CN104468746A - Method for realizing distributed virtual networks applicable to cloud platform - Google Patents
Method for realizing distributed virtual networks applicable to cloud platform Download PDFInfo
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- CN104468746A CN104468746A CN201410680953.7A CN201410680953A CN104468746A CN 104468746 A CN104468746 A CN 104468746A CN 201410680953 A CN201410680953 A CN 201410680953A CN 104468746 A CN104468746 A CN 104468746A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
Abstract
The invention relates to the technical field of cloud computing management, in particular to a method for distributed virtual networks applicable to a cloud platform. According to the method, any number of physical nodes are selected as network nodes of the cloud platform, and the network nodes establish and provide virtual network service; establishment of the network nodes includes the steps that (1), a virtual switch module is installed and started, and a virtual switch and an intranet network bridge are established; (2), an intranet network card is connected into the intranet network bridge; (3), the virtual switch and the intranet network bridge are connected, and a communication module for the node and other intranet nodes is set; (4), local VLAN ports are added; (5), the multiple virtual networks are established; (6), a virtual route is established; (7), an extranet network bridge is established, and an extranet network card is connected in; (8), a virtual route is established. Single-point failures of centralized network service of the cloud platform can be avoided, load balance of the network service nodes is achieved, the virtual networks can be managed flexibly and conveniently, and the method can be used for realizing the distributed virtual networks.
Description
Technical field
The present invention relates to cloud computing administrative skill field, particularly a kind of distributed virtual network implementation approach being applicable to cloud platform.
Background technology
In virtual cloud platform, much all adopt in single network set of node and provide virtual network service, virtual network generally has two kinds of forms available: bridge joint and host NAT change.Under bridge mode, virtual machine exists as complete network host, and all of the port acquiescence is all exposed on network.Under host NAT translative mode, virtual machine uses the IP address of host, and the port of virtual machine communicates by being mapped to other untapped ports on host.
Under large-scale cloud platform, virtual network all needs unified management, under bridge mode, the network of virtual machine and the network of physical machine are reciprocity, in this case, the unified management of virtual network will by being manually configured physical switches, and said method has following shortcoming:
1, virtual network can not be corresponding well with the network identity in physical switches, easily makes mistakes in operating process;
2, network failure is got rid of more difficult, and when attacking appears in Intranet, all need to start to search attack source at whole network range, the workload of O&M is larger at every turn;
3, between virtual machine, the fineness ratio of Secure isolation is more single, can not protect from the network security of multiple dimension to virtual machine.
Under host NAT translative mode, virtual machine and host share an IP address, can compare strict control, can also have following shortcoming to the communication of virtual machine:
1, each port of virtual machine communication needs to map, inconvenient in management;
2, can only control the virtual machine on single host with isolating, the unified control under whole platform can not be carried out.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of distributed virtual network implementation approach being applicable to cloud platform, the Single Point of Faliure that cloud platform centralized network is served can be avoided, realize the load balancing of network service node, simultaneously also can be flexible carry out virtual network management, more fine-grained Secure isolation be provided.
The technical scheme that the present invention solves the problems of the technologies described above is:
Described method selects any physical node as the network node of cloud platform, and network node creates and provides virtual network service; Described network node implementation procedure mainly comprises the steps:
Step 1: install and start virtual switch module, establishment virtual switch and interior network bridge;
Step 2: network bridge in the access of Intranet network interface card is realized and other node interconnections;
Step 3: connect virtual switch and interior network bridge, arranges this node and other Intranet node communication modules;
Step 4: add native vlan port on virtual switch;
Step 5: create multiple virtual network, access the native vlan port of specifying and start respective DHCP service respectively;
Step 6: create virtual flow-line, be respectively multiple virtual network create interface and by its access of virtual route, realize between virtual network three layers of communication;
Step 7: create outer network bridge, and accessing external network network interface card;
Step 8: create virtual flow-line, the configuration virtual machine realized in virtual network carries out outbound communication.
Described distributed virtual network be multiple virtual network service is operated on multiple physical node, the physical node of each operation virtual network service is as the network of virtual machine within the scope of independently network node control oneself;
Described virtual network refers to the inside private network that in cloud platform, virtual machine uses;
Described virtual network service refers to a dnsmasq service processes, for virtual machine provides DHCP service.
