[Feature Request] Add number of sockets to system information script

[nbornstein]

Rancher customers sometimes use the system information script to determine the number of nodes being managed by Rancher for purposes of right-sizing subscriptions. With the current subscription model we look at sockets so it would be useful to list number of sockets per node as well as everything else. I have done some work on this but it needs improvement. Here's the code I have so far:

for node in $(kubectl get nodes -l 'node-role.kubernetes.io/worker=true' -o custom-columns=NAME:.metadata.name --no-headers);
do 
    echo -n "${node}: "; 
    kubectl debug -q -it node/${node} --image=registry.suse.com/bci/bci-base:15.7  -- bash -c 'grep "physical id" /proc/cpuinfo | sort -u | wc -l'; 
    sleep 2;
    kubectl delete pod $(kubectl get pods -o custom-columns=NAME:.metadata.name | grep node-debugger-${node}) > /dev/null;
done

Ideally this socket information would be included inline with the other node information, not as a separate script as I've done here.

[flrichar]

Another quick note, lscpu has json output, so one option may be to select fields by their names like this ...

lscpu -J | jq '.lscpu[] | select(.field=="CPU(s):"), select(.field=="Socket(s):"), select(.field=="Core(s) per socket:"), select(.field=="Thread(s) per core:")'

{
  "field": "CPU(s):",
  "data": "16"
}
{
  "field": "Thread(s) per core:",
  "data": "2"
}
{
  "field": "Core(s) per socket:",
  "data": "8"
}
{
  "field": "Socket(s):",
  "data": "1"
}

This machine has 1 socket, eight cores, two threads per core for a total of 16 cpus.

[nbornstein]

Another note, the output would have to take into account hyperthreads, which appear as normal CPUs but aren't charged for separately. See example 2 in https://doc.callmematthi.eu/static/webArticles/Understanding%20Linux%20_proc_cpuinfo.pdf.