Difference between revisions of "Ssh (OpenSSH client)"

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{{lowercase}}
 
<code>ssh</code><ref>http://man7.org/linux/man-pages/man1/ssh.1.html</ref> is the [[OpenSSH]] [[ssh clients|ssh client]] for logging or executing commands into remote devices/machines
 
<code>ssh</code><ref>http://man7.org/linux/man-pages/man1/ssh.1.html</ref> is the [[OpenSSH]] [[ssh clients|ssh client]] for logging or executing commands into remote devices/machines
 +
* Man page: https://linux.die.net/man/1/ssh
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* <code>[[ssh --help]]</code>
  
 +
      ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
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        [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11] [-i identity_file] [-J destination] [-L address]
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        [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address] [-S ctl_path]
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        [-W host:port] [-w local_tun[:remote_tun]] destination [command]
 +
 +
* <code>-X Enables X11 [[forwarding]]</code>
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* <code>-N Do not execute a [[remote command]]. This is usefull for just [[forwarding]] ports</code>
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* <code>[[ssh -vvv]]</code>
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* <code>[[ssh -V]]</code>
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* <code>[[ssh -t]]</code>
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* <code>[[ssh -O]]</code>
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* <code>ssh -o ConnectTimeout=100</code>
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* <code>[[ssh -i]]</code>
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* <code>[[ssh -L]]</code>
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* <code>[[ssh -R]]</code>
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 +
Windows: Settings > Apps and click “Manage optional features” under Apps & features.
 +
 +
== Configuration ==
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* Configuration file: <code>[[~/.ssh/config]]</code>
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* <code>[[~/.ssh/environment]]</code>
  
 
== Usage ==
 
== Usage ==
−
* <code>[[ssh]] REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP</code>
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* <code>[[ssh]] remote_User@server_Name_Or_IP</code>
−
* <code>[[ssh]] -vvv REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP</code> (<code>-v</code> increase verbosity, maximum 3)
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* <code>ssh  [email protected] -p 1111 [[-i]] ./yourprivkey</code>
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* <code>[[ssh -vvv]] REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP</code> (<code>-v</code> increase verbosity, maximum 3)
 
** <code>[[ssh]] -vvv REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP 2>&1 | grep "STRING_TO_SEARCH" </code>  
 
** <code>[[ssh]] -vvv REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP 2>&1 | grep "STRING_TO_SEARCH" </code>  
 +
Execute a remote command:
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* <code>ssh USERNAME@SERVER_NAME  '/path/to/remote/scripts/backup.[[sh]]'</code>
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* <code>[[ssh -Q]] kex SERVER</code>
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 +
== Example commands ==
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* <code>ssh -o [[StrictHostKeyChecking]]=accept-new [email protected]</code> (since [[OpenSSH 7.5]], March 2017)
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* <code>ssh -o StrictHostKeyChecking=no [email protected]</code><ref>https://serverfault.com/a/132973</ref>
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* <code>ssh -Q [[kex]] SERVER</code>
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* <code>ssh -o [[MACs]]=[[hmac-sha2-256]] HOSTNAME</code>
  
−
=== Multiplexing options ===
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== [[Multiplexing]] options ==
−
<pre>ssh -O check server.example.org or ssh -O check [email protected]  
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[[ssh -O]] check server.example.org or ssh -O check [email protected]  
−
Master running (pid=26289)
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Master running (pid=26289)
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</pre>
 
  
−
<pre>
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ssh -O check [email protected]  
−
ssh -O check [email protected]  
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Control socket connect(/path/): No such file or directory
−
Control socket connect(/path/): No such file or directory
 
−
</pre>
 
  
 
To stop an specific multiplexed session:
 
To stop an specific multiplexed session:
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<pre>ssh -O stop [email protected]</pre>
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:<code>[[ssh -O stop]] [email protected]</code>
  
 
Avoid using Multiplexing for a connections:
 
Avoid using Multiplexing for a connections:
−
<pre>
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:<code>ssh -o "ControlMaster=no" server.example.org</code>
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ssh -o "ControlMaster=no" server.example.org
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−
</pre>
 
  
 
See also: [[Configure OpenSSH to reuse ssh connections]]
 
See also: [[Configure OpenSSH to reuse ssh connections]]
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 +
== Logs ==
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[[ssh -i]] id_ed25519_xxxxx.pub SERVER_NAME
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Load key "id_ed25519_xxxxx.pub": invalid format
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Solution:
 +
Use private key instead of public key <ref>https://stackoverflow.com/a/48330113</ref>
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ssh -i id_ed25519_xxxxx SERVER_NAME
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* <code>[[Unable to negotiate with]] ([[KexAlgorithms]])</code>
  
 
== Activities ==
 
== Activities ==
 
* Understand differences between stop and exit: <code>ssh -O exit [email protected]</code>
 
* Understand differences between stop and exit: <code>ssh -O exit [email protected]</code>
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* [[Configure OpenSSH to reuse ssh connections]]
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* [[Execute a command in parallel by ssh]]
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* <code>[[ssh]] -o [[PreferredAuthentications]]=keyboard-interactive -o [[PubkeyAuthentication]]=no host1.example.org</code>
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* [[Reverse SSH tunneling]]
  
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== Configuration ==
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* <code>[[CheckHostIP]]</code>
  
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== Related ==
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* <code>[[gcloud compute ssh]]</code>
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* [[Load key ... invalid format]]
  
 
== See also ==
 
== See also ==
−
* {{OpenSSH}}
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* {{ssh (openSSH)}}
−
* [[ncat]]
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* {{ssh clients}}
−
* [[tmux]]
 
  
 
[[Category:Networking]]
 
[[Category:Networking]]
 
[[Category:Linux]]
 
[[Category:Linux]]

Latest revision as of 13:54, 14 July 2023

ssh[1] is the OpenSSH ssh client for logging or executing commands into remote devices/machines 

     ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
        [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11] [-i identity_file] [-J destination] [-L address]
        [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address] [-S ctl_path]
        [-W host:port] [-w local_tun[:remote_tun]] destination [command]

Windows: Settings > Apps and click “Manage optional features” under Apps & features.

Configuration[edit]

Usage[edit]

  • ssh remote_User@server_Name_Or_IP
  • ssh [email protected] -p 1111 -i ./yourprivkey
  • ssh -vvv REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP (-v increase verbosity, maximum 3)
    • ssh -vvv REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP 2>&1 | grep "STRING_TO_SEARCH"

Execute a remote command:

  • ssh USERNAME@SERVER_NAME '/path/to/remote/scripts/backup.sh'

Example commands[edit]

Multiplexing options[edit]

ssh -O check server.example.org or ssh -O check [email protected] 
Master running (pid=26289)

ssh -O check [email protected] 
Control socket connect(/path/): No such file or directory

To stop an specific multiplexed session:

ssh -O stop [email protected]

Avoid using Multiplexing for a connections:

ssh -o "ControlMaster=no" server.example.org


See also: Configure OpenSSH to reuse ssh connections

Logs[edit]

ssh -i id_ed25519_xxxxx.pub SERVER_NAME
Load key "id_ed25519_xxxxx.pub": invalid format
Solution:
Use private key instead of public key [3]
ssh -i id_ed25519_xxxxx SERVER_NAME

Activities[edit]

Configuration[edit]

Related[edit]

See also[edit]

  • ↑ http://man7.org/linux/man-pages/man1/ssh.1.html
  • ↑ https://serverfault.com/a/132973
  • ↑ https://stackoverflow.com/a/48330113
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