On 11 January 2017 at 11:38, Thufir Hawat <hawat.thu...@gmail.com> wrote:
> I'm on Ubuntu 16.04 running on AWS EC2 and thought that fail2ban was
> running, but:
>
>
>
> root@fqdn.subdomain:/var/log#
> root@fqdn.subdomain:/var/log#
> root@fqdn.subdomain:/var/log# systemctl status fail2ban.service
> ● fail2ban.service - Fail2Ban Service
>    Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; vendor
> preset: enabled)
>    Active: inactive (dead) (Result: exit-code) since Wed 2017-01-11 11:29:08
> UTC; 1min 52s ago
>      Docs: man:fail2ban(1)
>   Process: 8804 ExecStart=/usr/bin/fail2ban-client -x start (code=exited,
> status=255)
>
> Jan 11 11:29:08 fqdn.long systemd[1]: fail2ban.service: Control process
> exited, code=exited status=255
> Jan 11 11:29:08 fqdn.long systemd[1]: Failed to start Fail2Ban Service.
> Jan 11 11:29:08 fqdn.long systemd[1]: fail2ban.service: Unit entered failed
> state.
> Jan 11 11:29:08 fqdn.long systemd[1]: fail2ban.service: Failed with result
> 'exit-code'.
> Jan 11 11:29:08 fqdn.long systemd[1]: fail2ban.service: Service hold-off
> time over, scheduling restart.
> Jan 11 11:29:08 fqdn.long systemd[1]: Stopped Fail2Ban Service.
> Jan 11 11:29:08 fqdn.long systemd[1]: fail2ban.service: Start request
> repeated too quickly.
> Jan 11 11:29:08 fqdn.long systemd[1]: Failed to start Fail2Ban Service.
> root@fqdn.subdomain:/var/log#
> root@fqdn.subdomain:/var/log#
> root@fqdn.subdomain:/var/log# systemctl start fail2ban.service
> Job for fail2ban.service failed because the control process exited with
> error code. See "systemctl status fail2ban.service" and "journalctl -xe" for
> details.
> root@fqdn.subdomain:/var/log#
> root@fqdn.subdomain:/var/log# journalctl -xe
> Jan 11 11:31:18 fqdn.long systemd[1]: fail2ban.service: Failed with result
> 'exit-code'.
> Jan 11 11:31:18 fqdn.long systemd[1]: fail2ban.service: Service hold-off
> time over, scheduling restart.
> Jan 11 11:31:18 fqdn.long systemd[1]: Stopped Fail2Ban Service.
> -- Subject: Unit fail2ban.service has finished shutting down
> -- Defined-By: systemd
> -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
> --
> -- Unit fail2ban.service has finished shutting down.
> Jan 11 11:31:18 fqdn.long systemd[1]: Starting Fail2Ban Service...
> -- Subject: Unit fail2ban.service has begun start-up
> -- Defined-By: systemd
> -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
> --
> -- Unit fail2ban.service has begun starting up.
> Jan 11 11:31:18 fqdn.long fail2ban-client[8834]: ERROR  Failed
> fqdn.subdomaining configuration: While reading from '/etc/fail2ban/jail.co
> Jan 11 11:31:18 fqdn.long systemd[1]: fail2ban.service: Control process
> exited, code=exited status=255
> Jan 11 11:31:18 fqdn.long systemd[1]: Failed to start Fail2Ban Service.
> -- Subject: Unit fail2ban.service has failed
> -- Defined-By: systemd
> -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
> --
> -- Unit fail2ban.service has failed.
> --
> -- The result is failed.
> Jan 11 11:31:18 fqdn.long systemd[1]: fail2ban.service: Unit entered failed
> state.
> Jan 11 11:31:18 fqdn.long systemd[1]: fail2ban.service: Failed with result
> 'exit-code'.
> Jan 11 11:31:18 fqdn.long systemd[1]: fail2ban.service: Service hold-off
> time over, scheduling restart.
> Jan 11 11:31:18 fqdn.long systemd[1]: Stopped Fail2Ban Service.
> -- Subject: Unit fail2ban.service has finished shutting down
> -- Defined-By: systemd
> -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
> --
> -- Unit fail2ban.service has finished shutting down.
> Jan 11 11:31:18 fqdn.long systemd[1]: fail2ban.service: Start request
> repeated too quickly.
> Jan 11 11:31:18 fqdn.long systemd[1]: Failed to start Fail2Ban Service.
> -- Subject: Unit fail2ban.service has failed
> -- Defined-By: systemd
> -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
> --
> -- Unit fail2ban.service has failed.
> --
> -- The result is failed.
> root@fqdn.subdomain:/var/log#
> root@fqdn.subdomain:/var/log#
>
>
>
> I'm not understanding nor seeing what the problem actually is.  Is there an
> error code I don't see?
>

The problem seems to be indicated here:
Jan 11 11:31:18 fqdn.long fail2ban-client[8834]: ERROR  Failed
fqdn.subdomaining configuration: While reading from
'/etc/fail2ban/jail.co

Looks like a truncated log line, but presumably there is some
misconfiguration in your jail.conf (btw, it is better not to make any
changes in jail.conf but instead use jail.local).

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