abo-adapt / hostsfile-formula

Use minion IDs to keep /etc/hosts and hostnames consistent for clusters without DNS

hostsfile

Formula to set up name resolution for all members of a salt cluster in /etc/hosts.

Note

See the full Salt Formulas installation and usage instructions.

Available states

• hostsfile
• hostsfile.hostname

hostsfile

Uses the Salt Mine function network.ip_addrs to add minion ids and their regarding ips to the local hosts file.

At a minimum, you must enable the network.ip_addrs function in pillar or in /etc/salt/minion:

mine_functions:
  network.ip_addrs: []

The formula works best if the minion id is the fqdn and (if the machines have more than one interface) the desired interface to use for this is configured with the mine function:

mine_functions:
  network.interfaces: []
  network.ip_addrs:
    - eth1
mine_interval: 2

If you are already using network.ip_addrs for something else (perhaps another state that wants information on a different interface than hostsfile should use), you can specify a mine alias in pillar to query instead:

hostsfile:

alias: hostsfile_interface

mine_functions:

hostsfile_interface:

mine_function: network.ip_addrs iface: eth0

hostsfile.hostname

Also set and persist the hostname (again - using the minion id). This has so far been most useful on EC2 instances.

Works on RedHat/CentOS 5.X or RedHat/CentOS 6.X and Amazon OS - should also work on Ubuntu/Debian.