昨天我在 DigitalOcean 创建了一个 Ubuntu 18.04 droplet，带有 MongoDB v4.0.2 图像，今天我检查了/var/log/auth.log文件......我看到的是这样的：
Oct 1 16:16:25 mongodb-server-1 sshd[9171]: Failed password for root from 116.31.116.16 port 61535 ssh2
Oct 1 16:16:30 mongodb-server-1 sshd[9171]: message repeated 2 times: [ Failed password for root from 116.31.116.16 port 61535 ssh2]
Oct 1 16:16:30 mongodb-server-1 sshd[9171]: Received disconnect from 116.31.116.16 port 61535:11: [preauth]
Oct 1 16:16:30 mongodb-server-1 sshd[9171]: Disconnected from authenticating user root 116.31.116.16 port 61535 [preauth]
Oct 1 16:16:30 mongodb-server-1 sshd[9171]: PAM 2 more authentication failures; …