- 17.3 MySQL Cluster Configuration
- 17.3.1 Quick Test Setup of MySQL Cluster
- 17.3.2 MySQL Cluster Configuration Files
- 17.3.2.1 MySQL Cluster Configuration: Basic Example
- 17.3.2.2 Recommended Starting Configuration for MySQL Cluster
- 17.3.2.3 The MySQL Cluster Connectstring
- 17.3.2.4 Defining Computers in a MySQL Cluster
- 17.3.2.5 Defining a MySQL Cluster Management Server
- 17.3.2.6 Defining MySQL Cluster Data Nodes
- 17.3.2.7 Defining SQL and Other API Nodes in a MySQL Cluster
- 17.3.2.8 MySQL Cluster TCP/IP Connections
- 17.3.2.9 MySQL Cluster TCP/IP Connections Using Direct Connections
- 17.3.2.10 MySQL Cluster Shared-Memory Connections
- 17.3.2.11 SCI Transport Connections in MySQL Cluster
- 17.3.2.12 Configuring MySQL Cluster Send Buffer Parameters
- 17.3.3 Overview of MySQL Cluster Configuration Parameters
- 17.3.4 MySQL Server Options and Variables for MySQL Cluster
- 17.3.5 Using High-Speed Interconnects with MySQL Cluster
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- 17.3.2.1. MySQL Cluster Configuration: Basic Example
- 17.3.2.2. Recommended Starting Configuration for MySQL Cluster
- 17.3.2.3. The MySQL Cluster Connectstring
- 17.3.2.4. Defining Computers in a MySQL Cluster
- 17.3.2.5. Defining a MySQL Cluster Management Server
- 17.3.2.6. Defining MySQL Cluster Data Nodes
- 17.3.2.7. Defining SQL and Other API Nodes in a MySQL Cluster
- 17.3.2.8. MySQL Cluster TCP/IP Connections
- 17.3.2.9. MySQL Cluster TCP/IP Connections Using Direct Connections
- 17.3.2.10. MySQL Cluster Shared-Memory Connections
- 17.3.2.11. SCI Transport Connections in MySQL Cluster
- 17.3.2.12. Configuring MySQL Cluster Send Buffer Parameters
Configuring MySQL Cluster requires working with two files:
my.cnf: Specifies options for all MySQL Cluster executables. This file, with which you should be familiar with from previous work with MySQL, must be accessible by each executable running in the cluster.config.ini: This file, sometimes known as the global configuration file, is read only by the MySQL Cluster management server, which then distributes the information contained therein to all processes participating in the cluster.config.inicontains a description of each node involved in the cluster. This includes configuration parameters for data nodes and configuration parameters for connections between all nodes in the cluster. For a quick reference to the sections that can appear in this file, and what sorts of configuration parameters may be placed in each section, see Sections of theconfig.iniFile.
Caching of configuration data. In MySQL Cluster NDB 7.2, MySQL Cluster uses stateful configuration. Rather than reading the global configuration file every time the management server is restarted, the management server caches the configuration the first time it is started, and thereafter, the global configuration file is read only when one of the following conditions is true:
The management server is started using the
--initialoption. In this case, the global configuration file is re-read, any existing cache files are deleted, and the management server creates a new configuration cache.The management server is started using the
--reloadoption. In this case, the management server compares its cache with the global configuration file. If they differ, the management server creates a new configuration cache; any existing configuration cache is preserved, but not used. If the management server's cache and the global configuration file contain the same configuration data, then the existing cache is used, and no new cache is created.The management server is started using a
--config-cacheoption. This option can be used to force the management server to bypass configuration caching altogether. In this case, the management server ignores any configuration files that may be present, always reading its configuration data from theconfig.inifile instead.No configuration cache is found. In this case, the management server reads the global configuration file and creates a cache containing the same configuration data as found in the file.
Configuration cache files.
The management server by default creates configuration cache
files in a directory named mysql-cluster in
the MySQL installation directory. (If you build MySQL Cluster
from source on a Unix system, the default location is
/usr/local/mysql-cluster.) This can be
overridden at runtime by starting the management server with the
--configdir option. Configuration cache files
are binary files named according to the pattern
ndb_,
where node_id_config.bin.seq_idnode_id is the management
server's node ID in the cluster, and
seq_id is a cache idenitifer. Cache
files are numbered sequentially using
seq_id, in the order in which they
are created. The management server uses the latest cache file as
determined by the seq_id.
It is possible to roll back to a previous configuration by
deleting later configuration cache files, or by renaming an
earlier cache file so that it has a higher
seq_id. However, since configuration
cache files are written in a binary format, you should not
attempt to edit their contents by hand.
For more information about the --configdir,
--initial, and --reload options
for the MySQL Cluster management server, see
Section 17.4.4, “ndb_mgmd — The MySQL Cluster Management Server Daemon”.
We are continuously making improvements in Cluster configuration and attempting to simplify this process. Although we strive to maintain backward compatibility, there may be times when introduce an incompatible change. In such cases we will try to let Cluster users know in advance if a change is not backward compatible. If you find such a change and we have not documented it, please report it in the MySQL bugs database using the instructions given in Section 1.7, “How to Report Bugs or Problems”.
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