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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-5700] Call res_init() after a failure of getaddrinfo() </title>
                <link>https://jira.mongodb.org/browse/DOCS-5700</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;We should call res_init() on Linux systems after failure in getaddrinfo().&lt;/p&gt;

&lt;p&gt;Handle cases when the DNS resolver has been changed by resetting the cache.&lt;/p&gt;

&lt;p&gt;Should ideally be fixed in glibc but do not think they will as outlined &lt;a href=&quot;http://sourceware.org/bugzilla/show_bug.cgi?id=3675&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://sourceware.org/bugzilla/show_bug.cgi?id=3675&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;====== DOCS CHANGE =======&lt;/p&gt;

&lt;p&gt;This is a minor issue effecting DNS on RedHat derivative linux distributions due to an implementation choice in GLIBC in those distributions. The issue is, if you make changes to the DNS resolver underneath MongoDB you will need to restart your database under any RHEL based Linux. &lt;/p&gt;

&lt;p&gt;This does not effect Debian derivatives as they use a patched version of GLIBC.&lt;/p&gt;</description>
                <environment></environment>
        <key id="55594">DOCS-5700</key>
            <summary>Call res_init() after a failure of getaddrinfo() </summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="david.hows">David Hows</reporter>
                        <labels>
                            <label>groom</label>
                    </labels>
                <created>Thu, 8 Nov 2012 03:38:05 +0000</created>
                <updated>Mon, 30 Oct 2023 22:34:14 +0000</updated>
                            <resolved>Fri, 3 Nov 2017 13:44:24 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>4</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="430289" author="joao@comoyo.com" created="Tue, 24 Sep 2013 12:29:59 +0000"  >&lt;p&gt;I&apos;ve just been bit by a issue that would probably have been solved by this.&lt;/p&gt;

&lt;p&gt;We&apos;re using 10gen/mongodb provided packages and the upstart configuration starts the server in run levels 2, 3, 4 and 5 with no other dependencies. In our case a slow dhcp seems to be racing with mongodb startup to the point where a broken (or non-existing) resolv.conf is sometimes picked up.&lt;/p&gt;

&lt;p&gt;In our case, delaying server startup until the network is up, or later in the boot process, would probably help as well.&lt;/p&gt;</comment>
                            <comment id="275890" author="jdunn@secondmarket.com" created="Tue, 26 Feb 2013 04:56:19 +0000"  >&lt;p&gt;I wouldn&apos;t characterize it as &quot;recommends&quot;. It&apos;s a workaround, certainly, but RedHat&apos;s own documentation states that &quot;using both services can result in unexpected behavior&quot;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/usingnscd-sssd.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/usingnscd-sssd.html&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="275886" author="akshay" created="Tue, 26 Feb 2013 04:51:30 +0000"  >&lt;p&gt;It is what RedHat recommends for SSSD and is an immediate fix for the problem at hand.&lt;/p&gt;</comment>
                            <comment id="275857" author="jdunn@secondmarket.com" created="Tue, 26 Feb 2013 03:47:01 +0000"  >&lt;p&gt;Well, that&apos;s certainly possible, but I just don&apos;t think it&apos;s a good idea to prescribe to customers what name service caching daemon(s) they have to run in order to use MongoDB. nscd and sssd are known to not coexist well together.&lt;/p&gt;</comment>
                            <comment id="275853" author="akshay" created="Tue, 26 Feb 2013 03:42:29 +0000"  >&lt;p&gt;What about something like this so you you are using NSCD only for host entries and SSSD handles the rest?&lt;/p&gt;

&lt;p&gt;enable-cache hosts yes&lt;br/&gt;
enable-cache passwd no&lt;br/&gt;
enable-cache group no&lt;br/&gt;
enable-cache netgroup no&lt;/p&gt;</comment>
                            <comment id="275849" author="jdunn@secondmarket.com" created="Tue, 26 Feb 2013 03:34:16 +0000"  >&lt;p&gt;Unfortunately, Akshay, nscd conflicts with sssd which is what we use for unified authentication with Active Directory. So this isn&apos;t really a solution.&lt;/p&gt;</comment>
                            <comment id="275846" author="akshay" created="Tue, 26 Feb 2013 03:31:07 +0000"  >&lt;p&gt;You can avoid the whole problem by just running nscd which is already a dependency for NetworkManger, nss-ldap, NIS+ among other things. nscd will discover /etc/resolv.conf changes and invalidate the database.&lt;/p&gt;

&lt;p&gt;check-files   hosts   yes&lt;/p&gt;

&lt;p&gt;in nscd.conf&lt;/p&gt;

&lt;p&gt;Maybe even add nscd as a package dependency for the mongodb rpms.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="83974">SERVER-10375</issuekey>
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            <issuekey id="111100">SERVER-12741</issuekey>
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