前不久，Kubernetes社区刚刚官宣了其1.12版本正式GA，其中强调的两点功能更新之一 “Support for Azure Virtual Machine Scale Sets (VMSS) and Cluster-Autoscaler is Now Stable” ，意味着通过Azure中的VMSS，大家可以更为快速、灵活的去动态调整 Kubernetes 集群大小，今天在这里，以ACS-Engine为例，跟大家聊聊如何快速部署出支持VMSS的Kubernetes集群。
# 部署支持 VMSS 的ACS-Engine集群
部署支持 VMSS 的ACS-Engine集群很简单，所使用的ACS-Engine模板请参照：
```
{
"apiVersion": "vlabs",
"location": "chinaeast2",
"properties": {
"orchestratorProfile": {
"orchestratorType": "Kubernetes",
"orchestratorRelease": "1.12",
"kubernetesConfig": {
"addons": [
{
"name": "cluster-autoscaler",
"enabled": true,
"config": {
"minNodes": "1",
"maxNodes": "5"
}
}
]
}
},
"masterProfile": {
"count": 1,
"dnsPrefix": "zjacsenginedemo01",
"vmSize": "Standard_D2_v2"
},
"agentPoolProfiles": [
{
"name": "agentpool01",
"count": 1,
"vmSize": "Standard_D2_v2",
"availabilityProfile": "VirtualMachineScaleSets"
}
],
"linuxProfile": {
"adminUsername": "azureuser",
"ssh": {
"publicKeys": [
{
"keyData": "$your_private_key"
}
]
}
},
"servicePrincipalProfile": {
"clientId": "$your_sp_id",
"secret": "$your_sp_password"
}
}
}
```
接下来，按照官方步骤部署集群，请参照：
https://github.com/Azure/acs-engine/blob/master/docs/kubernetes/deploy.md#acs-engine-the-long-way
部署完成后，可以看到资源组中的构成如下：
