ssh無密碼訪問

 1.在伺服器端（192.168.0.1）產生密鑰
[root@chanjet21 ~]# cd /root/.ssh/
[root@chanjet21 .ssh]# ls
known_hosts
[root@chanjet21 .ssh]# ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_dsa.
Your public key has been saved in /root/.ssh/id_dsa.pub.
The key fingerprint is:
26:67:d7:2c:27:8f:01:ea:a6:6c:34:d3:9d:04:ac:08 root@chanjet21
[root@chanjet21 .ssh]# ls
id_dsa  id_dsa.pub  known_hosts
於是產生了id_dsa  id_dsa.pub兩個檔案。
2. #cp id_sda.pub authorized_keys
3.然後將.ssh檔案夾拷貝覆蓋各個節點間.ssh目錄
[root@chanjet21 .ssh]# scp -r /root/.ssh/ root@192.168.0.2:/root/
[root@chanjet21 .ssh]# scp -r /root/.ssh/ root@192.168.0.3:/root/
[root@chanjet21 .ssh]# scp -r /root/.ssh/ root@192.168.0.4:/root/
此時便可從伺服器端無需密碼就可以登入到各個節點。