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書名： Puppet 2.7 Cookbook
作者名： John Arundel
本章字數： 590字
更新時間： 2021-04-02 18:19:56

Deploying changes with Rake

Like everyone who makes his living with a keyboard, I hate unnecessary typing. If you are using the workflow described in the section on using version control, you can add some automation to make this process a little easier. There are several tools that can run commands for you on remote servers, including Capistrano and Fabric, but for this example we'll use Rake.

Getting ready

If you don't have Rake installed already, run the following command:

apt-get install rake

You'll need a working Internet connection.

How to do it...

Create a file in the top level of your Puppet working copy named Rakefile that looks like this:

PUPPETMASTER = 'cookbook'
SSH = 'ssh -t -A'

task :deploy do
    sh "git push"
    sh "#{SSH} #{PUPPETMASTER} 'cd /etc/puppet && sudo git pull'"
end

When you make changes in your working copy of the Puppet manifests, you can simply run:
```
$ rake deploy
```

Rake will take care of updating the Git repo and refreshing the Puppetmaster's working copy for you:

$ git push
Counting objects: 4, done.
Delta compression using 2 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 452 bytes, done.
Total 3 (delta 0), reused 0 (delta 0)
To ssh:/ /git@cookbook.bitfieldconsulting.com/var/git/cookbook
 561e5a6..a8b8c76 master -> master
ssh -A -l root cookbook 'cd /etc/puppet && git pull'
From ssh://cookbook.bitfieldconsulting.com/var/git/cookbook
 561e5a6..a8b8c76 master -> origin/master
Updating 561e5a6..a8b8c76
Fast-forward
 Rakefile | 6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
 create mode 100644 Rakefile

You can also add a Rake task to run Puppet on the client machine:

task :apply => [:deploy] do
    client = ENV['CLIENT']
    sh "#{SSH} #{client} 'sudo puppet agent --test'" do |ok, status|
        puts case status.exitstatus
            when 0 then "Client is up to date."
            when 1 then "Puppet couldn't compile the manifest."
            when 2 then "Puppet made changes."
            when 4 then "Puppet found errors."
        end
    end
end

When you want to test your changes on the client machine, run the following command:
```
rake CLIENT=cookbook apply
```

Replace cookbook with the name of the client machine, or set the CLIENT environment variable so that Rake knows which machine to run Puppet on.

info: Caching catalog for cookbook
info: Applying configuration version '1292865016'
info: Creating state file /var/lib/puppet/state/state.yaml
notice: Finished catalog run in 0.03 seconds

If you want to see what changes Puppet would make, without actually changing anything, use the --noop flag:

task :noop => [:deploy] do
    client = ENV['CLIENT']
    sh "#{SSH} #{client} 'sudo puppet agent --test --noop'"
end

Now you can run:
```
 $ rake noop
```
This will show you a preview of the changes.

How it works...

A Rakefile consists of a series of tasks, identified by the task keyword. The task definition is a set of steps, in this case the sequence of shell commands required to push your manifest changes to the master repo, and update the Puppetmaster's working copy.

Tasks can be linked, so that one depends on the other. For example, in our Rakefile the apply task is linked to deploy, so that whenever you run rake apply, Rake will make sure the deploy task is done first, and the apply task next.

There's more...

You can extend this Rakefile to automate more tasks, including running a syntax check on the Puppet manifests before updating them, and even bootstrapping a new machine with Puppet. Rake is a powerful tool and can be a big help in managing a large network with Puppet.

官术网_书友最值得收藏!

Deploying changes with Rake

Getting ready

How to do it...

How it works...

There's more...

See also

官术网_书友最值得收藏!

Puppet 2.7 Cookbook

Deploying changes with Rake

Getting ready

How to do it...

How it works...

There's more...

See also