[feature] set Vault cluster name

[sbeliakou]

Taking Vault cluster name from Azure VM cluster name

$ AZURE_INSTANCE_METADATA_URL="http://169.254.169.254/metadata/instance?api-version=2017-08-01"
$ curl --silent --show-error --header Metadata:true --location "$AZURE_INSTANCE_METADATA_URL"

{
  "compute": {
    "location": "northeurope",
    "name": "vault-cluster_1",
    "offer": "",
    "osType": "Linux",
...
}

$ curl --silent --show-error --header Metadata:true --location "$AZURE_INSTANCE_METADATA_URL" | jq -r '.compute.name' | sed 's/_[^_]*//'
vault-cluster

[mcalhoun]

Won't the output of .compute.name be different for each node? We'd actually want the name of the cluster to be consistent across all nodes in the cluster.

[sbeliakou]

The names of nodes (taken from metadata) are "vault-cluster_$nodeIndex". This quick fix just wipes out the tail.

This is currently the only one option how "$vault-cluster-name" can come into vault config file.

Off course, we can pass this variable to custom_data directly (/opt/vault/bin/run-vault), get from metadata (as advised above) or extract from tags.

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