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FOSDEM 2019 VOC manual draft

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Mark Van den Borre edited this page Jan 26, 2019 · 35 revisions

FOSDEM 2019 VOC manual

PRE-FOSDEM

Preparation for VOC admins

Install packages on your machine:

  • mpv
  • parallel-ssh
  • ansible 2.7 (debian stable backports or debian buster)

Study

Friday buildup

Physical buildup: server room

  • set up metal racks
    • in K1105, move to server room when ready
    • video team and/or general volunteers
  • unpack laptops, switch(es?)
    • TODO what switching hardware?
      • needs? 224 ports or 148? provided by network?
      • what did we use last year?
  • power & network cabling
    • switch, voctops, streamdumper-local, control
    • take pictures of the physical setup for future documentation
    • TODO who? only trusted people in the server room

Physical buildup: VOC

  • boxes with video related gear:
  • specific corner?
  • stack on tables?
  • remove lids
  • tables, chairs
  • power strip
  • big screen:
    • straps
    • x240 laptop
    • mini dp to hdmi adapter
  • video vlan:
    • 24 port switch

Ansible

Some ad-hoc commands:

  • ansible --user=root -a ""
  • Start the video recording on all video boxes: 
    ansible --user=root -a "service video-recorder start" video-box
  • Check uptime on all video related boxes: 
    ansible --user=root -a "uptime" video-*
  • You can spawn a shell before executing the command. This allows you to use pipes, chain multiple commands etc: 
    ansible --user=root -m shell -a "ip link | grep eth0" video-streamer-*
  • Check if all boxes respond: 
    ansible --user=root -m ping video-box

Control.video.fosdem.org

• check correct artwork on voctops: background.raw

• switch recording on on video boxes ∘ how to do this in parallell? parallel-ssh? ‣ grep slides.video.fosdem.org fosdem/infrastructure/ansible/hosts > videoboxes.hosts ‣ grep cam.video.fosdem.org fosdem/infrastructure/ansible/hosts >> videoboxes.hosts ‣ parallel-ssh -h videoboxes.hosts service video-recorder start

• switch on dumpers: anything to do? ∘ local ∘ remote

• restart the ingestion service on a specific video box?

• watch the pre-mixing mp4 stream from a specific video box ∘ port 8898 = to voctop? (starts slower, no point) ∘ port 8899 = to dumper? (starts immediately) ∘ mpv tcp://{{ config.room }}-cam.local:8898/?timeout=2000000 ∘ mpv tcp://{{ config.room }}-slides.local:8898/?timeout=2000000 ∘ mpv tcp://ud2120-voctop.video.fosdem.org:8899 ∘ ip to (m)dns mappings?

  • BOXNAME.local, just make sure you have avahi running
  • tcp://ud2120-voctop.local.... should work

• react to irc calls this is old, what should it do? ->• ffmpeg -i ~/video/varia/how_not_to_launch_a_rocket.mp4 -c copy -f mpegts 'udp://227.0.0.2:9000&overrun_nonfatal=1&buffer_size=81921024&fifo_size=178481'

TODO troubleshooting physical boxes returned (we have only 1 spare per type!) -> Mark?

TODO how to deploy a different room config to a spare box running the latest box config for another room (ansible) as quickly as possible

  • edit hosts in your local checkout, set ansible_host to the IP of the target box
  • ansible-playbook playbooks/site.yml -i hosts.vk --limit BOXNAME.video.fosdem.org
  • update dhcp config with new MAC
  • DONE

TODO how to deploy a different room config to a spare voctop running the latest voctop config for another room (TODO would require a spare voctop to be deployed)

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