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<h1 id="add-dbaagreplica">Add-DbaAgReplica</h1>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Author</strong></td>
<td>Chrissy LeMaire (@cl), netnerds.net</td>
</tr>
<tr>
<td><strong>Availability</strong></td>
<td>Windows, Linux, macOS</td>
</tr>
</tbody>
</table>
<p> </p>
<p>Want to see the source code for this command? Check out <a href="https://github.com/dataplat/dbatools/blob/master/public/Add-DbaAgReplica.ps1">Add-DbaAgReplica</a> on GitHub.
<br>
Want to see the Bill Of Health for this command? Check out <a href="https://dataplat.github.io/boh#Add-DbaAgReplica">Add-DbaAgReplica</a>.</p>
<h2 id="synopsis">Synopsis</h2>
<p>Adds a replica to an availability group on one or more SQL Server instances.</p>
<h2 id="description">Description</h2>
<p>Adds a replica to an availability group on one or more SQL Server instances.</p>
<p>Automatically creates database mirroring endpoints if required.</p>
<h2 id="syntax">Syntax</h2>
<pre><code>Add-DbaAgReplica
[-SqlInstance] <DbaInstanceParameter[]>
[[-SqlCredential] <PSCredential>]
[[-Name] <String>]
[[-ClusterType] <String>]
[[-AvailabilityMode] <String>]
[[-FailoverMode] <String>]
[[-BackupPriority] <Int32>]
[[-ConnectionModeInPrimaryRole] <String>]
[[-ConnectionModeInSecondaryRole] <String>]
[[-SeedingMode] <String>]
[[-Endpoint] <String>]
[[-EndpointUrl] <String[]>]
[-Passthru]
[[-ReadOnlyRoutingList] <String[]>]
[[-ReadonlyRoutingConnectionUrl] <String>]
[[-Certificate] <String>]
[-ConfigureXESession]
[[-SessionTimeout] <Int32>]
[-InputObject] <AvailabilityGroup>
[-EnableException]
[-WhatIf]
[-Confirm]
[<CommonParameters>]
</code></pre>
<p> </p>
<h2 id="examples">Examples</h2>
<p> </p>
<h5 id="example-1">Example: 1</h5>
<pre><code>PS C:\> Get-DbaAvailabilityGroup -SqlInstance sql2017a -AvailabilityGroup SharePoint | Add-DbaAgReplica -SqlInstance sql2017b
</code></pre>
<p>Adds sql2017b to the SharePoint availability group on sql2017a<br></p>
<h5 id="example-2">Example: 2</h5>
<pre><code>PS C:\> Get-DbaAvailabilityGroup -SqlInstance sql2017a -AvailabilityGroup SharePoint | Add-DbaAgReplica -SqlInstance sql2017b -FailoverMode Manual
</code></pre>
<p>Adds sql2017b to the SharePoint availability group on sql2017a with a manual failover mode.<br></p>
<h5 id="example-3">Example: 3</h5>
<pre><code>PS C:\> Get-DbaAvailabilityGroup -SqlInstance sql2017a -AvailabilityGroup SharePoint | Add-DbaAgReplica -SqlInstance sql2017b -EndpointUrl 'TCP://sql2017b.specialnet.local:5022'
</code></pre>
<p>Adds sql2017b to the SharePoint availability group on sql2017a with a custom endpoint URL.<br></p>
<h3 id="required-parameters">Required Parameters</h3>
<h5 id="sqlinstance">-SqlInstance</h5>
<p>The target SQL Server instance or instances. Server version must be SQL Server version 2012 or higher. <br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>True</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="inputobject">-InputObject</h5>
<p>Accepts availability group objects from Get-DbaAvailabilityGroup for pipeline operations. This is the target availability group where the replica will be added.<br />
Use pipeline scenarios like 'Get-DbaAvailabilityGroup -AvailabilityGroup "AG1" | Add-DbaAgReplica -SqlInstance server2' for streamlined replica management. <br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>True</td>
</tr>
<tr>
<td>Pipeline</td>
<td>true (ByValue)</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="optional-parameters">Optional Parameters</h3>
<h5 id="sqlcredential">-SqlCredential</h5>
<p>Login to the target instances using alternative credentials. Accepts PowerShell credentials (Get-Credential).<br />
Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.<br />
For MFA support, please use Connect-DbaInstance.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="name">-Name</h5>
<p>Sets the display name for the availability group replica being added. Defaults to the SQL Server instance's domain instance name.<br />
Use this when you need a custom replica name that differs from the server name, such as for clarity in multi-subnet scenarios.<br />
This parameter is only supported when adding a replica to a single instance.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="clustertype">-ClusterType</h5>
<p>Specifies the underlying clustering technology for the availability group. Only supported in SQL Server 2017 and above.<br />
Use 'Wsfc' for traditional Windows Server Failover Cluster setups, 'External' for Linux Pacemaker clusters, or 'None' for read-scale availability groups.<br />
Defaults to 'Wsfc' which handles most Windows-based high availability scenarios.<br />
The default can be changed with:<br />
Set-DbatoolsConfig -FullName 'AvailabilityGroups.Default.ClusterType' -Value '...' -Passthru | Register-DbatoolsConfig<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>(Get-DbatoolsConfigValue -FullName 'AvailabilityGroups.Default.ClusterType' -Fallback 'Wsfc')</td>
</tr>
<tr>
<td>Accepted Values</td>
<td>Wsfc,External,None</td>
</tr>
</tbody>
</table>
<h5 id="availabilitymode">-AvailabilityMode</h5>
<p>Controls how the replica commits transactions relative to the primary replica. SynchronousCommit waits for secondary confirmation before committing, ensuring zero data loss but higher latency.<br />
AsynchronousCommit commits immediately on primary without waiting for secondary confirmation, providing better performance but potential data loss during failover.<br />
