[摘自知乎，亲测清晰好使]
安装ansible，取消key检测

yum install ansible -y

vim /etc/ansible/ansible.cfg
host_key_checking = False

[root@test ~]# cat /etc/ansible/hosts
[all:vars]
ansible_ssh_user=root
ansible_ssh_pass=redhat（被控节点账号密码，密码建议设置相同）
[test]
192.168.19.142

生成密钥

ssh-keygen -t rsa
选择文件/root/.ssh/id_rsa
密码就空着
注意前后的变化
[root@test .ssh]# ls
id_rsa id_rsa.pub known_hosts
[root@test .ssh]# ssh-copy-id 192.168.19.148 (ansible管控节点IP)
[root@test .ssh]# ls
authorized_keys id_rsa id_rsa.pub known_hosts
批量推送
ansible all -m authorized_key -a "user=root exclusive=true manage_dir=true key='$(</root/.ssh/authorized_keys)'"

验证

ssh 192.168.19.142