omarmciver

Simulate System Loads

https://bash-prompt.net/guides/create-system-load/

Sysadmins often need to discover how the performance of an application is affected when the system is under certain types of load. This means that an artificial load must be re-created. It is, of course, possible to install dedicated tools to do this but this option isn’t always desirable or possible.

Every Linux distribution comes with all the tools needed to create load. They are not as configurable as dedicated tools but they will always be present and you already know how to use them.

CPU
The following command will generate a CPU load by compressing a stream of random data and then sending it to /dev/null:

omarmciver

# Usage copydisk.sh <newdiskdev> <olddiskmountpoint> <temporary mountpoint>
#  e.g. copydisk.sh /dev/sdc /datadisk /tmpdatadisk
echo New disk attached is at $1
echo Existing disk mount point is at $2
echo Temporary mount point for data copy is at $3

## Add partition table
parted $1 mklabel gpt
## Create partition ext4 100% of the available space
parted $1 mkpart primary ext4 0% 100%

omarmciver

#Find the name of your disk:  
df -Th 

#Unmount the disk (in this example it's "sdc1")  
sudo umount /dev/sdc1  

#Call the interactive 'parted' command  
sudo parted /dev/sdc
   #1. Type "print" and note the size of the disk
   #2. Type "resizepart"

omarmciver

# Omar McIver
# September 16th 2021

# Subject: Open Management Infrastructure Remote Code Execution Vulnerability (CVE-2021-38647)
# Ref: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-38647

#######################
# This script will visit each of your Linux VMs and use a run-command to cat the omiserver.conf file and then grep for "port="
# This will return you the httpport=XXX and httpsport=XXX settings. If these are non-Zero then you need to get your OMI agent patched to secure against the vulnerability.
#######################

omarmciver

resources
| extend serviceEndpointCount= array_length(properties.virtualNetworkRules)
| extend vnetFilterOn=tobool(properties.isVirtualNetworkFilterEnabled)
| extend ipRangeFilter=tostring(properties.ipRangeFilter)
| project id, name, serviceEndpointCount,vnetFilterOn, ipRangeFilter, resourceGroup, subscriptionId, type
| where type == "microsoft.documentdb/databaseaccounts" and (vnetFilterOn == false or serviceEndpointCount == 0 or ipRangeFilter <> "")