目錄
1、ssh-keygen生成公鑰和私鑰
ssh-keygen
直接三次回車，Linux會生成兩個密鑰：公鑰和私鑰
公鑰文件：/root/.ssh/id_rsa.pub
私鑰文件：/root/.ssh/id_rsa
2、查看生成的公鑰和私鑰
cd ~/.ssh/
ll
pwd
# 查看公鑰
cat ~/.ssh/id_rsa.pub
# 查看私鑰
cat ~/.ssh/id_rsa
3、將公鑰發到其他主機上
語法：ssh-copy-id -i ~/.ssh/id_rsa.pub root@remote（遠程ip）
ssh-copy-id -i ~/.ssh/id_rsa.pub root@cdh01
ssh-copy-id -i ~/.ssh/id_rsa.pub root@cdh02
ssh-copy-id -i ~/.ssh/id_rsa.pub root@cdh03
ssh-copy-id -i ~/.ssh/id_rsa.pub root@cdh04
ssh-copy-id -i ~/.ssh/id_rsa.pub root@cdh05
ssh-copy-id -i ~/.ssh/id_rsa.pub root@cdh06
每臺機器發送自己的公鑰給其他機器，按回車鍵輸入root用戶密碼即可
4、給~/.ssh和authorized_keys賦予權限
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
5、ssh 遠程連接到各個節點
ssh cdh01
ssh cdh02
ssh cdh03
ssh cdh04
ssh cdh05
ssh cdh06
6、配置錯誤如何重新配置
（1）進入 ~/.ssh 目錄，查看公鑰配置
cd ~/.ssh/
ll
cat authorized_keys
（2）直接刪除~/.ssh目錄下的所有文件，重新生成authorized_keys
rm -rf ~/.ssh/*
touch ~/.ssh/authorized_keys
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
cd ~/.ssh/
（3）如果還不行就自己把公鑰文件的內容追加到authorized_keys中吧
# 本機執行
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
# 其他機器執行
cat ~/.ssh/id_rsa.pub
# 本機再拷貝上一條命令的公鑰填到echo ""
echo "" >> ~/.ssh/authorized_keys
scp ~/.ssh/authorized_keys root@cdh02:~/.ssh/authorized_keys
scp ~/.ssh/authorized_keys root@cdh03:~/.ssh/authorized_keys
scp ~/.ssh/authorized_keys root@cdh04:~/.ssh/authorized_keys
scp ~/.ssh/authorized_keys root@cdh05:~/.ssh/authorized_keys
scp ~/.ssh/authorized_keys root@cdh06:~/.ssh/authorized_keys