1、查看端口被占用的程序
lsof -i:25
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2、修改域名解析
nano /etc/resolv.conf --修改域名配置
/etc/init.d/networking restart --重启网卡
3、SSH传输文件命令
man scp
1. scp /etc/resolv.conf username@B_HOST:/etc/resolv.conf.A
2. scp username@B_HOST:/etc/resolv.conf /etc/resolv.conf.B
3. scp username_on_A@A_HOST:/etc/resolv.conf username_on_B@B_HOST:/etc/resolv.conf.A