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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-510] Improve documentation on detecting ulimit problems and how to increase ulimits</title>
                <link>https://jira.mongodb.org/browse/DOCS-510</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;We get many support cases resulting from ulimits being too low, and some users have difficulties modifying them correctly.&lt;/p&gt;

&lt;p&gt;We have the following pages of documentation on the Wiki:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Too+Many+Open+Files&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Too+Many+Open+Files&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Production+Notes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Production+Notes&lt;/a&gt; (very brief mention of ulimit)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;and nothing yet that I am aware of in the manual.&lt;/p&gt;

&lt;p&gt;I believe that this documentation should be improved in the following ways:&lt;/p&gt;

&lt;p&gt;1. We should state that changes to ulimit do not take effect until after the process (e.g. the mongos) is restarted.&lt;/p&gt;

&lt;p&gt;2. The page on the Wiki only refers to open files (ulimit -n). I believe that another common limit we hit, and hence should document, is max user processes (ulimit -u), indicated by (at least) by &quot;can&apos;t create new thread&quot; errors such as the following:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Aug 14 04:21:36 [initandlisten] pthread_create failed: errno:11 Resource temporarily unavailable&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Tue Aug 14 04:21:36 [initandlisten] can&apos;t create new thread, closing connection&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;3. We should be more specific with what errors to look for in the log file. That is, &quot;If you see any of the following messages, increase &lt;tt&gt;ulimit -n&lt;/tt&gt;. If you see any of the following messages, increase {ulimit -u}}.&quot;&lt;/p&gt;

&lt;p&gt;4. We should provide more specific details for common distributions on how to permanently change ulimit settings (i.e. change them so that they are still in place after a server restart), including information on soft and hard limits. For example, something along the lines of &lt;a href=&quot;http://posidev.com/blog/2009/06/04/set-ulimit-parameters-on-ubuntu/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://posidev.com/blog/2009/06/04/set-ulimit-parameters-on-ubuntu/&lt;/a&gt;. We should state that it is a good idea to immediately restart the server after applying the limits, then check them, so that you know that they are in place.&lt;/p&gt;

&lt;p&gt;5. We should state that &lt;tt&gt;cat //proc/&amp;lt;pid&amp;gt;/limits&lt;/tt&gt; will tell you the limits on a running process, once you have its &amp;lt;pid&amp;gt;. That is, run &lt;tt&gt;ps auxww | grep mongo&lt;/tt&gt; first to get the pid.&lt;/p&gt;</description>
                <environment></environment>
        <key id="50193">DOCS-510</key>
            <summary>Improve documentation on detecting ulimit problems and how to increase ulimits</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="jantje.daniel">Ian Daniel</reporter>
                        <labels>
                    </labels>
                <created>Tue, 11 Sep 2012 08:03:54 +0000</created>
                <updated>Thu, 29 Nov 2012 16:35:05 +0000</updated>
                            <resolved>Mon, 1 Oct 2012 12:19:56 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="49071">DOCS-471</issuekey>
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            <issuekey id="49071">DOCS-471</issuekey>
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