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<h1 class="entry-title"><a href="/blog/2014/09/30/containerize-syslog-ng/">Containerize Syslog-ng</a></h1>
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<time class='entry-date' datetime='2014-09-30T14:22:55+08:00'><span class='date'><span class='date-month'>Sep</span> <span class='date-day'>30</span><span class='date-suffix'>th</span>, <span class='date-year'>2014</span></span> <span class='time'>2:22 pm</span></time>
| <a href="/blog/2014/09/30/containerize-syslog-ng/#disqus_thread"
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<div class="entry-content"><p>I have a pretty old LXC configuration, with <code>kernel 2.6.32</code> and <code>LXC 0.7</code>. The problem is I wasn't able to make all syslog-ng instances in both host and containers work. The syslog-ng daemon is running, however isn't writing anything to log files.</p>
<p>The culprit is the <code>/dev/log</code> UNIX socket.</p>
<p>The syslog in UNIX system is running in client/server mode:</p>
<ul>
<li>client is the <code>syslog()</code> interface in glibc. <code>syslog()</code> connects to socket <code>/dev/log</code> and send messages via the socket.</li>
<li>and server is the listener of socket <code>/dev/log</code>, such as syslog-ng, rsyslog.</li>
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<a rel="full-article" href="/blog/2014/09/30/containerize-syslog-ng/">Read on →</a>
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<h1 class="entry-title"><a href="/blog/2014/09/30/on-the-confusing-ulimit/">On the Confusing Ulimit</a></h1>
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<time class='entry-date' datetime='2014-09-30T13:01:14+08:00'><span class='date'><span class='date-month'>Sep</span> <span class='date-day'>30</span><span class='date-suffix'>th</span>, <span class='date-year'>2014</span></span> <span class='time'>1:01 pm</span></time>
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<div class="entry-content"><h2>1. ulimit and rlimit</h2>
<p>Literally, ulimit is per user resource limit, such like the total process number allowed to spawn, and the total number of file allowed to open etc. In Linux, user delegates process to apply system resource. To understand ulimit, one must get clear idea of rlimit of process.</p>
<p>The definition of rlimit:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
</pre></td><td class='code'><pre><code class='cpp'><span class='line'><span class="k">struct</span> <span class="n">rlimit</span> <span class="p">{</span>
</span><span class='line'> <span class="kt">rlim_t</span> <span class="n">rlim_cur</span><span class="p">;</span> <span class="cm">/* Soft limit */</span>
</span><span class='line'> <span class="kt">rlim_t</span> <span class="n">rlim_max</span><span class="p">;</span> <span class="cm">/* Hard limit (ceiling for rlim_cur) */</span>
</span><span class='line'><span class="p">};</span>
</span></code></pre></td></tr></table></div></figure>
<p>rlimit structure is used to describe resource limit of process (not accurate actually, will explain later). <code>rlim_cur</code> is current active limit and <code>rlim_max</code> is the ceiling value of <code>rlim_cur</code>.</p>
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