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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>[SERVER-6837] Persist mongod server options in dbpath for sanity checking across reboots</title>
                <link>https://jira.mongodb.org/browse/SERVER-6837</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongod should store its startup options in a file in the dbpath, so that we can check on startup whether our current options are different from our previous options in a possibly dangerous way. Here&apos;s why: for some server options, toggling them across mongod reboots can lead to badness that it&apos;d probably be worthwhile to try to detect, at least so we can warn about the settings change at startup, if not more. For example:&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;--directoryperdb toggling this across mongod reboots without also moving files around causes the mongod to start up with an empty set of databases, which can be construed as a data loss situation.&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;--replSet toggling this per se isn&apos;t a problem, but frobbing other flags when restarting a process that was previously a replica set member can create problems. Occasionally people rebuild their data files after a crash by starting with --repair, which, due of the nature of --repair, can lead to data skew among replica set members. And changing --bind_ip or --port on a mongod that was a replica set member will cause that process to operate independent of the replica set.&lt;/span&gt;&lt;/pre&gt;
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					&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;--auth/--noauth toggling auth will either break people&apos;s programs or invalidate people&apos;s security.&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;There are probably other combinations I&apos;m not remembering. The ways these server flags tend to get toggled across reboots have included situations where config files got garbled into a deployment (e.g., the operator used a customized config file, but something replaced the config file by the time the mongod got rebooted), and cases where, during an emergency or operational transition scenario, an operator starts up a mongod with manually specified flags, possibly the wrong ones).&lt;/p&gt;

&lt;p&gt;Relatedly, in the mongos, changing the configdb parameter (especially from 3 configsvrs to 1) could be very bad. Unfortunately the mongos doesn&apos;t have a dbpath, so preserving old options isn&apos;t obviously easy. &lt;/p&gt;</description>
                <environment></environment>
        <key id="47976">SERVER-6837</key>
            <summary>Persist mongod server options in dbpath for sanity checking across reboots</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="richard.kreuter">Richard Kreuter</reporter>
                        <labels>
                    </labels>
                <created>Thu, 23 Aug 2012 17:56:56 +0000</created>
                <updated>Tue, 6 Dec 2022 05:30:08 +0000</updated>
                            <resolved>Wed, 6 Mar 2019 03:51:21 +0000</resolved>
                                                                    <component>Usability</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
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