Components to be understood in/around VMSS
- Backend Pool: Backend pool to a Loadbalancer is the vm’s or the whole VMSS which has to be load balanced
- Health Probe: Load Balancer keeps track of healhy machines in VMSS using health probes. Health Probes are of two types
- TCP Probe
- HTTP Probe
- Load Balancing Rules: Load balancing rules are use to load balance users request to load balancer
- Inbound NAT: Is used to get into the other ports of the VMSS
- YOu can login into virtual machine of the VMSS using one one of inbound nat rule
- Now login into vm using the following command
ssh -p 50000 <username>@<lbip>
# ssh -p 50000 qtdevops@40.57.87.98
- NOw lets generate artificial cpu load using stress tool
stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M -v --timeout 100m
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Using htop the artifical load on cpu inside the vm looks like
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Watch CPU Average on the VMSS Overview
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As CPU Load increase VMs inside VMSS increase
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Now navigate to http://<lbip>/info.php and refresh twice
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Now if you stop the artificial load, vmsize will fall back to minimum(1)
