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<title>Troubleshooting OpenStack Compute</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"/><link rel="home" href="index.html" title="OpenStack Compute Administration Manual"/><link rel="up" href="ch10.html" title="Chapter 10. Support and Troubleshooting"/><link rel="prev" href="ch10s02.html" title="Troubleshooting OpenStack Object Storage"/><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><script type="text/javascript">

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<a accesskey="u" class="navLinkUp" href="ch10.html">Up</a></td></tr></table></div></div><div id="content"><div class="section" title="Troubleshooting OpenStack Compute"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="d5e820"/>Troubleshooting OpenStack Compute</h2></div></div></div>

<div class="section" title="Log files for OpenStack Compute"><div class="titlepage"><div><div><h3 class="title"><a id="d5e822"/>Log files for OpenStack Compute</h3></div></div></div><p>Log files are stored in /var/log/nova and there is a log file for each service, for example nova-compute.log. You can format the log strings using flags for the nova.log module. The flags used to set format strings are: logging_context_format_string and logging_default_format_string. If the log level is set to debug, you can also specify logging_debug_format_suffix to append extra formatting. For information about what variables are available for the formatter see: http://docs.python.org/library/logging.html#formatter </p>

<p>You have two options for logging for OpenStack Compute based on configuration settings. In nova.conf, include the --logfile flag to enable logging. Alternatively you can set --use_syslog=1, and then the nova daemon logs to syslog.</p></div>

<div class="section" title="Common Errors and Fixes for OpenStack Compute"><div class="titlepage"><div><div><h3 class="title"><a id="d5e826"/>Common Errors and Fixes for OpenStack Compute</h3></div></div></div>

<p>The Launchpad Answers site offers a place to ask and answer questions, and you can also mark questions as frequently asked questions. This section describes some errors people have posted to Launchpad Answers and IRC. We are constantly fixing bugs, so online resources are a great way to get the most up-to-date errors and fixes.</p>

<p>Credential errors, 401, 403 forbidden errors</p>

<p>A 403 forbidden error is caused by missing credentials. Through current installation methods, there are basically two ways to get the novarc file. The manual method requires getting it from within a project zipfile, and the scripted method just generates novarc out of the project zip file and sources it for you. If you do the manual method through a zip file, then the following novarc alone, you end up losing the creds that are tied to the user you created with nova-manage in the steps before.</p>

<p>When you run nova-api the first time, it generates the certificate authority information, including openssl.cnf. If it gets started out of order, you may not be able to create your zip file. Once your CA information is available, you should be able to go back to nova-manage to create your zipfile. </p><p>You may also need to check your proxy settings to see if they are causing problems with the novarc creation.</p>

<p>Instance errors</p>

<p>Sometimes a particular instance shows "pending" or you cannot SSH to it. Sometimes the image itself is the problem. For example, when using flat manager networking, you do not have a dhcp server, and an ami-tiny image doesn't support interface injection so you cannot connect to it. The fix for this type of problem is to use an Ubuntu image, which should obtain an IP address correctly with FlatManager network settings. To troubleshoot other possible problems with an instance, such as one that stays in a spawning state, first check your instances directory for i-ze0bnh1q dir to make sure it has the following files:</p>

<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>libvirt.xml</p></li><li class="listitem"><p>disk</p></li><li class="listitem"><p>disk-raw</p></li><li class="listitem"><p>kernel</p></li><li class="listitem"><p>ramdisk</p></li><li class="listitem"><p>console.log (Once the instance actually starts you should see a console.log.)</p></li></ul></div>

<p>Check the file sizes to see if they are reasonable. If any are missing/zero/very small then nova-compute has somehow not completed download of the images from objectstore. </p>

<p>Also check nova-compute.log for exceptions. Sometimes they don't show up in the

console output. </p><p>

Next, check the /var/log/libvirt/qemu/i-ze0bnh1q.log file to see if it exists and has any useful error messages in it.</p>

