AZURE202x Microsoft Azure Virtual Machines - Module 3

https://openedx.microsoft.com 에서 제공하는 무료 강좌인 Microsoft Azure Virtual Machines 의 모듈 3 부분에 대한 정리입니다.

Public IP Address

• For public-facing services
• VMs, Internet facing load balancers, VPN gateways and application gateways
• Can configure on the public IP resource
• dynamic address
  • IP is not allocated on its creation, but assigned on starting and released on stopping
• static address
  • IP is assigned on its creation, and released on deletion or on changing to dynamic

Private IP Address

• Within Azure VNet
• To extend on-prem with VPN Gateway or ExpressRoute
• VMs, internal load balancers and application gateways
• Can configure on the network interface resource
• We can't choose a specific IP address
• dynamic address
  • default method assigned by resource's subnet via DHCP. Changes when start/stop the resource.
• static address
  • can set static with a valid IP within the resource's subnet.

Availability Set

• Logical grouping of 2+ VMs to prepare planned/unplanned failures
• Availability Set Principles
  • Multiple VMs in one Availability Set for redundancy
  • Each application tier into separate Avaliability Sets
  • Load Balancer with Availability Sets combination
• Each VM in one Availability Set is placed in one update domain and two fault domains

Update Domains

• To perform incremental or rolling updates during the deployment
• Set of VMs with physical hardware that can be updated/rebooted at the same time
• Only one update domain is rebooted at a time.
• 5 UD by default, but up to 20 UDs

Fault Domains

• To share a common set of hardware, switches for single point of failures
• VMs in AS are placed in at least two FDs to avoid affects from hardware failures, network outages, power interruptions or software updates

Scale Set

• Azure Compute resource to deploy/manage a set of identical VMs
• Support true auto-scale without provisioning to build large-scale targeting big compute, big data, centralised workloads
• Often integrated with Azure Insight to measure scale up/down, Load Balancer, and NAT rules to spread workload over the available VMs
• Guidelines
  • Automatically created with load balancer NAT rules to enable SSH or RDP
  • Scale Set varies between 0 and 100 VMs and easily change the number of VMs
  • Set Max/Min number of VMs and define triggers based on resource consumption
  • On scaling out, VMs are balanced across update/fault domains for maximum availability
  • On scaling in, VMs are removed with maximum availability