Described virtual switch module refers to open vSwitch software module;
Described virtual switch refer to utilize that open vSwich instrument creates, the virtual bridge being similar to physical switches function is provided;
Described interior network bridge and outer network bridge also refer to the virtual bridge utilizing open vSwitch instrument to create, and wherein, network bridge has accessed Intranet network interface card physical node connecting Intranet, and outer network bridge has then accessed outer net network interface card physical node connecting outer net;
Described Intranet refers to the physical LAN at cloud platform place;
Described outer net refers to Internet.
Between described bridge, connection refers to and utilizes the two ends of peer equipment to add two bridges respectively;
Described peer equipment refers to the virtual network devices such as veth, the patch with two ports.
Described internodal communication module comprises communication connection submodule and flow rule of communication submodule;
Described communication connection submodule arranges between node and is communicated with in which way, can be VLAN pattern, gre tunneling pattern, VXLAN tunnel mode etc.;
Described flow rule of communication submodule arranges the internetwork communication of open flows protocol rule managing virtual.
Described native vlan refers to the vlan labelling technique communicating used on this node virtual switch, in order to realize the isolation between virtual network, is different from the VLAN of internal lan physical switches.
Described virtual flow-line refers to the virtual network using ip instrument to create, by each virtual network vlan port on virtual switch being accessed three layers of communication that this Microsoft Loopback Adapter space realizes between virtual network;
Three layers of described communication refer to third layer---the communication between network layer in TCP/IP network hierarchy framework, and network interlayer communication is by IP route implementing;
Described virtual machine outbound communication refers to and allows virtual machine to connect internet, realizes and other mainframe network intercommunications on internet.
The beneficial effect of the present invention program is as follows:
1, avoid the Single Point of Faliure problem existing for centralized network node, managed respectively by virtual machine networks all on cloud platform by region, ensureing that a network node breaks down does not affect other network nodes and normally provides services on the Internet;
2, reduce the high capacity of centralized network service node, distributed multiple network node carries out task sharing and realizes load balancing;
3, virtual network convenient management, utilizes this method to realize software defined network, can realize any establishment and the maintenance of virtual network after keeper once completes the configuration of physical network device as required;
4, secure virtual machine isolation fineness ratio is comparatively flexible, both can realize traditional pattern and isolate the virtual machine on separate unit physical node, and also can isolate between virtual network.First can investigate between virtual network when fault occurs, can investigate between physical node after determining virtual network, investigation speed.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described:
Fig. 1 is single network service node realization flow figure of the present invention;
Fig. 2 is single network service node Organization Chart of the present invention.
Embodiment
As shown in the figure, the present invention ensures that in cloud platform local area network (LAN) every platform physical node has two pieces of physical network cards, one piece for connecting Intranet, another block for connecting outer net, each physical node is installed open vSwitch software, supports to create virtual switch and interior network bridge by the iproute software of virtual network.
// iproute is installed
#wget
https：//repos.fedorapeople.org/repos/openstack/openstack-icehouse/epel-6/iproute-2.6.32-130.el6ost.netns.2.x86_64.rpm
#rpm-ivh iproute-2.6.32-130.el6ost.netns.2.x86_64.rpm
// open vSwitch is installed
#rpm-ivh kmod-openvswitch-2.3.0-1.el6.x86_64.rpm
#rpm-ivh openvswitch-2.3.0-1.x86_64.rpm
// create virtual switch and interior network bridge
#ovs-vsctl add-br vSwi tch
#ovs-vsctl add-br br-int
Network bridge in the access of Intranet network interface card is realized and other node interconnections:
ovs-vsctl add-port br-int etho
Create peer equipment connection virtual switch and interior network bridge, peer equipment is here for veth equipment:
#ip link add vSwitch-link type veth peer name br-int-link//establishment vSwitch-link and br-int-link
#ifconfig vSwitch-link up // activation vSwitch-link port
#ifconfig br-int-l ink up // activation br-int-link port
#ovs-vsctl add-port vSwitch vSwitch-link //vSwitch-link receives virtual switch
#ovs-vsctl add-port br-int vethA-2 //br-int-link receives interior network bridge br-int
Virtual switch and interior network bridge select Intranet communication pattern and this node and other Intranet node communication modules are set, here for VLAN pattern, arrange local network node virtual switch vlan5, vlan6 respectively and between physical node data communication vlan1005, vlan1006 be converted to example, it is as follows that rule is set:
Up vlan conversion:
At vSwitch-link mouth, local vlan5 is converted to valn1005
#ovs-ofctl add-flow vSwi tch″hard_timeout＝0，idle_timeout＝0，priority＝3，in_port＝3，dl_vlan＝5，actions＝mod_vlan_vid：1005，normal″
At vSwitch-link mouth, local vlan6 is converted to valn1006
#ovs-ofctl add-flow vSwitch″hard_timeout＝0，idle_timeout＝0，priority＝3，in_port＝3，dl_vlan＝6，actions＝mod vlan vid：1006，normal″
Wherein, in_port represents No. flow of port, checks by ovs-vsctl show vSwitch order; Dl_vlan represents that the vlan before conversion marks.
