To make your ssh client ignore your configuration file, use ssh -F /dev/null [email protected]. Because your subnet's IdentityFile is in /.ssh/foo rather than /.ssh/, you don't need to whip up a whole new file to eschew your extant private key. From the ssh man page: -F configfile Specifies an alternative per-user configuration file. Termux was one of the most promising SSH clients available, but I wanted something that felt more natural on a mobile. Split APKs: config.ar, config.de. The /etc/ssh/sshconfig file is the SSH client configuration file. If it doesn't exit it may prevent some SSH client features from working properly. Regarding your question, you can simply create it and it will work if you only know how to configure it and what permissions to assign into it. Ssh/config This is the per-user configuration file. The format of this file is described above.
If you are doing administrator work or need to connect regularly the multiple remote systems via SSH, it is difficult to remember all the remote IP addresses, usernames and ports. For this problem there is a simple solution is to using OpenSSH set up a per-user configuration file and store different SSH options for each remote system. This article explains basics of the SSH client config file.
Prerequisites#
Make sure you have installed OpenSSH on your machine.
SSH Config File Location#
OpenSSH client config file is located at
.ssh
directory under user’s home directory with name config
. If this directory not exists it will be creates when the user first time run ssh command. You also can create using the following command, if not exists:Generally, by default SSH configuration file is not exists you can create using touch command:
The file must be readable and writable only by the user and other’s can not do access:
SSH Config File Structure#
Following is the basic structure of the SSH config file:
The contents of the config file organized section wise and each section starts with the
Host
directive and contains specific SSH options that are used when establishing a connection with the remote SSH server. You can set indent in file so it will be easy to manage.The
Host
directive can contain one pattern or a whitespace-separated list of patterns. Each pattern can contain zero or more non-whitespace character or one of the following pattern specifiers:*
– Matches zero or more characters. For example,Host *
matches all hosts, while102.102.0.*
matches hosts in the102.102.0.0/24
subnet.?
– Matches exactly one character. The pattern, Host102.102.0.?
matches all hosts in102.102.0.[0-9]
range.!
– When used at the start of a pattern, it negates the match. For example, Host102.102.0.* !102.102.0.5
matches any host in the102.102.0.0/24
subnet except102.102.0.5
.
The SSH client reads the configuration file section by section, and if more than one patterns match, the options from the first matching section take precedence.
To get the full list of available ssh options by typing
man ssh_config
in your terminal or by visiting the ssh_config man page.The scp , sftp , and rsync programs can read the SSH config files.
SSH Config File Example#
Let’s have a look at the following example:
Generally, to connect a remote server via SSH you should specify the remote usernames, hostname, and port. For instance, to log in as user name
kunj
to the host 192.168.1.102
on port 456
from the command line, type:Ssh Config File Examples
This is little bit difficult to remember each option so you can connect simply typing the
ssh devserver
, add the following lines to your ~/.ssh/config
file:Once you type the
ssh devserver
, the ssh client will read the configuration file and use the connection options which are specified for the devserver
section:Mac users interested in Final cut pro 7 trial generally download: PluralEyes for Final Cut Pro 1.2 PluralEyes® works with your favorite video editing tool to instantly sync all of your multi-camera video and audio tracks – eliminating complicated camera set-ups. Final cut pro 7 free download.
Shared SSH Config File Example#
This example gives more detailed information about the host patterns and option precedence.
Let’s take the following example file:
On type the ssh
kunjyen
, the ssh client will read the file and find the first match and apply. In our example, it is Host kunjyen
. After that it will checks for next section one by one for matching pattern. The next matching one is Host * !kavyaell
and it will apply the connection option from this section. The last section Host *
also matches, but the ssh client will take only the Compression option because the User option is already defined in the Host kunjyen
section.The full list of options used when you type
ssh kunjyen
is as follows:When running
ssh kunjell
the matching host patterns are: Host kunjell
, Host *ell
, Host * !kavyaell
and Host *
. The options used in this case are:If you run
ssh kavyaell
, the matching host patterns are: Host kavyaell
, Host *ell
and Host *
. The options used in this case are:Override SSH Config File Option#
In following order the ssh client reads the configuration:
- The options which are specified from the command line.
- Options defined in the
~/.ssh/config
file. - Options defined in the
/etc/ssh/ssh_config
.
To override a single option, you can specify it on the command line. For example, if you have the following definition:
If you want to use all other options but to login as
root
user instead of kunj
, you just need to specify the user on the command line:No Ssh Config File Extension
To tell the ssh client to ignore all of the options specified in the ssh configuration file, use:
Ssh Config File Password
Conclusion#
This article explained how to configure your user in ssh config file. You can also set up SSH key-based authentication and connect to your Linux servers without entering a password.
To add an extra layer to your server you can change the default SSH Port. By default, SSH listen on port
22
.If our content helps you, please consider buying us a coffee
Thank you for your support.
Make SSH easy by adding entries to your local SSH config file. From this file we can set useful defaults to make logging into remote servers as easy as
ssh myserver
.In the previous video, we used this long command to login with a newly created SSH key:Locally on my Mac, I can create/edit an ssh config file:
Add the following to mirror our long command:
Save and exit that file, and try to login in our simpler way:
We can use this with any SSH-based tool:
Ssh Config File Windows 10
See the man page of
ssh
to check out all the options you can use in the config file.