On Wednesday, October 5, 2016 at 2:32:37 PM UTC-5, re-g...@wiu.edu wrote: > > I installed the puppet module saz-rsyslog from puppet forge. > I use The Foreman to configure nodes. The Foreman is used by puppet via > configuration [master] "external_nodes" "/etc/puppet/node.rb" > > Since the saz-rsyslog module install, I have been receiving the following > error off and on (not consistently) across many nodes on a puppet update > (i.e. puppet agent -t): > > "Could not retrieve catalog from remote server: Error 400 on SERVER: > Duplicate declaration: Class[Rsyslog] is already declared; cannot redeclare > on node <node-name>" > >
It seems highly unlikely that merely installing the module on the master would cause any catalog compilations to fail, and certainly the error message indicates that there are some declarations of its classes in play. It is not the mere presence of the module, but rather the declarations of one or more classes in it that is causing you trouble. > > My nodes are CentOS 5,6,7; and any various number of the nodes may > experience this issue, but not all of them at the same time. > > One day I will see dozens of server with this error, and other nodes not > having this issue. This may go on for days if I do not touch The Foreman. > I'll make some changes to host configuration for puppet module class > parameters in The Foreman - never the saz-rsyslog module though.. > After the changes, half or more of the servers having issue (not all) will > magically have no problems. > However, more nodes that did not have issues before, will now experience > this issue. > > Also, this change of events is not directly related to The Foreman host > configuration changes. > I can simply perform a puppet module upgrade to a unrelated module (e.g. > mine-yumconfig). After upgrading the unrelated module, again many nodes > with this issue will now have it resolved, and different ones not > experiencing the issue before will now begin experiencing it. > > > The only clue I have is from this posting: > http://grokbase.com/t/gg/puppet-users/165h0exgez/duplicate-resource-declaration-error > "... If you do not see the error on every run then it is modulated by > something that varies between runs. That could be almost anything: > manifests, data, results of function calls, node facts, or ENC output. ..." > > > Can anyone help me understand this issue, or help me get it resolved > permanently? > > When I search for answers, all I see are "You have written a duplicate > class in your module." > Any such claim is at best misleading. The problem is not that you or anyone has written a duplicate class, it's that the class in question has been *declared* more than once, and at least one of those declarations uses the resource-like style. In considering that, you should be aware that: - a declaration in resource-like style can include one emitted by your ENC (part of Foreman) if it uses the form that specifies class parameters explicitly, and - when one class inherits from another, any declaration of the derived class comprises an implicit declaration of its base class. Furthermore, - when class inheritance is involved, the docs <https://docs.puppet.com/puppet/4.7/reference/lang_classes.html#inheritance> specify that any parameters of the base class must either take their default values or have their values supplied by automatic external data lookup. In practice, that's too weak -- a separate resource-like declaration of the base class can cause trouble even if it specifies no parameter values. I talked up class inheritance because I've examined the manifests of the latest version of the module, and there are indeed a few cases of class inheritance that could be feeding your problem. There are also cases of ordinary declaration of class ::rsyslog by other classes in that module. The bottom line is that you need to follow the advice from the docs with respect to class ::rsyslog by avoiding declaring it via the resource-like style, including preventing your ENC from doing so. Any non-default parameters must be provided via automated data binding. I'm afraid I'm not knowledgeable enough about The Foreman to tell you how to handle that end, however. John -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/puppet-users/a9d669b0-b043-4ec3-91b6-4667d08b9c1b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
