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Python DTrace consumer meets the web

March 29th, 2012 • Comments Off on Python DTrace consumer meets the web

I had look at my Python DTrace consumer yesterday night and realized it need a bit an overhaul. I already demoed that you can make some visualization with it – like life updating callgraphs etc. Still it missed some basic functionality. For example I did only support some DTrace aggregation actions like sum, min, max and count. Now I added support for avg, quantize and lquantize.

Now I just needed to write about 50 LOC to do something nice πŸ™‚ Those ~50 lines are the implementation of an WSGI app using Mako as a template engine. Embedded in the Mako templates are Google Charts. And those charts actually show information coming out of the Python consumer. Now all what is left, is to point my browser to my SmartOS machine and get up-to-date graphs! For example a piechart which shows system calls by process:

Python DTrace consumer

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Or using quantize I can browse a nice read size distribution – aka: how much bytes do my processes usual read?:

Python based DTrace consumer

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With all this it is also possible to plot graphs on the latency of node.js apps :-):

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Again documentation on writing DTrace consumers is almost non-existent. But with some ‘inspiration’ from Bryan Cantrill and the original C based consumer I was able to get it work.

Python DTrace consumer on SmartOS

March 23rd, 2012 • Comments Off on Python DTrace consumer on SmartOS

As mentioned in previous blog posts (1 2 3) I wrote a Python DTrace consumer a while ago. The cool thing is that you can now trace Python (as provider) and consumer the ‘aggregate’ in Python (as consumer) as well :-). Some screen-shots and suggestions what you can do with it are described on the github page.

I did not have much spare time lately but I got the a chance last night to test my Python based DTrace consumer on SmartOS, Solaris 11 and OpenIndiana – and can confirm that it runs on all 3.

To get it up and running on SmartOS you will first need to install some dependencies. Use the 3rd party repositories as described in the SmartOS wiki to get pkg up and running:

pkg install git gcc-44 setuptools-26 gnu-binutils

When that is done we will clone the consumer code and install cython (you could however also use ctypes) using pip:

easy_install pip
pip install cython
git clone git://github.com/tmetsch/python-dtrace.git
cd python-dtrace/
python setup.py install

Now since this is done we can do the obligatory ‘Hello World’ to get things going:

Python DTrace consumer on SmartOS (Click to enlarge)

For more examples refer to the examples folder within the python-dtrace repository.

SmartStack = SmartOS + OpenStack (Part 3)

February 28th, 2012 • Comments Off on SmartStack = SmartOS + OpenStack (Part 3)

This is the third part os the blog post series. Previous parts can be found here: 1 2

To ensure the proper startup of nova-compute we will register it using SMF – this will also increase the dependability of the services. To start we will define a properties file for nova-compute – we will be using a glance and rabbitMQ host which run on a different host:

--connection_type=fake
--glance_api_servers=192.168.56.101:9292
--rabbit_host=192.168.56.101
--rabbit_password=foobar
--sql_connection=mysql://root:foobar@192.168.56.101/nova

We will store this contents in the file /data/workspace/smartos.cfg. We will also create an XML file with the manifest definition – it has some dependencies defined:

<?xml version='1.0'?>
<!DOCTYPE service_bundle SYSTEM '/usr/share/lib/xml/dtd/service_bundle.dtd.1'>
<service_bundle type='manifest' name='openstack'>
  <service name='openstack/nova/compute' type='service' version='0'>
    <create_default_instance enabled='true'/>
    <single_instance/>
    <dependency name='fs' grouping='require_all' restart_on='none' type='service'>
      <service_fmri value='svc:/system/filesystem/local'/>
    </dependency>
    <dependency name='net' grouping='require_all' restart_on='none' type='service'>
      <service_fmri value='svc:/network/physical:default'/>
    </dependency>
    <dependency name='zones' grouping='require_all' restart_on='none' type='service'>
      <service_fmri value='svc:/system/zones:default'/>
    </dependency>
    <exec_method name='start' type='method' exec='/usr/bin/nohup /data/workspace/nova/bin/nova-compute --flagfile=/data/workspace/smartos.cfg &amp;' timeout_seconds='60'>
      <method_context>
        <method_environment>
          <envvar name="PATH" value="/ec/bin/:$PATH"/>
        </method_environment>
      </method_context>
    </exec_method>
    <exec_method name='stop' type='method' exec=':kill' timeout_seconds='60'>
      <method_context/>
    </exec_method>
   <stability value='Unstable' />
  </service>
</service_bundle>

