- run command:
   + firewall-cmd --permanent --zone=public --add-rich-rule='rule family="ipv4" source address="103.81.86.16" port protocol="tcp" port="27017" accept'
- vi /etc/mongod.conf
   # network interfaces
  net:
   port: 27017
   bindIp: 127.0.0.1,mongodb_server_ip


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