# Compute Engine的主機類型選擇

Google Compute Engine提供許多主機類型可以選擇，主要以三大類為主：

* Standard主機：Standard類型主機主要以1 Core CPU搭配3.75G記憶體的方式倍增，提供基本的主機運算資源選擇。
* High CPU主機：High CPU主機主要將Standard類型之主機CPU倍增，讓需要較高CPU資源之服務可以直接選用。
* High Memory主機：High Memory主機主要將Standard類型之主機Memory倍增，讓需要較高Memory資源之服務可以直接選用。

註：以上，不論是哪種類型的主機，基本上在同一資料中心的硬體規格均是相同，僅是CPU與記憶體數量的差別。

## 查詢主機型號

如果想要知道目前GCP上提供哪些型號的主機服務，可以透過gcloud指令作查詢：

```
$ gcloud compute machine-types list
NAME            ZONE               CPUS  MEMORY_GB  DEPRECATED
f1-micro        asia-east1-c       1     0.60
g1-small        asia-east1-c       1     1.70
n1-highcpu-16   asia-east1-c       16    14.40
n1-highcpu-2    asia-east1-c       2     1.80
n1-highcpu-32   asia-east1-c       32    28.80
n1-highcpu-4    asia-east1-c       4     3.60
n1-highcpu-8    asia-east1-c       8     7.20
n1-highmem-16   asia-east1-c       16    104.00
n1-highmem-2    asia-east1-c       2     13.00
n1-highmem-32   asia-east1-c       32    208.00
n1-highmem-4    asia-east1-c       4     26.00
n1-highmem-8    asia-east1-c       8     52.00
...(skip)
```

查詢的結果將會完整的顯示型號與該型號對應的CPU與記憶體數量，供您挑選一個適合您的機型。

## 彈性主機規格

GCP除了提供標準類型機器之外，另外也提供彈性的主機規格供使用者自行設定CPU與希望搭配的記憶體大小....

![Custom Machine Type](/files/-LAi6voHBWDeJBnMYPgv)

彈性的主機類型選擇，在考慮服務資源調整時候，可以更節省資源的成本，達到節費的效果喔！


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