HI, 唐工
我非常高兴看到你的反馈。对于你的问题我说几点我的看法。
Q1:跟用户使用微软的远程桌面直接登录到XenApp 服务器去访问没啥区别
A:从表现上看是一样的。但是要注意的是,XA走的是ICA协议,TS是RDP。在传输效率上是不一样的;
Q2:桌面是win2003或者2008服务器桌面,不能发布XP或者win7的桌面给用户使用
A:Windows2008/2008R2在桌面表现上可以做到和Win7完全一致,包括Aero桌面体验、无线网络打开、音频体验,唯一和Win7不同的是你需要在“组件”和“功能中”手工打开它们;
Q3:用户可以看到后台的管理组件包括citrix AMC管理控制台,CPS等,安全性非常低
A:如果只是简单的发布一个桌面给用户使用,我同意你的观点。所以我想特别说明几点:
1. 在文章中特别强调了场景是:Users are mostly within one or two applications all day. One or two applications no browser-based activity。 所以不适合于多应用发布。
2. XenApp服务器必须做安全加固操作。强调一点是任何应用虚拟化的项目XenApp服务器都必须做安全加固操作,也就是说不是这种方式才要做的。锁定/安全加固服务器之后桌面完全是定制化的,包括桌面的图标,开始菜单的展现,文件夹的访问,快捷方式(开机关机注销等),停止命令提示符等等。对于一般的用户来说,可以基本达到比较安全的效果。这里给一些推荐的文章包括:
http://technet.microsoft.com/en-us/library/cc264467.aspx
http://blogs.technet.com/b/tonyso/archive/2008/02/27/how-to-harden-terminal-services.aspx
Locking Down Windows Server 2003 Terminal Server Sessions
http://support.citrix.com/article/CTX114938
http://support.microsoft.com/kb/278295
http://www.msterminalservices.org/articles/Locking-Down-Windows-Terminal-Services.html
http://www.brianmadden.com/blog/BrianMadden/How-do-you-lock-down-a-Terminal-Server
http://blogs.technet.com/tonyso/archive/2008/02/27/how-to-harden-terminal-services.aspx
3. 采用Citrix的其他技术配合使用,包括使用Profile Manager、PVS技术对XA Server的发布来加强系统架构的灵活性和安全性。
Regards,
Eric
From: tangfeiliang [mailto:tangfl@stone-soft.com.cn]
Sent: Wednesday, March 23, 2011 11:51 PM
To: Eric Yao
Subject: Re: 基于主机的共享桌面还是基于主机的虚拟桌面?
姚工,您好!
非常感谢,这些资料太重要了!有个问题我想知道,XenApp Server 共享桌面(基于主机的共享桌面)是不是指在XenApp的应用发布向导里直接把XenApp服务器桌面发布出来的那个桌面? 但是那个桌面发布出来的话,是XenApp Server 服务器的桌面,跟用户使用微软的远程桌面直接登录到XenApp 服务器去访问没啥区别,而且桌面是win2003或者2008服务器桌面,不能发布XP或者win7的桌面给用户使用,而且用户可以看到后台的管理组件包括citrix AMC管理控制台,CPS等,安全性非常低,没有实用价值,除非用户是管理员,把XenApp Server 服务器的桌面发布给远程的管理员来维护的话还比较实用,不知道我说的是不是你指的那个Hosted Shared Desktop ?
2011-03-23
Best Regards
唐飞良 Philiane.Tang
系统工程师 System Engineer
北京四通管理软件技术有限公司 Beijing Stone Software Technology Co.,Ltd
Tel: 86-20-38767374
Mobile: 86-13822156503
Website:www.stone-soft.com.cn
地址:广州市体育西路189号城建大厦17楼G单元
Address:Room 17G, No.189 Tiyuxi Road, Guangzhou, P.R.China
发件人: Eric Yao
发送时间: 2011-03-22 12:35:27
主题: 基于主机的共享桌面还是基于主机的虚拟桌面?
HI, 唐飞良
我们都知道Citrix有应用虚拟化和桌面虚拟化,但是应用虚拟化就是seamless windows? 难道用户想要个性化桌面就只能使用VDI桌面虚拟化的方案?答案是:NO.
我推荐大家看看下面的两篇文章,他详细解释了XenApp Server 共享桌面(基于主机的共享桌面还)和VDI虚拟桌面的不同,它告诉我们除了你熟悉的应用虚拟化和桌面虚拟化,其实还有一种叫做基于主机的共享桌面,就是XenApp上的桌面共享,请不要忽视它的存在,在很多用户场景中,他完全可以替代VDI方案。http://community.citrix.com/display/ocb/2011/02/04/Hosted+Shared+or+Hosted+Virtual+Desktops+%28XenApp+or+XenDesktop%29
在什么场景下使用基于主机的共享桌面呢? 这取决于用户的需求。我们把用户分组分析一下:
Group |
Description |
Recommendation |
Group 1 |
Users are mostly within one or two applications all day. This application is the main line of business application. Their performance is based on speed and accuracy. |
Hosted Shared Desktop |
Group 2 |
Users have a core set of applications they require to do their jobs. Oftentimes, these users must be able to modify system-level settings like environment variables, or install their own applications |
Hosted Virtual Desktop (Dedicated) |
Group 3 |
Users focus on content creation utilizing Microsoft Office and Adobe Photoshop. They users also browse for content and graphics online via a browser. |
Hosted Shared Desktop |
Group 4 |
Users utilize a few applications that consume significant amounts of CPU resources when doing certain activities (video rendering or code compiling) |
Hosted Virtual Desktop (Streamed to Blade) |
Group 5 |
Users require admin-level priviledges for certain applications |
Hosted Virtual Desktop (Pooled) |
Group |
Description |
Light |
One or two applications no browser-based activity |
Normal |
Multiple applications with limited browser-based activity |
Power |
Many simultaneous applications with extensive browser-based activity and Internet-based applications. |
Heavy |
Few applications but have heavy system resource requirements. Data processing, compiling, or graphics manipulation are common applications. |
有着简单应用的用户难道就一定要一个只属于自己的基于VDI的虚拟桌面吗?看看下面的开销就知道那种性价比最高了?
User Group |
Operating System |
vCPU Allocation |
Memory Allocation |
Avg IOPS (Steady State) |
Estimate Users/Core |
Light |
Windows XP |
1 |
768MB-1 GB |
3-5 |
10-12 |
|
Windows 7 |
1 |
1-1.5 GB |
4-6 |
8-10 |
上图基于VDI的解决方案中超过80%的内存其实是被OS消耗掉的,剩下的内存才是给Applications的,但是如果Apps运行在XenApp Server上,我们发现大部分内存又是可以被共享的。
如果你担心的是XenApp Server 共享桌面看起来不像是自己的操作系统,现在到了Windows2008时代,它也能配置成像Windwos7了。
在读完上面两篇文章后,欢迎你就这个议题来信讨论。
Best Regards
Eric Yao(姚臻) CISSP CISA
System Engineer
Citrix Systems Information Technology (Beijing) Ltd.
Guangzhou Branch
Tel: +86-20-2885 8203
Fax: +86-20-2885 8369
Cellphone: +86-186 6608 8565
Customer Service: 108006100263; 108002610263
Mailbox: eric.yao@citrix.com
Msn: eric.yaozhen@gmail.com
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