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
 +
* <code>[[ssh --help]]</code>
  
 
       ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
 
       ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
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         [-W host:port] [-w local_tun[:remote_tun]] destination [command]
 
         [-W host:port] [-w local_tun[:remote_tun]] destination [command]
  
−
-X Enables X11 forwarding
+
* <code>-X Enables X11 [[forwarding]]</code>
−
 
+
* <code>-N Do not execute a [[remote command]]. This is usefull for just [[forwarding]] ports</code>
 +
* <code>[[ssh -vvv]]</code>
 
* <code>[[ssh -V]]</code>
 
* <code>[[ssh -V]]</code>
 
* <code>[[ssh -t]]</code>
 
* <code>[[ssh -t]]</code>
−
 
+
* <code>[[ssh -O]]</code>
 +
* <code>ssh -o ConnectTimeout=100</code>
 +
* <code>[[ssh -i]]</code>
 +
* <code>[[ssh -L]]</code>
 +
* <code>[[ssh -R]]</code>
  
 
Windows: Settings > Apps and click “Manage optional features” under Apps & features.
 
Windows: Settings > Apps and click “Manage optional features” under Apps & features.
  
 
== Configuration ==
 
== Configuration ==
−
* Configuration file: <code>~/.ssh/[[config]]</code>
+
* Configuration file: <code>[[~/.ssh/config]]</code>
 +
* <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)
+
* <code>ssh  [email protected] -p 1111 [[-i]] ./yourprivkey</code>
 +
* <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:
 
Execute a remote command:
 
* <code>ssh USERNAME@SERVER_NAME  '/path/to/remote/scripts/backup.[[sh]]'</code>
 
* <code>ssh USERNAME@SERVER_NAME  '/path/to/remote/scripts/backup.[[sh]]'</code>
  
−
* <code>ssh -Q kex SERVER</code>
+
* <code>[[ssh -Q]] kex SERVER</code>
−
 
 
  
 
== Example commands ==
 
== Example commands ==
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* <code>ssh -o StrictHostKeyChecking=no [email protected]</code><ref>https://serverfault.com/a/132973</ref>
 
* <code>ssh -o StrictHostKeyChecking=no [email protected]</code><ref>https://serverfault.com/a/132973</ref>
 
* <code>ssh -Q [[kex]] SERVER</code>
 
* <code>ssh -Q [[kex]] SERVER</code>
−
* <code>ssh -o [[MACs]]=hmac-sha2-256 HOSTNAME</code>
+
* <code>ssh -o [[MACs]]=[[hmac-sha2-256]] HOSTNAME</code>
  
 
== [[Multiplexing]] options ==
 
== [[Multiplexing]] options ==
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== Logs ==
 
== Logs ==
−
  ssh -i id_ed25519_xxxxx.pub SERVER_NAME
+
  [[ssh -i]] id_ed25519_xxxxx.pub SERVER_NAME
 
  Load key "id_ed25519_xxxxx.pub": invalid format
 
  Load key "id_ed25519_xxxxx.pub": invalid format
 
  Solution:
 
  Solution:
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  ssh -i id_ed25519_xxxxx SERVER_NAME
 
  ssh -i id_ed25519_xxxxx SERVER_NAME
  
−
* [[Unable to negotiate with]] ([[KexAlgorithms]])
+
* <code>[[Unable to negotiate with]] ([[KexAlgorithms]])</code>
  
 
== Activities ==
 
== Activities ==
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* [[Configure OpenSSH to reuse ssh connections]]
 
* [[Configure OpenSSH to reuse ssh connections]]
 
* [[Execute a command in parallel by ssh]]
 
* [[Execute a command in parallel by ssh]]
−
* [[ssh]] -o PreferredAuthentications=keyboard-interactive -o [[PubkeyAuthentication]]=no host1.example.org
+
* <code>[[ssh]] -o [[PreferredAuthentications]]=keyboard-interactive -o [[PubkeyAuthentication]]=no host1.example.org</code>
 +
* [[Reverse SSH tunneling]]
  
 
== Configuration ==
 
== Configuration ==
 
* <code>[[CheckHostIP]]</code>
 
* <code>[[CheckHostIP]]</code>
 +
 +
== Related ==
 +
* <code>[[gcloud compute ssh]]</code>
 +
* [[Load key ... invalid format]]
  
 
== See also ==
 
== See also ==
−
* {{OpenSSH}}
+
* {{ssh (openSSH)}}
−
* {{ncat}}
 
−
* {{tmux}}
 
 
* {{ssh clients}}
 
* {{ssh clients}}
  
 
[[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
    • Retrieved from "https://www.wikieduonline.com/index.php?title=Ssh_(OpenSSH_client)&oldid=255997"

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