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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">I am looking at patch #87a8c625 (US86444: patching scripts for neutron processes) which includes 2 parts, could you please help to clarify below question?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![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">Script to support neutron service restart:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">This is STX special script and no need for upstream<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![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">Metadata-proxy service lifecycle management: close metadata proxy (e.g. haproxy) process (if it is managed by dhcp client) when neutron-dhcp-agent stopped
<o:p></o:p></span></p>
<p class="MsoNormal"><span 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. <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">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><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">In my test:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![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">if metadata proxy is managed by l3 agent (default setting)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in"><span 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<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in;text-indent:-.25in;mso-list:l1 level1 lfo2">
<![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">if metadata proxy is managed by dhcp agent (set “force_metadata = true” in /etc/neutron/dhcp_agent.ini)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in"><span 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. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.25in"><span 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 style="color:#1F497D">169.254.169.254/16) is also valid in dhcp interface,
<b>does it expected behavior</b>?<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!<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"><o:p> </o:p></p>
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