Jesús Couto wrote:
Hi. I'm trying to do a test/proof of concept of Puppet as a tool to
manage our systems.
Hello, wow long mail. :)
In our enviroment we have several different instances of apache
running on each "webserver" machine, and several instances of tomcat
running in our "appservers" machines
I'm trying to duplicate that structure using Puppet on a Ubuntu
machine I'm using for testing, to no avail yet.
Isnt any well know recipe to do this? Or at least an idea about how to
go to achieve it?
So far what I've done is this:
- Define a class webserver that ensures the apache package is
installed and NOT running, and creates a directory for the instances
info to be stored
class webserver {
case $operatingsystem {
ubuntu: { $web_packages = "apache2" }
}
package { $web_packages: ensure => installed }
service { httpd:
name => $operatingsystem ? {
ubuntu => "apache2",
},
ensure => stopped,
enable => false,
}
file {"/etc/webinstances/":
ensure => directory,
owner => root,
group => root,
mode => 755,
}
}
- Include that class into a definition of "webinstance" that tries to
populate the directory of that instance from the puppet fileserver,
and start/stop a "base" service provider with a script generated from
a template:
define webinstance(owner,group,ensure = running) {
include webserver
file { "/etc/webinstances/$name/":
owner => $owner,
group => $group,
mode => 600,
ensure => directory,
recurse => true,
source => "puppet:///webinstances/$name/",
}
Sidenote: the above resource will not purge old files.
file { "/usr/sbin/start_$name.sh":
owner => root,
group => root,
mode => 700,
content => template("start_instance.erb"),
}
file { "/usr/sbin/stop_$name.sh":
owner => root,
group => root,
mode => 700,
content => template("stop_instance.erb"),
}
service { "$name":
ensure => $ensure,
provider => base,
start => "/usr/sbin/start_$name.sh",
stop => "/usr/sbin/stop_$name.sh",
status => "/usr/sbin/apache2 -f
/etc/webinstances/$name/apache2.conf -k sta
rt",
require => [
File["/etc/webinstances/$name"],File["/usr/sbin/start_$name.sh
"],File["/usr/sbin/stop_$name.sh"] ],
}
}
This sounds sane, with the possible addition of the
/etc/webinstances/$name/apache2.conf as a notify resource to restart the
service
- every node that needs to have an instance will define it
node staberinde {
webinstance { "uno":
owner => root,
group => root,
ensure => running,
}
webinstance { "dos":
owner => root,
group => root,
ensure => running,
}
}
... but appart from not getting the scripts to start & stop the
instances (it says the scripts "return 1" although I can run them from
the prompt without problem:
err: //Node[staberinde]/Webinstance[uno]/Service[uno]/ensure: change
from stopped to running failed: Could not start Service[uno]:
Execution of '/usr/sbin/start_uno.sh' returned 1: at
/etc/puppet/manifests/webinstance-definition.pp:31
The return value of the scripts should be 0. (check for exit statements
in the script)
Unfortunately the scripts are the fault here and they should return 0
for success and anything else for failure, this is the way puppet
figures out if everything went ok or not.
To check the return value of the scripts run them and then echo $? EX:
/usr/sbin/start_uno.sh
echo $?
Also make sure that the status is correct. (try running puppet wile the
services are running, and wile not, but I guess they are not since this
should install them, right?)
... the other thing that is making me think this is convoluted and
wrong is... what if I want the same instance in 2 nodes, as we do? can
I use the definition on both nodes with the same parameters and not
get an error cause I'm defining the same resource twice?
The only problem is using the same resource twice on the same node. You
can apply the same resource for each node you have if you wish.
Silviu
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