Descending vlan conversion:
At br-int-link mouth, vlanl005 is converted to local vlan5
#ovs-ofctl add-flow br-int″hard_timeout＝0，idle_timeout＝0，priority＝3，in_port＝2，dl_vlan＝1010，actions＝mod_vlan_vid：5，normal″
At br-int-link mouth, vlan1006 is converted to local vlan6
#ovs-ofctl add-flow br-int″hard_timeout＝0，idle_timeout＝0，priority＝3，in_port＝2，dl_vlan＝1006，actions＝mod_vlan_vid：6，normal″
Set the transformation rule of vlan5 and vlan6, keeper can create two virtual networks provides dhcp to serve, and for the virtual network of vlan5, constructive process is as follows:
// on virtual switch, add local vlan5 port
#ovs-vsctl add-port vSwitch tap5 tag＝5--set interface tap5type＝internal
// create and start the virtual network service of vlan5:
#ovs-vsctl add-port vSwitch tap5 tag＝5--set interface tap5type＝internal
#ip netns add dhcp-5
#ip link set tap5 netns dhcp-5
#ip netns exec dhcp-5 ip addr add 192.168.5.1/24 dev tap5
#ip netns exec dhcp-5 ifconfig tap5 promisc up
#ip netns exec dhcp-5/usr/sbin/dnsmasq--strict-order
--bind-interfaces--conf-fi le＝--domain＝local
--pid-file＝/opt/xm/test.pid--interface tap5--except-interface＝lo
--dhcp-range＝192.168.5.1，static，120s--dhcp-option＝3，192.168.5.254
--dhcp-lease-max＝256--dhcp-hostsfile＝/opt/xm/network.conf
--dhcp-script＝/opt/xm/update2db.py--leasefile-ro
Said process creates and starts the virtual network dhcp service of vlan5, and being provided with its gateway ip is 192.168.5.254, and step that can be same starts the virtual network service of vlan6 and to arrange its gateway ip be 192.168.6.254.Because virtual network stamps different vlan-labels respectively, so double layer network communication is isolation, we by creating virtual flow-line, can realize three-layer network communication.
#ip netns add qrouter-netns//increase virtual router qroute-netns
#ovs-vsctl add-port vSwitch router5 tag＝5--set interface router5type＝internal
#ovs-vsctl add-port vSwitch router6 tag＝6--set interface router6type＝internal
#ip link set router5 netns qrouter-netns // by vlan5 private network access of virtual router
#ip link set router6 netns qrouter-netns // by vlan5 private network access of virtual router
#ip netns exec qrouter-netns ip addr add 192.168.5.254/24 devrouter5
#ip netns exec qrouter-netns ifconfig router5 promisc up
#ip netns exec qrouter-netns ip addr add 192.168.6.254/24 devrouter6
#ip netns exec qrouter-netns ifconfig router6 promisc up
Create virtual router qouter-netns, and respectively private network 192.168.5.0/24 (vlan5) and 192.168.6.0/24 (vlan6) is accessed by port router5 and router6, then IP is set or adds three layer intercommunications that routing rule realizes between two private networks.
