添加Web角色的实例时，Azure Worker角色将重新启动

Question

我有一个带有Web角色和Worker角色的Windows Azure云服务。我已经建立了一个网站，允许我对云服务执行各种管理功能（停止/启动、重新启动实例、添加实例、删除实例）。所有功能都是通过web api执行的。我的问题是，当我添加web角色的实例时，工作者角色会重新启动。请注意，如果我通过Azure门户添加实例，则不会发生这种情况。代码在所有其他方面都能正常工作。你知道如何做到这一点吗？这样只有受影响的角色才能回收，而不是所有角色都能回收？

我的代码：

    public void AddInstance()
    {
        XDocument configDoc = this.GetDeploymentConfiguration();
        var ns = configDoc.Root.GetDefaultNamespace();
        configDoc.Root
            .Elements( ns + "Role" )
            .FirstOrDefault( r => r.Attribute( "name" ).Value.ToLower() == this.RoleName.ToLower() )
            .Element( ns + "Instances" )
            .Attribute( "count" )
            .Value = ( int.Parse( configDoc.Root
                           .Elements( ns + "Role" )
                           .FirstOrDefault( r => r.Attribute( "name" ).Value.ToLower() == this.RoleName.ToLower() )
                           .Element( ns + "Instances" )
                           .Attribute( "count" )
                           .Value ) + 1 ).ToString();
        string encodedString = Convert.ToBase64String( Encoding.UTF8.GetBytes( configDoc.ToString() ) );
        this.SetDeploymentConfig( encodedString );
    }
    public XDocument GetDeploymentConfiguration()
    {
        string uri = string.Format( this.servicePropertiesOperationFormat, this.subscriptionID, this.serviceName, "production", "" );
        ServiceManagementOperation operation = new ServiceManagementOperation( this.thumbprint, this.versionID );
        var xdoc= operation.Invoke( uri );
        var myelm = xdoc.Element( wa + "Deployment" ).Element( wa + "Configuration" );
        var mystring=  Encoding.UTF8.GetString( Convert.FromBase64String( myelm.Value ) );
        return XDocument.Parse( mystring );
    }
    public string SetDeploymentConfig( string configurationFile )
    {
        string uri = string.Format( this.servicePropertiesOperationFormat, this.subscriptionID, this.serviceName, "production", "/?comp=config" );
        ServiceManagementOperation operation = new ServiceManagementOperation( this.thumbprint, this.versionID );
        string payloadString = string.Format(
            @"<?xml version=""1.0"" encoding=""utf-8""?>
            <ChangeConfiguration xmlns=""http://schemas.microsoft.com/windowsazure"">
                    <Configuration>{0}</Configuration>
            </ChangeConfiguration>", configurationFile );
        XDocument payload = XDocument.Parse( payloadString );
        return operation.Invoke( uri, payload );
    }

Answer 1

这不是很直观，但你必须取消缩放事件，否则这将告诉Azure重新启动其他实例。在RoleEntryPoint文件中的OnStart方法中添加以下行：

RoleEnvironment.Changing += (sender, args) => { args.Cancel = false; };