a9s MariaDB

info

Although a9s MySQL has been renamed to a9s MariaDB, it should be noted that every a9s MariaDB version >=10.6 is to be considered part of a new data service.

Be aware that from the a9s MariaDB 10.6 version there were also some changes in the name of some properties, the data service names, domain names, metric names, etc. Most of these changes between the version are related to the name mysql and mariadb.

• a9s MariaDB versions < 10.6 will keep using mysql in most cases.
• a9s MariaDB versions >= 10.6 will use mariadb in most cases.

This documentation describes the a9s MariaDB. a9s MariaDB enables on-demand provisioning of VM-based dedicated MariaDB servers. Developers can create instances of a MariaDB server using Apps Manager or the Cloud Foundry Command Line Interface (cf CLI) and bind these instances to an app.

Depending on the chosen service plan, a service instance may be associated with a single, dedicated virtual machine, or a set of VMs consisting of multiple virtual machines comprising a cluster of MariaDB servers.

• Overview
• Current Features

Overview

When you run the cf CLI cf create-service a9s-mariadb106 command, the a9s MariaDB data service creates dedicated VMs for this service instance. This allows the best possible bad neighborhood protection.

MariaDB service instance provisioning, including VM orchestration, is entirely automated. This enables service instances to be highly isolated and shielded by infrastructure virtualization mechanisms.

Due to the on-demand provisioning on VMs, only existing service instances allocate infrastructure resources. These resources are released when service instances are destroyed. Using on-demand provisioning the number of service instances is not limited by design.

Current Features

The current version of a9s MariaDB includes the following key features:

Feature	Benefit
On­-Demand Service Instance Provisioning	a9s MariaDB deploys MariaDB instances automatically. Developers can provision a single-VM MariaDB server using a single command.
Service Instance Isolation	Each MariaDB server runs on a dedicated VM to ensure bad neighborhood protection in order to be aligned with enterprise security requirements. a9s MariaDB uses Cloud Foundry security groups to prevent network connections being established by unauthorized apps.
Smoke Tests	a9s MariaDB contains a post-deploy smoke tests errand that runs a series of basic tests against your installation to ensure that it is configured properly.
Service Instance Capacity Upgrade	Cloud Foundry Service Plan updates allow upgrades to the RAM, CPU, and storage capacity for your MariaDB instances.
Logging and Monitoring	Each MariaDB Service Instance provides log messages and MariaDB-specific metrics to one or more syslog/graphite endpoints. You can configure the syslog/graphite endpoint to receive logging and monitoring information.
Deployment Updater	This errand automatically updates the stemcell and all provisioned a9s MariaDB Service Instances to their latest version.
CF Service Guard	The CF Service Guard creates Cloud Foundry App Security Groups for your service instance VMs. When the IP address of a service instance changes, the CF Service Guard updates the ASG.
High Availability	a9s MariaDB ensures high availability. The Consul-based internal DNS system provided by a9s Consul DNS ensures that the connected application always connects to a working node.

Known Issues

• Due to a known limitation in the Galera Cluster, currently the tables that are persisted in storage engines other than InnoDB (e.g. Aria or MyISAM) can not be replicated. This limitation currently has the following effects:
  • System Variables cannot be replicated, therefore if a System Variable is set to a value dynamically, then this assignment won't be replicated to the other nodes