обнаружил в логах:
Спойлер
Sep 27 23:01:44 3k304-02 sshd[8720]: Invalid user mysql from 206.253.146.5
Sep 27 23:01:44 3k304-02 sshd[8720]: pam_unix(sshd:auth): check pass; user unknown
Sep 27 23:01:44 3k304-02 sshd[8720]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=amickdsw.amickfarms.com
Sep 27 23:01:46 3k304-02 sshd[8720]: Failed password for invalid user mysql from 206.253.146.5 port 60848 ssh2
Sep 27 23:01:47 3k304-02 sshd[8722]: Invalid user mysql from 206.253.146.5
Sep 27 23:01:47 3k304-02 sshd[8722]: pam_unix(sshd:auth): check pass; user unknown
Sep 27 23:01:47 3k304-02 sshd[8722]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=amickdsw.amickfarms.com
Sep 27 23:01:49 3k304-02 sshd[8722]: Failed password for invalid user mysql from 206.253.146.5 port 60988 ssh2
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Sep 23 07:14:13 3k304-02 sshd[25650]: Failed password for root from 89.97.55.57 port 58641 ssh2
Sep 23 07:14:13 3k304-02 sshd[25652]: Invalid user murray from 89.97.55.57
Sep 23 07:14:13 3k304-02 sshd[25652]: pam_unix(sshd:auth): check pass; user unknown
Sep 23 07:14:13 3k304-02 sshd[25652]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=89-97-55-57.ip16.fastwebnet.it
Sep 23 07:14:15 3k304-02 sshd[25652]: Failed password for invalid user murray from 89.97.55.57 port 58712 ssh2
Sep 23 07:14:16 3k304-02 sshd[25654]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=89-97-55-57.ip16.fastwebnet.it + user=root
Посоветуйте какие адекватные меры можно предпринять
банить руками всех (iptables) по ип замучаешься.....