151 lines
4.8 KiB
Plaintext
151 lines
4.8 KiB
Plaintext
cdist-best-practice(7)
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======================
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Nico Schottelius <nico-cdist--@--schottelius.org>
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NAME
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----
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cdist-best-practice - Practices used in real environments
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PASSWORDLESS CONNECTIONS
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------------------------
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It is recommended to run cdist with public key authentication.
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This requires a private/public key pair and the entry
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"PermitRootLogin without-password" in the sshd server.
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See sshd_config(5) and ssh-keygen(1).
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SPEEDING UP SSH CONNECTIONS
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---------------------------
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When connecting to a new host, the initial delay with ssh connections
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is pretty big. You can work around this by
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"sharing of multiple sessions over a single network connection"
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(quote from ssh_config(5)). The following code is suitable for
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inclusion into your ~/.ssh/config:
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--------------------------------------------------------------------------------
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Host *
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ControlPath ~/.ssh/master-%l-%r@%h:%p
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ControlMaster auto
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ControlPersist 10
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--------------------------------------------------------------------------------
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MULTI MASTER OR ENVIRONMENT SETUPS
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----------------------------------
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If you plan to distribute cdist among servers or use different
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environments, you can do so easily with the included version
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control git. For instance if you plan to use the typical three
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environments production, integration and development, you can
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realise this with git branches:
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# Go to cdist checkout
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cd /path/to/cdist
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# Create branches
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git branch development
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git branch integration
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git branch production
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# Make use of a branch, for instance production
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git checkout production
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--------------------------------------------------------------------------------
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Similar if you want to have cdist checked out at multiple machines,
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you can clone it multiple times:
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--------------------------------------------------------------------------------
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machine-a % git clone git://your-git-server/cdist
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machine-b % git clone git://your-git-server/cdist
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--------------------------------------------------------------------------------
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SEPERATING WORK BY GROUPS
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-------------------------
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If you are working with different groups on one cdist-configuration,
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you can delegate to other manifests and have the groups edit only
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their manifests. You can use the following snippet in
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**conf/manifests/init**:
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--------------------------------------------------------------------------------
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# Include other groups
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sh -e "$__manifest/systems"
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sh -e "$__manifest/cbrg"
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--------------------------------------------------------------------------------
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MAINTAINING MULTIPLE CONFIGURATIONS
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-----------------------------------
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When you need to manage multiple sites with cdist, like company_a, company_b
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and private for instance, you can easily use git for this purpose.
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Including a possible common base that is reused accross the different sites:
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--------------------------------------------------------------------------------
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# create branches
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git branch company_a company_b common private
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# make stuff for company a
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git checkout company_a
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# work, commit, etc.
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# make stuff for company b
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git checkout company_b
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# work, commit, etc.
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# make stuff relevant for all sites
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git checkout common
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# work, commit, etc.
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# change to private and include latest common stuff
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git checkout private
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git merge common
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--------------------------------------------------------------------------------
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The following **.git/config** is taken from a a real world scenario:
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--------------------------------------------------------------------------------
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# Track upstream, merge from time to time
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[remote "upstream"]
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url = git://git.schottelius.org/cdist
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fetch = +refs/heads/*:refs/remotes/upstream/*
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# Same as upstream, but works when being offline
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[remote "local"]
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fetch = +refs/heads/*:refs/remotes/local/*
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url = /home/users/nico/p/cdist
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# Remote containing various ETH internal branches
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[remote "eth"]
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url = sans.ethz.ch:/home/services/sans/git/cdist-eth
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fetch = +refs/heads/*:refs/remotes/eth/*
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# Public remote that contains my private changes to cdist upstream
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[remote "nico"]
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url = git.schottelius.org:/home/services/git/cdist-nico
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fetch = +refs/heads/*:refs/remotes/nico/*
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# The "nico" branch will be synced with the remote nico, branch master
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[branch "nico"]
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remote = nico
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merge = refs/heads/master
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# ETH stable contains rock solid configurations used in various places
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[branch "eth-stable"]
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remote = eth
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merge = refs/heads/stable
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--------------------------------------------------------------------------------
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Have a look at git-remote(1) to adjust the remote configuration, which allows
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you to push certain branches to certain remotes.
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SEE ALSO
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--------
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- cdist(7)
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COPYING
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-------
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Copyright \(C) 2011 Nico Schottelius. Free use of this software is
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granted under the terms of the GNU General Public License version 3 (GPLv3).
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