CN107368353B - Method and device for realizing hot addition of virtual machine memory - Google Patents
Method and device for realizing hot addition of virtual machine memory Download PDFInfo
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- 238000010586 diagram Methods 0.000 description 5
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- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
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- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
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- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
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Abstract
The embodiment of the invention discloses a method and a device for realizing hot addition of memory in a virtual machine, wherein the method comprises the following steps: performing hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine. The embodiment of the invention can effectively increase the application scenes of the virtual machine migration function and reduce the migration limitation.
Description
Technical Field
The present invention relates to a virtual machine technology, and in particular, to a method and an apparatus for implementing hot add in a virtual machine.
Background
The traditional server needs to be upgraded and configured and is always required to be stopped; in a virtualized environment, it is technically and operationally easier to implement online upgrade configuration, so that a client can still ensure the availability of services when the server load exceeds the predicted upgrade configuration. The Linux kernel already realizes the support of hot plug of the memory, and when a Linux system runs in a physical environment or a virtual environment, the Linux kernel can correspondingly increase or reduce the memory as long as a host can provide a hot plug mechanism of the memory. By combining the technology of the memory of the open source simulator qemu and the hot plug of the CPU, the online system upgrading without interrupting the service under the production environment can be realized. If an Application Programming Interface (API) provided by the open source simulator qemu is directly called to perform memory hot plug, the C function library libvirt cannot perceive each addition, and cannot snapshot and migrate a Virtual Machine (VM).
Disclosure of Invention
In order to solve the foregoing technical problem, embodiments of the present invention provide a method and an apparatus for implementing hot add in a virtual machine, which may be implemented.
In order to achieve the object of the present invention, in one aspect, an embodiment of the present invention provides a method for implementing hot add of virtual machine memory, including:
performing hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine.
Compared with the prior art, the embodiment of the invention carries out the hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine. The embodiment of the invention can effectively increase the application scenes of the virtual machine migration function and reduce the migration limitation.
Further, the virtual machine is created using an open source simulator qemu;
the virtual machine manager is a virtualization tool libvirt.
Further, the performing of hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine includes:
acquiring non-uniform memory access numa node topology information of the virtual machine;
if only one numa node is found in the virtual machine according to the numa node topology information, directly adding hot memory; and if the fact that the number of the numa nodes exists in the virtual machine is known according to the numa node topology information, acquiring the numa node with the minimum memory, and performing memory hot adding on the numa node with the minimum memory.
Further, the updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager includes:
managing the virtual machine by calling a kernel-based kvm virtualization interface;
and updating the memory information in the extensible markup language XML by modifying the libvirt source code of the virtualization tool.
Further, the performing the virtual machine memory hot addition comprises:
the Libvirt sends a memory hot addition event to qemu through a socket;
the qemu executes memory hot adding according to the memory hot adding event;
after the performing the memory hot addition, the method further comprises:
if the execution of the memory hot addition fails, returning a processing result through libvirt; and if the execution of the memory hot addition is successful, updating the memory information in the XML of the virtual machine.
On the other hand, an embodiment of the present invention further provides an apparatus for implementing hot add in virtual machine, including:
the management module is used for performing hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine.
Further, the apparatus further comprises:
the virtual machine is created using an open source simulator qemu;
the virtual machine manager is a virtualization tool libvirt.
Further, the apparatus further comprises:
the acquiring module is used for acquiring non-uniform memory access numa node topology information of the virtual machine;
the execution module is used for directly performing memory hot addition if only one numa node is known in the virtual machine according to the numa node topology information; and if the fact that the number of the numa nodes exists in the virtual machine is known according to the numa node topology information, acquiring the numa node with the minimum memory, and performing memory hot adding on the numa node with the minimum memory.
Further, the management module is further configured to:
managing the virtual machine by calling a kernel-based kvm virtualization interface;
and updating the memory information in the extensible markup language XML by modifying the libvirt source code of the virtualization tool.
Further, the management module is further configured to:
the Libvirt sends a memory hot addition event to qemu through a socket;
the qemu executes memory hot adding according to the memory hot adding event;
after the performing the memory hot addition, the method further comprises:
if the execution of the memory hot addition fails, returning a processing result through libvirt; and if the execution of the memory hot addition is successful, updating the memory information in the XML of the virtual machine.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flowchart of a method for implementing hot add to virtual machine memory according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a method for implementing hot add of virtual machine memory according to an embodiment of the present invention;
fig. 3 is a block diagram of an apparatus for implementing hot add of virtual machine memory according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
As shown in fig. 1, it is a flowchart of a method for implementing hot add to virtual machine memory according to an embodiment of the present invention, where the embodiment includes the following steps:
step 100: performing hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine;
step 101: after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine.
Specifically, the embodiment of the invention relates to a method for realizing hot addition of a virtual machine memory, supporting migration and snapshot based on a qemu and libvirt virtualization product. Calling an API provided by an open source simulator qemu to perform memory hot plug, and calling an API of libvirt to perform hot plug each time when snapshotting and migrating the virtual machine VM are performed. The memory hot plug is performed, and the C function library libvirt is to be embodied in an eXtensible Markup Language (XML) to sense each addition.
