After adding the public key to the server, an error is reported

sign_and_send_pubkey: signing failed: agent refused operation

Solution.

　　　　eval
"$(ssh-agent -s)"

　　　　ssh-add

More:

linux shell eval

 

Syntax: eval cmdLine

eval scans the cmdLine twice. If the cmdLine is a normal command after the first scan, it is executed; if the cmdLine contains an indirect reference to a variable, the semantics of the indirect reference is guaranteed.

 

Examples are as follows.

set 11 22 33 44

If you want to output the last parameter, i.e. 44, you can use the following command.

echo $4

But if we don't know how many arguments there are, and we want to output the last argument, we may think of using $# to output the last argument.

If the command is used.

echo "\$$#"

The result is $4, not 44 as we would like, and there is a problem with indirect references to variables.

This is where the eval command can be used.

eval echo "\$$#"

The result is 44

ssh-add command details

Syntax


ssh-add [-cDdLlXx] [-t life] [file ...]

ssh-add -s pkcs11 

ssh-add -e pkcs11

Parameter description

    -D ：Delete all keys from ssh-agent;

    -d : delete the keys from ssh-agent;

    -e : pkcs11 : delete the key provided by PKCS#11 shared library pkcs1;

    -s : pkcs11 : add the keys provided by PKCS#11 shared library pkcs1;

    -L : Show the public key in ssh-agent;

    -l : show the key in the ssh-agent;

    -t : life: set timeout for loaded keys, ssh-agent will automatically unload the keys after the timeout;

    -X : unlock ssh-agent;

    -x : unlock ssh-agent; -x : lock ssh-agent;

Example

Add a special key to the ssh-agent cache

ssh-add /home/chen/.ssh/id_rsa

Remove the key from the ssh-agent

ssh-add -d /home/chen/.ssh/id_rsa.pub

View the key in ssh-agent

ssh-add -l