title: lttng: Unable to list kernel events: Kernel tracer not available
body: <p>Currently running a CENTOS 7 machine trying to install <code>lttng-tools</code> and <code>lttng-modules</code>. </p>
  
  <p>I am going through the steps required to get lttng setup on my machine located at <a href="http://lttng.org/docs/v2.9/" rel="nofollow noreferrer">http://lttng.org/docs/v2.9/</a> and am experiencing issues with just about every step along the way. My issue right now is getting <code>lttng-modules</code> installed. I tried running the set of commands provided to install <code>lttng-modules</code>:</p>
  
  <pre><code>cd $(mktemp -d) &amp;&amp;
  wget http://lttng.org/files/lttng-modules/lttng-modules-latest2.9.tar.bz2 &amp;&amp;
  tar -xf lttng-modules-latest-2.9.tar.bz2 &amp;&amp;
  cd lttng-modules-2.9.* &amp;&amp;
  make &amp;&amp;
  sudo make modules_install &amp;&amp;
  sudo depmod -a
  </code></pre>
  
  <p>To which I received errors "<code>Can't read private key</code>" followed by INSTALL <code>/probe/path/name/probe_name.ko</code> for an entire list of probes. I read through the readme and made sure that the OS config variable dependencies were properly set. From here, I am completely unsure and any help would be appreciated. </p>
  
  <p>A snippet of the terminal output is as follows:</p>
  
  <pre><code>Can't read private key  
    INSTALL /tmp/tmp.frbWYvVaL8/lttng-modules-2.9.1/probes/lttng-probe-x86-exceptions.ko  
  Can't read private key 
    INSTALL /tmp/tmp.frbWYvVaL8/lttng-modules-2.9.1/probes/lttng-probe-x86-irq-vectors.ko  
  Can't read private key  
    INSTALL /tmp/tmp.frbWYvVaL8/lttng-modules-2.9.1/tests/lttng-clock-plugin-test.ko  
  Can't read private key   
    INSTALL /tmp/tmp.frbWYvVaL8/lttng-modules-2.9.1/tests/lttng-test.ko  
  Can't read private key  
    DEPMOD  3.10.0-327.el7.x86_64  
  make[1]: Leaving directory `/usr/src/kernels/3.10.0-327.el7.x86_64' 
  </code></pre>