Virtual Machine Availability

# Biến môi trường
RG="rg-az104-m22"
LOCATION="southeastasia"
AS_NAME="avset-web-m22"
VNET="vnet-m22"

# Tạo Resource Group
az group create \
  --name $RG \
  --location $LOCATION \
  --tags Course=AZ-104 Module=22 Environment=Lab

# Tạo VNet
az network vnet create \
  --resource-group $RG \
  --name $VNET \
  --address-prefix 10.22.0.0/16 \
  --subnet-name subnet-web \
  --subnet-prefix 10.22.1.0/24

# Tạo Availability Set (3 Fault Domains, 5 Update Domains)
az vm availability-set create \
  --resource-group $RG \
  --name $AS_NAME \
  --platform-fault-domain-count 3 \
  --platform-update-domain-count 5 \
  --location $LOCATION

# Tạo VM 1 trong Availability Set
az vm create \
  --resource-group $RG \
  --name vm-web-m22-01 \
  --availability-set $AS_NAME \
  --image Ubuntu2204 \
  --size Standard_B2s \
  --vnet-name $VNET \
  --subnet subnet-web \
  --admin-username azureadmin \
  --generate-ssh-keys \
  --storage-sku Premium_LRS \
  --tags Course=AZ-104 Module=22 Role=WebServer

# Tạo VM 2 trong cùng Availability Set
az vm create \
  --resource-group $RG \
  --name vm-web-m22-02 \
  --availability-set $AS_NAME \
  --image Ubuntu2204 \
  --size Standard_B2s \
  --vnet-name $VNET \
  --subnet subnet-web \
  --admin-username azureadmin \
  --generate-ssh-keys \
  --storage-sku Premium_LRS \
  --tags Course=AZ-104 Module=22 Role=WebServer

# Kiểm tra fault domain và update domain assignment
az vm availability-set show \
  --resource-group $RG \
  --name $AS_NAME \
  --query "virtualMachines[].id" -o table

RG="rg-az104-m22"
LOCATION="southeastasia"
VMSS_NAME="vmss-web-m22"

# Tạo VMSS Uniform với 2 instance ban đầu
# --lb tự động tạo Standard Load Balancer
# --upgrade-policy-mode Rolling để update an toàn
az vmss create \
  --resource-group $RG \
  --name $VMSS_NAME \
  --image Ubuntu2204 \
  --vm-sku Standard_B2s \
  --instance-count 2 \
  --vnet-name vnet-m22 \
  --subnet subnet-web \
  --admin-username azureadmin \
  --generate-ssh-keys \
  --storage-sku Premium_LRS \
  --upgrade-policy-mode Rolling \
  --lb "$VMSS_NAME-lb" \
  --backend-pool-name "$VMSS_NAME-bepool" \
  --lb-sku Standard \
  --orchestration-mode Uniform \
  --location $LOCATION \
  --tags Course=AZ-104 Module=22

# Cài Nginx trên tất cả instance qua Custom Script Extension
az vmss extension set \
  --resource-group $RG \
  --vmss-name $VMSS_NAME \
  --name CustomScript \
  --publisher Microsoft.Azure.Extensions \
  --version 2.1 \
  --settings '{"commandToExecute":"apt-get update && apt-get install -y nginx && systemctl enable nginx && systemctl start nginx"}'

# Mở port 80 để test
az vmss update-instances \
  --resource-group $RG \
  --name $VMSS_NAME \
  --instance-ids "*"

# Xem Public IP của Load Balancer
az network public-ip show \
  --resource-group $RG \
  --name "${VMSS_NAME}-lb-publicip" \
  --query ipAddress -o tsv 2>/dev/null || \
az network public-ip list \
  --resource-group $RG \
  --query "[0].ipAddress" -o tsv

RG="rg-az104-m22"
VMSS_NAME="vmss-web-m22"

