================================
Miscellaneous Salt Cloud Options
================================

This page describes various miscellaneous options available in Salt Cloud

Deploy Script Arguments
=======================
Custom deploy scripts are unlikely to need custom arguments to be passed to
them, but salt-bootstrap has been extended quite a bit, and this may be
necessary. script_args can be specified in either the profile or the map file,
to pass arguments to the deploy script:

.. code-block:: yaml

    ec2-amazon:
        provider: ec2
        image: ami-1624987f
        size: Micro Instance
        ssh_username: ec2-user
        script: bootstrap-salt
        script_args: -c /tmp/

This has also been tested to work with pipes, if needed:

.. code-block:: yaml

    script_args: | head


Sync After Install
==================
Salt allows users to create custom modules, grains and states which can be 
synchronised to minions to extend Salt with further functionality.

This option will inform Salt Cloud to synchronise your custom modules, grains,
states or all these to the minion just after it has been created. For this to 
happen, the following line needs to be added to the main cloud 
configuration file:

.. code-block:: yaml

    sync_after_install: all

The available options for this setting are:

.. code-block:: yaml

    modules
    grains
    states
    all


Setting up New Salt Masters
===========================
It has become increasingly common for users to set up multi-hierarchal
infrastructures using Salt Cloud. This sometimes involves setting up an
instance to be a master in addition to a minion. With that in mind, you can
now lay down master configuration on a machine by specifying master options
in the profile or map file.

.. code-block:: yaml

    make_master: True

This will cause Salt Cloud to generate master keys for the instance, and tell
salt-bootstrap to install the salt-master package, in addition to the
salt-minion package.

The default master configuration is usually appropriate for most users, and
will not be changed unless specific master configuration has been added to the
profile or map:

.. code-block:: yaml

    master:
        user: root
        interface: 0.0.0.0


Delete SSH Keys
===============
When Salt Cloud deploys an instance, the SSH pub key for the instance is added
to the known_hosts file for the user that ran the salt-cloud command. When an
instance is deployed, a cloud provider generally recycles the IP address for
the instance.  When Salt Cloud attempts to deploy an instance using a recycled
IP address that has previously been accessed from the same machine, the old key
in the known_hosts file will cause a conflict.

In order to mitigate this issue, Salt Cloud can be configured to remove old
keys from the known_hosts file when destroying the node. In order to do this,
the following line needs to be added to the main cloud configuration file:

.. code-block:: yaml

    delete_sshkeys: True


Keeping /tmp/ Files
===================
When Salt Cloud deploys an instance, it uploads temporary files to /tmp/ for
salt-bootstrap to put in place. After the script has run, they are deleted. To
keep these files around (mostly for debugging purposes), the --keep-tmp option
can be added:

.. code-block:: bash

    salt-cloud -p myprofile mymachine --keep-tmp

For those wondering why /tmp/ was used instead of /root/, this had to be done
for images which require the use of sudo, and therefore do not allow remote
root logins, even for file transfers (which makes /root/ unavailable).


Hide Output From Minion Install
===============================
By default Salt Cloud will stream the output from the minion deploy script 
directly to STDOUT. Although this can been very useful, in certain cases you 
may wish to switch this off. The following config option is there to enable or 
disable this output:

.. code-block:: yaml

    display_ssh_output: False


Connection Timeout
==================

There are several stages when deploying Salt where Salt Cloud needs to wait for 
something to happen. The VM getting it's IP address, the VM's SSH port is 
available, etc.

If you find that the Salt Cloud defaults are not enough and your deployment 
fails because Salt Cloud did not wait log enough, there are some settings you 
can tweak.

.. admonition:: Note

    All values should be provided in seconds


You can tweak these settings globally, per cloud provider, or event per profile 
definition.


wait_for_ip_timeout
~~~~~~~~~~~~~~~~~~~

The amount of time Salt Cloud should wait for a VM to start and get an IP back 
from the cloud provider. Default: 5 minutes.


wait_for_ip_interval
~~~~~~~~~~~~~~~~~~~~

The amount of time Salt Cloud should sleep while querying for the VM's IP.  
Default: 5 seconds.


ssh_connect_timeout
~~~~~~~~~~~~~~~~~~~

The amount of time Salt Cloud should wait for a successful SSH connection to 
the VM. Default: 5 minutes.


wait_for_passwd_timeout
~~~~~~~~~~~~~~~~~~~~~~~

The amount of time until an ssh connection can be established via password or 
ssh key. Default 15 seconds.


wait_for_passwd_maxtries
~~~~~~~~~~~~~~~~~~~~~~~~

The number of attempts to connect to the VM until we abandon.
Default 15 attempts


wait_for_fun_timeout
~~~~~~~~~~~~~~~~~~~~

Some cloud drivers check for an available IP or a successful SSH connection 
using a function, namely, SoftLayer and SoftLayer-HW. So, the amount of time 
Salt Cloud should retry such functions before failing. Default: 5 minutes.


wait_for_spot_timeout
~~~~~~~~~~~~~~~~~~~~~

The amount of time Salt Cloud should wait before an EC2 Spot instance is 
available. This setting is only available for the EC2 cloud driver.


Salt Cloud Cache
================

Salt Cloud can maintain a cache of node data, for supported providers. The
following options manage this functionality.


update_cachedir
~~~~~~~~~~~~~~~

On supported cloud providers, whether or not to maintain a cache of nodes
returned from a --full-query. The data will be stored in ``json`` format under
``<SALT_CACHEDIR>/cloud/active/<DRIVER>/<PROVIDER>/<NODE_NAME>.json``. This
setting can be True or False.


diff_cache_events
~~~~~~~~~~~~~~~~~

When the cloud cachedir is being managed, if differences are encountered
between the data that is returned live from the cloud provider and the data in
the cache, fire events which describe the changes. This setting can be True or
False.

Some of these events will contain data which describe a node. Because some of
the fields returned may contain sensitive data, the ``cache_event_strip_fields``
configuration option exists to strip those fields from the event return.

.. code-block:: yaml

    cache_event_strip_fields:
      - password
      - priv_key

The following are events that can be fired based on this data.


salt/cloud/minionid/cache_node_new
**********************************
A new node was found on the cloud provider which was not listed in the cloud
cachedir. A dict describing the new node will be contained in the event.


salt/cloud/minionid/cache_node_missing
**************************************
A node that was previously listed in the cloud cachedir is no longer available
on the cloud provider.


salt/cloud/minionid/cache_node_diff
***********************************
One or more pieces of data in the cloud cachedir has changed on the cloud
provider. A dict containing both the old and the new data will be contained in
the event.


SSH Known Hosts
===============

Normally when bootstrapping a VM, salt-cloud will ignore the SSH host key. This
is because it does not know what the host key is before starting (because it
doesn't exist yet). If strict host key checking is turned on without the key
in the ``known_hosts`` file, then the host will never be available, and cannot
be bootstrapped.

If a provider is able to determine the host key before trying to bootstrap it,
that provider's driver can add it to the ``known_hosts`` file, and then turn on
strict host key checking. This can be set up in the main cloud configuration
file (normally ``/etc/salt/cloud``) or in the provider-specific configuration
file:

.. code-block:: yaml

    known_hosts_file: /path/to/.ssh/known_hosts

If this is not set, it will default to ``/dev/null``, and strict host key
checking will be turned off.

It is highly recommended that this option is *not* set, unless the user has
verified that the provider supports this functionality, and that the image
being used is capable of providing the necessary information. At this time,
only the EC2 driver supports this functionality.
