78 Zeilen
2,1 KiB
Markdown
78 Zeilen
2,1 KiB
Markdown
Enable Rsyslog to receive logs on 524/tcp:
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```
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# This setting depends on your Rsyslog version and configuration format.
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# For most Debian derivates it will work like this...
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$ModLoad imtcp
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$TCPServerAddress 127.0.0.1
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$InputTCPServerRun 524
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# ...while for Ubuntu 16.04 it looks like this:
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module(load="imtcp")
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input(type="imtcp" address="127.0.0.1" port="524")
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# No matter your Rsyslog version, you should set this option to off
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# if you plan to use Fail2ban
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$RepeatedMsgReduction off
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```
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Restart rsyslog after enabling the TCP listener.
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Now setup Docker daemon to start with the syslog driver.
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This enables the syslog driver for all containers!
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Debian users can change the startup configuration in `/etc/default/docker` while CentOS users find it in `/etc/sysconfig/docker`:
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```
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...
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DOCKER_OPTS="--log-driver=syslog --log-opt syslog-address=tcp://127.0.0.1:524"
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...
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```
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!!! warning
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For some reason Ubuntu 16.04 and some, but not all, systemd based distros do not read the defaults file parameters.
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Just run `systemctl edit docker.service` and add the following content to fix it.
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!!! info
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If "systemctl edit" is not available, just copy the content to `/etc/systemd/system/docker.service.d/override.conf`.
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The first empty ExecStart parameter is not a mistake.
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```
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[Service]
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EnvironmentFile=/etc/default/docker
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ExecStart=
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ExecStart=/usr/bin/docker daemon -H fd:// $DOCKER_OPTS
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```
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Restart the Docker daemon and run `docker-compose down && docker-compose up -d` to recreate the containers.
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### Fail2ban
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**This is a subsection of "Log to Syslog", which is required for Fail2ban to work.**
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Open `/etc/fail2ban/filter.d/common.conf` and search for the prefix_line parameter, change it to ".*":
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```
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__prefix_line = .*
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```
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Create `/etc/fail2ban/jail.d/dovecot.conf`...
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```
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[dovecot]
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enabled = true
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filter = dovecot
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logpath = /var/log/syslog
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chain = FORWARD
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```
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and `jail.d/postfix-sasl.conf`:
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```
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[postfix-sasl]
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enabled = true
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filter = postfix-sasl
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logpath = /var/log/syslog
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chain = FORWARD
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```
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Restart Fail2ban.
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