BSDStammtisch Wien 0x06 2018-07-10

Source

Past meeting 🗓

Tuesday, 2018-07-10, 19:00 (CEST)

Location 🗺

Seminarraum Technische Informatik, Operngasse 9, 1040 Wien Public Transport: U1, U2, U4 Karlsplatz, Bus 59A Bärenmühldurchgang, Nightline N60, N62, N66, N71, Tram 2 (within reasonable walking distance) Bicycle parking: Just around the corner

Attendance 🎟

Free for all people interested in learning or discussing about all things BSD! You are welcome!

Topics

  • ZFS boot-environments and beadm(8)
  • #oneWeekOneTool collective self-paced learning
  • tmux(1), a terminal multiplexer
  • Enough rope to shoot yourself in the foot with ZFS compression and freebsd-update(8)
  • Spectre and Meltdown mitigations with microcode deployments
  • Please present your topic!
  • Show and Tell
    • Show us your quick tips and tricks, the tools you use or recently discovered, be it CLI, GUI, web services, that chocolate chip cookie recipe, a book or conference recording, anything goes. No need to prepare anything.
  • Chit chat, food and drinks afterwards

Shownotes

Reports and News

  • What has happened since the last BSDStammtisch?

Mixed Topics:

ZFS boot-environments and beadm(8)

Install the package sysutils/beadm to use ZFS boot environments. You can then easily create, list and switch among your boot environments.
beadm list shows you a list of the currently available environments you could boot from. The currently active system you're booted from is marked with N. The one you will be using after a reboot is marked R.

http://callfortesting.org/bhyve-boot-environments/

  • name: freebsd-update | push /root/freebsd-update.sh script

/root/freebsd-update.sh 

#!/bin/sh -e
# ansible managed
/bin/freebsd-version -ku
export PAGER="/bin/cat -bu"
cd /etc
test -d .git || git init .
git add -A
git commit --allow-empty -am `freebsd-version -ku | sort -r |head -1`-update
zfs snapshot -r zroot@`date -u +%Y%m%d-%H%M`:`freebsd-version -ku | sort -r |head -1`-update
beadm create `freebsd-version -ku | sort -r |head -1`-update
/usr/sbin/freebsd-update --not-running-from-cron fetch install || /usr/bin/true
echo OK freebsd-update complete
echo OK List Boot Environments
beadm list
echo now run "pkg update" and confirm that the changes/reinstall/updates
echo are as expected. Once that has completed, sacrifice a goat and reboot.
#oneWeekOneTool collective self-paced learning
tmux(1), a terminal multiplexer

After one week playing with tmux I dared to publish my tmux config

Enough rope to shoot yourself in the foot with ZFS compression and freebsd-update(8)

Don't try to set your zroot ZFS pool to gzip-9 compression and the try to trick your freebsd-update to update a 11.1-STABLE to 11.1-RELEASE. BSD Loader will fail to load the kernel from the gzip-9 compress zpool.

  • Spectre and Meltdown mitigations with microcode deployments

Show and Tell

  • #oneWeekOneTool - An effort to encourage self-paced learning of the tools, applications and services you use a lot.
  • IPMI, Lights out Management, Out of band management
    • Supermicro iKVM, has severe problems with keyboard input, independent of your keyboard locale, even with the on-screen HTML keyboard. You may help yourself to enter a - by using the number-block, or starting any path with ..<tab to trigger autocompletion.
  • There actually is an iOS App for SUPERMICRO IPMI which works surprisingly good. Typing is uncomfortable, but reliable.
  • HP ILO exposes a semi-secret URL which you can use to connect with some VNC clients. host:port and Display must be set to 2.
  • Spectre and Meltdown mitigations, does have a performance hit, turning off Hyperthreading may actually improve your performance since there\'s less cache to invalidate
  • ZFS snapshot management and replication tools
  • sysutils/znapzend

Short introductions to tools you like, or that solve a problem for you. This can be anything from GUI, CLI to Webservices, a book, a podcast or conference recording you'd like to recommend or a recipe for chocolate chip cookies. Mmmhhmmmm Cookies! 🍪 No need phor a phanphy prphentaishn.

Drinks and Food afterwards

Chit chat and drinks at Fachschaft Informatik fterwards.