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Workspace Environment Management service.Tech Brief: Workspace Environment Management | Citrix Tech Zone
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Citrix workspace environment. Workspace Environment Management (WEM) 2212
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WEM has several security features that bolster the security posture of the deployment. It is a software-only, driver-free solution. Workspace Environment Management can be installed on-premises or accessed as a service from Citrix Cloud.
It is installed on Windows session hosts or physical machines that WEM manages. WEM agent monitors the host in real time and reports the state of the machine. It receives instructions from the WEM infrastructure services to apply policy settings on the machine and configure it. It interacts with the infrastructure server and allows admins to control the various features. WEM Infrastructure server — Installed on a multi-session Windows OS machine, the services facilitate the communication and synchronization between the various components of the WEM deployment.
When the Citrix Cloud hosted WEM service is used, the control and database components are hosted in the cloud and managed by Citrix. The admin console, the infrastructure services, and the database hosted in Azure SQL are part of the service.
Cloud Connectors — A Citrix Cloud Connector is the conduit for communication from entities in a resource location with the Citrix Cloud services.
For resiliency we suggest that at least a pair of cloud connectors is installed in each resource location. The agents maintain a local cache of the settings to be resilient to network interruptions and service outages. As of writing of this article, a single service instance can support , WEM agents. The migration involves exporting the on-premises SQL server contents and uploading them to the service.
Having understood the architecture of both the on-premises and service offerings of WEM, lets look at the features that WEM makes available to organizations. There are three main feature sets:. To provide the best experience for users the WEM agent monitors and analyzes user and application behavior within the session, in real time.
When a new process is launched, it takes up more RAM than it needs for its normal running. But generally, the process does not relinquish these resources once they are allocated to it. WEM in real time detects which processes are in focus of the user. A portion of the RAM working set of apps that are not in focus can then be reclaimed. It is observed that even if these apps come back into focus, they generally need a smaller subset of the amount of RAM that was reclaimed from them.
These actions optimize RAM consumption in the cloud and increase single server scalability. The following graph shows the amount of memory consumed by a set of sessions, with and without WEM. If a process is detected to be hogging CPU resources, this can negatively affect not only the session that it is running in, but also slow down other sessions running on the same machine and even impact log on times for other users.
When a process is detected to be hogging CPU resources for a defined amount of time , WEM automatically reduces the priority of the process. This action allows other process to use the CPU and alleviates server load. When the process is seen to have returned to low CPU consumption overtime, then its priority is reset back to normal. To simulate a noisy neighbor, a user not part of the LoginVSI knowledge worker test run, is added to the test setup.
As can be seen from the following table, the inclusion of WEM, suppresses the effect of the CPU consuming noisy neighbor. Resulting in a higher number of users that can run on a single VM, even in the stress scenario.
As WEM reduces CPU spikes, another important inference from the results is, that the response time for the user is much better. Citrix Virtual Apps and Desktops sessions have an almost ms lower response time when compared to the baseline at the instant VSImax is reached for the same number of users. Both these results point to a much smoother and snappier user experience when WEM is in the picture. To deliver the best possible logon performance, WEM service replaces commonly used Windows Group Policy Object objects, logon scripts, and preferences with an agent, which is deployed on each virtual machine or server.
The agent is multi-threaded and applies changes to user environments only when required, ensuring that users always have access to their desktop as quickly as possible. Time consuming processes are handled out of sync with the initial logon process. Watch the Tech Insight video about Logon optimization here. Provides a management interface to the Citrix Profile Management. Under the Citrix Profile Management Settings in Policies and Profiles , the console supports configuring all settings for the current version of Citrix Profile Management.
WEM includes several features that bolster the security posture and reduce the threat surface of the deployment. Setting application security policies AppLocker with Workspace Environment Management follows the same process as doing it from with group policy objects.
Admins create executable, Windows installer, scripts, package, and DLL rules. For each rule, the same options are available to base the rule on a publisher, path, or a file hash.
However, unlike AppLocker, WEM allows the admin to select multiple rules and change assigned users, making it easy to support hundreds of application security policies.
On many occasions, users need administrator privileges to be able to install or run applications. With most organizations adopting the principle of least privilege, end users generally are not given admin rights. In the scenarios when they are required the admin must either log in to the system physically or via remote access or provide the user with a temporary admin password. This practice is tedious for the admin or ends up in creation of workarounds to the security policy.
The apps that are on the approved list can be installed with this feature while the apps on the blocked list cannot be installed and the operations are logged. Each rule is based on either the path, the publisher, or the hash of the executable.
When a new rule is added three options are available: Apply to Child Processes , if you want to have child processes inherit the privilege elevation or not. The Start and End Time options allow the elevation to be restricted to a certain period. There are three types of configurations to deploy WEM. Use the type that suits the actual environment the best. This configuration can be used in an environment that has a single domain in a single forest.
Normally, this single domain contains all the resources and user objects. So, in this configuration, the admin only needs to deploy one set of Cloud Connectors to enable all your devices to connect to the WEM service. This configuration can be used in environments where multiple domains in a single forest exist. As the domains in the forest can communicate with each other, in this configuration, the admin only needs to deploy one set of Cloud Connectors to enable all your devices to connect to the WEM service.
In this configuration, users and resources reside in different domain forests for management purposes. A trust exists between the two forests that allows the users to log on to resources in another forest. In this deployment, the admin needs to deploy Cloud Connectors into each domain forest to complete the WEM deployment. The WEM service is designed for large-scale enterprise deployments. On the server side, WEM service monitors the communication flow between front- and back-end components and scales up or down dynamically based on data in transit.
When evaluating WEM service for sizing and scalability, the machine size and number of Cloud connectors is important. To ensure high availability, we recommend at least two Cloud Connectors in each resource location and based on the deployment options discussed before. To learn more, visit the WEM product documentation.
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