website: debugging section
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layout: "docs"
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---
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# Debugging Packer
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Packer strives to be stable and bug-free, but issues inevitably arise where
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certain things may not work entirely correctly, or may not appear to work
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correctly. In these cases, it is sometimes helpful to see more details about
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what Packer is actually doing.
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Packer has detailed logs which can be enabled by setting the `PACKER_LOG`
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environmental variable to any value. This will cause detailed logs to appear
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on stderr. The logs contain log messages from Packer as well as any plugins
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that are being used. Log messages from plugins are prefixed by their application
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name.
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Note that because Packer is highly parallelized, log messages sometimes
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appear out of order, especially with respect to plugins. In this case,
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it is important to pay attention to the timestamp of the log messages
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to determine order.
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If you find a bug with Packer, please include the detailed log by using
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a service such as [gist](http://gist.github.com).
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<li><a href="/docs/builders/vmware.html">VMware</a></li>
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<li><a href="/docs/builders/custom.html">Custom</a></li>
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<li class="nav-header">Provisioners</a></li>
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<li class="nav-header">Provisioners</li>
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<li><a href="#">Shell Scripts</a></li>
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<li><a href="#">Custom</a></li>
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<li class="nav-header">Other</li>
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<li><a href="#">Core Configuration</a></li>
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<li><a href="/docs/other/debugging.html">Debugging</a></li>
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<li class="nav-header">Extend Packer</li>
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<li><a href="/docs/extend/plugins.html">Packer Plugins</a></li>
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<li><a href="/docs/extend/developing-plugins.html">Developing Plugins</a></li>
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