SECO range is a cluster-based metadata store developed and maintained by Yahoo!
The Range project is hosted here:
Learn more about range here:
To utilize range support in Salt, a range server is required. Setting up a range server is outside the scope of this document. Apache modules are included in the range distribution.
With a working range server, cluster files must be defined. These files are written in YAML and define hosts contained inside a cluster. Full documentation on writing YAML range files is here:
Additionally, the Python seco range libraries must be installed on the salt master. One can verify that they have been installed correctly via the following command:
python -c 'import seco.range'
If no errors are returned, range is installed successfully on the salt master.
Range support must be enabled on the salt master by setting the hostname and port of the range server inside the master configuration file:
Following this, the master must be restarted for the change to have an effect.
Once a cluster has been defined, it can be targeted with a salt command by
For example, given the following range YAML file being served from a range server:
$ cat /etc/range/test.yaml CLUSTER: host1..100.test.com APPS: - frontend - backend - mysql
One might target host1 through host100 in the test.com domain with Salt as follows:
salt --range %test:CLUSTER test.ping
The following salt command would target three hosts:
salt --range %test:APPS test.ping