred to this link.
http://aws.typepad.com/aws/2010/05/amazon-rds-multi-az-deployment.html
Thanks
You can use the RebootDBInstance API to force a fail over to the other AZ. Just set the ForceFailover parameter to true
Of course, you can also use the web console to Reboot your DB instance, as described here.
--Seb
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From my understanding, Aws RDS facilitate backup for the mysql database, but it is not cheap.
While using docker image for mysql may save us more in terms of cost? Because we only need to download the docker image for dockerhub and directly use it for free(e.g. create an instance and run the container).
Is there another reason of using RDS other than facilitating backup for the database?
I list several features of RDS which may warrant using it over self-managed MySQL docker container on an EC2 insistence or ECS:
RDS is managed service, so all OS updates, MySQL patches are managed by AWS and you don't have to worry about them.
RDS supports storage auto-scaling - you can start with small db, and RDS will extend storage automatically as needed.
Point-in-time recovery allowing you to "rewind" your recent db changes.
Read replicas - you can create up to 5 read replicas of your database to off-load read intensive applications from your primary db instance.
Cross-region read replica - you can have your replica in different region which is good for disaster recovery (entire AWS region goes down)
Automated and manual backups, including backups to a different region.
IAM authentication to your db instead of regular username/password.
Multi-AZ - RDS can keep a stand-by replica of your primary database instance in different availability zone, for quick recovery if it fails.
CloudWatch integrated db metrics and logs.
RDS event notifications allow you for straight-forward development of automations e.g. invoke lambda automatically for every backup, or if something fails.
Easier integration with other services, e.g. use of RDS Proxy in Lambda functions.
All these and other features of RDS make it much more expensive then hosting a self-managed MySQL docker container. But if MySQL in docker container meets all your requirements, then there is no need to use RDS. You can always start with the docker, and if your data and requirements grow, you can migrate to RDS.
We use RDS MySQL with a micro service architecture. Each service has its own database and we have been slowly moving them into their own instances for load management and whatnot.
We have a replica still attached to the primary instance (where most of the databases still reside) but it is missing the databases that are on their own instances. We would like to have a single read replica that sources from all of the instances so that we can run sanity checks on the data without needing to move data between instances.
Does RDS support a multi source read replica? Or will we need to manage our own MySQL install in order to accomplish this?
As far as I know, you will have to operate MySQL yourself on EC2 to get the multi-source replication feature. You may like to contact your AWS support representative to confirm this.
AWS RDS does not support multi-source replication. Configuring replication from an external master is limited because you have to configure it using a stored procedure provided by AWS. It does not have any support for configuring multiple replication channels. Each replica has exactly one master.
AWS Aurora 2.x (API-compatible with MySQL 5.7) also does not support multi-source replication. As of Aurora 2.07.x, they list multi-source replication among features of MySQL 5.7 they do not support. See https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Updates.2070.html
AWS Aurora 1.x (API-compatible with MySQL 5.6) has something they call multi-master cluster, where all the nodes in a cluster can be writers. I have not used this, and I don't know how reliable it is. See https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-multi-master.html for details.
It's weird that they seem to have lost functionality between Aurora 1.x and 2.x. My understanding is that they sort of "started over" with Aurora 2.x, and some features haven't been implemented in the new version yet.
This is my understanding as of December 2019. Of course future versions may add such features.
I am planing to migrate my Db from rackspace to AWS. The current db has around 50GB of size.
So how can i export this Db from rackspace without downtime.Or any other solutions like direct migration from rackspace to AWS RDS
Amazon provides multiple options in the RDS docs. Have you read them?
My preference would be to set up replication between your Rackspace instance and a new RDS instance. This will minimize your downtime: when you're ready you shut down your applications, reconfigure them to use the new database, and you're done.
I recommend planning for at least three attempts, since replication can be tricky the first time you set it up. Even if you get the replication right on the first try, I strongly suggest that you bring up a test environment and do a complete regression test of your app, before repeating the replication for your production cutover.
Yes, You can easily achieve migration without any outage using DMS services given by Amazon. I used DMS for migration from Company Hosted Environment to RDS.
I am struggling to setup replica with Amazon RDS. I want to make RDS as my master but for slave I want to setup my server outside of RDS. For now I am setting my slave at EC2. I have checked AWS doc for the information but could not find the exact answer to my question.
However I did found a blog post which have POC for doing it http://www.ruempler.eu/2013/07/07/replicating-aws-rds-mysql-databases-to-external-slaves/
But the problem that I facing is I am getting error
ERROR: Got error reading packet from server: Slave can not handle replication events with the checksum that master is configured to log
I tried to set binlog_checksum = none at RDS but RDS is not letting me change its config file.
Please suggest me folks!!
You can use AWS DMS (Data migration service) for this purpose. It will support replication between any 2 MySQL DBs.
Please refer our blog:
https://medium.com/tensult/cross-account-and-cross-region-rds-mysql-db-replication-part-1-55d307c7ae65
The question is quite old, but I bumped into it while searching for similar functionality. Amazon supports both replication from an external master and replicating to an external slave these days:
Replication from external master:
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL.Procedural.Importing.External.Repl.html
Replication to external slave:
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL.Procedural.Exporting.NonRDSRepl.html
Hope this helps future searchers.
It does not appear to be possible as of now (December, 2017).
Looking at #walter-heck's second link above, it is actually (another) explanation of "... replication between an external master instance and a DB instance on Amazon RDS".
It does not appear you can setup an external replica which connects to a RDS running as master.
AWS does offer this service, of course, however each replica must be within RDS.
With all the service offerings AWS has, one would think this would be possible. However, it may not work well with the AWS business model, because you don't pay based on external replicas - you pay based on RDS size.
I have an application database running with MySQL engine on Amazon RDS. For better availability of our data for users in all parts of the world I'm looking for the best solution.
In the previous version of the application, we mirrored our database in US and Singapore, so that users got a better performance in terms of speed and on our side, we had backup if any disaster occurred.
Now as we moved to Amazon, will having Multi A-Z Deployment serve us in the same way? I mean replicates the database in all regions but will RDS still work in a single region only?
I have done some studies but still not sure so please ask me any further questions if I'm being puzzling.
Thank you.
I think you need both the Multi-AZ and the Read Replica features of AWS RDS.
Multi-AZ just creates a non-accessible secondary DB in another availability zone and in case the primary fails, AWS would switch over to the secondary DB. So you have failover.
In the case you want to increase the performance, and your application can work in read-only mode in Singapore (for example), the Read Replica would be perfect. If writes are also required, you would need to route them to the primary read-write database.
AWS supports a combination of the two approaches.
RDS MySQL Multi-AZ deployments currently works only inside an Amazon EC2 region. RDS Read replica's also need to be present inside the same Amazon EC2 region. Inter region replication is the most requested feature in AWS RDS to replicate data to another RDS in Alternative Amazon EC2 region. It is in their road map currently.