In the End-User Computing community, there’s an influx of interest in introducing, or changing to, public cloud-based solutions for VDI (Virtual Desktop Infrastructure). This interest is leading some to Citrix Cloud. Part 1 of this blog series touched on the Citrix Cloud Virtual Apps and Desktops service architecture, its available regions and its global footprint. In part 2, we continue to help you decide if the Citrix Cloud Virtual Apps and Desktops service is right for you.
For a service such as VDI that is crucial to your organization, the decision to move to the cloud can be a weighty one. But it doesn’t have to be. The right knowledge will make it easier to decide. Here’s a list of common questions and answers that should help.
Which cloud providers are supported?
The supported cloud providers for resource locations are Microsoft Azure, Amazon Web Services (AWS), Google Cloud Platform, Oracle Cloud, and IBM Cloud.
As discussed in part 1, Citrix Cloud runs on Azure. Because of this, Azure tends to be the most recommended cloud provider—since it integrates with everything Citrix Cloud brings to the table: power management, Machine Creation Services (MCS) support, and (in some scenarios) virtual machines that perform better, when compared to AWS. You can also leverage other services in Citrix Cloud, such as App Layering to be supported directly with Azure.
But AWS also plays well. Many traditional hosted shared desktops and apps run great on AWS since they have lots of feature parity.
Google has better prices, is more flexible, and is rumored to be faster than Azure & AWS in performance testing. Google’s only limitation is it lacks all the Citrix on-prem features, but Citrix is working to close the gap on that this year, and not all customers require the features that are absent.
What hypervisors are supported?
The supported hypervisors for resource locations are Microsoft Hyper-V, VMWare ESXi, Citrix Hypervisor (formerly XenServer), and Nutanix AHV.
These all have their supporters, however for most environments the choice will be dictated by what is already running in the organization.
How many releases are there, and which should I use?
There are currently 3 release strains: Current Release (CR), Long Term Service Release (LTSR) and Cloud Release. You can mix and use the latest CR or LTSR with Citrix Cloud.
- CR is for environments that want to stay cutting-edge with the latest new features. CR requires organizations to upgrade every 6 months to stay supported.
- LTSR is recommended for environments that prefer to retain the same base version for an extended period. With LTSR you receive 5 years of mainstream support and (with a fee) 5 years of extended support.
- Cloud Release always runs the latest versions.
If you use Windows Server 2016 or 2019, you may want to use the CR version of the VDA. If you use Windows Server 2008 R2, best to use the LTSR version of the VDA.
Take a look at the “top eight killer features” in CR.
How does licensing work?
Citrix Virtual Apps and Desktops service is licensed on a per-user basis. On-prem user licensing options (user/device or concurrent) are not available in the cloud service.
Licenses can be released by the admin after 30 days of user inactivity, versus 90 days with on-prem Citrix license server. Concurrent licenses are also offered in a premium-plus package, for some hybrid transactions.
What are my options for deployment?
The main deployment types are:
- A 2-year hybrid use-right that doesn’t require you to do anything for 2 years, after which you must let Citrix Cloud manage the control plan. Your workloads or VDAs can still be on-prem, or wherever you prefer.
- Letting Citrix Cloud manage the control plane, but leaving workloads on-prem. I’ve seen this approach when on-prem hardware is still cost-effective.
- Deploying Citrix Cloud and gradually migrating to the public cloud as hardware needs replacing. This approach makes sense when on-prem hardware investment is still cost-effective and hasn’t depreciated in cost. But as it depreciates and goes out of date, you can move workloads to the public cloud.
- Deploying Citrix Cloud with a hybrid approach. An example of this is moving some virtual apps and desktops to a hosted shared server operating system model but hosting Windows 7/10 virtual desktops on-prem due to the cost of a virtual desktop infrastructure (VDI). Having a hosted shared server for multiple users on one machine can be cost-effective, versus having a 1-to-1 relationship and the machine cost of VDI.
How do I keep track of the health of my cloud-based resources?
How does Citrix Cloud handle identity and access management?
Six identity and access management providers may be used to administer and subscribe to Citrix Cloud. The default is Citrix Identity provider, but you can change this to use on-prem AD, AD plus token, Azure AD, Citrix Gateway, or Okta.
How Secure is Citrix Cloud?
Citrix Cloud hosts the management stack on Azure, while workloads and Active Directory stay within your resource locations. So, from a security standpoint, they don’t touch core IP—not even with Machine Creation Services, which is simply using host connection APIs for clone and power management of the supported cloud provider or hypervisor. Citrix can’t get into them and does not store sensitive customer information. With Active Directory, Citrix conducts a live read only, and gets out. Active Directory is never synced to the cloud; it stays within the resource location. Then, as with all configurations, there’s metadata (which user logged-in, etc.) that is hosted in the cloud with a logical partition (which Citrix makes sure is isolated so there’s no data leakage). For this data-in-flight, industry standard Transport Layer Security (TLS) 1.2 is used with strong cipher suites over port 443.
You may also use the Service Health Dashboard website mentioned above for transparency into security issues that can impact customers.
As of March 15, 2019, communication over TLS 1.0 and 1.1 has been blocked to improve security. Only TLS 1.2 is permitted. This means you’re required to use the latest versions of Citrix Receiver or the Citrix Workspace app:
- Citrix Receiver for Windows 4.12.100 or later
- Citrix Receiver for Mac 12.0 or later
- Citrix Receiver for Linux 13.2 or later
- Citrix Receiver for Android 3.7 or later
- Citrix Receiver for iOS 7.0 or later
- Citrix Workspace app (all operating systems) 1808 or later
If you need to be FIPS (Federal Information Processing) compliant, support for that standard is available.
How does Citrix Cloud handle Credentials?
The Virtual Apps and Desktops service handles 4 types of credentials: User credentials, Admin credentials, Hypervisor passwords, and AD credentials.
User credentials come into play when using customer-managed StoreFront servers. In this scenario, credentials are encrypted by the Cloud Connector using AES-256 encryption and a random one-time key generated for each launch. The key is then passed to the VDA by the Citrix Workspace app (formerly Citrix Receiver) to decrypt the password during single sign-on session launch. The following diagram helps visualize the flow.
Admin credentials come into play when you authenticate into Citrix Cloud. In this scenario, a one-time JSON Web Token (JWT) is generated to provide access.
Hypervisor credentials are needed when on-prem hypervisors are configured for a host connection. The credentials are stored encrypted in an SQL database in the cloud.
AD credentials come into play when Machine Creation Services uses Cloud Connectors for provisioning machine accounts in the customer’s AD.
Does Citrix Cloud still work if there are network issues?
For environments that require a higher level of resiliency, the local host cache feature is available to enable users to continue working when, or if, a Cloud Connector loses communications with Citrix Cloud for 20 seconds, but the caveat is (as a requirement) you must have an on-prem StoreFront per resource location.
Please stay tuned for part 3 of this series where we’ll continue to help you decide if the Citrix Cloud Virtual Apps and Desktops service is right for you.
Lastly, to learn more about Citrix Cloud Virtual Apps and Desktops service or Desktop as a Service, please reach out to us. We’d love to help you!
Architect, End User Computing at Anexinet
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