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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-50866] systemd unit mongod.service should use &quot;After=network-online.target&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-50866</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the systemd unil file &lt;tt&gt;mongod.service&lt;/tt&gt; waits for the &lt;tt&gt;network.target&lt;/tt&gt; to be reached, via the line &lt;tt&gt;After=network.target&lt;/tt&gt;. However, most Linux distributions with systemd support &lt;tt&gt;network-online.target&lt;/tt&gt;, which is a better indicator that the network is up and available for MongoDB. When only waiting on &lt;tt&gt;network.target&lt;/tt&gt;, it is possible that the mongod service fails to start upon system reboot.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this systemd documentation page&lt;/a&gt; for a more detailed explanation.&lt;/p&gt;

&lt;p&gt;We suggest changing the &lt;tt&gt;mongod.service&lt;/tt&gt; file to specify:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1469748">SERVER-50866</key>
            <summary>systemd unit mongod.service should use &quot;After=network-online.target&quot;</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="ryan.egesdahl@mongodb.com">Ryan Egesdahl</assignee>
                                    <reporter username="spencer.brown@mongodb.com">Spencer Brown</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Sep 2020 17:48:05 +0000</created>
                <updated>Sun, 29 Oct 2023 22:03:22 +0000</updated>
                            <resolved>Tue, 29 Sep 2020 04:09:27 +0000</resolved>
                                                    <fixVersion>4.8.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3433456" author="xgen-internal-githook" created="Wed, 7 Oct 2020 23:29:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ryan Egesdahl&apos;, &apos;email&apos;: &apos;ryan.egesdahl@mongodb.com&apos;, &apos;username&apos;: &apos;deriamis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50866&quot; title=&quot;systemd unit mongod.service should use &amp;quot;After=network-online.target&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50866&quot;&gt;&lt;del&gt;SERVER-50866&lt;/del&gt;&lt;/a&gt; SystemD unit should wait for network-online.target&lt;/p&gt;

&lt;p&gt;We were previously waiting for network.target, which does not actually&lt;br/&gt;
mean the network interface will be up and have an IP address assigned.&lt;br/&gt;
During some reboots, it&apos;s possible that mongod would start up before the&lt;br/&gt;
network interface was fully online, and this caused startup failures if&lt;br/&gt;
mongod was configured to listen on a specific IP address. Now we wait&lt;br/&gt;
for network-online.target instead to ensure the IP address is available&lt;br/&gt;
when mongod starts.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3dc3db0d78d4d8851ad50dd52ee51fed84ecc7e0)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca633f01d864257ff9b75c129421c9d4ecccc937&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca633f01d864257ff9b75c129421c9d4ecccc937&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3415503" author="xgen-internal-githook" created="Tue, 29 Sep 2020 03:44:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ryan Egesdahl&apos;, &apos;email&apos;: &apos;ryan.egesdahl@mongodb.com&apos;, &apos;username&apos;: &apos;deriamis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50866&quot; title=&quot;systemd unit mongod.service should use &amp;quot;After=network-online.target&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50866&quot;&gt;&lt;del&gt;SERVER-50866&lt;/del&gt;&lt;/a&gt; SystemD unit should wait for network-online.target&lt;/p&gt;

&lt;p&gt;We were previously waiting for network.target, which does not actually&lt;br/&gt;
mean the network interface will be up and have an IP address assigned.&lt;br/&gt;
During some reboots, it&apos;s possible that mongod would start up before the&lt;br/&gt;
network interface was fully online, and this caused startup failures if&lt;br/&gt;
mongod was configured to listen on a specific IP address. Now we wait&lt;br/&gt;
for network-online.target instead to ensure the IP address is available&lt;br/&gt;
when mongod starts.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3dc3db0d78d4d8851ad50dd52ee51fed84ecc7e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3dc3db0d78d4d8851ad50dd52ee51fed84ecc7e0&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>This change may affect how the service starts and stops on systemd Linux distros.&lt;br/&gt;
&lt;br/&gt;
This is so any configurations which bind to a specific IP address can be supported properly. Before this change, the service may have failed to start because it came online before the network interface was configured with an IP address. Now, systemd will wait to start the service until after all network interfaces are configured or have failed to be configured. In cases where DHCP is used to configure a network interface, this may introduce a short delay in startup until network interface configuration either succeeds or fails.&lt;br/&gt;
&lt;br/&gt;
Another result of this change is that mongod state is based on the networking state in systemd. Shutting down network services via systemd will now also stop mongod, and starting the network interface back up will start mongod again. This situation is extremely rare and does not usually happen except during OS shutdown and restart, or when a sysadmin would have intended all services to be unavailable (such as single-user mode).</customfieldvalue>

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