Java Association/Composition/Aggregation (Has – A relationship) | Geek Ishu
Aggregation Kind, Specifies the Aggregation kind from the Source Class to the See "Relationships" in the TIBCO Business Studio Concepts Guide for more. CSS Cheat Sheet contains the most common style snippets: CSS gradient, background, button, font-family, border, radius, box and text shadow generators, color. The ultimate Citrix XenDesktop 7.x internals cheat sheet – Version . workings, any special considerations and/or relations to other services like the . This way the CSS can, and will ensure that all configuration data stored in can authenticate users to, and enumerate and aggregate resources from.
Analytics Service The Analytics Service does as the name implies: All data will be shared anonymously, encrypted and, as always, will be used for the greater good.
More to come As you can see on the graphical overview, more services are on their way. As a way to make these FMA services highly available, each service will need to register itself with a so-called peer service group, which contains all registered service instances of the same type. For example, if you have four Delivery Controllers you will also have four Broker services, of which only one will be active at a time.
All four Broker services will register themselves with the above mentioned service group the Broker service, service groupand they will do so at startup. After registration is successful this information is written to, and stored in the Central Site Database so that all active Delivery Controllers including their services will have access to this information whenever needed. This way, if the active Broker service fails for some reason, one of the other Broker services can and will take over.
This basically means that there will be a service group for every main FMA service, all eleven of them, the same principle applies.
Each service group has a unique identifier, which can be queried using the PowerShell SDK if and when needed. It serves multiple purposes, as we will find out shortly, but only after a VDA is able to successfully register itself with one of your Delivery Controllers. VDA registration As soon as a Virtual Delivery Agent starts up, meaning the desktop or server Operating System boots, it will try and register itself with one of the Delivery Controllers known within the Site.
For this to happen there needs to be a mechanism in place that tells the VDAs which Delivery Controllers are part of the same Site and how they can contact or reach them. Each VDA maintains a persistent storage location to store this information. When the auto-update feature is disabled, or does not supply the correct information, the VDA will check the following locations in this order: If a VDA is unable to register itself with a Delivery Controller or communication between the VDA and the Delivery Controller fails for any reason, you will not be able to connect to it.
Restarting the Citrix Desktop service on the VDA triggers the registration process and can be used to force re-registration when needed. The XML service will again play an important role throughout the whole process. Here it does not matter how we are connected: It the Broker service does this by communicating with underlying Hypervisor platform through the Host service on the Delivery Controller.
Based on this information, the StoreFront server will generate a launch. This is sent down to the user. The Delivery Controller checks with the Citrix License Server to verify that the end-user has a valid ticket. A big change when compared to the IMA where every Session Host would communicate with the license server.
At this time any applicable session policies will be passed on to the VDA and the session is launched. The CGP service will receive the connection and sends this information on to the tcpip. Then the ICA Service will lock the workstation because the user needs to be authenticated to ensure that the user is allowed access to that particular machine.
The two main services are the Citrix Desktop Services a. The Citrix Desktop service The Citrix Desktop service communicates directly with the Broker service over at the Delivery Controller and, as highlighted earlier, takes care of the initial VDA registration process through the Connection Brokering Protocol CBPwhich is a collection of WCF Windows Communication Foundation end points defined to exchange information and handle the registration process.
Once the VDA has been registered successfully the Citrix Desktop service will continue to communicate regularly with the Broker service on the Delivery Controller, also including a number of different feature plug-ins. It will receive instructions through the Citrix Desktop service protocol coming from the Broker service over at the Delivery Controller. As soon as it is notified of a new connection request, and after AD authentication has taken place, and ticketing, licensing and HDX policy information has been successfully exchanged, the ICA stack will start listening for incoming connections allowing the launch request to complete.
Here it is also worth noting that when working with older VDAs 5. What surprises me though, is that the Server VDA is almost never mentioned, while this is, or at least was a brand-new component.
