删除老的Azure Blob Snapshot

客户有这样的需求：每天需要对VM的数据进行备份，但如果备份的时间超过一定的天数，需要进行清除。

本文也是在前一篇Azure Blob Snapshot上的优化。

"Azure blob Storage Snapshot"里，删除Snapshot的思路是遍历所有Storage Account，找到所有的vhd文件，看看是否有Snapshot，如果有判断是否超过14天，如果超过则删除，如果没有超过，则保留。

本文的思路是：

获取所有的虚拟机，判断虚拟机是否运行，如果运行，获取这台虚拟机上所有的硬盘。

如果硬盘的Snapshot超过我们给定的时间，删除，否则不做操作。

具体的脚本如下：

 

 1 function DeleteOlderSnapshot {
 2   [CmdletBinding()]
 3   param (
 4     [Parameter (Mandatory=$True,
 5                 ValueFromPipeLine=$True,
 6                 HelpMessage="BeforeTheDayWillBeDelete")]
 7     
 8     [String] $Day,
 9     [switch] $LogErrors
10   )
11   BEGIN{
12     Write-Verbose "Error Log will Be $ErrorLog"
13     }
14   Process
15   {
16 
17     $vms = Get-AzureVM
18     $now = Get-Date
19     foreach ($vm in $vms)
20     {
21         if($vm.Status -eq "ReadyRole")
22         {
23             $osblobname = ($vm.VM.OSVirtualHardDisk).MediaLink.ToString().Split("/")[-1]
24             $osblobcontainer = ($vm.VM.OSVirtualHardDisk).MediaLink.ToString().Split("/")[-2]
25             $osblobsa = ($vm.VM.OSVirtualHardDisk).MediaLink.ToString().Split("/")[-3].Split(".")[0]
26 
27             $storagekey = (Get-AzureStorageKey -StorageAccountName $osblobsa).Primary
28             $ctr = New-AzureStorageContext -StorageAccountName $osblobsa -StorageAccountKey $storagekey -Environment AzureChinaCloud
29         
30             $blobs = Get-AzureStorageBlob -Container $osblobcontainer -Context $ctr | Where-Object {$_.Name -match $osblobname}
31         
32             foreach ($blob in $blobs)
33             {
34                 if($blob.ICloudBlob.IsSnapshot)
35                 {
36                     
37                     $diff = [datetime]::FromBinary($now.Ticks-$blob.SnapshotTime.Ticks)
38                     write-host $blob.name  "is a snapshot"  "snapshot time is"  $diff.DayOfYear "days"
39                     if ( $diff.dayofyear -ge $Day)
40                     {
41                         
42                         write-host "delete"
43                         $blob.ICloudBlob.Delete()
44                     }
45 
46                 }else{
47                     write-host $blob.Name  "is original disk"
48                 }
49             }
50 
51             $count = $vm.VM.DataVirtualHardDisks.Count
52     
53             for($i=0;$i -lt $count;$i++)
54             {
55                 $datablobname = ($vm.VM.DataVirtualHardDisks)[$i].MediaLink.ToString().Split("/")[-1]
56                 $datablobcontainer = ($vm.VM.DataVirtualHardDisks)[$i].MediaLink.ToString().Split("/")[-2]
57                 $datablobsa = ($vm.VM.DataVirtualHardDisks)[$i].MediaLink.ToString().Split("/")[-3].Split(".")[0]
58                 $storagekey = (Get-AzureStorageKey -StorageAccountName $datablobsa).Primary
59                 $ctr = New-AzureStorageContext -StorageAccountName $datablobsa -StorageAccountKey $storagekey -Environment AzureChinaCloud
60         
61                 $blobs = Get-AzureStorageBlob -Container $datablobcontainer -Context $ctr | Where-Object {$_.Name -match $datablobname} 
62                 foreach ($blob in $blobs)
63                 {
64                     if($blob.ICloudBlob.IsSnapshot)
65                     {
66                         
67                         $diff = [datetime]::FromBinary($now.Ticks-$blob.SnapshotTime.Ticks)
68                         write-host $blob.name  "is a snapshot"  "snapshot time is"  $diff.DayOfYear "days"
69                         if ( $diff.dayofyear -ge $Day)
70                         {
71                             
72                             write-host "delete"
73                             $blob.ICloudBlob.Delete()
74                         }
75 
76                     }else{
77                         write-host $blob.Name  "is original disk"
78                     }
79                 }
80             }
81         }
82     }
83     
84   }
85   end {}
86   }
87   DeleteOlderSnapshot -Day 2