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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-11311] SNMP: multiple hosts on same port collide snmpwalk namespace</title>
                <link>https://jira.mongodb.org/browse/SERVER-11311</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a replica set of SNMP subagents are all running on the same port on different hosts, then SNMP responses are ambiguous - only one &quot;27017&quot; entry is returned, and for which member appears to be arbitrary.&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;
		&lt;tbody &gt;
				&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-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;...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::globalOpInsert.&quot;27017&quot; = Counter32: 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::globalOpQuery.&quot;27017&quot; = Counter32: 60&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::globalOpUpdate.&quot;27017&quot; = Counter32: 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::globalOpDelete.&quot;27017&quot; = Counter32: 0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;...&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::replSetName.&quot;27017&quot; = STRING: &quot;snmpd&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::replSetVersion.&quot;27017&quot; = INTEGER: 3&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::replIsMaster.&quot;27017&quot; = INTEGER: 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::replIsSecondary.&quot;27017&quot; = INTEGER: 0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;MONGO-MIB::replPrimary.&quot;27017&quot; = STRING: &quot;hostA:27017&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;MONGO-MIB::replMe.&quot;27017&quot; = STRING: &quot;hostA:27017&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Furthermore, if the replica set member identified by the &lt;tt&gt;MONGO-MIB::replMe&lt;/tt&gt; field is brought down (in the above example, say hostA:27017 becomes unavailable), then the &lt;tt&gt;snmpwalk&lt;/tt&gt; becomes unresponsive - does not return any results from any of the other members.&lt;/p&gt;

&lt;p&gt;This behavior would seem to limit the utility of the subagent model given a &quot;typical&quot; replica set deployment. However of course a workaround exists to always utilize a distinct set of ports when using SNMP.&lt;/p&gt;</description>
                <environment>* EC2, Amazon Linux, m1.medium&lt;br/&gt;
* PSS replica set&lt;br/&gt;
* All mongod instances running as SNMP subagents, reporting to {{snmpd}} functioning as SNMP master</environment>
        <key id="95312">SERVER-11311</key>
            <summary>SNMP: multiple hosts on same port collide snmpwalk namespace</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="john.morales@mongodb.com">John Morales</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Tue, 22 Oct 2013 21:16:14 +0000</created>
                <updated>Wed, 10 Dec 2014 23:14:54 +0000</updated>
                            <resolved>Thu, 24 Oct 2013 13:41:39 +0000</resolved>
                                    <version>2.5.3</version>
                                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="445985" author="milkie" created="Thu, 24 Oct 2013 13:41:39 +0000"  >&lt;p&gt;After some internal discussion, we decided that our recommendation is not to use subagents over the network.  mongod as a subagent should only connect to a local snmp master.  Therefore, the port number should always be a way to uniquely identify a mongod.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;0.) Install standard pre-req packages for SNMP.&lt;br/&gt;
1.) Edit /etc/snmp/snmpd.conf and /etc/snmp/mongod.conf config files for subagent connection to &lt;tt&gt;snmpd&lt;/tt&gt; through TCP:1705.&lt;br/&gt;
2.) Start up snmpd daemon.&lt;br/&gt;
3.) Launch a PSS replica set, with each running with &lt;tt&gt;--snmp-subagent&lt;/tt&gt; on a distinct host and same port.&lt;br/&gt;
3.) Run snmpwalk against the agentaddress defined for your running snmpd daemon&lt;br/&gt;
&lt;tt&gt;snmpwalk -m MONGO-MIB -v 2c -c mongodb ec2-foo-bar.amazonaws.com:1161 1.3.6.1.4.1.34601&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;Actual command-line flags used for each host:&lt;br/&gt;
PRI: &lt;tt&gt;./bin/mongod --replSet snmpd --snmp-subagent --port 27017 --fork --dbpath data/snmpd-0/ --logpath logs/snmpd-0/mongod.log --smallfiles --nohttpinterface --oplogSize=50&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;SEC: &lt;tt&gt;./bin/mongod --replSet snmpd --snmp-subagent --port 27017 --fork --dbpath data/snmpd-2/ --logpath logs/snmpd-2/mongod.log --smallfiles --nohttpinterface --oplogSize=50&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;SEC: &lt;tt&gt;./bin/mongod --replSet snmpd --snmp-subagent --port 27017 --fork --dbpath data/snmpd-4/ --logpath logs/snmpd-4/mongod.log --smallfiles --nohttpinterface --oplogSize=50&lt;/tt&gt;&lt;/p&gt;</customfieldvalue>

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