rm /root/.ssh -fr
ssh-keygen -t rsa 在各个机器上执行
cat /root/.ssh/id_rsa.pub 吧各个机器的这个文件都拷出来，当一个模板用
echo "
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA07DhqapHjfGP6Q1TDW1cageTXXwJixSKEGlwdeAu/W0UUqabK4zC3tezFaqzlhC/Pgp9tTRvV7cvztPRm90vigpaIWSp9loZgLbi23xO6s8/hkOCMiXr8qVAWxJ8rT82wgKJOiiPFgi4HNHxJRutnICcMqXUi8RmEr5/1DVWLs/eNtHh6oHTJeNdI0VTU4Kdsr1tnuvZev0GH6xRPIw/WBDFEqKA4n8M1FI9SpZ76cn/jEuXjIFOW9MzHgGwcHeCGMr2QBORytyojyORYCjHAC2u7dVZo0a23ESeEI5xZqHboyLSQU2KCwDU7s3zzEyTardnhl+isAjOi6do03A4sQ== root@mysql_01.wgq.mha
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAqKu6lQakEllxMFwjhsCOz5+wZMJeJFAhgI1c5rSKwyG/xydw4n9RMddQw9Y1HhFf1cfGbGvKGHfYKCcjpjc8GHsMbAA8HcNRwPlYanPHbc7P38zuUB430h33bUoPIt8QnNKC+ZA77enozK63D1T25bpkhnFxdf+ygOW4gSWAJAgcK2/l1wv82yu6OhX50cLGdZ2eeERKSaIC5M4lcTRgj4G2vCcAGS+PEGvWtXbWt/biUlADUe4BqDqARieVM/LI86r8MMfbEnai0n5M1afOaPtStsHwMNphZe8InsiHumhEWXSVdGHCrYHDm25KNs46ctFQRTvM1hkOlNBkvf+EHw== root@mysql_02.wgq.mha
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAxdtyed3saXWRmREmStfYyzZWshe+OBJrvfB8uutZ6/elIStiujFQ08bav7hFnX9sTNWtdsK9FPzV2kw7Y51nZxPi2U5zgLFxirKn8GunHNn/xm7aXYk1XS7Mf8uHQ4b0pzc6Gj+3F8Z3kZzDDETC17aGZc6jsIbBIGddqEBYYDZbHiEU0NnBu6W7/R4lW2KIyS1ihGY+h93yYQowonQB84T4g8YxeGrlruch9q2jrWITAc5F3vo7zo6irBOF9iTy21yt+hjOxcJ276cuZQblRLPfJjnx7gAkk/1aU9/HFQVf2eadz63z2Pqdx9l+m4N8zhpiKyzBBCFyShwq0EYUrQ== root@mysql_03.wgq.mha
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA0tiLbAwaezQs8aXoNAbmaHpQn7QmYQFMBByPrJm6kQb2QzJg4gM5/hKiYkCl1kMQmN3iKJJhKVfkiq2TkPt2cT/6okXo/yKpHojRlq7BUp8NkrQmaXdxAPHkksUVT22ymxQEQa/a3XOdudfseSiS+wnBHzOFJ2YnqpJBurGC2dWM3fKXSNAuW9qBJ3svYF7fKXoEpZTeuuWNYOAzRD4laHlYluc+ix4tzzLHvMeBDbveG5hMJOhCQt+cPwMsJkTMMkJj1uWPH9ufiAK6bvfFi6jRK3h9pVHtoPKQpkMaqVzNS7WP2by1Wavaf8xrvG00wrbyM3+cSXVsmQMjDpPbjw== root@mysql_04.wgq.mha
" > /root/.ssh/authorized_keys
chmod 644 /root/.ssh/authorized_keys
然后每个机器相互登录二遍就行，第一遍好像是要确定 (yes / no)的，第二遍就可以直接登录
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