fail2ban 未偵測到 CentOS 7 上的 ssh 故障

Question

我已經在 CentOS 7 上安裝了fail2ban並添加了jail.local：

[sshd]
enabled = true

當我嘗試錯誤的 ssh 登入時，我會在 /var/log/secure 中收到如下日誌條目：

Jun  5 11:09:40 arsenal sshd[32595]: Connection closed by 192.168.1.202 port 61745 [preauth]

但是，除非我將其設為“調試”，否則fail2ban日誌中不會出現任何內容：

2019-06-05 11:09:40,893 fail2ban.filtersystemd  [32110]: DEBUG   Read systemd journal entry: '2019-06-05T11:09:40.893324arsenal sshd[32595]: Connection closed by 192.168.1.202 port 61745 [preauth]'

即使我連續多次嘗試這種錯誤的登錄，它也不會阻止任何內容：

# fail2ban-client status sshd
Status for the jail: sshd
|- Filter
|  |- Currently failed: 0
|  |- Total failed: 0
|  `- Journal matches:  _SYSTEMD_UNIT=sshd.service + _COMM=sshd
`- Actions
   |- Currently banned: 0
   |- Total banned: 0
   `- Banned IP list: