hello I am having difficulty with how resource in place upda

Question

hello I am having difficulty with how resource in place updates work I am using getVirtualNetwork which has an output of subnets I proceed to add a new subnet to that virtual network however the VirtuakNetworkResult subnets do not contain the new subnet is there a way to reload a resource

salmon-account-74572 · Answer

It sounds like you re using Azure Are all your subnet definitions in line with the virtual network or separate Both ways are supported but you can t mix them you can t do some in line and some separate

sparse-iron-45589 · Answer

< salmon account 74572> yes I am using Azure sorry I didn t understand what you mean by inline or separate when I try to output the input output parameters nothing is being outputted why is that `subnet = network Subnet ` `subnet name ` `subnet name=subnet name ` `resource group name=resource group name ` `virtual network name=existing vnet name ` `address prefix=subnet prefix` ` ` `subnet virtual network name apply lambda v Subnet virtual network is + v ` `subnet resource group name apply lambda v Subnet esource group name is + v ` `subnet subnet name apply lambda v Subnet subnet name is + v `

sparse-iron-45589 · Answer

I am getting the virtual network like `if existing vnet id not in self existing vnets ` `self existing vnets existing vnet id = network VirtualNetwork get ` `f vnet existing vnet id ` `id=existing vnet id` ` ` so what I am trying to do is get the VNet add the first subnet with the next avaialble prefix and then loop again however on the 2nd iteration of the loop the VNet subnets are the same as before I created the new subnet

salmon-account-74572 · Answer

Ah so this isn t a virtual network you re creating in the same Pulumi program

salmon-account-74572 · Answer

With regard to in line versus separate when you re defining a virtual network you have the option of specifying the subnets as part of the virtual network itself or as separate resources that reference the virtual network

sparse-iron-45589 · Answer

this is all within one script let me paste it in it s entirety slightly smiling face I am trying to configure multiple subnets and have it create the subnet addresses dynamically the issue with how this works now is that the VNet subnet counts is the same on all iterations so they are all getting the same subnet prefix rather than it getting the next available each time `def get available subnet prefix self subnets vnet address space ` `used ranges = ipaddress ip network subnet address prefix network address ` `ipaddress ip network subnet address prefix broadcast address ` `for subnet in subnets ` `vnet cidr = ipaddress ip network vnet address space ` `for prefix in vnet cidr subnets new prefix=24 ` `if all prefix network address lt used range 0 or prefix broadcast address gt used range 1 ` `for used range in used ranges ` `return str prefix ` `raise Exception f No available subnet found in vnet address space ` `for cluster config in environment aks clusters ` `existing vnet id = cluster config get existing vnet id ` `resource group name = cluster config resource group name ` `vnet address space = cluster config vnet address space ` `if existing vnet id is not None ` `if existing vnet id not in self existing vnets ` `self existing vnets existing vnet id = network VirtualNetwork get ` `f vnet existing vnet id ` `id=existing vnet id` ` ` `existing vnet = self existing vnets existing vnet id ` `existing vnet subnets apply lambda s Length of subnets is + str len s ` `existing vnet name apply lambda n Virtual network name is + n ` `subnet prefix = existing vnet subnets apply lambda subnets self get available subnet prefix subnets vnet address space ` `if subnet prefix is None ` `raise ValueError No available subnet prefix found within the VNet ` `subnet name = f team name service name environment name subnet ` `subnet = network Subnet ` `subnet name ` `subnet name=subnet name ` `resource group name=resource group name ` `virtual network name=existing vnet name ` `address prefix=subnet prefix` ` `

sparse-iron-45589 · Answer

oh ok no I am not doing this inline instead I am trying to add new Subnet resoruces to an existing VNet resource that already exists

sparse-iron-45589 · Answer

so where I am struggling is with how to get the subnets output in VNets to include the newly created one on subsequent iterations

sparse-iron-45589 · Answer

Subnet address prefix is 10 200 1 0 24 Subnet address prefix is 10 200 1 0 24 the subnet prefix for both subnets is the same I d like it so that it is Subnet address prefix is 10 200 1 0 24 Subnet address prefix is 10 200 2 0 24

