Configuring /etc/hosts v23

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By default, TPA will add lines to /etc/hosts on the target instances with the IP address and hostname(s) of every instance in the cluster, so that they can use each other's names for communication within the cluster (e.g., in primary_conninfo for Postgres).

You can specify a list of extra_etc_hosts_lines too:

instances:
- Name: one
  …
  vars:
    extra_etc_hosts_lines:
    - 192.0.2.1 acid.example.com
    - 192.0.2.2 water.example.com

If you don't want the default entries at all, you can specify the complete list of etc_hosts_lines for an instance instead, and only those lines will be added to /etc/hosts:

instances:
- Name: one
  …
  vars:
    etc_hosts_lines:
    - 192.0.2.1 acid.example.com
    - 192.0.2.2 water.example.com
    - 192.0.2.3 base.example.com

If your /etc/hosts doesn't contain the default entries for instances in the cluster, you'll need to ensure the names can be resolved in some other way.

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