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This training exercise is based on a Debian/Bullseye system running SE Linux in a default configuration in Enforcing mode. To set it up put the following in /usr/local/sbin/adaemon.sh and make it mode 0755: #!/bin/bash echo -100 > /proc/$$/oom_score_adj while true ; do /sbin/runuser -u nobody — /bin/nc -q0 -l -p 4000 < $0 /bin/sleep 1 [...] Basic MTA Configuration All instructions here are for Postfix. If you want to use a different MTA then you will mostly be working without instructions. To install Postfix run “apt install postfix” (or for the preconfigured images I setup reconfigure it by running “rm /etc/postfix/main.cf ; dpkg-reconfigure postfix“. Select “Internet Site” for the type of […] In 2015 I ran a training session on BTRFS and ZFS. Here are the notes for ZFS updated for the latest versions of everything when running on KVM. You can do all the same exercises on a non virtual machine, but it’s safest not to do this on a machine with important data. For the […] In 2015 I ran a training session on BTRFS and ZFS. Here are the notes for BTRFS updated for the latest versions of everything when running on KVM. You can do all the same exercises on a non virtual machine, but it’s safest not to do this on a machine with important data. For the […] |
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