Кaтегория: Teamviewer distributor

Www citrix com xenserver

www citrix com xenserver

Citrix XenServer Development · 1. Download and setup XenServer · 2. Setup XenCenter and Visual Studio C# · 3. Download and Install Xen SDK VM · 4. Citrix XenServer und OSS Xen. Best of both worlds. Frank ‚XenGelist' Kohler. [email protected] SE Manager Server Virtualization CE. Citrix® XenServer® is a complete, managed server virtualization platform and is widely acknowledged as the fastest and most secure virtualization software. DBEAVER NETEZZA

Citrix XenServer. Techopedia Explains Citrix XenServer. Citirix XenServer is a hypervisor platform that enables the creation and management of virtualized server infrastructure. It is developed by Citrix Systems and is built over the Xen virtual machine hypervisor.

XenServer provides server virtualization and monitoring services. It is available in a bit hypervisor platform and can be executed on the entire x86 series of processors. Techopedia Explains Citrix XenServer Cirtix XenServer is among the virtualization solutions provided by Citrix Systems, which consolidates a physical server's computing power into multiple virtual machines, all emulating as a standard server.

Citrix XenServer is built to provide the operational requirements of a standard server and supports most server operating systems, such as Linux and Windows Server, on guest server machines. Through its virtual machine monitoring component, Citrix XenServer manages the allocation and distribution of physical server computing resources among virtual machines and administers their performance and use.

Share this Term. Hypervisor Xen Hypervisor. Tech moves fast! Stay ahead of the curve with Techopedia! Assuming the authentication succeeds, the server will create a "session" object and return a reference to the client. This reference will be passed as an argument to all future API calls. Once authenticated, the client may search for references to other useful objects e. XenServer Hosts, VMs, etc.

Operations may be invoked either synchronously or asynchronously; special task objects represent the state and progress of asynchronous operations. These application elements are all described in detail in the following sections. Because the master host of a pool can change, especially if HA is enabled on a pool, clients must implement the following steps to detect a master host change and connect to the new master as required:.

Subscribe to updates in the list of hosts servers, and maintain a current list of hosts in the pool. If the connection to the pool master fails to respond, attempt to connect to all hosts in the list until one responds. As a special-case, all messages sent through the Unix domain socket are transparently forwarded to the correct node.

As a special-case, if this call is executed over the local Unix domain socket then the username and password are ignored and the call always succeeds. Every session has an associated "last active" timestamp which is updated on every API call. The server software currently has a built-in limit of active sessions and will remove those with the oldest "last active" field if this limit is exceeded for a given username or originator. In addition all sessions whose "last active" field is older than 24 hours are also removed.

Therefore it is important to:. In the following Python fragment a connection is established over the Unix domain socket and a session is created:. Once an application has authenticated the next step is to acquire references to objects in order to query their state or invoke operations on them. All objects have a set of "implicit" messages which include the following:.

In addition to the methods of finding objects described above, most objects also contain references to other objects within fields. For example it is possible to find the set of VMs running on a particular host by calling:. Once object references have been acquired, operations may be invoked on them. For example to start a VM:.

All API calls are by default synchronous and will not return until the operation has completed or failed. For example in the case of VM. When the VM. To simplify managing operations which take quite a long time e. Each asynchronous function returns a reference to a task object which contains information about the in-progress operation including:. An application which wanted to track the progress of a VM. A well-behaved client should remember to delete tasks created by asynchronous operations when it has finished reading the result or error.

If the number of tasks exceeds a built- in threshold then the server will delete the oldest of the completed tasks. With the exception of the task and metrics classes, whenever an object is modified the server generates an event. Clients can subscribe to this event stream on a per-class basis and receive updates rather than resorting to frequent polling. Events come in three types:. Clients register for events by calling event. Clients receive events by executing event.

Clients should be prepared to handle this by re-registering for events and checking that the condition they are waiting for hasn't become true while they were unregistered. GetVariousRecords: logs into a XenServer Host and displays information about hosts, storage and virtual machines;. Requires a shut-down VM to be already installed.

On Windows, the xe. The CLI allows almost every API call to be directly invoked from a script or other program, silently taking care of the required session management. For additional resources and examples, visit the Citrix Knowledge Center. The example makes use of asynchronous API calls and shows how to wait for a set of tasks to complete. Next the commandline arguments containing a server URL, username, password and a number of iterations are parsed.

The username and password are used to establish a session which is passed to the function main, which is called multiple times in a loop. Note the use of try: finally: to make sure the program logs out of its session at the end. The main function examines each running VM in the system, taking care to filter out control domains which are part of the system and not controllable by the user. A list of running VMs and their current hosts is constructed.

Each VM is then moved using XenMotion to the new host under this rotation i. In order to execute each of the movements in parallel, the asynchronous version of the VM. Note the live flag passed to the VM. Once all tasks have left the pending state i. If any one of the tasks failed then details are printed, an exception is raised and the task objects left around for further inspection. If all tasks succeeded then the task objects are destroyed and the function returns. The example begins with some boilerplate which first checks if the environment variable XE has been set: if it has it assumes that it points to the full path of the CLI, else it is assumed that the XE CLI is on the current path.

