AD mode deployment stopped - missing reverse lookup zone entry for DC

Articol
11/18/2022

Important

The Microsoft SQL Server 2019 Big Data Clusters add-on will be retired. Support for SQL Server 2019 Big Data Clusters will end on February 28, 2025. All existing users of SQL Server 2019 with Software Assurance will be fully supported on the platform and the software will continue to be maintained through SQL Server cumulative updates until that time. For more information, see the announcement blog post and Big data options on the Microsoft SQL Server platform.

Deployment in Active Directory (AD) mode freezes. Check symptoms to see if cause is the domain controller DNS server is missing reverse lookup zone entry.

Symptom

You started deploying BDC with AD mode however the deployment is stuck and not moving forward.

The following example shows the deployment results in a bash shell.

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Cluster deployment documentation can be viewed at:
https://aka.ms/bdc-deploy
 
NOTE: Cluster creation can take a significant amount of time depending on
configuration, network speed, and the number of nodes in the cluster.
 
Starting cluster deployment.
Cluster controller endpoint is available at bdc-control.contoso.com:30080, 193.168.5.14:30080.
Waiting for control plane to be ready after 5 minutes.
Waiting for control plane to be ready after 10 minutes.
Waiting for control plane to be ready after 15 minutes.
Waiting for control plane to be ready after 20 minutes.
Waiting for control plane to be ready after 25 minutes.

Check the current deployed pods.

kubectl get pods -n mssql-cluster

The results below indicate that only pods belonging to the controller have been deployed. The pods for compute, data, or storage are not being created.

NAME              READY   STATUS    RESTARTS   AGE
control-rts5t     3/3     Running   0          18m
controldb-0       2/2     Running   0          18m
controlwd-csgst   1/1     Running   0          16m
dns-7kfnz         2/2     Running   0          16m
logsdb-0          1/1     Running   0          16m
logsui-2pc29      1/1     Running   0          16m
metricsdb-0       1/1     Running   0          16m
metricsdc-4rtm4   1/1     Running   0          16m
metricsdc-6lr2t   1/1     Running   0          16m
metricsdc-ftx9m   1/1     Running   0          16m
metricsdc-h59jb   1/1     Running   0          16m
metricsui-lvdpt   1/1     Running   0          16m
mgmtproxy-mkmxp   2/2     Running   0          16m

Inspect the security support container logs. Look for LDAP errors.

Check security-support container

Review the security-support container logs.

The following command collects the security-support logs in a cluster at namespace mssql-cluster.

azdata bdc debug copy-logs -n mssql-cluster -c security-support

Extract the logs and locate \mssql-cluster\control-<identifier>\controller\control-rts5t-controller-stdout.log.

Tip

There are multiple ways to collect the logs. Instead of copying the logs with Azure Data CLI (azdata), you can use a notebook in Azure Data Studio. In Azure Data Studio, connect to the Kubernetes cluster, and run an appropriate troubleshooting notebook. The following are examples of notebooks.

TSG027 - Observe cluster deployment
TSG061 - Get tail of all container logs for pods in BDC namespace
TSG001 - Run azdata copy-logs

Inspect the logs

Locate the log. The following example points to a controller deployment log.

<folderOfDebugCopyLog>\debuglogs-mssql-cluster-YYYYMMDD-HHMMSS\<namespace>\control-<identifier>\controller\control-<identifier>-controller-stdout.log"

YYYY-MM-DD HH:MM:SS.ms | ERROR | Failed to create AD user account 'cntrl-controller'. Error code: 53. Message: Failed to create user object: Failed to add object 'CN=cntrl-controller,OU=bdc, DC=CONTOSO, DC=com' to 'CONTOSO.COM': Server is unwilling to perform. 
YYYY-MM-DD HH:MM:SS.ms | ERROR | Failed to create AD user account 'ldap-user'. Error code: 53. Message: Failed to create user object: Failed to add object 'CN=ldap-user,OU=bdc, DC=CONTOSO, DC=com' to 'CONTOSO.COM': Server is unwilling to perform. 
YYYY-MM-DD HH:MM:SS.ms | ERROR | Failed to create AD user account 'nginx-mgmtproxy'. Error code: 53. Message: Failed to create user object: Failed to add object 'CN=nginx-mgmtproxy,OU=bdc, DC=CONTOSO, DC=com' to 'CONTOSO.COM': Server is unwilling to perform.

Cause

The reverse lookup zone entry for the domain controller in the domain controller DNS entry is missing.

Resolution

Run the following PowerShell script to confirm if you have reverse DNS entry (PTR record) configured.

#Domain Controller FQDN 'DCserver01.contoso.local'
$Domain_controller_FQDN = 'DCserver01.contoso.local'

#Performing Domain Controller DNS record, reverse PTR Checks...
$DcControllerDnsPtr_Result = New-Object System.Collections.ArrayList
try {
    $Domain_controller_DNS_Record = Resolve-DnsName $Domain_controller_FQDN -Type A -Server $Domain_DNS_IP_address -ErrorAction Stop
    foreach ($ip in $Domain_controller_DNS_Record.IPAddress) {
        #resolving hostname by IP address to make sure we have reverse PTR record 
        if ((Resolve-DnsName $ip).NameHost -eq $Domain_controller_FQDN) {
            [void]$DcControllerDnsPtr_Result.add("OK - $Domain_controller_FQDN has an A record with an IP $ip, Reverse PTR record is in place") 
        }
        else {
            [void]$DcControllerDnsPtr_Result.add("Missing - $Domain_controller_FQDN has an A record with an IP $ip, But no reverse PTR record was found for the host")
        }
    }
}
catch {
    [void]$DcControllerDnsPtr_Result.add("Error - " + $_.exception.message)
}

#show the results 
$DcControllerDnsPtr_Result

Next steps

Verify reverse DNS entry (PTR record) for domain controller.

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