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slides.html
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<h1>Deploying Erlang Services at Mochi</h1>
</div>
</div>
<div class="presentation">
<div class="slide" id="slide0">
<h1 class="title">Deploying Erlang Services at Mochi</h1>
<table class="docinfo" frame="void" rules="none">
<col class="docinfo-name" />
<col class="docinfo-content" />
<tbody valign="top">
<tr><th class="docinfo-name">Author:</th>
<td>Bob Ippolito (@etrepum)</td></tr>
<tr><th class="docinfo-name">Date:</th>
<td>October 2010</td></tr>
<tr class="field"><th class="docinfo-name">Venue:</th><td class="field-body">ECUG 2010 (Beijing)</td>
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<div class="slide" id="mochi-media">
<h1>Mochi Media</h1>
<ul class="simple">
<li>Gaming platform (monetization, social, …)</li>
<li>Erlang, Python, JavaScript, ActionScript 2 and 3</li>
<li>Subsidiary of Shanda Games (盛大游戏)</li>
<li>Mochi US (San Francisco)</li>
<li>Mochi China (Shanghai)</li>
</ul>
</div>
<div class="slide" id="why-erlang">
<h1>Why Erlang?</h1>
<ul class="simple">
<li>Straightforward network programming</li>
<li>Multi-core, multi-node</li>
<li>Reliable VM and standard library</li>
<li>Hot code loading</li>
<li>Pattern matching + binaries</li>
</ul>
</div>
<div class="slide" id="how-much-erlang">
<h1>How much Erlang</h1>
<ul class="simple">
<li>2 internal libraries</li>
<li>18 internal services</li>
<li>10 open source projects (4 by Mochis)</li>
</ul>
</div>
<div class="slide" id="what-s-not-erlang">
<h1>What's not Erlang</h1>
<ul class="simple">
<li>Most scripts</li>
<li>Anything that speaks HTML</li>
<li>Anything that speaks to SQL db</li>
<li>Off the shelf software (nginx, PostgreSQL, …)</li>
</ul>
</div>
<div class="slide" id="developer-tools">
<h1>Developer Tools</h1>
<ul class="simple">
<li>"/mochi" for Mac OS X (localdev) and CentOS (prod)</li>
<li>mostly git, actively hunting down legacy svn</li>
<li>Erlang R13B04 (R14B soon)</li>
<li>Editor of choice (but mostly Emacs-based)</li>
</ul>
</div>
<div class="slide" id="mochi">
<h1>"/mochi"</h1>
<ul class="simple">
<li>Full pre-built development toolchain</li>
<li>Erlang R13B04, Python, etc.</li>
<li>Same structure for CentOS and Mac OS X</li>
<li>Also includes internal scripts and shell profile</li>
</ul>
</div>
<div class="slide" id="erlang-common-library">
<h1>Erlang Common Library</h1>
<ul class="simple">
<li>OTP (of course!)</li>
<li>mochierl_lib (internal)</li>
<li>open source dependencies (mochiweb, …)</li>
<li>rebar (build tool of choice)</li>
</ul>
</div>
<div class="slide" id="testing-tools">
<h1>Testing Tools</h1>
<ul class="simple">
<li>eunit</li>
<li>effigy</li>
<li>meck (a better effigy)</li>
<li><tt class="docutils literal">./rebar skip_deps=true eunit</tt></li>
</ul>
</div>
<div class="slide" id="rebar">
<h1>Rebar</h1>
<ul class="simple">
<li>Each project gets a rebar.config</li>
<li>Dependencies all on internal git</li>
<li>Internal git mirrors of open source projects, updated daily</li>
<li>Some config customizations</li>
</ul>
</div>
<div class="slide" id="rebar-config">
<h1>rebar.config</h1>
<pre class="literal-block">
{erl_opts, [debug_info]}.
{deps, […]}.
{cover_enabled, true}.
{eunit_opts,
[verbose,
{report,{eunit_surefire,[{dir,"."}]}}]}.
{mib_opts, [{group_check, false}]}.
