cdist-best-practice - Practices used in real environments

It is recommended to run cdist with public key authentication. This requires a private/public key pair and the entry "PermitRootLogin without-password" in the sshd server. See sshd_config(5) and ssh-keygen(1).

When connecting to a new host, the initial delay with ssh connections is pretty big. You can work around this by "sharing of multiple sessions over a single network connection" (quote from ssh_config(5)). The following code is suitable for inclusion into your ~/.ssh/config:

Host *
  ControlPath ~/.ssh/master-%l-%r@%h:%p
  ControlMaster auto
  ControlPersist 10

If you plan to distribute cdist among servers or use different environments, you can do so easily with the included version control git. For instance if you plan to use the typical three environments production, integration and development, you can realise this with git branches:

# Go to cdist checkout
cd /path/to/cdist

# Create branches
git branch development
git branch integration
git branch production

# Make use of a branch, for instance production
git checkout production

Similar if you want to have cdist checked out at multiple machines, you can clone it multiple times:

machine-a % git clone git://your-git-server/cdist
machine-b % git clone git://your-git-server/cdist

If you are working with different groups on one cdist-configuration, you can delegate to other manifests and have the groups edit only their manifests. You can use the following snippet in conf/manifests/init:

# Include other groups
sh -e "$__manifest/systems"

sh -e "$__manifest/cbrg"

When you need to manage multiple sites with cdist, like company_a, company_b and private for instance, you can easily use git for this purpose. Including a possible common base that is reused accross the different sites:

# create branches
git branch company_a company_b common private

# make stuff for company a
git checkout company_a
# work, commit, etc.

# make stuff for company b
git checkout company_b
# work, commit, etc.

# make stuff relevant for all sites
git checkout common
# work, commit, etc.

# change to private and include latest common stuff
git checkout private
git merge common

Have a look at git-remote(1) to adjust the remote configuration, which allows you to push certain branches to certain remotes.

Copyright (C) 2011 Nico Schottelius. Free use of this software is granted under the terms of the GNU General Public License version 3 (GPLv3).