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<p class="MsoNormal"><span style="color:#1F497D">Matt,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks much for the clarification!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Sorry for more questions:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l3 level1 lfo7">
<![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Current metadata proxy is managed by l3 agent or dhcp agent or both (e.g. there may be 3 haproxy processes co-exists in an environment with 1 route and 2 network). The STX patch is applied for dhcp
agent now, Does it also need the capability for l3 agent to stop the haproxy (managed by l3 agent) when stopped?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l3 level1 lfo7">
<![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">The patch has a side effect of disabling the metadata query capability (from vm instance) when dhcp agent stop, suppose this is expected behavior, right?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span style="color:#1F497D">Best Regards,<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="color:#1F497D">Le, Huifeng<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><a name="_____replyseparator"></a><b>From:</b> Peters, Matt [mailto:Matt.Peters@windriver.com]
<br>
<b>Sent:</b> Thursday, December 6, 2018 11:11 PM<br>
<b>To:</b> Le, Huifeng <huifeng.le@intel.com><br>
<b>Cc:</b> starlingx-discuss@lists.starlingx.io<br>
<b>Subject:</b> Re: Questions about patch 87a8c625 upstreaming<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-CA">Hello Huifeng,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I believe the use-case was having the ability to restart the metadata proxy in order to provide the ability to patch the software without a reboot. Therefore, in order to restart and/or reconfigure the metadata proxies
that are managed by the DHCP agent, then they needed to be restarted when the agent was restarted since there was no direct way to restart the individual proxies managed by that service.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">The DHCP agent will automatically configure and launch the metadata proxy if there are no virtual routers currently serving that network. This is controlled by the parameter enable_isolated_metadata and is configured
to be True by default for StarlingX. The force_metadata option can be used to always have the DHCP agent configure the metadata access but is not enabled by default (as you indicated).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">-Matt<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-CA" style="font-size:12.0pt;color:black">From:
</span></b><span lang="EN-CA" style="font-size:12.0pt;color:black">"Le, Huifeng" <<a href="mailto:huifeng.le@intel.com">huifeng.le@intel.com</a>><br>
<b>Date: </b>Wednesday, December 5, 2018 at 4:20 AM<br>
<b>To: </b>"Peters, Matt" <<a href="mailto:Matt.Peters@windriver.com">Matt.Peters@windriver.com</a>><br>
<b>Cc: </b>"<a href="mailto:starlingx-discuss@lists.starlingx.io">starlingx-discuss@lists.starlingx.io</a>" <<a href="mailto:starlingx-discuss@lists.starlingx.io">starlingx-discuss@lists.starlingx.io</a>><br>
<b>Subject: </b>Questions about patch 87a8c625 upstreaming<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D">Matt,</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D">I am looking at patch #87a8c625 (US86444: patching scripts for neutron processes) which includes 2 parts, could you please help to clarify below question?</span><span lang="EN-CA"><o:p></o:p></span></p>
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</span></span></span><![endif]><span lang="EN-CA" style="color:#1F497D">Script to support neutron service restart:
</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D">This is STX special script and no need for upstream</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D"> </span><span lang="EN-CA"><o:p></o:p></span></p>
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</span></span></span><![endif]><span lang="EN-CA" style="color:#1F497D">Metadata-proxy service lifecycle management: close metadata proxy (e.g. haproxy) process (if it is managed by dhcp client) when neutron-dhcp-agent stopped
</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D">To my understanding, metadata proxy (e.g. haproxy) provides support for VM instance to query its metadata information from Neutron which is in data-path plane, neutron-dhcp-agent is responsible for
configuring dhcp process (e.g. dnsmasq) or metadata proxy process which is lie in control-path plane. </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D">So it seems by design: whether the metadata-proxy process is alive is determined by the network/port status change instead of whether dhcp agent alive.
<b>Are there any special use cases which requires to stop metadata proxy process when dhcp agent stopped?
</b></span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D">In my test:</span><span lang="EN-CA"><o:p></o:p></span></p>
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</span></span></span><![endif]><span lang="EN-CA" style="color:#1F497D">if metadata proxy is managed by l3 agent (default setting)</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in"><span lang="EN-CA" style="color:#1F497D">Stopping(/Restarting) l3 agent will not stop(/restart) haproxy process and clear iptables rule, router can still work (in data path) and metadata information can
still be queried inside VM instance</span><span lang="EN-CA"><o:p></o:p></span></p>
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</span></span></span><![endif]><span lang="EN-CA" style="color:#1F497D">if metadata proxy is managed by dhcp agent (set “force_metadata = true” in /etc/neutron/dhcp_agent.ini)</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in"><span lang="EN-CA" style="color:#1F497D">Stopping(/Restarting) dhcp agent will not stop(/restart) dnsmasq process and haproxy process, dhcp server can still work (in data path) and metadata information can
still be queried inside VM instance. </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in"><span lang="EN-CA" style="color:#1F497D">If applying the patch, Stopping dhcp agent will make the metadata query within VM instance fail while the DHCP server can still work (or does it also need to be stopped?)
and metadata bridge information (e.g.</span><span lang="EN-CA"> <span style="color:#1F497D">
169.254.169.254/16) is also valid in dhcp interface, <b>does it expected behavior</b>?</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D">Thanks much!</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="color:#1F497D"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><b><i><span lang="EN-CA" style="color:#1F497D">Best Regards,</span></i></b><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><b><i><span lang="EN-CA" style="color:#1F497D">Le, Huifeng</span></i></b><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
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