I'm completely newbie in mysql cluster. I was trying long ours to find if, when I setup magento with mysql cluster, it will write to one of the nodes or always to one node?
My second question is, when I setup mysql replication: one master and one slave, and master server die, will magento start to write on slave, or my app stop working?
Thanks a lot!
1)
Magento supports by default: 1 master and multiple read slaves.
For specific modules you can define different read/write custom connections. So, with this setup you could write data to multiple mysql master servers.
Notice: None of the large Magento hosting partners/providers (nbs, nexcess, peer1, etc) managed to have a working solution with multiple db masters.
2) No. there is no auto switch to slave.
Related
Is it possible to sync 2 MYSQL databases so if you write into one it will sync add it to the other one too and other way around? I've seen some Programs that you can use on your local pc but I need a script for example php that I can upload to my vps, it checks every minute for new data and syncs it.
Is that possible?
Are you tried Mysql Replication strategies? See MySQL Replication for High Availability.
Specially Master with Backup Master (Multiple Replication)
or Master with Active Master (Circular Replication or Ring topology)
We have the requirement to synchronize the data in a table across multiple MySQL databases. One of the databases would be the source, and all others need to have the synchronized data for one of the tables.
We have multiple databases used in microservice architecture, and they all need to have a local copy of a specific table in their database, and not the entire database itself, hence read replica or multi-AZ configuration is not the solution.
Database: MySQL hosted on AWS RDS
Is there any managed service by AWS or another vendor that can be used to accomplish this? Or do we have to write a custom script to do that?
It's a simple MySQL replication. But you have to replicate the whole database. So create a MySQL database in AWS and enable Multi-AZ replication and activate the automatic snapshots.
The A-Z Replication is synchronous. When you use a "Read replica" it's asynchronous. So if you have very important data you should enable Multi-AZ replication.
https://aws.amazon.com/rds/details/multi-az/?nc1=h_ls
I think you have to either isolate the table in one database and replicate that database or write a custom script.
If I were writing a custom script I would look at the binlog functionality. Here are some helpful links:
https://dev.mysql.com/doc/refman/5.7/en/mysqlbinlog.html
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_LogAccess.Concepts.MySQL.html (at the bottom).
I didn't find useful information in documentation that is why I decided to ask.
My environment is as this: Two MySQL servers with Master <-> Mater replication (let's call it Node1 and Node2).
All applications (99%) connects to Node1, on Node2 only one application which is doing INSERTS in a separate DB.
So - changes are propagated to both nodes because of replication. Also because of replication I have relay-bin-logs and bin-logs (on both servers).
I take backup on Node2 using mysqldump
QUESTION:
in case of restore what I need to apply to DB?
only "relay-bin-logs"?
only "bin-logs"?
both?
What is the sequence?
(link to documentation is also appreciated)
Thanks!
P.S. In case of simple MySQL server (without replication) everything is pretty simple - restore from backup and after this apply bin-logs.
I am looking at creating a high availability Wordpress installation across two servers with a load balancer to distribute the traffic between these servers, I intend to setup a LAMP stack on these two web servers and configure MySQL master master replication to ensure both servers have the same content similar to the setup at https://www.linode.com/docs/websites/cms/high-availability-wordpress
For anyone created a similar setup before, is there anything to watch out for? Will this work without there being differences in the database assuming both nodes are online? If one node goes down will this synchronise with the other master node successfully?
This is a pretty old post, but I've set up exactly this recently.
I do not recommend setting up WordPress with master-master replication. The nodes went out of sync multiple times and resulted in split-brain. We've reverted back to master-slave replication because of the instability of the setup.
I recently tried this and regret it. I realize your post is now almost 2 years old, but thought I should put in my 2 cents for anyone considering this approach. I recommend you go with MariaDB with MaxScale to separate the reads and writes, and go with master-slave configuration. I'm running into all sorts of deadlocks, and issues with this configuration. Currently using MariaDB with Galera, with HAProxy up front.
I have setup master-master mysql replication in 2 different nodes. Suppose If i am going to add one more node, i.e 3rd master , do I need to have a exactly the same copy of the database in the new server as in the node-1 and node-2 ?
These are high traffic servers and will be keep on updating the database every seconds, so we would like to do it with out downtime. Is there any way to do this, with out downtime ?
MySQL 5.1.18, it is possible to use MySQL Cluster in multi-master replication, including circular replication between a number of MySQL Clusters.
Detailed explanation is explained here:
http://dev.mysql.com/doc/refman/5.1/en/mysql-cluster-replication-multi-master.html