ssh-keygen.md

SSH Key Generation

ED25519 시그니처로 생성

ssh-keygen -t ed25519 -f $HOME/.ssh/github_ed25519 -N ""

Private Key

cat $HOME/.ssh/github_ed25519

-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACDEMj19nGBUWhbXdTbgiZ/nDxygP6fMN4+qKNICl6ktQQAAALCKTeb7ik3m
+wAAAAtzc2gtZWQyNTUxOQAAACDEMj19nGBUWhbXdTbgiZ/nDxygP6fMN4+qKNICl6ktQQ
AAAEDxx/f7ZSN+wswJcGo/RcLZ1Nvj0hGfQu3JgY1UHmgwBsQyPX2cYFRaFtd1NuCJn+cP
HKA/p8w3j6oo0gKXqS1BAAAAJmF1dG93aW5pQGF1dG93aW5pdWktTWFjQm9va1Byby00Lm
xvY2FsAQIDBAUGBw==
-----END OPENSSH PRIVATE KEY-----

Public Key

cat $HOME/.ssh/bitbucket_ed25519.pub

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMQyPX2cYFRaFtd1NuCJn+cPHKA/p8w3j6oo0gKXqS1B comment

RSA 시그니처로 생성

ssh-keygen -t rsa -b 4096 -f $HOME/.ssh/github_rsa -C "comment" -N ""

에러

Add correct host key in /home/markruler/.ssh/known_hosts

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
[...].
Please contact your system administrator.
Add correct host key in /home/markruler/.ssh/known_hosts to get rid of this message.
Offending RSA key in /home/markruler/.ssh/known_hosts:86
RSA host key for [...] has changed and you have requested strict checking.
Host key verification failed.

• 해결1: Removes all keys belonging to the specified hostname (with optional port number) from a known_hosts file.

ssh-keygen -R <ip_address_or_hostname>[:port]

• 해결2: ssh-keyscan으로 known_hosts 파일을 갱신한다. (SO321167)

ssh-keyscan <ip_address_or_hostname>[:port] >> ~/.ssh/known_hosts