The same establishment another one virtual flow-line is used for virtual machine and connects outer net; Create with interior network bridge and equally create outer network bridge, and accessing external network network interface card.Between network router and outer network bridge, connection is set by veth outside, by the virtual network accessing external network router belonging to virtual machine, by NAT Mapping implementation virtual machine together with outer net.
Claims (7)
1. be applicable to a distributed virtual network implementation approach for cloud platform, it is characterized in that: described method selects any physical node as the network node of cloud platform, and network node creates and provides virtual network service; Described network node implementation procedure mainly comprises the steps:
Step 1: install and start virtual switch module, establishment virtual switch and interior network bridge;
Step 2: network bridge in the access of Intranet network interface card is realized and other node interconnections;
Step 3: connect virtual switch and interior network bridge, arranges this node and other Intranet node communication modules;
Step 4: add native vlan port on virtual switch;
Step 5: create multiple virtual network, access the native vlan port of specifying and start respective DHCP service respectively;
Step 6: create virtual flow-line, be respectively multiple virtual network create interface and by its access of virtual route, realize between virtual network three layers of communication;
Step 7: create outer network bridge, and accessing external network network interface card;
Step 8: create virtual flow-line, the configuration virtual machine realized in virtual network carries out outbound communication.
2. the distributed virtual network implementation approach being applicable to cloud platform according to claim 1, is characterized in that: described distributed virtual network be multiple virtual network service is operated on multiple physical node, the physical node of each operation virtual network service is as the network of virtual machine within the scope of independently network node control oneself;
Described virtual network refers to the inside private network that in cloud platform, virtual machine uses;
Described virtual network service refers to a dnsmasq service processes, for virtual machine provides DHCP service.
3. the distributed virtual network implementation approach being applicable to cloud platform according to claim 1, is characterized in that: described virtual switch module refers to open vSwitch software module;
Described virtual switch refer to utilize that open vSwich instrument creates, the virtual bridge being similar to physical switches function is provided;
Described interior network bridge and outer network bridge also refer to the virtual bridge utilizing open vSwitch instrument to create, and wherein, network bridge has accessed Intranet network interface card physical node connecting Intranet, and outer network bridge has then accessed outer net network interface card physical node connecting outer net;
Described Intranet refers to the physical LAN at cloud platform place;
Described outer net refers to Internet.
4. the distributed virtual network implementation approach being applicable to cloud platform according to claim 2, is characterized in that: described virtual switch module refers to open vSwitch software module;
Described virtual switch refer to utilize that open vSwich instrument creates, the virtual bridge being similar to physical switches function is provided;
Described interior network bridge and outer network bridge also refer to the virtual bridge utilizing open vSwitch instrument to create, and wherein, network bridge has accessed Intranet network interface card physical node connecting Intranet, and outer network bridge has then accessed outer net network interface card physical node connecting outer net;
Described Intranet refers to the physical LAN at cloud platform place;
Described outer net refers to Internet.
5. the distributed virtual network implementation approach being applicable to cloud platform according to any one of Claims 1-4, is characterized in that: between described bridge, connection refers to and utilizes the two ends of peer equipment to add two bridges respectively;
Described peer equipment refers to the virtual network devices such as veth, the patch with two ports.
6. the distributed virtual network implementation approach being applicable to cloud platform according to any one of Claims 1-4, is characterized in that: described internodal communication module comprises communication connection submodule and flow rule of communication submodule;
Described communication connection submodule arranges between node and is communicated with in which way, can be VLAN pattern, gre tunneling pattern, VXLAN tunnel mode etc.;
Described flow rule of communication submodule arranges the internetwork communication of open flows protocol rule managing virtual.
7. the distributed virtual network implementation approach being applicable to cloud platform according to claim 5, is characterized in that: described internodal communication module comprises communication connection submodule and flow rule of communication submodule;
Described communication connection submodule arranges between node and is communicated with in which way, can be VLAN pattern, gre tunneling pattern, VXLAN tunnel mode etc.;
Described flow rule of communication submodule arranges the internetwork communication of open flows protocol rule managing virtual.
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