Azure Instance Metadata Service and jq
- The jq Refer Here is a light weight json parser.
- Example queries
curl -H Metadata:true --noproxy "*" "http://169.254.169.254/metadata/instance?api-version=2020-09-01" | jq '.| { os: .compute.osType}'
curl -H Metadata:true --noproxy "*" "http://169.254.169.254/metadata/instance?api-version=2020-09-01" | jq '.| { os: .compute.osType, distribution: .compute.offer}'
curl -H Metadata:true --noproxy "*" "http://169.254.169.254/metadata/instance?api-version=2020-09-01" | jq '.| { os: .compute.osType, distribution: .compute.offer, publicip: .network.interface[0].ipv4.ipAddress[].publicIpAddress}'
- Now lets try to write a script which uses IMDS
- This sample script runs on start up of the Linux VM and updates the packages
#!/bin/bash
offer=$(curl -H Metadata:true --noproxy "*" "http://169.254.169.254/metadata/instance/compute/offer?api-version=2020-09-01&format=text")
echo $offer
if [[ $offer == "UbuntuServer" ]]; then
sudo apt update
elif [[ $offer == "Centos" ]]; then
sudo yum update -y
else
echo "The current distribution $offer is not supported"
fi
Azure CLI
- Ensure Azure CLI is installed on the machine
- Now connect to Azure
az login
# once the login is success
az group list
- Azure CLI is a command line utility which can be used to perform operations on Azure
- Azure CLI commands will be in the following structure
az <service> [<sub section>] <action> --parameter1 <value1> ... --parametern <valuen>
- Finding azure cli commands is very simple
- Exercise:
- Create a resource group in Azure using portal
- Now lets see how to do the same stuff using azure cli. Navigate to Refer Here
- Create a resource group in Azure using portal
- Output formats for the cli commands Refer Here
- Lets try to use azure cli to search for VM images
- In Azure Any VM Image has the following relation b/w publisher, offer and sku
- Exercise: Explore different windows servers and centos server images available in Azure
