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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-12314] Warn when config servers are IP addresses</title>
                <link>https://jira.mongodb.org/browse/SERVER-12314</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is no good production use case for having config servers which are IP addresses, since any eventuality which causes any of the IP addresses to change requires downtime.  As such, we should issue a warning whenever a config string is encountered that contains an IP address.&lt;/p&gt;</description>
                <environment></environment>
        <key id="105452">SERVER-12314</key>
            <summary>Warn when config servers are IP addresses</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 Jan 2014 06:07:44 +0000</created>
                <updated>Thu, 25 Jun 2015 18:43:16 +0000</updated>
                            <resolved>Fri, 6 Mar 2015 17:04:10 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="480767" author="kevin.pulo@10gen.com" created="Mon, 13 Jan 2014 00:40:52 +0000"  >&lt;p&gt;Of course, VIPs, IP aliases, Elastic IPs and so forth can be used, where possible/available. Given sufficient care, it&apos;s also possible to mix localhost and non-localhost addresses - yet that is expressly forbidden.  This isn&apos;t about &quot;server knows best&quot;, this is just a request for a simple startup warning in mongos along the lines of &quot;Warning: config server string contains IP addresses. Consider using hostnames instead.&quot;.&lt;/p&gt;

&lt;p&gt;Load balancers are easy to misconfigure, since they are primarily intended for HTTP traffic.  Certainly no-one should ever be using load balancers in front of config servers (even though the heavily asymmetric load on config servers means that users may be enticed to try).&lt;/p&gt;

&lt;p&gt;These solutions are all more complex than using hostname resolution (whether by DNS or /etc/hosts), which is a well-established, well-understood solution that was designed from the outset to address this exact problem (among others).&lt;/p&gt;

&lt;p&gt;Most users are surprised to learn that simple string comparison is used on the config servers to determine same-ness, and that eg. &quot;foo:27017,bar:27017,baz:27017&quot; would be considered different to &quot;foo.example.com:27017,bar.example.com:27017,baz.example.com:27017&quot;, even though the actual servers might be the same (much less switching between IPs and hostnames).&lt;/p&gt;</comment>
                            <comment id="480330" author="scotthernandez" created="Fri, 10 Jan 2014 18:19:29 +0000"  >&lt;p&gt;It is possible to use a VIP and as such your assertion is not strictly true, and will be problematic for others. There are plenty of people using load-balancers and other network hardware which virtualize/abstracts the IP from the host much like using an alias (dns cname/a record).&lt;/p&gt;

&lt;p&gt;Deciding that the server knows best in this case is very questionable, and might cause even more confusion for those following their networking best practices internally which use ip addresses.&lt;/p&gt;</comment>
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