Hosts file

9.1.2. Hosts file#

Hosts file (/etc/hosts) is generated using all the nodes provided in the inventory.

There are few settings related to its generation.

9.1.2.1. External hosts#

It is possible to define external hosts to be added into hosts file. To do so, define hosts_file_external_hosts this way:

hosts_file_external_hosts:
  myhost: 10.10.10.10
  mysecondhost: 7.7.7.7
  mythirdhost:
      ip4: 10.10.10.33
      alias:
      - machine3
      - extmachine3

9.1.2.2. Domain name#

The role will use either bb_domain_name or hosts_file_domain_name variable to set FQDN. Default is cluster.local if none is set. Note that hosts_file_domain_name precedence the global variable bb_domain_name if both are set.

9.1.2.3. Extended naming#

User can enable or disable extended naming using the hosts_file_enable_extended_names variable. Default is true.

For example, for an host defined this way:

c001:
  alias:
      - foobar
  network_interfaces:
      - name: eth0
      ip4: 10.10.3.1
      network: net-admin
      - name: eth1
      ip4: 10.20.3.1
      network: para
      alias: fuuuuu

If hosts_file_enable_extended_names: true, then the following content will be written by default into /etc/hosts file (assuming here domain name set is bluebanquise.local):

10.10.0.3 c001 c001.bluebanquise.local foobar
10.10.3.1 c001-net-admin
10.20.3.1 c001-para fuuuuu

While if hosts_file_enable_extended_names: false, then the following content will be written into /etc/hosts file:

10.10.0.3 c001 c001.bluebanquise.local foobar
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