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[筆記] UBUNTU 16.04 Google Compute Engine 自動自我備份

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以下步驟將教學利用Google Compute Engine 自我定期備份(Backup automatically)：

 1. 安裝 Google Cloud ( 如果用外部機器才需要裝，如果使用Google Compute Engine內建已安裝)

# Create an environment variable for the correct distribution
export CLOUD_SDK_REPO="cloud-sdk-$(lsb_release -c -s)"

# Add the Cloud SDK distribution URI as a package source
echo "deb http://packages.cloud.google.com/apt $CLOUD_SDK_REPO main" | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list

# Import the Google Cloud Platform public key
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

# Update the package list and install the Cloud SDK
sudo apt-get update && sudo apt-get install google-cloud-sdk

 2. 開啟該Instance的Cloud Engine API權限

# 如果還沒開機器可以再開機器的時候設定，已經開了就要停止機器用「編輯」做設定，須將Compute Engine的權限開啟為「讀寫」

停用Instance後可進行編輯，選取存取範圍為針對各個API設定存取權

找到Compute Engine開啟讀寫，其餘不需更動


3. 撰寫Script sh檔自動建立Snapshot並刪除昨日的Snapshot

# 新增一個執行檔
cd /home
sudo vim backup.sh

# 內容如下：主要是將昨日日期與今日日期標記在snapshot名稱
yesterday="$(date -d yesterday '+%Y%m%d')"
nowDate=$(date +%Y%m%d)
sudo gcloud compute disks snapshot [GOOGLE CLOUD ENGINE DISK NAME] --snapshot-names=backup-$nowDate --zone=asia-east1-a
gcloud compute snapshots delete backup-$yesterday

# 將執行檔轉為可執行
sudo chmod +x backup.sh

4. 將sh設定到Crontab中
sudo vim /etc/crontab

# 內容如下：看是要什麼時候執行該備份，以下為定期每日凌晨一點執行
0 1  * * * root /home/backup.sh


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