# Disable IPV6 On Airctl Management Cluster

## Problem

ETCD fails to start as it looks for IPV6, while the underlying node has IPV6 disabled.

* ETCD fails with the below errors

{% tabs %}
{% tab title="ETCD error logs" %}

```javascript
"level":"warn","ts":"2023-05-07T09:41:51.525Z","caller":"etcdmain/etcd.go:176","msg":"failed to start etcd","error":"listen tcp [::1]:2379: socket: address family not supported by protocol"}
{"level":"fatal","ts":"2023-05-07T09:41:51.525Z","caller":"etcdmain/etcd.go:271","msg":"discovery failed","error":"listen tcp [::1]:2379: socket: address family not supported by protocol","stacktrace":"go.etcd.io/etcd/etcdmain.startEtcdOrProxyV2<br>\t/tmp/etcd-release-3.4.14/etcd/release/etcd/etcdmain/etcd.go:271<br>go.etcd.io/etcd/etcdmain.Main<br>\t/tmp/etcd-release-3.4.14/etcd/release/etcd/etcdmain/main.go:46<br>main.main<br>\t/tmp/etcd-release-3.4.14/etcd/release/etcd/main.go:28<br>runtime.main<br>\t/usr/local/go/src/runtime/proc.go:200"}
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Edge Cloud - 5.6.7 and higher.

## Cause

* IPV6 is disabled on the underlying nodes but the management cluster still points to the IPV6 address.

## Procedure

To disable IPV6 on the management cluster1, we need to delete the management cluster, disable IPV6 and recreate the cluster again.

1. Delete the management cluster using `$ airctl advanced-ddu delete-mgmt` .
2. Disable IPV6 by adding `**ipv6: false**` value in `_clusterSpec.yml_` located at `_/root_`
3. Recreate the management cluster using `$ airctl advanced-ddu create-mgmt` this should take latest `_clusterSpec.yml_` which has IPV6 disabled.
4. Verify if IPV6 address for ETCD is not reflected at "`_/etc/pf9/nodelet/config_sunpike.yaml_`" .


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