Defaults to SynchronousCommit for maximum data protection.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>SynchronousCommit</td>
</tr>
<tr>
<td>Accepted Values</td>
<td>AsynchronousCommit,SynchronousCommit</td>
</tr>
</tbody>
</table>
<h5 id="failovermode">-FailoverMode</h5>
<p>Determines whether the replica can automatically fail over when the primary becomes unavailable. Automatic failover requires SynchronousCommit availability mode and provides seamless high<br />
availability.<br />
Manual failover requires DBA intervention but works with both synchronous and asynchronous commit modes.<br />
Defaults to Automatic for immediate failover capabilities.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>Automatic</td>
</tr>
<tr>
<td>Accepted Values</td>
<td>Automatic,Manual,External</td>
</tr>
</tbody>
</table>
<h5 id="backuppriority">-BackupPriority</h5>
<p>Sets the replica's preference for hosting backups within the availability group, ranging from 0-100 where higher values indicate higher priority.<br />
Use this to designate specific replicas for backup operations, such as setting secondary replicas to higher values to offload backup workloads from the primary.<br />
Defaults to 50, giving all replicas equal backup preference.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>50</td>
</tr>
</tbody>
</table>
<h5 id="connectionmodeinprimaryrole">-ConnectionModeInPrimaryRole</h5>
<p>Controls which client connections are allowed when this replica is the primary. AllowAllConnections permits both read-write and read-only connections.<br />
AllowReadWriteConnections restricts access to connections that specify read-write intent, blocking read-only connection attempts.<br />
Defaults to AllowAllConnections for maximum compatibility with existing applications.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>AllowAllConnections</td>
</tr>
<tr>
<td>Accepted Values</td>
<td>AllowAllConnections,AllowReadWriteConnections</td>
</tr>
</tbody>
</table>
<h5 id="connectionmodeinsecondaryrole">-ConnectionModeInSecondaryRole</h5>
<p>Controls client access to secondary replicas for read operations. AllowNoConnections blocks all client connections to the secondary.<br />
AllowReadIntentConnectionsOnly permits only connections that specify ApplicationIntent=ReadOnly, ideal for reporting workloads.<br />
AllowAllConnections allows any client connection regardless of intent. Defaults to AllowNoConnections for security and performance.<br />
The default can be changed with:<br />
Set-DbatoolsConfig -FullName 'AvailabilityGroups.Default.ConnectionModeInSecondaryRole' -Value '...' -Passthru | Register-DbatoolsConfig<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>(Get-DbatoolsConfigValue -FullName 'AvailabilityGroups.Default.ConnectionModeInSecondaryRole' -Fallback 'AllowNoConnections')</td>
</tr>
<tr>
<td>Accepted Values</td>
<td>AllowNoConnections,AllowReadIntentConnectionsOnly,AllowAllConnections,No,Read-intent only,Yes</td>
</tr>
</tbody>
</table>
<h5 id="seedingmode">-SeedingMode</h5>
<p>Controls how databases are initially synchronized on the secondary replica. Requires SQL Server 2016 or later.<br />
Automatic seeding transfers data directly over the network without manual backup/restore operations, ideal for large databases or automated deployments.<br />
Manual seeding requires you to manually backup databases on the primary and restore them on the secondary, providing more control over the timing and process.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
<tr>
<td>Accepted Values</td>
<td>Automatic,Manual</td>
</tr>
</tbody>
</table>
<h5 id="endpoint">-Endpoint</h5>
<p>Specifies the name of the database mirroring endpoint to use for availability group communication. Automatically locates existing endpoints or creates one if needed.<br />
Use this when you need a custom endpoint name instead of the default "hadr_endpoint" that gets created automatically.<br />
Each SQL Server instance requires a database mirroring endpoint for Always On availability group replication.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="endpointurl">-EndpointUrl</h5>
<p>Overrides the default endpoint URL with custom network addresses for availability group communication. Defaults to the FQDN from the existing endpoint.<br />
Required for special network configurations like multi-subnet deployments, NAT environments, or when replicas need specific IP addresses for cross-network communication.<br />
Must be in format 'TCP://system-address:port' with one entry per instance. When creating new endpoints, IPv4 addresses in the URL will be used for endpoint configuration.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="passthru">-Passthru</h5>
<p>Returns the replica object without actually creating it in the availability group, allowing for additional customization before final creation.<br />
Use this when you need to modify replica properties that aren't exposed as direct parameters before adding it to the availability group.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>False</td>
</tr>
</tbody>
</table>
<h5 id="readonlyroutinglist">-ReadOnlyRoutingList</h5>
<p>Defines the priority order of replica server names for routing read-only connections when this replica serves as the primary. Requires SQL Server 2016 or later.<br />
Use this to direct reporting queries to specific secondary replicas, creating an ordered list like @('Server2', 'Server3') to balance read-only workloads.<br />
This parameter is only supported when adding a replica to a single instance.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>