Salt 0.14.0 Release Notes¶

Salt - As a Cloud Controller¶

This is the first primitive inroad to using Salt as a cloud controller is available in 0.14.0. Be advised that this is alpha, only tested in a few very small environments.

The cloud controller is built using kvm and libvirt for the hypervisors. Hypervisors are autodetected as minions and only need to have libvirt running and kvm installed to function. The features of the Salt cloud controller are as follows:

• Basic vm discovery and reporting
• Creation of new virtual machines
• Seeding virtual machines with Salt via qemu-nbd or libguestfs
• Live migration (shared and non shared storage)
• Delete existing VMs

It is noteworthy that this feature is still Alpha, meaning that all rights are reserved to change the interface if needs be in future releases!

Libvirt State¶

One of the problems with libvirt is management of certificates needed for live migration and cross communication between hypervisors. The new libvirt state makes the Salt Master hold a CA and manage the signing and distribution of keys onto hypervisors, just add a call to the libvirt state in the sls formulas used to set up a hypervisor:

libvirt_keys:
  libvirt.keys

New get Functions¶

An easier way to manage data has been introduced. The pillar, grains, and config execution modules have been extended with the new get function. This function works much in the same way as the get method in a python dict, but with an enhancement, nested dict components can be extracted using a : delimiter.

如果在pillar中有这样的一个结构

foo:
  bar:
    baz: quo

在sls公式或文件模板中从原始pillar中提取数据是通过这种方式完成的:

{{ pillar['foo']['bar']['baz'] }}

Now with the new get function the data can be safely gathered and a default can be set allowing the template to fall back if the value is not available:

{{ salt['pillar.get']('foo:bar:baz', 'qux') }}

This makes handling nested structures much easier, and defaults can be cleanly set. This new function is being used extensively in the new formulae repository of salt sls formulas.