Archive | Linux

Send data to OMS Log Analytics with Curl from a Linux server

Here is an example how to send data to OMS Log Analytics with Curl from a Linux server. I have created a bash script that creates everything that is needed for Curl to send data to OMS Log Analytics. Just add your Workspace ID and Workspace Key and try it out. Hope it is useful for you!

Save the following script, make the changes necessary and then run it.

The first time you run the script OMS Log Analytics will create Custom Fields for you based on your data input.

Send data to OMS Log Analytics with Curl from a Linux server1

After some time, you will see the first data from your script. As for now, the data record will not be complete from the beginning. But after some time, the data record  will be updated and all information will be shown. When you see the full data record, all the following record will have all information from the beginning without any delay.

Send data to OMS Log Analytics with Curl from a Linux server2

To get more information, please have a look at Microsoft documentation – https://docs.microsoft.com/en-us/azure/log-analytics/log-analytics-data-collector-api

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DSC for Linux example – application installation and configuration with bash script

In the following example I will show how to install the “ocsinventory-agent” package on an Ubuntu server and then pull the Inventory on the server to a file in a created directory “/var/log/ocsinventory”. This will be done by a bash script. The DSC configuration works fine but is still under testing so please give me feedback if something could be done in another way. It is tested with Azure Automation DSC as a pull server.

DSC Configuration file

Just copy and pasted the script to a PowerShell file (ps1).

 

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Install Desired State Configuration on Linux system and connect it to Azure Automation

I received a question if it is possible to only install DSC for Linux servers without installing OMS agent as I do in my post Easy installation and registration script for OMS and DSC on Linux.

To install PowerShell DSC manually it is just to download the Open Management Infrastructure (OMI) agent from https://collaboration.opengroup.org/omi, and then PowerShell DSC from https://github.com/Microsoft/PowerShell-DSC-for-Linux.

But what if you want to install the components by a script? On the web there is a couple of ways to do this and this is my way. In my script I will download the OMS agent and then use the OMI package in there to install OMI that is needed for DSC on Linux. This is because there is no way to download the OMI package from OpenGroup with wget.

The script is using dpkg as installer and is tested on Debian and Ubuntu. To use it on systems that support rpm packages, change the dpkg and .deb files.

 

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Add module in Azure Automation if DSC Configuration compilation fails

If you get the following error, see below, when compiling DSC Configuration in Azure Automation, it is probably because the module for the DSC Configuration is missing. In my example I need the “nx” module to compile the DSC configuration file. To solve the problem, add the module to the Azure Automation account.

Add module in Azure Automation if DSC Configuration compilation fails 1

Exception calling “NewScriptBlock” with “1” argument(s): “At line:4 char:5 + Import-DSCResource -Module nx + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The DSC engine could not load the module ‘nx’. It was not found on the system. At line:8 char:9 + nxPackage apache2Install + ~~~~~~~~~ Undefined DSC resource ‘nxPackage’. Use Import-DSCResource to import the resource. At line:15 char:9 + nxService apache2Service + ~~~~~~~~~ Undefined DSC resource ‘nxService’. Use Import-DSCResource to import the resource. At line:23 char:9 + nxFile apache2File + ~~~~~~ Undefined DSC resource ‘nxFile’. Use Import-DSCResource to import the resource.” (At line:4 char:5 + Import-DSCResource -Module nx + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The DSC engine could not load the module ‘nx’. It was not found on the system. At line:8 char:9 + nxPackage apache2Install + ~~~~~~~~~ Undefined DSC resource ‘nxPackage’. Use Import-DSCResource to import the resource. At line:15 char:9 + nxService apache2Service + ~~~~~~~~~ Undefined DSC resource ‘nxService’. Use Import-DSCResource to import the resource. At line:23 char:9 + nxFile apache2File + ~~~~~~ Undefined DSC resource ‘nxFile’. Use Import-DSCResource to import the resource.)

Add Module

Open the Azure Automation account and click Asset and then Modules.

Add module in Azure Automation if DSC Configuration compilation fails2

If you have a module package you can upload it to Azure Automation by clicking “Add a module” if it exists in the Gallery, you can download and install it from there. In my example I will click “Browse Gallery” and install it from there.

Add module in Azure Automation if DSC Configuration compilation fails3

Search for the module to install. In my example “nx”.

Add module in Azure Automation if DSC Configuration compilation fails4

Click the module to install and then “Import”.

Add module in Azure Automation if DSC Configuration compilation fails5

Now the module should be installed into the Azure Automation account and be ready to use.

Add module in Azure Automation if DSC Configuration compilation fails6

Try to compile the DSC Configuration file again to see if it works!

 

 

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