What is virtual hosting. The main types of virtual hosting


What is virtual hosting. The main types of virtual hosting
Опубликовано: 14.12.2021


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New virtual server creation. User actions


You only specify the destination IP with the route domain ID and do not specify the source IP. The source IP address defaults to 0.0.0.0 and inherits the route domain ID from the destination IP address. You provide both source and destination addresses, but you do not specify route domain IDs. The system uses the default route domain. You provide the source and destination addresses and the route domain ID for each of the IP addresses. The system verifies that both routing domain identifiers match. Otherwise, the system displays an error message. You specify both the source and destination addresses and the route domain ID at one of the addresses, but exclude the ID from the other address. The system checks if the specified route domain ID matches the default route domain ID. In particular, when one address lacks an identifier, the only valid configuration is a configuration in which the identifier specified in the other address is the default route domain identifier. Otherwise, the system displays an error message.


Modifying an existing virtual server


In the destination address, you will change the ID of the existing route domain. The system automatically changes the route domain ID at the source address to match the new destination route domain ID. In the original address, you are modifying the existing route domain identifier. If the new route domain ID does not match the route domain ID in the destination address, the system displays an error message stating that the two route domain IDs must match.


To recover from various problems, the Active Directory DC requires regular system state backups. By default, a system state backup has a useful life of 60 or 180 days. It depends on the OS version and the Service Pack version in effect at the time of installation. This useful life is controlled by the lifetime attribute in Active Directory. At least one DC in each domain should be backed up on a regular basis according to the number of days specified in the tombstone lifetime.


The main types of virtual hosting


1 Dedicated hosting


This type of hosting, hosted on a dedicated server, is best suited for large sites with high traffic. In this case, a company wishing to go online leases an entire server from a hosting company. This is suitable for companies hosting larger sites, serving other people websites, or running a large online shopping mall, etc.


2 Default wildcard virtual servers


You can create two types of wildcard virtual servers. Default wildcard virtual servers. The default wildcard virtual server is a wildcard virtual server that uses port 0 and handles traffic for all services. The wildcard virtual server allows traffic from all external VLANs by default. However, you can specifically disable any VLANs that the default wildcard virtual server does not need to support. Disabling VLANs for a wildcard virtual server by default is done by creating a disabled VLAN list. Note that the disabled VLAN list only applies to virtual servers with default wildcards. You cannot create a disabled VLAN list for a wildcard virtual server that is associated with only one VLAN.


3 Wildcard virtual servers for specific ports


The port-specific wildcard virtual server only handles traffic for a specific service, and you define the virtual server using the service name or port number. You can use port-specific wildcard virtual servers to monitor statistics for a specific type of network traffic, or to route outbound traffic such as HTTP traffic directly to a cache server rather than a firewall or router.


If you are using both the default wildcard virtual server and the port-specific wildcard virtual servers, any traffic that does not match either the default wildcard virtual server or any of the wildcard virtual servers for a particular port is handled by the wildcard virtual server by default characters. It is recommended that when defining transparent hosts that need to handle more than one service type, such as a firewall or router, you specify the actual port for the host and disable port translation for the virtual server.


Then you need to decide which class you want your virtual server to belong to. Using classes, you can configure similar virtual servers at the same time, so you do not need to configure each one separately. You can use the default virtual server class, vsclass1, which is automatically generated when you install the server, or you can add a new class.


As we all know, Apache is a very powerful, very flexible and customizable web server for the Nix OS. Here in this tutorial, we are going to discuss another Apache feature that allows us to host more than one website on a single Linux machine. Implementing shared hosting with Apache server can help you save the costs that you invest in server maintenance and administration.


In the early days, a virtual host was launched with the intention of hosting more than just a website on a single computer: for example, website1.example.com, website2.example.com, etc. It would also mean sharing the resources of the same machine, such as memory and CPU. Resources are allocated and used in a way that maximizes efficiency.


Virtual servers and virtual desktops can in practice achieve the same server virtualization goals for your computer network, although they are not the same thing. Virtual Desktop is a technology that allows different users to run different operating systems on the same computer, work separately from a physical computer, or disconnect connected devices if one of them is lost or stolen.


In general, paravirtualization is safer and faster than full virtualization. With direct interaction with the hypervisor through APIs and drivers, paravirtualization has a reputation for better performance.


Differences between virtual server and virtual machine


Virtual servers and virtual machines are often combined, but there is a difference. Virtual servers are available in a variety of ways, but virtual machines are a type of virtual server that uses full virtualization. Likewise, containers are a type of virtual server that uses OS-level virtualization.


When a virtual machine host takes a snapshot of the virtual machine, the guest OS does not detect the snapshot as a backup. If the host supports the Hyper-V Generation ID, this ID will change when the image is run from a snapshot or replica. By default, the DC will consider itself restored from a backup.


A server without an operating system that is completely controlled by one company will always provide better performance than a virtual server that shares the bandwidth, memory, and processing power of a physical server with other virtual servers. Hardware of non-operating system servers can also be optimized to improve performance, which is not the case for shared public servers. Companies that need to comply with regulations that require physical resource sharing will have to use their own non-operating system servers that do not share resources with other tenants.


There are some risks to consolidation, including resource overexertion or possible shutdown of multiple virtual machines due to physical hardware failure. While the cost savings increase as more virtual machines use the same hardware platform, so does the risk. It might be possible to host hundreds of virtual machines on one piece of hardware, but if the hardware platform fails, it could shutdown tens or hundreds of virtual machines. However, using virtual machine backups or snapshots can help mitigate these risks. Organizations often deploy virtual machines when they want to run multiple applications concurrently that require different operating systems and different processing power. For example, a QA team might want to test multiple web servers and small databases at the same time, or IT professionals might need to use the same server to run graphical gaming software and a customer service database. DevOps may also use virtual machines for continuous integration and delivery operations, or an organization may need an environment to run legacy applications alongside other workloads.


Virtual hosting based on names and IP addresses

Shared hosting based on names and IP addresses can be combined: a server can have multiple IP addresses and serve multiple names for some or all of these IP addresses. This method can be useful when using SSL and TLS with wildcard certificates. For example, if the server operator had two certificates, one for * .example.com and one for * .example.net, the operator could serve foo1.example.com and bar1.example.com from the same IP address, but that would require a separate IP for baz1.example.net.


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