ssh基于key验证的实战

PASS=123
#设置网段最后的地址，4-255之间，越小扫描越快
END=254

IP=`ip a s eth0 | awk -F'[ /]+' 'NR==3{print $3}'`
NET=${IP%.*}.

. /etc/os-release

rm -f /root/.ssh/id_rsa
[ -e ./SCANIP.log ] && rm -f SCANIP.log

for((i=3;i<="$END";i++));do
    ping -c 1 -w 1  ${NET}$i &> /dev/null  && echo "${NET}$i" >> SCANIP.log &
done
wait

ssh-keygen -P "" -f /root/.ssh/id_rsa
if [ $ID = "centos" -o $ID = "rocky" ];then
    rpm -q sshpass || yum -y install sshpass
else
    dpkg -i sshpass &> /dev/null || apt -y install sshpass
fi

sshpass -p $PASS ssh-copy-id -o StrictHostKeyChecking=no $IP 

AliveIP=(`cat SCANIP.log`)
for n in ${AliveIP[*]};do
    sshpass -p $PASS scp -o StrictHostKeyChecking=no -r /root/.ssh root@${n}:
done

#把.ssh/known_hosts拷贝到所有主机，使它们第一次互相访问时不需要输入回车
for n in ${AliveIP[*]};do
    scp /root/.ssh/known_hosts ${n}:.ssh/
done