This can be imported using the svccfg command. After doing so we can use al the known commands to verify all is up and running:

[root@08-00-27-e3-a9-19 /data/workspace]# svcs -p openstack/nova/compute
STATE          STIME    FMRI
online         14:04:52 svc:/openstack/nova/compute:default
               14:04:51     3142 python

Now up to integrate vmadm…

SmartStack = SmartOS + OpenStack (Part 2)

February 15th, 2012 • 2 Comments

This is the second post in this series. Part 1 can be found here.

After setting up nova on SmartOS you should be able to launch the nova-compute service – Andy actually managed to get the nova-compute instance up and running:

./bin/nova-compute --connection_type=fake --sql_connection=mysql://root:admin@192.168.0.189/nova --fake_rabbit
2012-02-15 10:26:32,205 WARNING nova.virt.libvirt.firewall [-] Libvirt module could not be loaded. NWFilterFirewall will not work correctly.
2012-02-15 10:26:32,374 AUDIT nova.service [-] Starting compute node (version 2012.1-LOCALBRANCH:LOCALREVISION)
2012-02-15 10:26:33,099 INFO nova.rpc [-] Connected to AMQP server on localhost:5672

Note that for now we will use a fake RabbitMQ connection. The connection to the MySQL server however is mandatory.

This is the first step in plan to get OpenStack running on SmartOS. Next step will be to look into integration vmadm as a driver in OpenStack. The overall Ideas we have can be found in this slideset on google docs.

SmartStack = SmartOS + OpenStack (Part 1)

February 12th, 2012 • 4 Comments

[Update] – The first shot didn’t work – so I updated this post!

This is the first post of hopefully a series of post about getting OpenStack up and running on SmartOS. There is a blueprint for this effort. For this first post we will focus on setting up SmartOS and try to get some needed packages up and running.

I used the the following SmartOS iso image which will you – when booted – guide you through a small setup routine: smartos-20120210T043623Z.iso. After this you need to configure the pkg repositories as described in this tutorial. I encourage you all to have two discs attached – One for the zones – and one for the data. So since the setup routine created the zones pool I will first create a data pool on the second disc:

zpool create data c0t2d0
zfs create data/ec
zfs set mountpoint=/ec data/ec
zfs mount data/ec
cd / && wget -O- -q http://svn.everycity.co.uk/public/solaris/misc/ \
                    pkg5-smartos-bootstrap-20111221.tar.gz | gtar -zxf-

One major dependency is python, gcc and some tools and libs – and we will also need git so we can get the source code of nova later on:

/ec/bin/pkg install pkg:/database/mysql-55/client@5.5.16-0.162 \
                    pkg:/library/python/mysqldb@1.2.3-0.162
/ec/bin/pkg install python26 git setuptools-26 gcc-44 libxslt gnu-binutils

Next step will be to create a workspace file-system using ZFS (Optional) – this will allow me to do rollbacks later on during the porting of OpenStack:

zfs create data/workspace
cd /data/workspace/

Let’s clone nova and install pip:

export PATH=/ec/bin:$PATH
easy_install pip
git clone git://github.com/tmetsch/nova.git
cd nova/tools
export CFLAGS="-D_XPG6 -std=c99"
pip install -r pip-requires

Now let’s see if we can get the test up and running:

cd ..
./run_tests.sh

This will do for the first steps – I’ll be going to get the dependencies of nova up and running next – Will than post the next blog post.

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