salmon-account-74572 · Answer

Python is not my forté but if I am interpreting your program correctly you are looping through to see if a prefix is used and then incrementing it if it is used is that right

sparse-iron-45589 · Answer

that s correct the issue is the the VirtualNetwork subnets are always of length 2 so on first iteration it is 2 then on the 2nd iteration I expect it to be 3 including the newly added Subnet resource we created and assigned to

sparse-iron-45589 · Answer

that s why I was wondering in my initial question how to update the Virtual Network subnets output do I need to do a refreh from what I read it should do an in place replacement but that doesn t seem to be happening

salmon-account-74572 · Answer

Right gotcha What is the desired end result Three subnets with address prefixes of 10 100 X 0 24

sparse-iron-45589 · Answer

you got it

sparse-iron-45589 · Answer

if it helps I can attach the scripts somewhere as well if you d like

salmon-account-74572 · Answer

No need for now anyway slightly smiling face First I m not 100 sure why you re seeing the behavior you re seeing but I suspect it may be related to <https github com pulumi pulumi azure native issues 611> which reflects a limitation in how the Azure API works AFAIK the only workaround is to define your subnets in line i e embedded in the virtual network definition If your program is creating the virtual network and I thought you indicated that your program was then this is pretty straightforward Does this make sense Let me know if I m missing some crucial detail

sparse-iron-45589 · Answer

the virtual network is not being created by the script it already exists so I am unable to define the subnets inline

sparse-iron-45589 · Answer

so if the virtual network is already created I want to create multiple subnets on that virtual network with subnet address prefixes of 10 100 X 0 24 which would be based off what s available to determine that availability I need to know all the subnets for that vnet after adding the new subnet the VNet subnets output does not have the new subnet so it continually assigns the same subnet address prefix to all subnets

sparse-iron-45589 · Answer

so I have an existing vnet ID which I use to get the vnet I want to add subnets to `self existing vnets existing vnet id = network VirtualNetwork get ` `f vnet existing vnet id ` `id=existing vnet id` ` `

sparse-iron-45589 · Answer

so unfortunaltey I can create them inline I have to do it by setting the virtual network name when creating the subnet virtual network name=existing vnet name from the docs ```subnet = azure native network Subnet subnet address prefix= 10 0 0 0 16 resource group name= subnet test subnet name= subnet1 virtual network name= vnetname ```

sparse-iron-45589 · Answer

and I am bit more confused as ```subnet virtual network name apply lambda v Subnet virtual network is + v subnet resource group name apply lambda v Subnet esource group name is + v subnet subnet name apply lambda v Subnet subnet name is + v ```

salmon-account-74572 · Answer

OK I see sorry I must have misunderstood something earlier regarding the Vnet creation

sparse-iron-45589 · Answer

no worries I am new to all this so I am sure my explanations aren t great lol

sparse-iron-45589 · Answer

``` aks clusters name aks cluster1 location eastus organization cdx resource group name Internal aks Services 2 existing vnet id subscriptions XXXX XXXX XXXXX XXXXX b0862310b2cc resourceGroups InternalServices providers Microsoft Network virtualNetworks InternalServices vnet vnet address space 10 200 0 0 16 subnet prefix 10 200 2 0 24``` if I specify the subnet prefix address in the config and read it in it works as expected however the devops eng asked if we could do it dynamically which is where I am stuck as you can see slightly smiling face

salmon-account-74572 · Answer

Gotcha Let me ping some folks internally and see if we can brainstorm on some ideas to help get you unstuck

sparse-iron-45589 · Answer

awesome let me know if you need anything else from me

sparse-iron-45589 · Answer

< salmon account 74572> any luck just wanted to followup before the weekend thanks for everything

salmon-account-74572 · Answer

< sparse iron 45589> Hey John sorry for the delayed response I don t have any additional information yet but I ll ping the team again

salmon-account-74572 · Answer

< sparse iron 45589> Hi John I got a response from one of our engineers He suggested switching over to the Azure Classic provider to see if that helps Give that a try and let me know how you get on