Backup is failing due to bad HTTPS

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@pfaffman That commit basically broke my minio discourse s3 backup today after upgrading to the latest (2.3.0-beta6). The following resolved it after spending 2 hours fixing it:

  • Add a DNS entry for your backup-bucket-name.backup.example.com.
  • Add a MINIO_DOMAIN environment variable to your /etc/default/minio file.
    MINIO_DOMAIN="backup.example.com,backup-bucket-name.backup.example.com"
  • In case you are using Let’s Encrypt for minio SSL certificates:
    • Expand your SSL certificate by adding another -m backup-bucket-name.backup.example.com certbot command argument.
    • Restart minio service after copying / symlinking your SSL certificates.
      systemctl restart minio
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