Next the script prompts the user for a server name, username and password:. Next the script checks its commandline arguments. The script then checks the power state of the VM and if it is running, it attempts a clean shutdown. The event system is used to wait for the VM to enter state "Halted".

The XE CLI supports a command-line argument --minimal which causes it to print its output without excess whitespace or formatting, ideal for use from scripts. If multiple values are returned they are comma-separated. Finally, if the original VM had been running and was shutdown, both it and the new VM are started.

This chapter describes the available mechanisms. Because the import and export of VMs can take some time to complete, an asynchronous HTTP interface to the import and export operations is provided. XenServer records statistics about the performance of various aspects of your XenServer installation.

The metrics are stored persistently for long term access and analysis of historical trends. Where storage is available to a VM, the statistics are written to disk when a VM is shut down. The RRDs are also backed up every day.

These methods has been deprecated in favor of using the http handler described in this chapter to download the statistics from the RRDs on the VMs and servers. Note that by default the legacy metrics will return zeroes. By default, the older metrics APIs will not return any values, and so this key must be enabled to run monitoring clients which use the legacy monitoring protocol.

Statistics are persisted for a maximum of one year, and are stored at different granularities. The average and most recent values are stored at intervals of:. If statistics cannot be written to disk, for example when a disk is full, statistics will be lost and the last saved version of the RRD will be used.

HTTP authentication can take the form of a username and password or a session token. Parameters are appended to the URL following a question mark? This request returns data in an rrdtool xport style XML format, for every VM resident on the particular host that is being queried.

The step will decrease as the period decreases, which means that if you request statistics for a shorter time period you will get more detailed statistics. Note By default only ave statistics are available. The XenAPI is a general and comprehensive interface to managing the life-cycles of Virtual Machines, and offers a lot of flexibility in the way that XenAPI providers may implement specific functionality e.

XenServer has several extensions which provide useful functionality used in our own XenCenter interface. The workings of these mechanisms are described in this chapter. Extensions to the XenAPI are often provided by specifying other-config map keys to various objects.

The use of this parameter indicates that the functionality is supported for that particular release of XenServer, but not as a long-term feature. We are constantly evaluating promoting functionality into the API, but this requires the nature of the interface to be well-understood. Developer feedback as to how you are using some of these extensions is always welcome to help us make these decisions. Most XenAPI graphical interfaces will want to gain access to the VM consoles, in order to render them to the user as if they were physical machines.

There are several types of consoles available, depending on the type of guest or if the physical host console is being accessed:. There is no text-based console, and guest networking is not necessary to use the graphical console. Paravirtual VMs, such as Linux guests, provide a native text console directly. XenServer provides a utility called vncterm to convert this text-based console into a graphical VNC representation.

Guest networking is not necessary for this console to function. As with Windows above, Linux distributions often configure VNC within the guest, and directly connect to it over a guest network interface. The physical host console is only available as a vt console, which is exposed through the XenAPI as a VNC console by using vncterm in the control domain. Third-party developers are expected to provide their own VNC viewers, and many freely available implementations can be adapted for this purpose.

RFB 3. The sequence of API calls is as follows:. Returns a URI describing where the requested console is located. This scheme requires direct access from the client to the control domain's IP, and will not work correctly if there are Network Address Translation NAT devices blocking such connectivity. When creating and destroying Linux VMs, the host agent automatically manages the vncterm processes which convert the text console into VNC. The text console can then only be accessed directly from the control domain directly, and graphical interfaces such as XenCenter will not be able to render a console for that VM.

Instead, connect to the guest over SSH or some other network-based connection mechanism. The installation of paravirtual Linux guests is complicated by the fact that a Xen-aware kernel must be booted, rather than simply installing the guest using hardware-assistance. This does have the benefit of providing near-native installation speed due to the lack of emulation overhead.

XenServer supports the installation of several different Linux distributions, and abstracts this process as much as possible. To this end, a special bootloader known as eliloader is present in the control domain which reads various other-config keys in the VM record at start time and performs distribution-specific installation behavior. Path to a repository; 'http', 'https', 'ftp', or 'nfs'. Should be specified as would be used by the target installer, but not including prefixes, e.

The VNC password to use, when providing one is possible using the command-line of the target distribution. The current bootloader round. Not to be edited by the user see below. Then, on the second boot, it removes the additional updates disk from the VM, switches the bootloader to pygrub, and then begins a normal boot.

This sequence is required since Red Hat does not provide a Xen kernel for these distributions, and so the XenServer custom kernels for those distributions are used instead. Similar to the RHEL4. Note that pygrub is not executed immediately, and so will only be parsed on the next boot. The network retrieval enables users to install the upstream Red Hat vendor kernel directly from their network repository. An updated XenServer kernel is also provided on the xs-tools.

