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1 year ago
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---
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title: BBB behind DynDNS
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description: Big Blue Button selfhosted
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date: 2023-03-07
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---
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Although BBB does not recommend to run it at home it is possible with an dynamic IP configuration. With the nowadays available fibre and fast VDSL lines at least conferences for small groups are feasible.
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The trick is to bind the websockets to localhost and let the current IP loop on localhost. Then let a script update the config on IP change.
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Lets take a look step by step. First [install BBB](https://docs.bigbluebutton.org/2.5/install.html) with the official installer. Be sure to have prepared your box according to the system requirements with the now aged ubuntu **20**.
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Then have a look at the configuration files. There are several. You can display the values of matter with `bbb-conf --check`.
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You need to adapt the config files until you get a similar output like this:
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- FQDN of server: `host.domain.tld`
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- local IP: `5.5.5.5`
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```
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BigBlueButton Server 2.5.4 (3063)
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Kernel version: 5.4.0-125-generic
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Distribution: Ubuntu 20.04.4 LTS (64-bit)
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Memory: 32893 MB
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CPU cores: 24
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/etc/bigbluebutton/bbb-web.properties (override for bbb-web)
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/usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties (bbb-web)
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bigbluebutton.web.serverURL: https://host.domain.tld
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defaultGuestPolicy: ALWAYS_ACCEPT
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svgImagesRequired: true
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defaultMeetingLayout: CUSTOM_LAYOUT
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/etc/nginx/sites-available/bigbluebutton (nginx)
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server_name: host.domain.tld
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port: 80, [::]:80
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port: 443 ssl
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/opt/freeswitch/etc/freeswitch/vars.xml (FreeSWITCH)
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local_ip_v4: 5.5.5.5
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external_rtp_ip: host:host.domain.tld
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external_sip_ip: host:host.domain.tld
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/opt/freeswitch/etc/freeswitch/sip_profiles/external.xml (FreeSWITCH)
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ext-rtp-ip: $${external_rtp_ip}
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ext-sip-ip: $${external_sip_ip}
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ws-binding: 127.0.0.1:5066
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wss-binding: 127.0.0.1:7443
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/usr/local/bigbluebutton/core/scripts/bigbluebutton.yml (record and playback)
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playback_host: host.domain.tld
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playback_protocol: https
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ffmpeg: 4.2.7-0ubuntu0.1
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/usr/share/bigbluebutton/nginx/sip.nginx (sip.nginx)
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proxy_pass: 127.0.0.1
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protocol: http
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/usr/local/bigbluebutton/bbb-webrtc-sfu/config/default.yml (Kurento SFU)
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/etc/bigbluebutton/bbb-webrtc-sfu/production.yml (Kurento SFU - override)
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kurento.ip: 5.5.5.5
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kurento.url: ws://127.0.0.1:8888/kurento
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kurento.sip_ip: 127.0.0.1
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recordScreenSharing: true
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recordWebcams: true
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codec_video_main: VP8
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codec_video_content: VP8
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/usr/share/meteor/bundle/programs/server/assets/app/config/settings.yml (HTML5 client)
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/etc/bigbluebutton/bbb-html5.yml (HTML5 client config override)
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build: 2829
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kurentoUrl: wss://host.domain.tld/bbb-webrtc-sfu
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enableListenOnly: true
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sipjsHackViaWs: true
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/usr/share/bbb-web/WEB-INF/classes/spring/turn-stun-servers.xml (STUN Server)
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stun: stun.l.google.com:19302
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```
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In detail you need to change:
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- `/opt/freeswitch/etc/freeswitch/vars.xml`
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- set `local_ip_v4` (l. 59) to the local IP
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- set `external_rtp_ip` (l. 295) and `external_sip_ip` (l. 307) to the fqdn like `host:host.domain.tld`
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- `/opt/freeswitch/etc/freeswitch/sip_profiles/external.xml`
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- set IP of `ws-binding` (l. 100) and `wss-binding` (l. 101) to `127.0.0.1`. Leave ports as they are.
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- `/usr/share/bigbluebutton/nginx/sip.nginx`
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- set `proxy_pass` IP to `127.0.0.1` leave port as is.
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- `/etc/bigbluebutton/bbb-webrtc-sfu/production.yml`
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- change it to this format, where `5.5.5.5` is the internal IP and `7.7.7.7` the external IP
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```yaml
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freeswitch:
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ip: 7.7.7.7
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sip_ip: 127.0.0.1
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kurento:
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- ip: 5.5.5.5
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url: ws://127.0.0.1:8888/kurento
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mediasoup:
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plainRtp:
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listenIp:
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announcedIp: 7.7.7.7
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ip: 0.0.0.0
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webrtc:
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listenIps:
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- announcedIp: 7.7.7.7
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ip: 0.0.0.0
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- announcedIp: 5.5.5.5
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ip: 0.0.0.0
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```
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Then you need to add the public IP to the loopback device of the server: `ip addr add 7.7.7.7/32 dev lo`.
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On each new IP given from your ISP you need you only need to update the configfile `/etc/bigbluebutton/bbb-webrtc-sfu/production.yml` and replace the IP of the local loopback device. I wrote [a little script](https://git.gugelfrei.de/bbb/dyndns-update) for that. This is a dirty hack, but should work for ovh and hetzner (own branch).
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Inspirations:
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- https://munari.xyz/2020/10/25/bigbluebutton-behind-nat/
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- https://github.com/bigbluebutton/bigbluebutton/issues/10968
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