</pre>
</div>
<div class="slide" id="future-rebar">
<h1>Future Rebar</h1>
<ul class="simple">
<li>Better support for having internal mirrors of open source</li>
<li>Support for updating dependencies in-place like mochideploy</li>
<li>We should use it for project templates</li>
<li>Maybe use it for migrating towards OTP releases</li>
</ul>
</div>
<div class="slide" id="developer-services-open-source">
<h1>Developer Services (open source)</h1>
<ul class="simple">
<li><strong>gitweb + cgit</strong>:
may switch to cgit-only</li>
<li><strong>Trac</strong>:
do not want</li>
<li><strong>OpenGrok</strong>:
code search</li>
<li><strong>Hudson</strong>:
continuous integration</li>
</ul>
</div>
<div class="slide" id="developer-services-internal">
<h1>Developer Services (internal)</h1>
<ul class="simple">
<li><strong>juanita</strong>:
IRC bot extraordinaire</li>
<li><strong>docportal</strong>:
Documentation (Sphinx and erldocs)</li>
</ul>
</div>
<div class="slide" id="what-we-don-t-use">
<h1>What We Don't Use</h1>
<ul class="simple">
<li><strong>OTP releases</strong>:
We probably should, for safer upgrade/downgrade</li>
<li><strong>Heartbeat</strong>:
We use daemontools instead, works better for us</li>
</ul>
</div>
<div class="slide" id="what-we-avoid">
<h1>What We Avoid</h1>
<ul class="simple">
<li><strong>Erlang RPC</strong>:
Significant downsides, we limit it to application clusters by
cookie. Use other protocols.</li>
<li><strong>Mnesia</strong>:
Bad at network partitions, but they are inevitable.
2GB limit. Headaches.</li>
</ul>
</div>
<div class="slide" id="what-we-should-use">
<h1>What We Should Use</h1>
<ul class="simple">
<li><strong>RabbitMQ</strong>:
Nice reliable communication.</li>
<li><strong>Riak</strong>:
Better partition tolerance, fewer problems than mnesia.</li>
</ul>
</div>
<div class="slide" id="node-naming">
<h1>Node Naming</h1>
<ul class="simple">
<li><strong>flavor</strong>:
localdev, dev, prod</li>
<li><strong>service_name</strong>:
<tt class="docutils literal"><span class="pre">${app_name}_${flavor}</span></tt>,
special case of <tt class="docutils literal">${app_name}</tt> for prod</li>
<li><strong>node name</strong>:
<tt class="docutils literal"><span class="pre">-name</span> <span class="pre">${service_name}\@${ip_address}</span></tt></li>
</ul>
</div>
<div class="slide" id="name-based-decisions">
<h1>Name-based Decisions</h1>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">-setcookie</span> ${hash of service_name}</tt></li>
<li><tt class="docutils literal"><span class="pre">-connect_all</span> false</tt> to force "cluster" isolation</li>
<li>app_name embedded in profiler output</li>
<li>"IDC Cluster" DNS <tt class="docutils literal"><span class="pre">${prefix}.erl.${idc}</span></tt>, e.g. <tt class="docutils literal"><span class="pre">app-dev.erl.us1.example.com</span></tt></li>
</ul>
</div>
<div class="slide" id="dns-based-tools">
<h1>DNS based tools</h1>
<ul class="simple">
<li>Tail all logs from all nodes in a cluster</li>
<li>Upgrade code on all nodes in a cluster</li>
<li>Get statistics from nodes in a cluster</li>
<li>Find all clusters in an IDC</li>
</ul>
</div>
<div class="slide" id="mochinames">
<h1>mochinames</h1>
<ul class="simple">
<li>Abstracts DNS calls, works around bugs</li>
<li>Node name, flavor, etc. code</li>
<li>Cookies</li>
</ul>
</div>
<div class="slide" id="mochidiscover3">
<h1>mochidiscover3</h1>
<ul class="simple">
<li>Adds node IP A record to IDC cluster DNS</li>
<li>Sets node cookie</li>
<li>connect_node to nodes in IDC cluster</li>
</ul>
</div>
<div class="slide" id="mochidist">
<h1>mochidist</h1>
<ul class="simple">
<li>Find nodes in an IDC cluster (siblings)</li>
<li>Variation of rpc:multicall to prevent stampede</li>
</ul>
</div>
<div class="slide" id="mochideploy">
<h1>mochideploy</h1>
<ul class="simple">
<li>Update/build/reload code to local node or IDC cluster</li>
<li>Mostly just wraps rebar and git</li>
</ul>
</div>
<div class="slide" id="multiple-idc-problems">
<h1>Multiple IDC problems</h1>
<ul class="simple">
<li>Work in progress</li>
<li>China <-> US incredibly difficult</li>
<li>Latency and packet loss is high</li>
<li>Erlang Distribution absolutely terrible for this</li>
</ul>
</div>
<div class="slide" id="multiple-idc-solution">
<h1>Multiple IDC "solution"</h1>
<ul class="simple">
<li>Separate DNS, separate "IDC clusters"</li>
<li>Using VPN + HTTP now, investigating RabbitMQ + Shovel</li>
<li>Investigating Riak EnterpriseDS replication</li>