This requires a two-round boot process. The first round downloads the kernel and ramdisk from the network repository and boots them. The second round then inspects the disks to find the installed kernel and ramdisk, and sets the PV-bootloader-args to reflect these paths within the guest filesystem. Finally, the bootloader is set to pygrub and is executed to begin a normal boot. The SLES 10 installation method means that the path for the kernel and ramdisk is stored in the VM record rather than in the guest menu.

The CentOS installation mechanism is similar to that of the Red Hat installation notes above, save that some MD5 checksums are different which eliloader recognizes. Developers may wish to install guest agents into VMs which take special action based on the type of the VM.

In order to communicate this information into the guest, a special Xenstore name-space known as vm-data is available which is populated at VM creation time. It is populated from the xenstore-data map in the VM record. Note Only prefixes beginning with vm-data are permitted, and anything not in this name-space will be silently ignored when starting the VM.

The control domain in XenServer 7. Developers should never notice any loss of correct functionality as a result of these changes, but they are documented here as variations of behavior from other distributions. The socket interface, xenstored, access using libxenstore.

Some privileged commands are naturally hard to restrict e. A restricted handle cannot later be granted more privilege, and so the interface must be closed and re-opened. Security is only gained if the process cannot subsequently open more handles. The control domain privileged user-space interfaces can now be restricted to only work for certain domains.

There are three interfaces affected by this change:. The qemu device emulation processes and vncterm terminal emulation processes run as a non-root user ID and are restricted into an empty directory. They uses the restriction API above to drop privileges where possible. Access to xenstore is rate-limited to prevent malicious guests from causing a denial of service on the control domain. This is implemented as a token bucket with a restricted fill-rate, where most operations take one token and opening a transaction takes The limits are set high enough that they should never be hit when running even a large number of concurrent guests under loaded operation.

The VNC guest consoles are bound only to the localhost interface, so that they are not exposed externally even if the control domain packet filter is disabled by user intervention. Virtual and physical network interfaces have some advanced settings that can be configured using the other-config map parameter.

There is a set of custom ethtool settings and some miscellaneous settings. Developers might wish to configure custom ethtool settings for physical and virtual network interfaces. This is accomplished with ethtool- keys in the other-config map parameter. You can override the default maximum transmission unit of a physical or virtual NIC with the mtu key in the other-config map parameter.

Note that changing the MTU of underlying interfaces is an advanced and experimental feature, and may lead to unexpected side-effects if you have varying MTUs across NICs in a single resource pool. If XenCenter sees a record where SR.

In other words, XenCenter will disregard the current contents of that field, and instead use a value appropriate to the user's own language. If you change SR. Therefore, XenCenter does not apply internationalization, and instead preserves your given name. This capability is intended for ISVs who know what they are doing, not general use by everyday users.

For example, you might want to hide certain VMs because they are cloned VMs that shouldn't be used directly by general users in your environment. The following section details the assumptions and API extensions that we have made, over and above the documented API. Extensions are encoded as particular key-value pairs in dictionaries such as VM.

Developer Documentation. Index Citrix XenServer 7. Note We recommend strongly against using the VM. Note The provision operation may take a few minutes, as it is as during this call that the template's disk images are created. Note Some SR types might round up the virtual-size value to make it divisible by a configured block size. In future this will be autodetected. In future booting shall only use pygrub.

Note As a special-case, all messages sent through the Unix domain socket are transparently forwarded to the correct node. Note As a special-case, if this call is executed over the local Unix domain socket then the username and password are ignored and the call always succeeds. Note When the VM. Note A well-behaved client should remember to delete tasks created by asynchronous operations when it has finished reading the result or error. Failure, e: if e. Session url session.

Note The XE CLI supports a command-line argument --minimal which causes it to print its output without excess whitespace or formatting, ideal for use from scripts. If the VM state was running before cloning, we start it again along with the new VM. Warning If statistics cannot be written to disk, for example when a disk is full, statistics will be lost and the last saved version of the RRD will be used.

Use command-line utilities like ping to test connectivity to the IP address provided in the location field. In the previous section we saw how the VM class is used to represent both templates and regular VMs. A host object represents a physical host in a XenServer pool.

Www citrix com xenserver fortinet utm ips

Следующая статья twitter fortinet battleroyale

Другие материалы по теме

  • Download paint tool sai full crack vn zoom
  • Splashtop enter command not working
  • How to get filezilla without other software
  • Manageengine wireless
  • Winscp compare
  • Fortinet cli ping
  • 4 комментариев

    1. Dizahn :

      wikipedia paragon software for mac

    2. Zolocage :

      ultravnc viewer the server running as application

    3. Faushakar :

      fortinet bronze partner logo

    4. Goltim :

      descargar splashtop 2

    Добавить комментарий

    Ваш e-mail не будет опубликован. Обязательные поля помечены *