今まではキーペアを作る→公開鍵をscpで送る or catで中身コピー→authorized_keysに張り付けとかをやっていたけど、簡単にやってくれるコマンドがあった。
最近知った。便利だね。
#キーペア作成 [root@RAIDER modules]# ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): ←空Enter Created directory '/root/.ssh'. Enter passphrase (empty for no passphrase): ←空Enter Enter same passphrase again: ←空Enter Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: SHA256:uKcCk/BL77rWURFlN53cL9ub6yYuF3DtMR8yAFLE1zk root@RAIDER The key's randomart image is: +---[RSA 2048]----+ | .+*++o.o. | | ...o ++E. | | . . . o. | |. .. . +.=.| | o . .. S o ++=| | * . . ...o| | . * .. . . o| | o + o . o + | | .o+... +.+o.| +----[SHA256]-----+ #PublicKeyの内容を相手先のauthorized_keysに書き込む [root@RAIDER modules]# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.0.45 /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub" The authenticity of host '192.168.0.45 (192.168.0.45)' can't be established. ECDSA key fingerprint is SHA256:KrJXKdVuhtO0CX+cJ3TXpGIvoKaup1VmHMYAg7PDkmg. ECDSA key fingerprint is MD5:e6:74:ab:2f:aa:9e:fe:ae:86:f1:62:51:c1:f6:5e:da. Are you sure you want to continue connecting (yes/no)? yes /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys root@192.168.0.45's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh '192.168.0.45'" and check to make sure that only the key(s) you wanted were added. #ログインしてみる [root@RAIDER modules]# ssh 192.168.0.45 Last login: Fri May 4 04:30:30 2018 from 192.168.0.2 [root@HYPERION ~]#