# Lấy Resource ID của VMSS
VMSS_ID=$(az vmss show \
  --resource-group $RG \
  --name $VMSS_NAME \
  --query id -o tsv)

# Tạo autoscale profile với metric rules
cat > /tmp/autoscale-m22.json << EOF
{
  "location": "southeastasia",
  "profiles": [
    {
      "name": "AutoScaleProfile-Web",
      "capacity": {
        "minimum": "2",
        "maximum": "8",
        "default": "2"
      },
      "rules": [
        {
          "metricTrigger": {
            "metricName": "Percentage CPU",
            "metricResourceUri": "$VMSS_ID",
            "timeGrain": "PT1M",
            "statistic": "Average",
            "timeWindow": "PT5M",
            "timeAggregation": "Average",
            "operator": "GreaterThan",
            "threshold": 70
          },
          "scaleAction": {
            "direction": "Increase",
            "type": "ChangeCount",
            "value": "2",
            "cooldown": "PT5M"
          }
        },
        {
          "metricTrigger": {
            "metricName": "Percentage CPU",
            "metricResourceUri": "$VMSS_ID",
            "timeGrain": "PT1M",
            "statistic": "Average",
            "timeWindow": "PT10M",
            "timeAggregation": "Average",
            "operator": "LessThan",
            "threshold": 30
          },
          "scaleAction": {
            "direction": "Decrease",
            "type": "ChangeCount",
            "value": "1",
            "cooldown": "PT10M"
          }
        }
      ]
    }
  ],
  "targetResourceUri": "$VMSS_ID"
}
EOF

# Áp dụng autoscale setting
az monitor autoscale create \
  --resource-group $RG \
  --resource $VMSS_ID \
  --resource-type Microsoft.Compute/virtualMachineScaleSets \
  --name "autoscale-web-m22" \
  --min-count 2 \
  --max-count 8 \
  --count 2

# Thêm scale-out rule
az monitor autoscale rule create \
  --resource-group $RG \
  --autoscale-name "autoscale-web-m22" \
  --condition "Percentage CPU > 70 avg 5m" \
  --scale out 2 \
  --cooldown 5

# Thêm scale-in rule
az monitor autoscale rule create \
  --resource-group $RG \
  --autoscale-name "autoscale-web-m22" \
  --condition "Percentage CPU < 30 avg 10m" \
  --scale in 1 \
  --cooldown 10

echo "Autoscale profile đã tạo. Kiểm tra Portal → vmss-web-m22 → Scaling"

RG="rg-az104-m22"
VMSS_NAME="vmss-web-m22"

# Xem số instance hiện tại
az vmss show \
  --resource-group $RG \
  --name $VMSS_NAME \
  --query sku.capacity -o tsv

# Manual scale lên 4 instance (bỏ qua autoscale tạm thời để test)
az vmss scale \
  --resource-group $RG \
  --name $VMSS_NAME \
  --new-capacity 4

# Đợi instance mới provision
az vmss wait \
  --resource-group $RG \
  --name $VMSS_NAME \
  --updated

# Liệt kê tất cả instance và trạng thái
az vmss list-instances \
  --resource-group $RG \
  --name $VMSS_NAME \
  --query "[].{ID:instanceId, Name:name, State:provisioningState, PowerState:powerState}" \
  -o table

# Lấy Public IP của LB và test
LB_IP=$(az network public-ip list \
  --resource-group $RG \
  --query "[?contains(name,'vmss-web-m22')].ipAddress" \
  -o tsv | head -1)

echo "Load Balancer IP: $LB_IP"
echo "Test bằng curl (mỗi request có thể tới instance khác nhau):"
for i in {1..5}; do
  curl -s --connect-timeout 5 "http://$LB_IP" | grep -o "Welcome to nginx" || echo "Request $i: timeout"
done

# Xóa toàn bộ Resource Group (kéo theo VMSS, LB, Availability Set, VNet, VM...)
az group delete --name rg-az104-m22 --yes --no-wait

echo "Resource Group rg-az104-m22 đang được xóa ở background."
echo "VMSS với 4 instance = 4x chi phí VM — luôn cleanup sau khi học!"