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Docker Mailserver
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Security | Fail2Ban
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docker-mailserver
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Configuration
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User Management
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Best Practices
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DKIM
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DMARC
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SPF
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Security
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Security
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Understanding the Ports
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SSL/TLS
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Fail2Ban
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Troubleshooting
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Troubleshooting
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Debugging
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Mail Delivery with POP3
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Advanced Configuration
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Advanced Configuration
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Optional Configuration
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Maintenance
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Maintenance
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< h1 > Fail2Ban< / h1 >
< p > Fail2Ban is installed automatically and bans IP addresses for 3 hours after 3 failed attempts in 10 minutes by default. If you want to change this, you can easily edit < a href = "https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-jail.cf" > < code > config/fail2ban-jail.cf< / code > < / a > .< / p >
< p > You can do the same with the values from < code > fail2ban.conf< / code > , e.g < code > dbpurgeage< / code > . In that case you need to edit < a href = "https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-fail2ban.cf" > < code > config/fail2ban-fail2ban.cf< / code > < / a > .< / p >
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< p class = "admonition-title" > Attention< / p >
< p > The mail container must be launched with the < code > NET_ADMIN< / code > capability in order to be able to install the iptable rules that actually ban IP addresses.< / p >
< p > Thus either include < code > --cap-add=NET_ADMIN< / code > in the docker run commandline or the equivalent < code > docker-compose.yml< / code > :< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > cap_add< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > NET_ADMIN< / span >
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< p > If you don't you will see errors the form of:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "go" > iptables -w -X f2b-postfix -- stderr: " getsockopt failed strangely: Operation not permitted\niptables v1.4.21: can' t initialize iptabl< / span >
< span class = "go" > es table `filter' : Permission denied (you must be root)\nPerhaps iptables or your kernel needs to be upgraded.\niptables v1.4.21: can' < / span >
< span class = "go" > t initialize iptables table `filter' : Permission denied (you must be root)\nPerhaps iptables or your kernel needs to be upgraded.\n" < / span >
< span class = "go" > 2016-06-01 00:53:51,284 fail2ban.action [678]: ERROR iptables -w -D INPUT -p tcp -m multiport --dports smtp,465,submission -< / span >
< span class = "go" > j f2b-postfix< / span >
< / code > < / pre > < / div >
< p > You can also manage and list the banned IPs with the < a href = "../../setup.sh/" > < code > setup.sh< / code > < / a > script.< / p >
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