[英]Change TTL for subdomain records in Windows Server DNS with PowerShell
我正在嘗試使用 PowerShell 在 Windows 服務器 DNS 中批量編輯 DNS TTL。我真正無法理解的是我從Get-DnsServerResourceRecord
獲得的記錄對象中沒有任何 FQDN。
我的 DNS 設置有一個主區域和許多子域。
primaryzone.tld
├── sub1
│ ├── record1
│ ├── record2
│ └── subsub1
│ ├── (same as parent)
│ ├── record1.1
│ └── record2.1
├── sub2
└── sub3
由於無法使用Get-DnsServerResourceRecord
進行遞歸,我必須遍歷無法以編程方式收集的子域,以獲取所有記錄,而不僅僅是區域根級別的記錄:
$DNSServer = "dc.company.tld"
$Zone = "primaryzone.tld"
$ChildZone = "sub1"
$SubDomains = @("","subsub1")
ForEach ($SubDomain in $SubDomains){
if ( $SubDomain -ne "" ) {
$FullDomain = "$($SubDomain).$($ChildZone)"
}
else {
$FullDomain = $ChildZone
}
Get-DnsServerResourceRecord -ComputerName $DNSServer -ZoneName $Zone -Name "$($FullDomain)"
這真的應該是那樣嗎?
如果我現在想更改subsub1
下所有記錄的 TTL,我會這樣嘗試:
Get-DnsServerResourceRecord -ComputerName $DNSServer -ZoneName $Zone -Name "$($FullDomain)" |
ForEach-Object{
$newRecord = $_.Clone()
$newRecord.TimeToLive = $ttl
Set-DnsServerResourceRecord -ComputerName $DNSServer -NewInputObject $newRecord -OldInputObject $_ -ZoneName $Zone
}
它適用於subsub1 (same as parent)
記錄,它具有primaryzone.tld
的HostName
屬性,因此在subsub1.sub1
中提供完整路徑。 而record1.1
的HostName
名是record1.1
,它在樹中剝離了有關其 position 的任何信息。 這會導致此錯誤:
Set-DnsServerResourceRecord : Resource record in OldInputObject not found in primaryzone.tld zone on dc.company.tld server.
At C:\Users\me\Desktop\dns_ttl.ps1:24 char:13
+ Set-DnsServerResourceRecord -ComputerName $DNSServer -NewInputObject ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (dc.company.tld:root/Microsoft/...rResourceRecord) [Set-DnsServerResourceRecord], CimException
+ FullyQualifiedErrorId : WIN32 9714,Set-DnsServerResourceRecord
我將此解釋為Set-DnsServerResourceRecord
未找到OldInputObject
記錄,因為它不知道在哪里查找,除了區域的根級別。
為什么我可以為Get-DnsServerResourceRecord
指定-Name subdomain
,但在使用Set-DnsServerResourceRecord
將其寫回時它不采用-Name
參數? 為什么不記錄對象在區域中不包含有關其絕對 (FQDN) position 的任何信息?
這么簡單的事情怎么會這么難呢?
編輯:
我根據@Cpt.Whale 的建議更改了我的腳本
$DNSServer = "dc.company.tld"
$TargetZone = "primary.tld"
$TTL = [System.TimeSpan]::FromMinutes(1)
$SubDomain = "sub.primary.tld"
$Zones = Get-DnsServerZone -ComputerName $DNSServer | Where {
$_.ZoneType -eq 'Primary' -and
$_.IsReverseLookupZone -eq $false -and
$_.ZoneName -ne 'TrustAnchors' -and
$_.ZoneName -eq $TargetZone
}
Foreach ($DnsZone in $Zones) {
# Get all records in zone by not specifying -Name:
$Records = $DnsZone | Get-DnsServerResourceRecord -ComputerName $DNSServer
$Records | Foreach {
if ($_.HostName -match "$SubDomain$") {
if ($_.TimeToLive -ne $TTL) {
# This weird copy is due to awkward CIM references
$oldRecord = $_
$newRecord = $_.Clone()
$newRecord.TimeToLive = $TTL
# Update the TTL on the existing record:
Set-DnsServerResourceRecord -ComputerName $DNSServer -Old $oldRecord -New $newRecord -ZoneName $DnsZone.ZoneName
# Report changes
"{0,-50} TTL changed from {1,12} to {2,12}" -f $_.HostName, $_.TimeToLive, $TTL
}
}
}
}
有了這個我得到了完整的HostName
,但仍然是我上面描述的錯誤
DNS 記錄類型 cim object 沒有ZoneName
屬性,但它確實保留了子域 - 它是記錄的HostName
名的一部分。 DNS 幾乎不關心子域,除非它們是一個單獨的區域。
首先要仔細檢查您是否實際上只有一個區域:
$zones = Get-DnsServerZone -ComputerName $DNSServer | Where {
$_.ZoneType -eq 'Primary' -and
$_.IsReverseLookupZone -eq $false -and
$_.ZoneName -ne 'TrustAnchors'
}
$zones
然后,例如:
$TTL = [System.TimeSpan]::FromHours(2) ## example TTL
Foreach ($DnsZone in $Zones) {
# Get all records in zone by not specifying -Name:
$records = $DnsZone | Get-DnsServerResourceRecord -ComputerName $DNSServer
$records | Foreach {
# This weird copy is due to awkward CIM references
$old = $_
$new = $_.Clone()
$new.TimeToLive = $TTL
# Update the TTL on the existing record:
Set-DnsServerResourceRecord -ComputerName $DNSServer -Old $old -New $new -ZoneName $DnsZone.ZoneName
}
}
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