About Passwordless SSH Configuration

Passwordless SSH configuration is a mandatory installation requirement for Oracle Grid Infrastructure installation to configure cluster member nodes.

Automatic Passwordless SSH configuration using OUI creates RSA encryption keys on all nodes of the cluster. If you have system restrictions that require you to set up SSH manually, such as using DSA keys, then use this procedure as a guide to set up passwordless SSH. If SSH is not available, then Oracle Universal Installer (OUI) attempts to use rcp instead. However, these services are disabled by default on most Linux systems.

To configure SSH, you must first create RSA or DSA keys on each cluster node, and then copy all the keys generated on all cluster node members into an authorized keys file that is identical on each node. Note that the SSH files must be readable only by root and by the software installation user (oracle, grid), as SSH ignores a private key file if it is accessible by others. In the examples that follow, the DSA key is used.

Note:

The supported version of SSH for Linux distributions is OpenSSH.