Remote server. How to connect to a remote server. What is a remote office? How to create a remote server

A virtual server (or dedicated server) is an analogue of a computer, only in contrast to its role system unit performed by the data center. This is a separate room or even a complex of buildings with specialized equipment. Hardware failures are not uncommon, so the equipment in the data center has additional protection. All data is duplicated, and in the event of an accident, the user will not even notice that it has occurred. That is why the main consumer is system administrators and programmers to store their sites. Data loss is a disaster for them and is fraught with large losses.

For traders, a dedicated server can also be useful. It allows you to keep the Quik trading terminal and mechanical trading system(for example, the TradeHelp robot). It is very comfortable. At any time, you can turn off your computer and go about your business, and the server will function at this time, like all the programs installed there. In addition, you can change the entry point to the selected working space on the server, for example, from home on desktop computer or from work. There is no need to install any additional software on personal computers. Access is via remote desktop.

The provider provides resources to users for rent ( disk space, RAM, processor, reliable Internet connection). These resources can be assembled like a construction set, obtaining the optimal configuration for your tasks. If desired, it can be adjusted at any time.

The image below shows the optimal resource configuration for running the Quik and TradeHelp programs (using RuVDS as an example). If you need to run several terminals, then the configuration needs to be strengthened (by adding RAM - 1GB for each additional terminal Quik). If you plan to use the TradeHelp robot with a large number strategies (more than 6), then it is also necessary to increase the size of RAM in the constructor (up to 4 GB). In any case, you can start with a basic configuration (as in the picture) and if programs slow down, you can always increase the size of RAM.

There are other resources in the resource builder, such as selection type hard disk: regular HDD or SSD. In our case, we did not notice a big gain in performance, so you can buy a cheaper HDD. The “Protection against DDos attacks” parameter can also be omitted. DDos attacks are a rare event when someone from outside tries to block the server for a while. Usually large websites of organizations are attacked, but in our case the likelihood of this happening is extremely low. Even if there is some kind of pause (the server will not be accessible), access will still be restored within a few minutes. For most TradeHelp robot strategies, this pause will not affect trading in any way.

The algorithm for obtaining resources from the provider is as follows.

1. Choose one of the virtual server providers. We have selected several time-tested options: RuVDS, Ultra VDS, 1Cloud. RuVDS is the cheapest of all, perhaps due to the fact that they are new to the market and are gaining a customer base. A couple of years ago, Ultra VDS was the cheapest company, but even now the price tag is not much different from its competitors.
2. Using the calculator on the website, enter the following set of resources: OS Windows Server 20012 R2, 2 core processor, 3GB RAM, HDD at a minimum (most often 20 GB).
3. Click the “Order” or “Place an order” button. You will be prompted to log in or register. Next, fill out the fields step by step, confirm your phone number and email.
4. After you have ordered a server and logged in to your account on the provider’s website, you need to enter the “My Servers” section. The previously ordered server should already be created there. You may need to wait a few minutes until it is installed, or you may need to deposit money into your account to install it.
5. Depositing money. It's individual. You can pay using bank card, or using electronic money(WebMoney, Yandex money). The longer the period (month, quarter, six months, year), the cheaper the server rental will end up being.
6. After receiving payment, the server must already be installed, otherwise you will have to wait a few minutes.
7. Now all that remains is to simply log into the server via remote desktop. Below are instructions on how to do this.

Login to dedicated server ( virtual server) occurs via Remote Desktop. Everything is very simple. From the Start menu, select “Remote Desktop Connection”. In order not to search for a long time, you can click on the Start button and immediately type the characters “remote” on the keyboard. The search will offer several options, including the desired “Remote Desktop Connection” or “remote Desktop Connection”.

Or in English.

After you click on the remote desktop connection button, the following window will appear.

In the “Computer” field you need to enter the IP address of your server. This data can be found on the website of your provider, where you ordered the server in the “My Servers” section, or you should receive connection data by email. You need to know the server's IP address (numbers 123.123.123.123), username (usually Administrator) and password.

After entering the IP address in the window and clicking the “Connect” button, a window for entering the username and password will appear. As mentioned above, this data can be found on the website of your provider, where you ordered the server in the “My Servers” section, or there should be a letter in the mail with connection data. After entering the data and confirmation, another security window may appear. You need to confirm the launch of the remote desktop. If all is well, the Remote Desktop window will open.

Through this window you can interact with the server. Everything is as usual, there is the Start menu, my computer, desktop. There is a difference. At the top there is a specific strip with system buttons. If it is not there, then the window is either minimized, or you need to move the mouse to the top and the strip will appear. Using these buttons you can minimize or make the remote desktop window smaller.

The clipboard is working. To copy something to the server, you need to press Ctrl+C on your computer, then go to the remote desktop window, press Ctrl+V.

