Change max pods per node on cli

Change max pods per node on cli

Problem

i’m facing problem in my AKS, as i found max pods number is 30 per node, when i checked the deployed pods I found ±10 pods are related to AKS system itself, i think max pods number should not include AKS system pods as this reduced my limit to 20 not 30 as mentioned in MS doc.

Expectative:

run az aks nodepool update --cluster-name <you aks cluster name> --name <pool name> --max-pods=$maxpodsize (currently it doesn’t work)

Workaround:

1. I created an new node pool az aks nodepool add --cluster-name <you aks cluster name> -g <your-aks-resource-group> --max-pods $maxpodsize --name newpool --enable-cluster-autoscaler --min-count 1 --max-count 1 -c 1 -s <machine size>

2. Scale down the node of agentpool one per one and scale up newpool as necessary

Workaround problem:

I tried to remove the default pool, but the cli show an error

The message is: Operation failed with status: ‘Bad Request’. Details: There has to be at least one system agent pool.

Workaround Expectative:

Cleaning the default pool if other pool was work

[pvorb]

But why can’t you update the maximum number of pods for an existing nodepool? Could this be added to the cli, please?

[jluk]

The max pod setting per node is user defined and done so at create time only for each agent pool. There is no update functionality for it as seen from the possible commands on update:

Command
    az aks nodepool update : Update a node pool to enable/disable cluster-autoscaler or change min-
    count or max-count.

Arguments
    --cluster-name       [Required] : The cluster name.
    --name -n            [Required] : The node pool name.
    --resource-group -g  [Required] : Name of resource group. You can configure the default group
                                      using `az configure --defaults group=<name>`.
    --disable-cluster-autoscaler -d : Disable cluster autoscaler.
    --enable-cluster-autoscaler -e  : Enable cluster autoscaler.
    --max-count                     : Maximum nodes count used for autoscaler, when "--enable-
                                      cluster-autoscaler" specified. Please specify the value in the
                                      range of [1, 100].
    --min-count                     : Minimum nodes count used for autoscaler, when "--enable-
                                      cluster-autoscaler" specified. Please specify the value in the
                                      range of [1, 100].
    --mode                          : The mode for a node pool which defines a node pool's primary
                                      function. If set as "System", AKS prefers system pods
                                      scheduling to node pools with mode `System`. Learn more at
                                      https://aka.ms/aks/nodepool/mode.  Allowed values: System,
                                      User.
    --no-wait                       : Do not wait for the long-running operation to finish.
    --tags                          : Space-separated tags: key[=value] [key[=value] ...]. Use '' to
                                      clear existing tags.
    --update-cluster-autoscaler -u  : Update min-count or max-count for cluster autoscaler.

Clusters require at least 1 system pool, as returned in err msg. This is detailed here: https://docs.microsoft.com/en-us/azure/aks/use-system-pools