Essential software for new systems

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Automaattinen sisällysluettelo / Automatically generated Table of Contents

Security

microcode - propietary, but otherwise CPU holes are going to be gaping open. Refer to tail -n +1 /sys/devices/system/cpu/vulnerabilities/*
- Debian calls this as amd64-microcode or intel-microcode
ufw for Deb-based or firewalld on Fedora
sshguard for mitigating shared systems where others refuse to use keys
needrestart for knowing when updates actually require services to be restarted or a kernel upgrade happens and requires reboot
molly-guard so you won’t accidentally reboot or poweroff production rather than local machine.
apt-listchanges changelogs are worth knowing when updating.
apt-listbugs known bugs are especially nice when performing bigger updates.
chrony - security demands the time to be correct, Chrony supports NTS and is proper NTP server instead of just SNTP like systemd-timesyncd.
- alternatively configure systemd-timesyncd
unbound - my choice for both DNSSEC validating and DNS-over-TLS, even if I had it connect to upstream dns[crypt]proxy
- alternatively configure systemd-resolved. Simultaneously systemd-networkd may be a good idea.
unattended-upgrades or dnf-automatic so security updates are at least downloaded if not even directly installed (see configuration and systemd units!)
- if dnf-automatic, consider sudo systemctl enable dnf-automatic-install.{timer,service} or at least sudo systemctl enable dnf-automatic-download.{timer,service}

nvim git tmux zsh - good luck without these
if cryptographic operations are taking ages, consider something like haveged. It’s controversial, so if there are no issues, don’t install a random number generator.
userspace oom killer, may avoid frozen systems, much more pleasant than actually having to deal with a frozen system.
- earlyoom
  - remember to sudo systemctl enable --now earlyoom
- systemd-oomd
  - remember to sudo systemctl enable --now systemd-oomd
zram-tools - small compressed swap in RAM
- Remember to check configs! Fedora: /etc/zram.conf
- sudo systemctl enable --now zramswap.service zram-swap.service
thermald for additional help keeping system cool, especially intel
- sudo systemctl enable --now thermald
vnstat - help for observing bandwidth usage
yggdrasil - essential for getting through Carrier Grade NAT whether there is IPv6 or not. Also gives static internal IPv6 reducing need for dynamic DNS.
tlp - for laptop power management, especially ThinkPad.
- sudo tlp-stat | less
- sudo systemctl enable --now tlp

This is just too close to not mention here (and was besides in my planning issue):

After installing the package, adjust /etc/vconsole.conf e.g.:

KEYMAP="fi"
FONT="ter-v16v"

Maybe sudo updatedb and locate ter-v16v at first though?

sudo systemctl enable --now fstrim.timer
check that /etc/fstab has noatime so every file access isn’t written to the disk. BTRFS filesystems should also have ssd flag.
- NEVER ENABLE atime, relatime or norelatime under the threat of suffering especially on BTRFS. I have been doing fine without it for years, it will not help any issue, unless you want read operations to cause writes and eat space…

The above applies, /etc/fstab must have noatime.
compress=zstd:0 may be helpful. It enables zstd compression, which is an integrated feature of BTRFS, with the default compression level (3 at the time of writing). The BTRFS devs are most likely wiser than me and can provide a reasonable balance between efficiency and CPU use.
- The compression will happen either the next time the file is written or can be manually triggered through sudo btrfs filesystem defragment -r "$PWD"