Author: Steff
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Basic Linux server firewall
Somehow I never feel that my servers are protected well enough and probably they actually never will be 🙂
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Replication of mailboxes
Operating your own mail server has advantages (like the feeling that you can do 😄) it but also brings up some additional workload. There is a huge difference between a backup and a high-availability solution. Backing up your mailboxes is easy, but a an outage tends to come up when you least expect it and…
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Using GeoIP to limit access to services
It’s been a while that I started to use GeoIP and in the last years it seems that the methods of installing GeoIP changed, including the registration. The service is still free and my recommendation is to install it from the according sources of your Linux distribution. For my Debian 11 this was easily done:…
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Backup script for hosted Linux
It takes not much time to initially setup a Linux machine with a hosting provider, but it takes a lot of time to configure it… Backup of my precious databases and configuration is pretty essential. I learned that the hard way… So I created a simple script for my servers which simply puts all precious…
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Postfix with multiple SSL certificates
Since a very long time I am a big fan of hosting my mails one one of my virtual machines in the cloud instead of using a public provider. I am also using some hosted providers, but the majority of my mailboxes is hosted in my own environment. There is an incredible good description of…
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CARP with DHCP (kind of…)
CARP is a wonderful way to setup a high availability environment for two firewalls. There is a pretty good documentation at the OPNsense documentation in case you don’t want to annoy your family during upgrades, tests,… But of course there a limitations – you need a fixed IP for the WAN interface and it must…