MySQL for PCF
This is documentation for the MySQL for Pivotal Cloud Foundry (PCF) service tile. The tile can be downloaded from Pivotal Network.
MySQL is a powerful open-source relational database used by apps since the mid-90s. Developers have relied on MySQL as a first step to storing, processing and sharing data. As its user community has grown, MySQL has become a robust system capable of handling a wide variety of use cases and very significant workloads. Unlike other traditional databases which centralize and consolidate data, MySQL lends itself to dedicated deployment supporting the “shared nothing” context of building apps in the cloud.
The MySQL for PCF product delivers a fully managed, “Database as a Service” to Cloud Foundry users. The tile deploys and maintains a MySQL server running a recent release of MariaDB and Galera; an SQL proxy, Switchboard; and a service broker. The tile configures sane defaults for a general-use relational database service.
With MySQL for PCF installed, developers can attach a database to their apps in as little as two commands,
cf create-service and
cf bind-service. Developers can retrieve connection credentials in the standard manner, from the
VCAP-SERVICES environment variable. Developers can select from a menu of service plans options, which are configured by the platform operator.
You can deploy MySQL for PCF in either single-node or high availability (HA) topology. The HA topology has three MySQL servers, two proxies, and two service brokers, and you need to supply a load balancer.
The following table provides version and version-support information about MySQL for PCF:
|Release date||May 19, 2017|
|Software component version||MariaDB v10.1.20, Galera v25.3.19|
|Compatible Ops Manager version(s)||v1.9.x, v1.10.x|
|Compatible Elastic Runtime version(s)||v1.9.x, v1.10.x|
|IaaS support||AWS, Azure, OpenStack, and vSphere|
Before upgrading to the latest version of MySQL for PCF, do the following:
Confirm that you are on Ops Manager v1.9 or later and are on MySQL for PCF v1.8 or later.
Ops Manager Version Supported Upgrades from Imported MySQL Installation From To v1.9.x, v1.10.x v1.8.x v1.9.x
For more information about upgrade versions, see the Product Compatibility Matrix.
If you are running in the HA configuration, check the health of the cluster:
- Download, configure, and run the mysql-diag tool.
mysql-diagshows any cluster issues, fix them.
- Do not apply changes to the upgrade until the issues have been resolved.
As of v1.9.0, MySQL for PCF enables strict mode. This means that where previously large indices were silently truncated, now
CREATE INDEXstatements may fail with an error.
IMPORTANT: If any of your apps already use or want to create indices with more than 767 bytes, then create or alter the apps to useA workaround for failures due to strict mode is to use the
IGNOREkeyword: this converts the error to a warning.
For more information about these changes, see MySQL Server Tuning and Defaults.
In MySQL for PCF v1.8 and v1.9, new service bindings are not able to lock tables. In MySQL for PCF v1.10, the privilege to lock tables will also be removed from existing service instances.
WARNING: As of v1.10, MySQL for PCF will disallow LOCK TABLES for all applications.
In MySQL for PCF v1.10, apps will see an error when they attempt to lock tables.
When running in clustered mode, table-level locks are not distributed across the cluster. In the current version of MySQL for PCF apps are allowed apps to attain a table lock, even though it only exists on the current master. Apps and app developers are not aware that they do not exclusively have a lock across all nodes. This can lead to deadlocks when writes happen on different masters.
The table below shows the enterprise-readiness of each MySQL for PCF topology. Consult the Known Issues topic for information about issues in current releases of MySQL for PCF.
|Single-Node||High Availability (HA)|
|MySQL||1 node||3-node cluster|
|SQL Proxy||1 node||2 nodes|
|Service Broker||1 node||2 nodes|
|Multi-AZ Support||n/a||Yes *|
|Customizable VM Instances||Yes||Yes|
|Encrypted Communication||Yes ✝||Yes ✝|
|Encrypted Data at-rest||n/a||n/a|
|Long-lived Canaries||n/a||Replication Canary|
(*) vSphere and AWS (1.8.0-edge.15 and later)
(✝) Requires IPSEC BOSH plug-in
When deployed in HA topology, MySQL for PCF runs three master nodes. This cluster arrangement imposes some limitations that you should be aware of, which do not apply to single-node MySQL database servers.
- Although two proxy instances are deployed by default, there is no automation to direct clients from one to the other. See the note in the Proxy section, as well as the entry in Known Issues.
- MySQL for PCF only supports the InnoDB storage engine; it is the default storage engine for new tables. Pre-existing tables that are not InnoDB are at risk because they are not replicated within a cluster.
- The database servers are shared, managed by multi-tenant processes to serve apps across the PCF deployment. Although data is securely isolated between tenants using unique credentials, app performance may be impacted by noisy neighbors.
- Round-trip latency between database nodes must be less than five seconds. Latency exceeding this results in a network partition. If more than half of the nodes are partitioned, the cluster loses quorum and become unusable until manually bootstrapped.
- See also the list of Known Limitations in MariaDB cluster.
Consult the Release Notes for information about changes between versions of this product.
Consult the Known Issues topic for information about issues in current releases of MySQL for PCF.
Please provide any bugs, feature requests, or questions to the Pivotal Cloud Foundry Feedback list.