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# Ubuntu 18.04
sudo vi /etc/ssh/sshd_config

#Port 22
#Port 12345

sudo systemctl restart sshd

如有需要还要设置服务器端防火墙放行设置的端口

客户端配置

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# ~/.ssh/config

Host abc
    Hostname 1.2.3.4
    Port 12345
    User ubuntu