General OS requirements

1. The host instance needs access to the internet and a working DNS
2. The host OS needs to expose the cgroups v1. New OSs often expose only cgroups v2.
   • You can check currently exposed cgroup versions by: mount | grep '^cgroup' | awk '{print $1}' | uniq
   • cgroup means v1 is exposed, cgroup2 means v2 is exposed (can be both)
   • Kernel can be forced to expose also v1 cgroups by adding kernel parameter systemd.unified_cgroup_hierarchy=0
3. Docker-CE version 20.0 or later
4. nvidia-container-toolkit version 1.7.0 or later
5. Nvidia driver version 535 or later
6. docker-compose command version 2.5 or later
7. The host must have these firewall ports/protocols allowed

• SSH (TCP port 22) - for SSH
• HTTP (TCP port 80) - needed for access to web UI and HLS output
• HTTPS (TCP port 443) - needed for secure access to web UI and HLS output
• MPEG-TS over RTP/UDP/SRT (UDP ports) - add custom ports for your MPEG-TS streams
• NDI (TCP&UDP) - needed for NDI to work, the easiest way is to open port range 5353-7999 for both TCP & UDP [NDI docs]
• RTMP input (TCP port 1935) - needed for RTMP server to listen on this port
• IGMP - for multicast

8. mDNS disabled - for NDI discovery working in the Docker, typically done by disabling/removing the avahi-daemon
9. UDP kernel buffers max size for write and read set to 256MB