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Linux on Azure


Linux on Azure
Microsoft Endorsed some versions of Linux in the Azure Marketplace in which,
·         The Linux Integration Services (LIS) drivers for Hyper-V and Azure are kernel modules that are contributed directly from MS to the upstream Linux kernel.
·         The Azure Linux Agent is already pre-installed and the source code can be found on GitHub.
For Non-Endorsed Versions of Linux
  • You can bring your own Linux image by Creating and uploading a virtual hard disk that contains the Linux OS.
Endorsed distributions - Linux
Azure SLAs applies only to the Endorsed versions
  • CentOS 6.3+
  • CoreOS 494.4.0+
  • Debian 7.9+, 8.2+
  • Oracle Linux 6.4+, 7.0+
  • RHEL 6.7+, 7.1+
  • SLES 11, SLES 12+, SLES for SAP11.3+
  • Open SUSE 13.2+
  • Ubuntu 12.04, 14.04, 16.04
Accessing of Linux VMs
Once the Linux VMs are created, it is required to access the VM.
Here are the few ways to access the VMs,
  • Azure Cloud Shell (CLI)
  • Bash Shell from Windows 10
  • Putty software
To use Linux VMs using Windows OS, we need to install Bash Shell

Managing Azure Virtual Machines
Once the VM is created, the following components must be configured to provide consistency and high availability.
  • IP Addresses
  • Availability Set
  • Auto Scaling

IP address is assigned to Azure resources to communicate with other Azure resources, on-premises network, and the Internet. It can be allocated in two ways,
  • Static Allocation
  • Dynamic Allocation
Types of IP Addresses
  • Public IP addresses - Used for communication with the Internet, including Azure public-facing services.
E.g.: VMs, Internet-facing LB, VPN GW, and Application GW.
  • Private IP addresses - Used for communication within an Azure virtual network (VNet), and on-premises network when a VPN is configured.
E.g.: VMs, Internal LB, and Application GW.
Dynamic allocation is the default method for both Private and Public IP Addresses.
Public IP Allocation
Dynamic allocation method:
  • The public IP address is allocated when you start/create the associated resource (like a VM or load balancer).
  • The IP address is released when you stop/delete the resource.
In this method IP address can change.
Static allocation method:
  • The IP address must be configured in "NIC" properties for the associated resource.
  • It is released only when you delete the resource or change its allocation method to dynamic.
In this method IP address will not change.
Private IP Addresses
Private IP Addresses
·         In both (dynamic or static) ways, the IP address is allocated from the address range of the subnet to which the resource is attached.
·         In Dynamic allocation method the IP address is automatically allocated from the resource's subnet (using DHCP). This IP address can change when the resource is stopped and started.
·         In Static allocation method, the IP address must be assigned from the allocated subnet and remains the unchanged till the VM is deleted.
Availability of Azure Virtual Machines
https://technorhythms9.blogspot.com/2020/05/availability-of-azure-virtual-machines.html


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