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Oracle® JRockit Virtual Edition User's Guide Release 2.0.0 Part Number E22518-01 |
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# 2.4 About the File System of a Virtual Machine

The file system within a virtual machine that was created by using Oracle JRockit Virtual Edition is similar to that in most UNIX-like operating systems. It consists of a single root (`/`) directory.

The virtual disk (of the size defined in the configuration file) is mounted in the root directory. It contains the following files and directories.

- `/jrockitve`: This directory contains the Oracle JRockit JVM files, configuration files for the virtual machine, and files that provide the required kernel capabilities for Oracle JRockit Virtual Edition.

- The Java application files.

  The file structure of the Java application within the virtual machine file system matches the structures of the directories specified in the `<jrockitve-filesystem-imports>` element of the configuration file.

- `VERSION`: This file contains the release numbers of the components of Oracle JRockit Virtual Edition.

You can access the file system within a running virtual machine by using SSH protocol-based clients (SCP and SFTP). For more information, see Chapter 5, "Accessing the File System of a Running Virtual Machine by Using the SSH Protocol."

When a virtual machine is not running, you can access the file system by using the -f (--file) option of the Image Tool.

External clients and processes cannot access the local file system within a virtual machine when the virtual machine is running. They can, however, access shared file storage locations (such as an NFS location) that are defined by using the `-r` `vm_cfg` `add mount` operation of the Image Tool. For more information, see -r (--reconfigure) in Appendix A, "Image Tool Command-Line Option Reference." Before assembling a virtual machine image, you can define NFS locations by using the configuration file. For more information, see the description of mount element in Appendix B, "Configuration File Element Reference."

Notes:

- Oracle JRockit Virtual Edition supports NFS Version 3 only.

- You can set the virtual machine as an NFS client, not as an NFS server. Therefore, you cannot export a file system.

- Oracle JRockit Virtual Edition supports accessing NFS servers through the UDP transport protocol. The current version does not support access through TCP.