Building Helix Server Cluster using LVS

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Introduction

Helix is an open source project started by Real Networks to provide audio and media service.

A single Helix always has its limitation in performance. Server cluster can be used to scale up the performance of the whole Helix media system.

Helix streaming service uses the following protocols:

  • PNM (TCP on port 7070, UDP from server -> player on ports 6970-7170)
  • RTSP (TCP on port 554, similar UDP as above, but often on multiple ports)
  • PNM was our original, but now mostly legacy, protocol used in our versions 1 through 5.
  • There's also a HTTP/TCP-only fallback mode which is (usually) on port 8080.

Architecture

Configuration Example

VS/NAT

VIP/EXT IP 192.168.9.244
GATEWAY IP 192.168.0.1
RS1 192.168.0.150
RS2 192.168.0.160


Run the follwing script on LB Server: 

ipvsadm -A -t 192.168.9.244:554  -s rr
ipvsadm -a -t 192.168.9.244:554  -r 192.168.0.150 -m
ipvsadm -a -t 192.168.9.244:554  -r 192.168.0.160 -m

Run 

realplay rtsp://192.168.9.244/test.rm

for a test.


VS/DR

VIP/eth0:0 192.168.9.200/24
LB/eth0 192.168.9.244
RS1 192.168.9.150 with lo0:0 192.168.9.244/32 noarp
RS2 192.168.9.160 with lo0:0 192.168.9.244/32 noarp

Run the follwing script on LB Server: 

ipvsadm -C
ipvsadm -A -t 192.168.9.200:554  -s rr
ipvsadm -a -t 192.168.9.200:554  -r 192.168.9.150 -g
ipvsadm -a -t 192.168.9.200:554  -r 192.168.9.160 -g

Run 

realplay rtsp://192.168.9.200/test.rm

for a test.

Conclusion

References


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