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How to Secure Azure Linux VMs Using SSH Keys and Network Security Groups

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A technical guide published on DEV Community outlines steps to harden Azure Linux virtual machines against unauthorized access. The process begins with generating a 4096-bit RSA SSH key pair locally and deploying an Ubuntu 22.04 LTS VM on Azure using the public key for authentication. To restrict exposure, a Network Security Group rule is configured to allow SSH access on port 22 only from the user's specific public IP address, blocking all other sources. The guide confirms the setup works by showing that SSH connections from different IP addresses time out, validating the NSG rule is enforcing traffic restrictions. Users are also advised to delete the resource group after testing to avoid unexpected Azure billing charges.

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How to Secure Azure Linux VMs Using SSH Keys and Network Security Groups · ShortSingh