Unlike personal computer remote server(also called a virtual server or VDS) works constantly. For this reason, it is very convenient to keep the Quik trading terminal and the TradeHelp robot in working condition there.

With COM, the client doesn't have to worry about where the object is located, it just makes a call to the interface of this object. COM technology provides all the necessary steps to make this call. The steps may vary depending on the location of the item. The object can be in the same process as the client, in a different process on the same computer as the client, or on another computer on the network. Depending on this, they apply different types servers:

1. internal server (In-process server);

2. local server or out-of-process server (Local server, Out-of-process server);

3. Remote server.

Internal server - This DLL, which is running in the same process along with the client. For example, element ActiveX controls, which is embedded in a Web page and viewed using Internet Explorer or Netscape Navigator. IN in this case ActiveX control loaded on client machine and is in the same process as Web browser. The client application communicates with the server within the process using direct calls to the COM interface. In Fig. 13.2. a diagram of interaction between the client and the internal server is presented.

Figure 13.2 - Scheme of client interaction with the internal server

The internal COM server must export four functions:

function DllRegisterServer: HResult; stdcall;

function DllUnregisterServer: HResult; stdcall;

function DllGetClassObject (const CLSID, IID: TGUID; var Obj): HResult;

function DllCanUnloadNow: HResult; stdcall;

All of the above functions are already implemented in the comserv module, you just need to add them to the exports descriptions of your project.

Let's look at these functions in more detail:

1. DllRegisterServer - used for DLL registration COM server in system registry Windows. When registering a COM class in the system registry, a section is created in HKEY_CZASSES_ROOTCLSID(XXXXXXXX-XXXX-XXXX-xxxx-xxxxxxxx), where the number written instead of the x characters is the CLSID of this COM class. For internal server V this section an additional subkey inProcserver32 is created. This subsection specifies the path to the internal server DLL (Fig. 3.4).

2. DllUnregisterServer - used to delete all sections, subsections and parameters that were created in the system registry by the DllRegisterServer function when registering the COM server DLL.

3. DllGetclassObject - returns the class factory for a specific COM class.

4. DllcanUnloadNow - used to determine whether it is possible to currently time to unload the COM server DLL from memory. The function checks whether there are pointers to any COM object of this DLL; if there are, it returns the value S_FALSE, i.e. the DLL cannot be unloaded. If no COM object of this DLL is used, then the function returns the value SJTRUE.

Figure 13.3 -Path to the local COM server in the system registry editor window

Local server - This is an EXE application that runs in a different process, but on the same computer as the client. For example, sheet spreadsheet Microsoft Excel linked to a document Microsoft Word. Moreover, two different applications work on the same computer. Local servers use COM to connect to the client.

When the client and server are in various applications, and also when they are on different computers on the network, COM uses internal (in-process) proxy(In-process proxy) to implement the procedure remote call. The proxy is located in the same process with the client, therefore, from the client's point of view, calling interfaces is carried out in the same way as in the case when the client and server are inside the same process. The proxy's task is to intercept client calls and redirect them to where the server is running. The mechanism that allows a client to access objects located in a different address space or on a different computer is called. marshaling(marshaling).

Marshalling functions:

1. accept an interface pointer from the server process and make the proxy pointer available in the client process;

2. pass arguments to interface calls as if they originated from the client and post the arguments to the remote object process.

For any interface call, the client pushes arguments onto the stack, calls required function COM object via an interface pointer. If the object is called outside of a process, the call goes through a proxy. The proxy packs the arguments into marshaling package and passes the resulting structure to the remote object. Stub(stub) of the object unpacks the marshaling package, selects arguments from the stack and calls the necessary function of the COM object.

Thus, marshaling is the process of packing information, and unmarshaling is the process of unpacking information.

The type of marshaling depends on the COM object ownership. Objects can use the standard marshaling mechanism provided by the IDispatch interface. Standard Marshalling allows you to establish communication using a standard system remote procedure call(Remote Procedure Call, RFC).

In Fig. Figure 13.4 shows a diagram showing the method of interaction between client and server in the case where applications run on the same computer, but in different applications.

Figure 13.4 - Scheme of client-server interaction in different processes on the same computer

The local COM server is registered in the system Windows registry the same as the internal COM server.

Remote server - it is a DLL or other application running on another computer. That is, the client and server run on different computers on the network. For example, a database application written in Delphi connects to a server on another computer on the network. The remote server uses distributed COM interfaces(Distributed COM, DCOM) for communication with the client.

The remote server also works using a proxy. The difference in operation between a local and a remote server is the type of interprocess communication used. In the case of a local server, this is COM, and in the case of a remote server, it is DCOM. The interaction diagram between the client and the remote server is shown in Fig. 13.5.

