SSH

互通
ssh-keygen
ssh-copy-id -i dd
scp -r .ssh nd1:~
#for ((x=1;x<=3;x++));do scp -r .ssh dd$x:~ ; done

加快启动SSH
cp /etc/ssh/sshd_config
vi /etc/ssh/sshd_config
GSSAPIAuthentication no
UseDNS no
systemctl restart sshd