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HOSTNAMES.md

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Hostnames

There is an ability to modify host names with Epiphany only in Azure.

Limitations

  • Linux host name cannot exceed 64 characters in length.
  • Kubernetes names must be no more than 63 characters.

Due to the statements above, azure provider verifies whether host names exceed limitation of 63 characters.

Generation rule

By default, host name is generated automatically using the following rules:

  1. If hostname_domain_extension is set in epiphany-cluster configuration: <cluster_prefix>-<cluster_name>-<component_name>-vm-<index>.<hostname_domain_extension>

  2. If hostname_domain_extension is not set in epiphany-cluster configuration: <cluster_prefix>-<cluster_name>-<component_name>-vm-<index>.

Changing component name

NOTE

Changing this configuration leads to replacement of component's virtual machines during re-apply.

Usually component names are predefined, but there is an ability to change them in host names. There might be such a need when hostname_domain_extension is set, and it results in exceeding the length limit. For example, to change kubernetes-master to k8s-cp, use following config:

---
kind: epiphany-cluster
title: Epiphany cluster Config
provider: azure
name: default
specification:
  ...
  components:
    kubernetes_master:
      count: 1
      alt_component_name: k8s-cp