SSH client and SSH server configuration files (2024)

For OpenSSH, the SSH client user configuration file is named config, and the SSH client system-wide configuration file is named ssh_config. The files reside at the following locations:

  • User configuration file location: $HOME/.ssh/config

  • System-wide configuration file default location: /etc/ssh/ssh_config

    An SSH client obtains its configurations from the ssh command-line options, the user configuration file, and the system-wide configuration file, in that order. For each parameter, the SSH client uses the first obtained value for that parameter.

    Because of the potential for abuse, the config file must have strict permissions: read/write for the user, and not accessible by others. From the $HOME directory, executing the following UNIX command acquires these permissions:

     chmod go-rwx .ssh/* 

    The ssh_config file provides defaults for those values that are not specified in the config file. This file must be world-readable.

    The SSH server has its own set of configuration files, including the SSH server system-wide configuration file named sshd_config. By default, these files reside in the /etc/ssh directory on the remote host.

    The configuration files enable an administrator to set parameters that modify the operation of the SSH client and the SSH server.

SSH client and SSH server configuration files (10)

SSH client and SSH server configuration files (11)

SSH client and SSH server configuration files (2024)

FAQs

What are the configuration files for SSH server? ›

The ssh program on a host receives its configuration from either the command line or from configuration files ~/. ssh/config and /etc/ssh/ssh_config . Command-line options take precedence over configuration files. The user-specific configuration file ~/.

What should be in the SSH config file? ›

The SSH config file is divided into Host sections with specific configuration options for every host. The argument is the exact hostname, IP address, or a match pattern. Use whitespace as a separator between parameters and arguments or an equals sign ( = ).

What are the mandatory configurations required for SSH to work? ›

For SSH to work, the switch needs an Rivest, Shamir, and Adleman (RSA) public/private key pair. This is the same with Secure Copy Protocol (SCP), which relies on SSH for its secure transport.

How to configure SSH server and client in Linux? ›

To configure SSH on Linux:

Install OpenSSH by opening a terminal and running the following commands with super user permissions. If you have firewall, open the SSH port in your firewall. For example, port 22. Navigate to /opt/MicroStrategy/ServicesRegistration/yaml/ and open the installation_list.

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