# Piemēra fails uzdevumam Z5.3 (kurss par VPS un Linux serveru pārvaldība)
# Serveris "web1" (Debian 13), pieteikšanās tikai ar atslēgām, fail2ban ar maxretry = 5, findtime = 10m, bantime = 1h.
# Izvade no: sudo journalctl -u ssh --since "2026-11-08 03:00" --until "2026-11-08 09:00"
# un pēc tam: sudo fail2ban-client status sshd (plkst. 09:00). Visas adreses ir dokumentācijas adreses.

nov 08 03:12:01 web1 sshd-session[1201]: Invalid user admin from 203.0.113.77 port 40112
nov 08 03:12:01 web1 sshd-session[1201]: Connection closed by invalid user admin 203.0.113.77 port 40112 [preauth]
nov 08 03:12:19 web1 sshd-session[1204]: Invalid user oracle from 203.0.113.77 port 40398
nov 08 03:12:19 web1 sshd-session[1204]: Connection closed by invalid user oracle 203.0.113.77 port 40398 [preauth]
nov 08 03:12:40 web1 sshd-session[1210]: Invalid user test from 203.0.113.77 port 40731
nov 08 03:12:40 web1 sshd-session[1210]: Connection closed by invalid user test 203.0.113.77 port 40731 [preauth]
nov 08 03:13:02 web1 sshd-session[1215]: Invalid user ubuntu from 203.0.113.77 port 41020
nov 08 03:13:02 web1 sshd-session[1215]: Connection closed by invalid user ubuntu 203.0.113.77 port 41020 [preauth]
nov 08 03:13:25 web1 sshd-session[1221]: Invalid user postgres from 203.0.113.77 port 41377
nov 08 03:13:25 web1 sshd-session[1221]: Connection closed by invalid user postgres 203.0.113.77 port 41377 [preauth]
nov 08 03:40:12 web1 sshd-session[1302]: Invalid user admin from 198.51.100.140 port 52210
nov 08 03:40:12 web1 sshd-session[1302]: Connection closed by invalid user admin 198.51.100.140 port 52210 [preauth]
nov 08 04:05:44 web1 sshd-session[1350]: Invalid user admin from 198.51.100.140 port 52918
nov 08 04:05:44 web1 sshd-session[1350]: Connection closed by invalid user admin 198.51.100.140 port 52918 [preauth]
nov 08 04:31:09 web1 sshd-session[1399]: Invalid user admin from 198.51.100.140 port 53604
nov 08 04:31:09 web1 sshd-session[1399]: Connection closed by invalid user admin 198.51.100.140 port 53604 [preauth]
nov 08 04:56:30 web1 sshd-session[1441]: Invalid user admin from 198.51.100.140 port 54280
nov 08 04:56:30 web1 sshd-session[1441]: Connection closed by invalid user admin 198.51.100.140 port 54280 [preauth]
nov 08 05:21:58 web1 sshd-session[1490]: Invalid user admin from 198.51.100.140 port 55007
nov 08 05:21:58 web1 sshd-session[1490]: Connection closed by invalid user admin 198.51.100.140 port 55007 [preauth]
nov 08 05:47:21 web1 sshd-session[1532]: Invalid user admin from 198.51.100.140 port 55689
nov 08 05:47:21 web1 sshd-session[1532]: Connection closed by invalid user admin 198.51.100.140 port 55689 [preauth]
nov 08 06:58:03 web1 sshd-session[1604]: Connection closed by authenticating user root 198.51.100.7 port 61002 [preauth]
nov 08 08:31:47 web1 sshd-session[1688]: Accepted publickey for anna from 192.0.2.55 port 50122 ssh2: ED25519 SHA256:q3Vb0Yx8cXk2pR7mW1sTnH4dJ9eLfA6uZ5oGiC2vBQs
nov 08 08:31:47 web1 sshd-session[1688]: pam_unix(sshd:session): session opened for user anna(uid=1000) by anna(uid=0)

anna@web1:~$ sudo fail2ban-client status sshd
Status for the jail: sshd
|- Filter
|  |- Currently failed: 1
|  |- Total failed:     11
|  `- Journal matches:  _SYSTEMD_UNIT=ssh.service + _COMM=sshd
`- Actions
   |- Currently banned: 0
   |- Total banned:     1
   `- Banned IP list:

anna@web1:~$ sudo grep -E "Ban|Unban" /var/log/fail2ban.log | tail -n 2
2026-11-08 03:13:26,004 fail2ban.actions        [811]: NOTICE  [sshd] Ban 203.0.113.77
2026-11-08 04:13:26,117 fail2ban.actions        [811]: NOTICE  [sshd] Unban 203.0.113.77

Jautājumi:
1. Kura adrese izmēģināja visvairāk dažādu lietotājvārdu?
2. Kura adrese veiksmīgi pieteicās, un kā kurš lietotājs?
3. Kura adrese tika bloķēta, un cikos (hh:mm)?
4. Kura adrese veica vairāk nekā piecus neveiksmīgus mēģinājumus, bet netika bloķēta?
5. Kāpēc šī adrese netika bloķēta?
   a. Adrese bija norādīta ignoreip
   b. Starp mēģinājumiem bija vairāk nekā desmit minūtes (findtime), tāpēc desmit minūšu laikā nekad nebija pieci mēģinājumi
   c. fail2ban bija izslēgts laikā no 03:40 līdz 06:00
   d. Mēģinājumi ar vārdu admin netiek skaitīti