In this article we will explore how to configure MySQL Master-Master Replication. The process involves setting up a cluster with multiple MySQL servers and databases. You must know the database status on Server 1 before starting the replication process. To ensure that the replication process works correctly, you must make sure that the server A is the master. This process can fail because of configuration file bugs, so make sure that you check the mysql error logs to identify the problem.
You can also use the master-slave configuration. However, you must be aware of several issues associated with the master-slave setup. For example, if you are using multiple servers to scale your MySQL environment, you may experience out-of-sync results due to two instances sending the same query. For this case, you should use the same manual for all the instances, instead of creating a separate database for each slave.
The main problem with this setup is that each server needs a unique index to keep track of data in two different locations. This makes it difficult to create replication scenarios. Moreover, master-master replication is cumbersome, and the deployment process is long and tedious. It is better to use multi-master replication if the data is highly sensitive. If you need to scale your MySQL cluster to several masters, make sure that each server has a unique index.
You can configure Master-Master MySQL Replication to use multiple servers with different roles. A master server can also be used as a backup server. It has many advantages. Besides providing redundancy, it also allows for increased speed, and can be used in scenarios where one server is down. Moreover, you need only a few VPS servers. To balance the load, you can also set up a HAProxy server.
In multi-hosting scenarios, MySQL master-master replication can be a challenge. This is because the server needs to be constantly monitored for problems and errors. The high failure rate also makes multi-hosting replication more challenging. Therefore, DigitalOceans provides special treatment to MySQL master-master replication. This will make the master-master server more reliable than the other. The master-master database will be available for reads and writes from both servers.
You can choose between using native mysql or Tungsten for master-master MySQL Replication. If you have an odd number of clusters, you can choose a configuration with two masters. In this case, the indexes and caches won't be updated. Besides, you will have to be aware that your One Group can't have more than nine nodes. If your masters fail, the replication will still work if it has enough masters.
However, you must remember to be cautious with active/passive replication. A down master prevents the replication from propagating to its slaves. Additionally, this type of replication is not recommended for all environments. In fact, it can lead to conflicting changes. The active master might also become a bottleneck when it cannot handle the workload from the other master. This is the reason why you should carefully consider this option if you're using multiple MySQL servers.