<p>Finally, from the instances/i-ze0bnh1q directory, try <code class="code">virsh create libvirt.xml</code> and see if you get an error there.</p>

</div></div><script type="text/javascript" src="../common/main.js"></script><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch10s02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch10.html">Up</a></td><td width="40%" align="right"> </td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></div><div><div id="leftnavigation" style="padding-top:3px; background-color:white;"><div id="tabs"><ul><li><a href="#treeDiv"><span class="contentsTab">Contents</span></a></li><li><a href="#searchDiv"><span class="searchTab">Search</span></a></li></ul><div id="treeDiv"><img src="../common/images/loading.gif" alt="loading table of contents..." id="tocLoading" style="display:block;"/><div id="ulTreeDiv" style="display:none"><ul id="tree" 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Relevant Services on the Compute Node</a></span></li></ul></li></ul></li><li><span class="file"><a href="ch04s03.html">Configuring OpenStack Compute</a></span><ul><li><span class="file"><a href="ch04s03.html#d5e260">Set Up OpenStack Compute Environment on the Compute Node</a></span></li><li><span class="file"><a href="ch04s03.html#d5e269">Create Certifications</a></span></li><li><span class="file"><a href="ch04s03.html#d5e276">Setting Flags in the nova.conf File</a></span></li><li><span class="file"><a href="ch04s03.html#d5e336">Enable Access to VMs on the Compute Node</a></span></li></ul></li></ul></li><li><span class="file"><a href="ch05.html">Installing and Configuring OpenStack Imaging Service</a></span><ul><li><span class="file"><a href="ch05s01.html">System Requirements</a></span></li><li><span class="file"><a href="ch05s02.html">Installing OpenStack Imaging Service on Ubuntu </a></span><ul><li><span class="file"><a href="ch05s02.html#d5e361">Example Installation 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Compute</a></span><ul><li><span class="file"><a href="ch07s01.html">Understanding How Compute Runs Clouds</a></span></li><li><span class="file"><a href="ch07s02.html">Understanding the Compute Service Architecture</a></span><ul><li><span class="file"><a href="ch07s02.html#d5e474">API Server</a></span></li><li><span class="file"><a href="ch07s02.html#d5e478">Message Queue</a></span></li><li><span class="file"><a href="ch07s02.html#d5e482">Compute Worker</a></span></li><li><span class="file"><a href="ch07s02.html#d5e498">Network Controller</a></span></li><li><span class="file"><a href="ch07s02.html#d5e508">Volume Workers</a></span></li></ul></li><li><span class="file"><a href="ch07s03.html">Managing the Cloud</a></span><ul><li><span class="file"><a href="ch07s03.html#d5e523">Using the nova-manage command</a></span></li></ul></li><li><span class="file"><a href="ch07s04.html">Managing Compute Users</a></span><ul><li><span class="file"><a 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Cloud</a></span><ul><li><span class="file"><a href="ch09s01.html#d5e668">Part I: Setting Up the Cloud Infrastructure</a></span><ul><li><span class="file"><a href="ch09s01.html#d5e671">Configuring the network</a></span></li><li><span class="file"><a href="ch09s01.html#d5e693">Ensure the Database is Up-to-date</a></span></li><li><span class="file"><a href="ch09s01.html#d5e697">Creating a user</a></span></li><li><span class="file"><a href="ch09s01.html#d5e704">Creating a project and related credentials</a></span></li></ul></li><li><span class="file"><a href="ch09s01.html#d5e720">Part II: Getting Virtual Machines to Run the Virtual Servers</a></span></li><li><span class="file"><a href="ch09s01.html#d5e731">Part III: Installing the Needed Software for the Web-Scale Scenario</a></span><ul><li><span class="file"><a href="ch09s01.html#d5e740">On the first VM, install Wordpress</a></span></li><li><span class="file"><a href="ch09s01.html#d5e750">On a second VM, install 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