Figure 13.5 - Scheme of client-server interaction on different computers

COM clients

It is very important when developing COM applications to create applications called COM clients that can query object interfaces to determine the services that a COM object can provide.

A typical COM client is the Automation Controller. Automation Manager - this is the part of the application that knows what type of information it needs from various server objects, and it requests this information as needed.

COM extensions

COM technology was initially developed as a core for interprogram interaction. Already at the development stage, it was planned to expand the capabilities of the technology using so-called COM extensions. COM expands its own functionality by creating specialized sets of interfaces to solve specific problems.

ActiveX technology is a technology that uses COM components, especially controls. It was created to make working with controls more efficient. This is especially necessary when working with Internet/Intranet applications where controls must be downloaded to the client computer before they can be used.

ActiveX technology is not the only COM extension. In table Figure 3.2 presents some of the COM extensions currently in use.

Listed in table. 13.1 COM extensions are not all of those available. Old ones are constantly being refined and new, more advanced technologies for inter-program interaction are being created.

Table 13.1 - List of COM extensions

In Fig. Figure 13.6 is a diagram that shows the relationship of some COM extensions and their relationship to COM technology.

Using COM objects has both advantages and some limitations. COM objects can be either visual or non-visual. Some COM objects must be launched in the same process with the client, others - in different processes or on different computers.

The table below Section 13.2 briefly describes the object features of each of the above COM extensions.

Figure 13.6 - Technologies based on COM

Table 13.2 -Features of COM objects

To create a remote server, you first need to change the operating system and firewall settings to make it possible to query the ports that will be used by the remote server.

Instructions

Go to the Start button menu and select Run. To create a remote server, you need to configure remote connections so that they are resolved and recorded in the database server and reports. IN command line enter the following: Microsoft SQL Server 2008 R2.

In the window that appears, open the “Customization Tools” tab. In it, go to the “Configuration Manager” section server and SQL". After that, find the “Network Configuration” node server and SQL". Unfold it double click left mouse button.

Select "Protocols" to make a remote server. In it, enable the TCP/IP protocol. Restart services server and SQL so that installed settings came into force. Go to the Start button menu. Now you need to activate remote administration in your system's firewall.

Select "Run". In the command line, enter the following: netsh.exe firewall set service type=REMOTEADMIN mode=Enable scope=ALL and click Enter key. Go to the Start button menu again.

Select "Control Panel". This time you need to configure the DCOM resolution for remote access to WMI utilities. Double-click on “Administration”. In the window that opens, go to the “Component Services” tab.

Find the “Computers” node, expand it, select “My Computer”. In the "Actions" section, find the "Properties" tab. To set up remote server Select "COM Security" and then click the "Edit Restrictions" button in the "Launch and Activation Permissions" section.

Enter your username and click OK. Expand the User or Group Permissions node. Check the boxes next to “Remote activation” and “Remote access”. Click OK. Then change WMI settings server A. Return to Computer Management in the Administrative Tools section.

Open the Security tab. Expand the folders there, then highlight the Admin folder and click the “Security” button again. Activate the items: “Enable account”, “Enable remotely”, “Read security”. Click OK.

Many people have heard about the operation of remote servers, but would like to learn more about it. So, what is a remote business server and how does it work? There is a special shortcut on the desktop of your monitor that is used to connect to the remote service. In the final version, all work related to by email, documents and software products 1C must be performed on a remote server.

Otherwise, everything remains the same, and there is no need to train staff to work with a remote server, which is what customers are so afraid of. You can work with almost all programs, the only exceptions are complex systems, designed for design and graphics editors.

The list of the most popular programs included in the dedicated server consists of:
- 1C accounting latest versions;
- package Microsoft Office 2010 with Excel, Word, Access, Outlook;
- Thunderbird;
- Google Chrome;
- virtual printer.

You can easily print documents from a remote server using laser printer, and for this it is not necessary to install it directly on the computer. The only thing you need to check is that the printer supports the terminal server. You can also exchange information between local network and terminal. But it must be remembered that the exchange will occur somewhat differently. ArtexTelecom can provide its customers with special access with a data encryption algorithm and show options for customization yourself.

Long-term server rental allows you to save on the purchase of licensed software, as well as reduce the cost of updating and maintaining it. Special place for Reserve copy information is provided within the framework of the concluded contract, and the size of the storage depends on your needs. If necessary, you can always purchase or rent extra bed for storage.

The cost of a standard server rental includes:
- placement in a specialized data center;
- a package of selected software with all necessary licenses;
- assistance with installations and settings;
- selection of 1C accounting programs with subsequent updates.

The main advantage of a remote server is its security. Your data, accounting information and all documentation will be guaranteed to be protected from hacking, equipment breakdown, unlawful confiscation and other risks.

Renting a remote server is an option that company management should definitely consider to improve the efficiency of the entire system.

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