In general, the virtual machines in qemu are created by Libvirt, and to support memory hot plug, a maximum storage maxMemory configuration needs to be specified when the virtual machines are created, and at least one non-uniform memory access (numa) node needs to be specified, wherein the numa node is a numa node in the virtual machine and is not a node in a host. When there are multiple numa nodes and memory hot-plugging is performed, the problem of adding memory to which node and how to keep the memory size consistent among nodes is involved.
In the embodiment of the invention, libvirt is adopted to update the memory and currentmemory in the XML after the memory hot plug is executed, so that the information stored in the database is consistent with the real memory size of the VM.
The embodiment of the invention adopts C language to realize the method for adding the hot memory in the virtual machine, the open source simulator qemu is used for creating the virtual machine, the libvirt is used for calling the kvm virtualization interface to manage the virtual machine, and the memory information in the XML is updated by modifying the libvirt source code, so that the consistency of the XML data of the virtual machine stored in the processes of the libvirt and the qemu after the hot memory is added and the balance of the memory size among the node nodes in the VM are ensured.
The Kernel-based Virtual Machine (KVM) is a full-function virtualization solution on the x86 hardware platform under Linux.
The virtual machine manager is a virtualization tool libvirt. libvirt is a free and open-source C function library supporting mainstream virtualization tools in Linux and aims to provide a convenient and reliable programming interface for various virtual machine monitoring programs such as qemu.
The method of the embodiment of the invention improves the hot memory adding function, can effectively increase the use scene of the virtual machine migration function, and reduces the migration limitation, and meanwhile, the mode can be modified through the software part, thereby facilitating the upgrading and maintenance of the later-stage virtualization product.
According to the embodiment of the invention, the hot addition of the memory of the virtual machine is carried out according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine. The embodiment of the invention can effectively increase the application scenes of the virtual machine migration function and reduce the migration limitation.
The method of the embodiment of the invention is implemented as follows: and modifying libvirt source codes to update memory information in the XML, so as to ensure the consistency of XML data of the virtual machine stored in libvirt and qemu processes and the balance of memory sizes among node nodes in the VM after hot addition of the memory.
Further, performing virtual machine memory hot addition according to the memory size of each node in the virtual machine includes:
acquiring non-uniform memory access numa node topology information of the virtual machine;
if only one numa node is found in the virtual machine according to the numa node topology information, directly adding hot memory; and if the fact that the number of the numa nodes exists in the virtual machine is known according to the numa node topology information, acquiring the numa node with the minimum memory, and performing memory hot adding on the numa node with the minimum memory.
Further, the updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager includes:
managing the virtual machine by calling a kernel-based kvm virtualization interface;
and updating the memory information in the extensible markup language XML by modifying the libvirt source code of the virtualization tool.
Further, the performing the virtual machine memory hot addition comprises:
the Libvirt sends a memory hot addition event to qemu through a socket;
the qemu executes memory hot adding according to the memory hot adding event;
after the performing the memory hot addition, the method further comprises:
if the execution of the memory hot addition fails, returning a processing result through libvirt; and if the execution of the memory hot addition is successful, updating the memory information in the XML of the virtual machine.
Fig. 2 is a schematic diagram of a method for implementing hot add of virtual machine memory according to an embodiment of the present invention, as shown in fig. 2:
specifically, the code implementation mainly comprises the following steps:
step 201: acquiring numa topology information of the virtual machine, and directly performing memory hot addition if only one numa node exists; and if a plurality of nodes exist, taking out the node with the smallest memory, and performing memory hot addition on the node.
Step 202: the Libvirt sends a memory hot plug event to qemu through a socket, the qemu executes memory hot addition, and if the execution fails, the step is directly skipped to the step 204; if successful, the process continues with step 203.
Step 203: and updating the memory information in the xml of the virtual machine, wherein the memory after the memory hot plug is the memory before the memory hot plug and the memory of the memory hot plug.
Step 204: libvirt returns the processing result.
The embodiment of the invention provides a method for realizing hot addition of a virtual machine memory based on libvirt, and simultaneously supports migration and snapshot. By modifying the libvirt source code, the memory information in the XML is updated after the memory is successfully added each time, the information of the database and the VM is kept consistent, and the snapshot and the migration of the virtual machine after the hot plug of the memory are realized. By re-developing the libvirt source code, the memory hot plug function is further improved, and the competitiveness of a virtualized product is improved. By the aid of the reasonably designed hot memory adding method, original functions are not affected, the hot memory adding function is further improved according to new requirements, and application scenarios of the virtual machine migration function are increased.
Fig. 3 is a structural diagram of an apparatus for implementing hot-add in virtual machine according to an embodiment of the present invention, and as shown in fig. 3, an apparatus for implementing hot-add in virtual machine according to another aspect of the embodiment of the present invention includes:
the management module 300 is configured to perform hot addition of virtual machine memory according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine.
Further, the apparatus further comprises:
the virtual machine is created using an open source simulator qemu;
the virtual machine manager is a virtualization tool libvirt.
