Obtaining Azure VM scale set private IP addresses through Azure REST API - rest

Question

Can you get a list of Azure VM scale set instance private IP addresses through the Azure REST API?
It seems that Microsoft does not publish the VMSS IP configuration objects under the normal methods for retrieving a list of "ipConfigurations".
Here are some relevant API doc pages:
https://learn.microsoft.com/en-us/rest/api/compute/virtualmachinescalesets/listall
https://learn.microsoft.com/en-us/rest/api/compute/virtualmachinescalesets/get
https://learn.microsoft.com/en-us/rest/api/compute/virtualmachines/listall
In particular, this one only gives you the IP configuration of VMs, not VMSSes:
https://learn.microsoft.com/en-us/rest/api/virtualnetwork/networkinterfaces/listall

Answer 1

Here's how to get a list of private IP addresses for VMs and VMSS instances through Ruby:
require 'openssl'
require 'azure_mgmt_network'
require 'azure_mgmt_compute'
require 'awesome_print'
options = {
tenant_id: '<tenant_id>',
client_id: '<client_id>',
client_secret: '<client_secret>',
subscription_id: '<subscription_id>'
}
def net_interface_to_ip_mapping(client)
network_interfaces = client.network_interfaces.list_all
pairs = network_interfaces.collect { |ni| [ni.id.split('/').last, ni.ip_configurations.collect { |ip| ip.private_ipaddress }.flatten.compact[0] ] }
[network_interfaces, pairs]
end
def net_interface_to_vm(ni)
interface_vm_set = ni.collect { |prof| [prof.id, prof.virtual_machine, prof.ip_configurations.collect(&:id)] }
ipconf_to_host = interface_vm_set.collect { |x| [x[2][0], x[1]&.id&.split('/')&.last] }.to_h
conf_ip_map = ni.collect(&:ip_configurations).flatten.compact.collect { |ipconf| [ipconf&.id, ipconf&.private_ipaddress] }.to_h
[ipconf_to_host, conf_ip_map]
end
puts "*** Network Interfaces"
puts
client = Azure::Network::Profiles::Latest::Mgmt::Client.new(options)
ni, pairs = net_interface_to_ip_mapping(client)
pairs.to_h.each do |ni, ip|
puts " #{ni}: #{ip}"
end
puts
puts "*** Virtual Machines"
puts
ipconf_to_host, conf_ip_map = net_interface_to_vm(ni)
ipconf_to_host.each do |ipconf, host|
ni_name = ipconf.split('/')[-3]
puts " #{host || '# ' + ni_name} - #{conf_ip_map[ipconf]}"
end
puts
puts "*** Virtual Machine Scale Sets"
puts
vns = client.virtual_networks.list_all
vns.each do |vn|
resource_group = vn.id.split('/')[4]
puts
vn_details = client.virtual_networks.get(resource_group, vn.name, expand: 'subnets/ipConfigurations')
ip_configs = vn_details&.subnets&.collect { |subnet| subnet&.ip_configurations&.collect { |ip| [ip&.id, ip&.name, ip&.private_ipaddress] } }.compact
vmss_ipconf = ip_configs.collect { |subnet| subnet.select { |ipconf| ipconf[0].include?('/virtualMachineScaleSets/') } }
vmss_ipconf.each do |subnet|
subnet.each do |ipconf|
vmss_name = ipconf[0].split('/')[8]
vmss_instance = ipconf[0].split('/')[10]
puts "#{vmss_name} ##{vmss_instance} - #{ipconf[2]}"
end
end
end

Answer 2

Looking at the Azure CLI, there is az vmss nic list which returns all network interfaces in a virtual machine scale set. Looking at the results, there is
{
"dnsSettings": {
...
},
"ipConfigurations": [
{
privateIpAddress: "..."
}
]
}
You can use the --query syntax to get all private IPs.
az vmss nic list -g <resource_group> --vmss-name <vmss_name> --query [].{ip:ipConfigurations[0].privateIpAddress} -o tsv

Answer 3

you can get VM hostnames that will resolve to IPs thanks to Azure DNS
$ curl -H "Authorization: Bearer $JWT_TOCKEN" -sf https://management.azure.com/subscriptions/${subscription_id}/resourceGroups/${resourc_group}/providers/Microsoft.Compute/virtualMachineScaleSets/${scale_set}/virtualMachines?api-version=2018-10-01 | jq '.value[].properties.osProfile.computerName'
"influx-meta000000"
"influx-meta000001"
$ getent hosts influx-meta000001
10.120.10.7 influx-meta000001.l55qt5nuiezudgvyxzyvtbihmf.gx.internal.cloudapp.net