Never before was it optional to install a relatively lightweight agent onto a XenApp server, it was basically all or nothing. The ICA stack, and this goes for the RDP protocol stack as well, is made up out of a whole bunch of different components all running and interacting within kernel mode. Of course, similar functionality does exist but is handled by different components and services. And of course, we can use multiple Operating Systems throughout our Site if needed or desired. The ICA stack itself has changed very little with the introduction of the FMA, one of its biggest changes is to be found in its communication interface, which is now better known as the earlier mentioned Broker Agent.
As you will see in the graphical overview below, the above mentioned Citrix StackControlService, a. SCService64, will act as an interface between the Broker Agent a.
To a certain extent, you could say that the SCService The same can be said for the PortICAsvc. Needless to say, it is an important part of your infrastructure: Of course, the Local Host Cache helps in keeping certain resources available even when the Central Site database is offline, as does Connection Leasing.
The Configuration-Logging database stores information about all Site configuration changes taking place, including other administrative activities. This database is only used when the Configuration-Logging feature is enabled, which it is by default.
The Monitoring database stores all information used by Director, like session and connection information. Database sizing When properly sizing your FMA Central Site database you need to keep your eye on two files in particular: The later contains a record of all transactions, including any database modifications that might have been made by a transaction.
However this does depend on how you configure the Transaction-Log to handle data. You have the following options: In this mode no log backups are required, meaning that no transaction log data will be saved. If the database fails, all changes made to the database since the last full back up must be redone.
This mode does require backup logs. If the database fails no work is lost. All data or any specific point in time can be recovered. Full Recovery mode is needed for database mirroring. This model is an adjunct of the full recovery model that permits high-performance bulk copy operations. It is typically not used for Citrix databases.
When backing up your Site database on a daily basis, or at least multiple times per week, simple recovery mode will probably be sufficient. If Site configuration changes are constant, multiple times per week or daily even, then Full Recovery mode might be Always make sure that high performance storage is used for your SQL infrastructure, SSDs preferably.
Site Database Typically, the size of your Central Site database will depend on multiple factors. Since the information stored is both static as well as dynamic, its size can vary during the day. The following factors need to be taken into consideration: A long-awaited feature by many Citrix admins globally.
Though many of us are familiar with the LHC feature within 6. The same applies to the Citrix Cloud CC by the way. Even when your CC, or on-premises Database becomes unreachable, or goes offline for other reasons the LHC will have your back.
Remember that with CC the so-called cloud-connector basically replaces your on-premises Delivery Controller. I am not sure what the word is on CL going forward, if it will be deprecated, when etc.? The Principal Broker Service will accept connection requests from StoreFront and it communicates with the Central Site Database just like before — brokering connections, taking care of load balancing and so on.
See the image below for a graphical overview on all this. Every two minutes the Principal Broker Service will be checked for configuration changes. The above-mentioned configuration changes include but are not limited to published icons, changes to Delivery Groups and Catalogs, certain Citrix policies and so on.
It is installed automatically when you install a new controller or upgrade a controller prior to version 7. From the E-Docs — In the unlikely event that an outage begins during a synchronization, the current import is discarded and the last known configuration is used.
Hmm… sounds familiar, right? However, do note that the Local Host Cache is supported for server-hosted applications and desktops, and static desktops; it is not supported for pooled VDI based desktops. In other words, resources need to be assigned. In short, you will have to account for some additional memory on top of the usual requirements when it comes to sizing your delivery Controllers. Citrix testing has shown that with a logon rate 10 logons per second the database will grow around one MB every minutes.
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As soon as normal operations resume the local database will be re-created also reclaiming the earlier used space. It goes without saying that your Delivery Controllers will need to have sufficient free disk space to cope with this. This will result in a higher than average CPU usage, something to keep in mind as well. To enable LHC use: The same thing happens when the LHC is disabled, see below: CDF Control When it comes to troubleshooting you have a few options, for one you can start by checking the event logs a couple of specific events might be generated, see E-Docsafter enablement the CSS can produce a trace report you can force it to and finally the Broker Service configuration can be exported for debugging purposes.
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