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Microsoft Azure Networking Basics
An Azure virtual network (VNet) provides connectivity and security for virtual machines and allows access to the public internet and other VMs. Network security groups contain rules that allow or deny network traffic, and Azure load balancers distribute incoming internet traffic across VMs. Availability sets distribute VMs across update and fault domains for redundancy and high availability. Virtual network gateways connect Azure VNets and on-premises networks, while Traffic Manager controls traffic distribution across endpoints in different datacenters.
In this document
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An overview of Azure Networking, introducing the presentation by Sai Kishore.
Describes Azure Virtual Networks (VNet), emphasizing connectivity, security, and IP addressing.
Explains Network Security Groups (NSG) that manage traffic rules for VM instances, ensuring secure access.
Details Azure Load Balancer's role in optimizing traffic, providing high availability and performance for applications.
Discusses the importance of availability sets for VMs, including planned/unplanned maintenance and best practices.
Provides insights into fault and update domains for VMs, crucial for ensuring high availability in Azure.
Covers the use of Virtual Network Gateways for traffic management between Azure networks and on-premises.
Explains the Azure Traffic Manager's functionality in traffic distribution across different data centers.
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Microsoft Azure Networking Basics
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- 2. WHAT ISVIRTUAL NETWORKIN AZURE? An Azure virtual network (VNet) is a representation of your own network in the cloud. Connectivity. Access to the public Internet. Access toVMs. Security. AzureVirtual Network Contains Ipaddress - Public and Private. Subnet - Subnet is a range of IP addresses in theVnet.
- 3. NETWORK SECURITY GROUP Networksecurity group (NSG) contains a list of Access Control List (ACL) rules that allow or deny network traffic to yourVM instances in aVirtual Network. NSGs can be associated with either subnets or individualVM instances within that subnet. Reference Link - https://azure.microsoft.com/en-in/documentation/articles/virtual-networks-create-nsg-arm- pportal/?cdn=disable
- 4. AZURE LOAD BALANCER Virtualmachines and cloud services in aVirtual network can be exposed to Internet using Azure Load balancers. You can use an load balancer to provide high availability and network performance to your applications. Load balance incoming Internet traffic to virtual machines. Load balance traffic between virtual machines in a virtual network, between virtual machines in cloud services, or between on-premises computers Forward external traffic to a specific virtual machine. Azure Load Balancer uses a hash-based distribution algorithm Reference Link - https://azure.microsoft.com/en- in/documentation/articles/load-balancer-overview/
- 5. AVAILABILITY SETS - MicrosoftAzureplatform events that can affect the availability of your virtual machines: planned maintenance and unplanned maintenance. Planned maintenance events are periodic updates made by Microsoft to the underlying Azure platform to improve overall reliability, performance, and security of the platform infrastructure. Unplanned maintenance events occur when the hardware or physical infrastructure underlying your virtual machine has faulted in some way.This may include local network failures, local disk failures, or other rack level failures. When such a failure is detected, the Azure platform will automatically migrate your virtual machine from the unhealthy physical machine hosting your virtual machine to a healthy physical machine. Follow best practices when you design your application for high availability To reduce the impact of downtime due to one or more of these events, we recommend the following high availability best practices for your virtual machines: Configure multiple virtual machines in an availability set for redundancy , even for applications Combine the Load Balancer with availability sets.
- 6. UPDATE AND FAULTDOMAINS - Fault Domain (FD) – A fault domain is a grouping of hardware (rack of resources like servers, power etc.) in whichVirtual Machines are arranged. By default, the virtual machines configured within your availability set are separated across up to 3 fault domains for resource manager deployments. Update Domain (UD) – An update Domain on the other hand is an arrangement within the Racks so as to provide the Web or worker role instances with high availability by ensuring that only one of Instances of the roles will be down for update at one time. For a given availability set, 5 update domains are assigned by default. Each virtual machine in your availability set is assigned an update domain and a fault domain by the underlyingAzure platform.
- 7. VIRTUAL NETWORK GATEWAY A virtual network gateway is used to send network traffic between Azure virtual networks and on-premises locations and also between virtual networks within Azure (VNet-to-VNet). VPN and Express Route VPN – Site to Site, Point to Site &Vnet toVnet Connectivity. Basic, Standard & High Performance Reference Link - https://azure.microsoft.com/en- in/documentation/articles/vpn-gateway-about-vpngateways/
- 8. TRAFFIC MANAGER INAZURE Microsoft AzureTraffic Manager allows you to control the distribution of user traffic for service endpoints in different datacenters. Service endpoints supported byTraffic Manager include AzureVMs,Web Apps, and cloud services. Traffic Manager uses the Domain Name System (DNS) Traffic Manager benefits Improve availability of critical applications Improve responsiveness for high-performance applications Perform service maintenance without downtime Combine on-premises and Cloud-based applications