Sync Proxy is installed by default. Please complete the DNS configuration before starting DR.
    Log in to Sync Proxy EC2 by default. Execute Command:
    Please modify the DNS address according to the actual situation. 
    2. sudo echo -e "\n[Resolve]\nDNS=10.10.0.23" >> /etc/systemd/resolved.conf && systemctl restart systemd-resolved
    4. sudo cat /etc/systemd/resolved.conf
    6. [Resolve]
    7. DNS=10.10.0.23
    Modify the daemon.json file of docker service and add DNS configuration. 
    1. {
    2.   "default-ulimits": {
    3.     "nofile": {
    4.       "Name": "nofile",
    5.       "Hard": 1048576,
    6.       "Soft": 1048576
    7.     }
    8.   },
    9.   "dns": ["127.0.0.53"]
    10. }

    Restart the Docker service.

    1. sudo systemctl retsart docker