xcat/discovery_scaling_simulator repository overview

⁠discovery_scaling_simulator

the stuff to build docker image for discovery scaling simulator for xCAT

The autobuilt docker image can be found in https://hub.docker.com/r/xcat/discovery_scaling_simulator/builds/⁠

The steps to utilize the discovery scaling simulator:

1. find a X86_64 baremetal server and install Docker engine on it.
2. create a bridge "br0" on Docker host and attach it to a physical NIC facing the xcatd on MN

   brctl addbr br0;brctl addif br0 eno1;ifconfig eno1 0.0.0.0;ifconfig br0 10.4.41.30/8

1. create route entry to make sure the bridge "br0" can access the internet

   ip route add default via 10.0.0.101

1. create a Docker network "mynet" based on the bridge "br0" created in step #2

   sudo docker network create --driver=bridge --gateway=10.4.41.30 --subnet=10.4.224.1/8 --ip-range=10.4.224.1/24 -o "com.docker.network.bridge.name"="br0" mynet;

1. pull the discovery scaling simulator docker image

    docker pull xcat/discovery_scaling_simulator

1. run a docker container with specified IP address and MAC address to simulate the scaling discovery:

    for i in {1..500};do docker run  -e "XCATMASTER=10.3.5.21" --network mynet   --ip 10.4.$[224+i/200].$[i%200+1] --name "node$(printf %04d $i)" --hostname "node$(printf %04d $i)"  --mac-address="00:00:00:00:$(printf %02x $[i/256]):$(printf %02x $[i%256])" --entrypoint=/bin/dodiscovery --cap-add=ALL  -itd  --rm xcat/discovery_scaling_simulator; done

the environment variable "XCATMASTER" specifies the IP address of MN on which xcatd is running