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writing your first pixie pxl script

Pixie is an amazing tool used for monitoring Kubernetes clusters. It allows you to easily visualize different metrics about your cluster, all available from the easy-to-use Pixie Live UI. You might have noticed that different types of monitoring data from Pixie is retrieved using different scripts (located in the top left corner of the Live UI). The scripts included with Pixie are powerful, and allow access to multiple metrics, all presented in coherent visualizations. However, did you know that you can access the same information in tabular format, which you can manipulate to your benefit? These are known as PXL scripts and are used to communicate with Pixie. Let’s dig in to creating and testing your first custom PXL script.

What Is A PXL Script?

PXL scripts are used to get/manipulate the telemetry data gathered by Pixie. You can also use PXL scripts to collect data from new sources. They are written in a custom language developed by Pixie called PXL. PXL is similar to Python, in its syntax, and its use of dataframes (used by many pythonistas in the pandas library for data manipulation). These scripts can be executed by the Live UI, CLI, or even API. In our case, to keep this tutorial short and easy, let’s focus on executing PXL scripts on the Live UI.

Writing Your First PXL Script

All PXL scripts are text files which end in the file extension .pxl. So, let’s get started by creating a file: my_first_script.pxl. Within this file, paste the code below. I’ve added comments so you can follow along and understand what each line of the code does.

# We import px, which is the library we will be using to add extra data to our table.
import px
# We gather data from the last 5 minutes, from the `process_stats` table, and create a dataframe from it.
df = px.DataFrame(table='process_stats', start_time='-5m')
# Below, we are adding extra data to our table, using `context` or `execution_time_functions`
df.pod_id = df.ctx['pod_id']
df.pod_name = px.upid_to_pod_name(df['upid'])
df.pod_id = px.pod_name_to_pod_id(df['pod_name'])
df.cmd = df.ctx['cmdline']
df.pid = df.ctx['pid']
df.container_name = df.ctx['container_name']
df.container_id = df.ctx['container_id']
# We group the dataframe based on certain attributes, and aggregate the data.
df = df.groupby(['pid', 'cmd', 'upid', 'container_name']).agg()
# We display the dataframe.
px.display(df, 'processes_table')

Summary: This script will get the data from Pixie’s process_stats table from the past 5 minutes. The script will also add other context that is missing from the original table. Lastly, the script will group the data based on certain columns, and aggregate the data.

Note: The px.display() function is required for the script to be able to run.

Testing Your First PXL Script

In order to test your PXL script, you can open up the Pixie LIVE UI, navigate to the top left corner, and click on the script button. Then, scroll up to the top where you will see the Scratch Pad option. This will allow you to paste your script into the editor that has opened up on the right-hand side. After pasting your script, you can hit the Run button in the top right corner to execute the script. You will then see the results table displayed in your Live UI.

Common Functions To Manipulate/Add To Your Data

Pixie includes in-built execution-time functions that you can use to modify and/or manipulate your data. These can be viewed at the link here . Below, I have compiled a list of some of the most useful ones that I have encountered/used:

  • px.upid_to_*(): Anything that starts with a upid_to_ is a great function, as it allows you to dervive context from the cluster you are working with. For example, px.upid_to_namespace() will get you the namespace that the current data is working under. This function is extremely useful, as every table you will be deriving data from (sans the network_stats table) contains a upid.
  • px.time_to_int64(): Converts time to an Int64 value. Very useful for post-processing of time.
  • px.vizier_name(): Gets the name/id of the cluster.
  • px.atoi(): Converts a string value to an integer.

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