how to perform in puppet: service start - mod config - service restart

[Lito K]

Hi everyone,

I have the following scenario:

I have an app.war file that needs to be expanded in tomcat, this war file creates a new directory at /app/{data,config,profile}.

I need to change a file in /app/config/server.properties after the war expansion.

I need to restart tomcat to refresh the config update.

I tried this sequence:

copy app.war in webapps

run tomcat, the war expanded

change config

refresh tomcat

In puppet, it becomes:

file {"/tmp/app.war":

  ensure => "present",

  path => "/tomcat/webapps/app.war",

  owner => "tomcat",

  group => "tomcat",

  before => Service["tomcat"],

}

service { "tomcat":

  ensure => "running",

  enable => true,

  subscribe => File["/app/config/server.properties"],

}

file {"/app/config/server.properties":

  ensure => "present",

  source => "/tmp/newconfig/server.properties",

  owner => "tomcat",

  group => "tomcat",

  notify => Service["tomcat"],

}

I keep getting this error:

err: Could not apply complete catalog: Found 1 dependency cycle:

(File[/app/config/server.properties] => Service[tomcat] => File[/app/config/server.properties])

Cycle graph written to /var/lib/puppet/state/graphs/cycles.dot.

I was wondering if someone can give me a hint how to solve this dependency cycle issue.

My understanding:

Tomcat subscribes to config file (meaning it will be refreshed if there's a change in the config file)

The config file change, then it notifies tomcat.

Tomcat picks up the notification, it then refreshes.

I don't see where the cycle happens???

I am fairly new to puppet, so any explanation would help.

Many thanks.

Puppet client: 2.7.25-2 (from EPEL, latest for CENTOS 6)

OS: Redhat 6.4 64bit

[Josh Cooper]

You'll want either the subscribe or notify relationship between the service and file, but not both as that creates a dependency cycle.

I keep getting this error:

err: Could not apply complete catalog: Found 1 dependency cycle:

(File[/app/config/server.properties] => Service[tomcat] => File[/app/config/server.properties])

Cycle graph written to /var/lib/puppet/state/graphs/cycles.dot.

I was wondering if someone can give me a hint how to solve this dependency cycle issue.

My understanding:

Tomcat subscribes to config file (meaning it will be refreshed if there's a change in the config file)

The config file change, then it notifies tomcat.

Tomcat picks up the notification, it then refreshes.

I don't see where the cycle happens???

I am fairly new to puppet, so any explanation would help.

Many thanks.

Puppet client: 2.7.25-2 (from EPEL, latest for CENTOS 6)

OS: Redhat 6.4 64bit

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[Felix Frank]

On 04/28/2014 08:24 AM, Lito K wrote:
> I was wondering if someone can give me a hint how to solve this
> dependency cycle issue.

Every resource is synced and/or refreshed at a set time during catalog
evaluation. You cannot have multiple refreshes of the same resource.

Therefor, the usual workaround is to model either action via exec
instead of the proper service resource, e.g.

1. war-file deployment
2. exec tomcat-start
3. config-file management
4. service refresh

By the way, are you certain that the war-file will be completely
extracted when the tomcat start routine hands the control back? I would
assume the such things go on in the background, and that puppet would
race with tomcat. If so, the config-file may in fact not yet be in place
when the file resource is getting synced.

HTH,
Felix

[Johan De Wit]

I create an rpm, where I unpack the war to the right location, and
deploy it that way.
And then you just have a simple package - file(s) - service pattern.

(using tomcat6)

Makes life much easier ...

hth

Greats

johan


--
Johan De Wit

Open Source Consultant

Red Hat Certified Engineer (805008667232363)
Puppet Certified Professional 2013/2014 (PCP0000006)
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