agolomoodysaada

az vmss extension set \
  --vmss-name <vmss-name> \
  -g <resource-group> \
  -n VMAccessForLinux \
  --publisher Microsoft.OSTCExtensions \
  --version 1.4 \
  --protected-settings "{\"username\":\"deploy_user\", \"ssh_key\":\"$(cat ~/.ssh/id_rsa.pub)\"}"
# Upgrade ALL instances in the scale set with the new key  
az vmss update-instances --instance-ids '*'
                         -n <vmss-name>