</ul>
</div>
<div class="slide" id="mochiprofiler">
<h1>mochiprofiler</h1>
<ul class="simple">
<li>gen_server running in every app</li>
<li>Implements <tt class="docutils literal">"/stats"</tt> URL in every app</li>
<li>Tracks app counters in ETS table</li>
<li>Tracks timings in gb_tree</li>
<li>Reports on other Erlang info (mnesia, memory, etc.)</li>
</ul>
</div>
<div class="slide" id="hudson">
<h1>Hudson</h1>
<ul class="simple">
<li>Java-based continuous integration software</li>
<li>Checks out software</li>
<li>Builds, runs test and coverage suites</li>
<li>Sends email and IRC alerts of test failure</li>
<li>VERY USEFUL!</li>
</ul>
</div>
<div class="slide" id="udplog-scribe">
<h1>UDPLog + Scribe</h1>
<ul class="simple">
<li>UDPLog is our simple JSON over UDP logging protocol</li>
<li>Scribe streams and aggregates log data from UDPLog</li>
<li>OpenNMS graphs data collected by Scribe</li>
</ul>
</div>
<div class="slide" id="hardware">
<h1>Hardware</h1>
<ul class="simple">
<li>Juniper routers</li>
<li>Using A10 hardware load balancers</li>
<li>Virtual IPs forward to Erlang services</li>
<li>Servers with IPMI</li>
</ul>
</div>
<div class="slide" id="ops-platform">
<h1>Ops Platform</h1>
<ul class="simple">
<li>CentOS (Linux)</li>
<li>Puppet</li>
<li>Daemontools</li>
<li>OpenNMS</li>
</ul>
</div>
<div class="slide" id="puppet">
<h1>Puppet</h1>
<ul class="simple">
<li>Deploys OS and software to machines</li>
<li>Manages IDC configuration</li>
<li>Manages server configuration</li>
<li>Great to deploy more machines</li>
<li>Reproducible</li>
</ul>
</div>
<div class="slide" id="puppet-lifecycle">
<h1>Puppet Lifecycle</h1>
<ul class="simple">
<li>Server POST (Power-on self-test)</li>
<li>PXE boot (Preboot eXecution Environment)</li>
<li>Wait at prompt for Kickstart or OS boot (Use IPMI console to select)</li>
<li>OS boot runs Puppet every 30 min</li>
</ul>
</div>
<div class="slide" id="daemontools">
<h1>Daemontools</h1>
<ul class="simple">
<li>Switches UID/GID</li>
<li>Separate logging/supervision processes</li>
<li>Restarts services</li>
<li>Would be nice if Erlang had accessible POSIX signal support</li>
</ul>
</div>
<div class="slide" id="opennms">
<h1>OpenNMS</h1>
<ul class="simple">
<li>Java-based Network Monitoring System</li>
<li>RRD resource graphs of mochiprofiler data</li>
<li>Alerts on warnings and outages</li>
<li>Sends alerts through pages, email, IRC</li>
</ul>
</div>
<div class="slide" id="git-workflow">
<h1>Git Workflow</h1>
<ul class="simple">
<li>Work in branch based on ticket, e.g. feature-1234</li>
<li>Push branch to central repository</li>
<li>Re-assign ticket for code review and verify</li>
<li>If code passes, merge to master and deploy</li>
</ul>
</div>
<div class="slide" id="code-review">
<h1>Code Review</h1>
<ul class="simple">
<li>Currently done manually by asking in Trac</li>
<li>Reviewer responsible for generating good diffs</li>
<li>cgit is better than gitweb for this purpose</li>
<li>Looking at software to help, e.g. Rietveld or Gerrit</li>
</ul>
</div>
<div class="slide" id="future-workflow">
<h1>Future Workflow</h1>
<ul class="simple">
<li>Require tests to pass with Hudson? Integrate Dialyzer?</li>
<li>Require code review to pass with Gerrit?</li>
<li>A work in progress, we switched to Git this year</li>
</ul>
</div>
<div class="slide" id="questions">
<h1>Questions?</h1>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Twitter:</th><td class="field-body">@etrepum</td>
</tr>
<tr class="field"><th class="field-name">Blog:</th><td class="field-body"><a class="reference external" href="http://bob.pythonmac.org/">http://bob.pythonmac.org/</a></td>
</tr>
<tr class="field"><th class="field-name">Mochi US:</th><td class="field-body"><a class="reference external" href="http://en.mochimedia.com/">http://en.mochimedia.com/</a></td>
</tr>
<tr class="field"><th class="field-name">Mochi China:</th><td class="field-body"><a class="reference external" href="http://zh-cn.mochimedia.com/">http://zh-cn.mochimedia.com/</a></td>
</tr>
<tr class="field"><th class="field-name">Open Source:</th><td class="field-body"><a class="reference external" href="http://mochi.github.com/">http://mochi.github.com/</a></td>
</tr>
<tr class="field"><th class="field-name">Email:</th><td class="field-body"><a class="reference external" href="mailto:bob@mochimedia.com">bob@mochimedia.com</a></td>
</tr>
</tbody>
</table>
<p>(we're hiring!)</p>
</div>
</div>
</body>
</html>