1. Host 192.168.4.5
    2. HostkeyAlgorithms +ssh-rsa
    3. PubkeyAcceptedKeyTypes +ssh-rsa
    4. User mazhuang
    6. Host 192.168.4.6
    7. HostkeyAlgorithms +ssh-rsa
    8. PubkeyAcceptedKeyTypes +ssh-rsa
    9. User mazhuang