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The OpenVZ software allows you to flexibly configure various settings for the OpenVZ system in general as well as for each and every Container. Among these settings are disk and user quota, network parameters, default file locations and configuration sample files, and others.
OpenVZ stores the configuration information in two types of files: the global configuration file <code>/etc/vz/vz.conf</code> and Container configuration files <code>/etc/vz/conf/''CTID''.conf</code>. The global configuration file defines global and default parameters for Container operation, for example, logging settings, enabling and disabling disk quota for Containers, the default configuration file and OS template on the basis of which a new Container is created, and so on. On the other hand, a Container configuration file defines the parameters for a given particular Container, such as disk quota and allocated resources limits, IP address and host name, and so on. In case a parameter is configured both in the global OpenVZ configuration file, and in the Container configuration file, the Container configuration file takes precedence. For a list of parameters constituting the global configuration file and the Container configuration files, see {{man|vz.conf|5}} and {{man|vpsctid.conf|5}} manual pages.
The configuration files are read when the OpenVZ software and/or Containers are started. However, OpenVZ standard utilities, for example, <code>vzctl</code>, allow you to change many configuration settings "on-the-fly", either without modifying the corresponding configuration files or with their modification (if you want the changes to apply the next time The OpenVZ software and/or Containers are started).