¿Cuál es el significado de -i en ssh?

Question

¿Qué -iagrega la etiqueta a un comando como:

ssh -i path-to-pem-file ubuntu@ip-address

Answer 1

Desde la página de manual:

-i identity_file
             Selects a file from which the identity (private key) for public
             key authentication is read.  The default is ~/.ssh/identity for
             protocol version 1, and ~/.ssh/id_dsa, ~/.ssh/id_ecdsa,
             ~/.ssh/id_ed25519 and ~/.ssh/id_rsa for protocol version 2.
             Identity files may also be specified on a per-host basis in the 
             configuration file.  It is possible to have multiple -i options
             (and multiple identities specified in configuration files).  
             If no certificates have been explicitly specified by the
             CertificateFile directive, ssh will also try to load certificate 
             information from the filename obtained by appending -cert.pub to 
             identity filenames.

Básicamente, le dice al comando SSH que mire el archivo de clave que necesita para la autenticación en el servidor de destino. Si utiliza autenticación de clave y se le proporcionó un certificado, aquí es donde desea especificarlo. Si utiliza autenticación de contraseña normal, ignore esa opción.

Además, en el futuro, será más fácil buscar en Google cosas como esta. Dedicarás menos esfuerzo y obtendrás una respuesta más rápido.

Answer 2

Desde elpágina de manual

-i archivo_identidad

   Selects a file from which the identity (private key) for public
   key authentication is read.  The default is ~/.ssh/identity for
   protocol version 1, and ~/.ssh/id_dsa, ~/.ssh/id_ecdsa,
   ~/.ssh/id_ed25519 and ~/.ssh/id_rsa for protocol version 2.
   Identity files may also be specified on a per-host basis in the
   configuration file.  It is possible to have multiple -i options
   (and multiple identities specified in configuration files).  If
   no certificates have been explicitly specified by the
   CertificateFile directive, ssh will also try to load certificate
   information from the filename obtained by appending -cert.pub to
   identity filenames.