Further, the apparatus further comprises:
an obtaining module 301, configured to obtain non-uniform memory access numa node topology information of the virtual machine;
an execution module 302, configured to directly perform hot memory addition if it is known that there is only one numa node in the virtual machine according to the numa node topology information; and if the fact that the number of the numa nodes exists in the virtual machine is known according to the numa node topology information, acquiring the numa node with the minimum memory, and performing memory hot adding on the numa node with the minimum memory.
Further, the management module 300 is further configured to:
managing the virtual machine by calling a kernel-based kvm virtualization interface;
and updating the memory information in the extensible markup language XML by modifying the libvirt source code of the virtualization tool.
Further, the management module 300 is further configured to:
the Libvirt sends a memory hot addition event to qemu through a socket;
the qemu executes memory hot adding according to the memory hot adding event;
after the performing the memory hot addition, the method further comprises:
if the execution of the memory hot addition fails, returning a processing result through libvirt; and if the execution of the memory hot addition is successful, updating the memory information in the XML of the virtual machine.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for implementing hot add of virtual machine memory, comprising:
performing hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine.
2. The method of claim 1,
the virtual machine is created using an open source simulator qemu;
the virtual machine manager is a virtualization tool libvirt.
3. The method according to claim 2, wherein the performing virtual machine memory hot addition according to the memory size of each node in the virtual machine includes:
acquiring non-uniform memory access numa node topology information of the virtual machine;
if only one numa node is found in the virtual machine according to the numa node topology information, directly adding hot memory; and if the fact that the number of the numa nodes exists in the virtual machine is known according to the numa node topology information, acquiring the numa node with the minimum memory, and performing memory hot adding on the numa node with the minimum memory.
4. The method according to claim 3, wherein the updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager comprises:
managing the virtual machine by calling a kernel-based kvm virtualization interface;
and updating the memory information in the extensible markup language XML by modifying the libvirt source code of the virtualization tool.
5. The method according to claim 4, wherein said performing virtual machine presence hot addition comprises:
the libvirt sends a memory hot adding event to qemu through a socket;
the qemu executes memory hot adding according to the memory hot adding event;
after the performing the memory hot addition, the method further comprises:
if the execution of the memory hot addition fails, returning a processing result through libvirt; and if the execution of the memory hot addition is successful, updating the memory information in the XML of the virtual machine.
6. An apparatus for implementing hot add of virtual machine memory, comprising:
the management module is used for performing hot addition of the memory of the virtual machine according to the memory size of each node in the virtual machine; after the hot addition of the memory of the virtual machine is successful, updating the memory information stored in the database and the current memory information of the virtual machine by modifying the source code of the virtual machine manager so as to keep the memory information stored in the database consistent with the current memory information of the virtual machine.
7. The apparatus of claim 6, wherein the apparatus further comprises:
the virtual machine is created using an open source simulator qemu;
the virtual machine manager is a virtualization tool libvirt.
8. The apparatus of claim 7, wherein the apparatus further comprises:
the acquiring module is used for acquiring non-uniform memory access numa node topology information of the virtual machine;
the execution module is used for directly performing memory hot addition if only one numa node is known in the virtual machine according to the numa node topology information; and if the fact that the number of the numa nodes exists in the virtual machine is known according to the numa node topology information, acquiring the numa node with the minimum memory, and performing memory hot adding on the numa node with the minimum memory.
9. The apparatus for implementing hot add in virtual machine according to claim 8, wherein the management module is further configured to:
managing the virtual machine by calling a kernel-based kvm virtualization interface;
and updating the memory information in the extensible markup language XML by modifying the libvirt source code of the virtualization tool.
10. The apparatus for implementing hot add in virtual machine according to claim 9, wherein the management module is further configured to:
the libvirt sends a memory hot adding event to qemu through a socket;
the qemu executes memory hot adding according to the memory hot adding event;
after the performing the memory hot addition, the method further comprises:
if the execution of the memory hot addition fails, returning a processing result through libvirt; and if the execution of the memory hot addition is successful, updating the memory information in the XML of the virtual machine.
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| CN108196958B (en) * | 2017-12-29 | 2020-09-29 | 北京泽塔云科技股份有限公司 | Resource scheduling and distributing method, computer system and super-fusion architecture system |
| CN110633130B (en) * | 2019-08-29 | 2023-10-31 | 上海仪电（集团）有限公司中央研究院 | Virtual memory management method and device based on memory hot plug technology |
| CN110750336B (en) * | 2019-10-29 | 2022-06-17 | 北京浪潮数据技术有限公司 | OpenStack virtual machine memory hot-expanding method |
| CN111414236A (en) * | 2020-03-23 | 2020-07-14 | 佳讯飞鸿（北京）智能科技研究院有限公司 | Online adjusting method and device for CPU and memory and virtual electronic equipment |
| CN112286638A (en) * | 2020-11-04 | 2021-01-29 | 浪潮云信息技术股份公司 | Method for realizing hot plug between CPU and memory of Openstack virtual machine |
| CN113419811A (en) * | 2021-05-20 | 2021-09-21 | 曙光信息产业股份有限公司 | CPU adding method, device, computer device and readable storage medium |
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