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-VM1 can already ssh cirros-vm2, but Ping still does not pass, this is consistent with the expectation."Allow SSH" has already worked. At the same time, we also found that firewall rule to enter and exit traffic at the same time, do not distinguish direction. SectionFWaaS is used to enhance the security of the Neutron network, which can be used in conjunction with security groups. Here is a comparison of FWaaS and security groups.Same point: 1. The bo

generated by calling Gen () point to the same Code object, but each has its own stack frame. This stack frame does not exist on the actual stack, it waits to be used on the heap memory.The stack frame has a "last instruction" pointer pointing to the most recently executed instruction. At first, the last instruction pointer is-1 means that the generator has not yet started, which is why the above example has the next (g) line of code. The generator ca

=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20170214-1487051704139087108.png "/>In the case of CentOS 6.7n, you can directly glance the image-create command by converting it to an image type. The steps are as follows:1. In its details, record the ID: 228f7bdc-fcf1-4f6a-8a7a-298b86f9e94b650) this.width=650; "Src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20170214-1487051704230049849.png "/>2. The image is stored by

we have been learning Neutron local Network,flat network and DHCP service, from this section will be start discussing VLAN network. VLAN Networks is a network with tag, and is the most widely used type of network in practice.is an example of a vlan100 network.1. Three instance are connected to a Linux bridge named "Brqxxxx" via a TAP device. 2. The eth1.100 VLAN interface,eth1.100 connected to Brqxxxx is created on the physical NIC Eth1. 3. Instance t

we have been learning Neutron local Network,flat network and DHCP service, from this section will be start discussing VLAN network. VLAN Networks is a network with tag, and is the most widely used type of network in practice.is an example of a vlan100 network.1. Three instance are connected to a Linux bridge named "Brqxxxx" via a TAP device. 2. The eth1.100 VLAN interface,eth1.100 connected to Brqxxxx is created on the physical NIC Eth1. 3. Instance t

Today is the last section of the local network, and we will verify the connectivity of the two local network.Launch new instance "CIRROS-VM3", network selection second_local_net.The IP assigned to the CIRROS-VM3 is 172.16.1.102.The CIRROS-VM3 is schedule to the control node, and the corresponding tap device is tap5395d19b-ed.The console shows that CIRROS-VM3 has successfully received the IP address 172.16.1.102 from DHCP.But CIRROS-VM3 cannot Ping to CIRROS-VM1.This is expected because CIRROS-VM

-ueditor-image-20160929-1475155246496083388.jpg "/>The above configuration defines the label as ldquo;defaultrdquo; The range of VLAN Network,vlan IDs is 3001-4000. This range is for ordinary users to create a network within their own tenants. Because a normal user does not specify a VLAN when creating a network Id,neutron will automatically take the value from this range in order.For admin There is no VLAN ID limit, admin can create VLAN network with ID range

In the previous section we enable VLAN network in the ML2 configuration, and today we will create vlan100 and discuss the underlying networking changes.Open the menu, Admin, Networks, and click on the "Create Network" button.The Create page is displayed.Provider Network Type Select "VLAN". Physical Network fill in "Default" and must be consistent with Ml2_conf.ini network_vlan_ranges. The segmentation ID, which is the VLAN ID, is set to 100.Click "Create Network" to create a successful vlan100.C

;float:none; "/>Cinder-scheduler sending MessagesCinder-scheduler send a message to Cinder-volume, let it create volume source/opt/stack/cinder/cinder/scheduler/filter_scheduler.py, method for Schedule_create_volume.650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160623-1466685098724062746.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160623-1466685216794088544.jpg "style=" border:0px;white-space:normal;float:none; "/>In the

access. The above is a few steps to create the core of the virtual machine, of course, also omitted a lot of details, we will discuss in detail in later chapters. These steps show us the way the collaboration between the nova-* sub-services is, and the distributed design of the entire OpenStack system, which is very helpful for us to gain an in-depth understanding of OpenStack.In the next section we will detail the general design ideas for OpenStack components.650) this.width=650; "title=" "sr

PluginImplements the Extension Plugin API, maintains the status of router, load balance, security group and other resources in the database, and is responsible for invoking the appropriate agent to perform related operations on network provider, such as creating Built router.To sum up, Neutron Server consists of two parts: 1. Provides API services. 2. Run Plugin.That is Neutron Server = API + PluginsUnderstanding the layered model of Neutron Server m

one by one corresponding. That is, if you choose Linux Bridge plugin, then the Linux Bridge Agent will be the only option, and you must use Linux Bridge as a virtual switch on all OpenStack nodes (that is, the network provide R).Similarly, if you choose Open Vswitch plugin, only open vswitch can be used on all nodes, and no other network provider can be used.Issue 2: Large workload for developing new core pluginAll traditional core plugin need to write a lot of duplicate and similar database ac

;white-space:normal;float:none; "/>Click "Next", Set subnet IP address range for 172.16.1.2-172.16.1.100,instance IP will be assigned from Here. The default is enable DHCP, and you can also set subnet DNS and add static route Entries.650) this.width=650; "title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160830-1472562653398092190.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160830-1472563205657043860.jpg "style=" border:0px;white-space:normal;floa

provider, such as Radware,vmwareedge, are supported in addition to the default Haproxy,neutron.Restart the neutron service to ensure that the LBaaS is running properly.We will practice the following LBaaS environment.The environment is described as follows: 1. Create a Pool "Web Servers". 2. Two pool member "WEB1" and "WEB2" are all instance running Ubuntu cloud image. 3. The load balancer VIP is associated with the floating IP. 4. The client on the

"alt=" Image740.png "/>The environment is described as follows:1. Create a Pool "Web Servers".2. Two pool member "WEB1" and "WEB2" are all instance running Ubuntu cloud image.3. The load balancer VIP is associated with the floating IP.4. The client on the extranet accesses the Web server through the floating IP.At the beginning of the next section we will implement this LBaaS step-by-step.650) this.width=650; "Src=" http://7xo6kd.com1.z0.glb.clouddn.

messages Nova-compute Performing actions 1, 22 steps are performed on the control node to view the log of the NOVA-API. The 3rd step is performed on the compute nodes, viewing the logs of the Nova-compute.650) this.width=650; "title=" "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160505-1462406117920043007.jpg "style=" Border:0px;vertical-align:middle;color:rgb ( 63,63,63); font-family: ' Microsoft Yahei '; Font-size:1

the selected compute node can launch instance the source code on line 95th of the/opt/stack/nova/nova/scheduler/filter_scheduler.py by Select_destinations650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160526-1464216955163061317.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160526-1464217023638093973.jpg "style=" border:0px;white-space:normal;float:none; "/>Nova-compute Performing ActionsThe process of Nova-compute execution

/compute/api.py by Unshelve.nova-scheduler Execution SchedulingNova-scheduler the message is received, the appropriate compute node is selected for instance. View Log/opt/stack/logs/n-sch.logAfter screening, the final Devstack-controller is selected launch instance.Nova-scheduler sending MessagesNova-scheduler sends a message telling that the selected compute node can launch instance the source code on line 95th of the/opt/stack/nova/nova/scheduler/filter_scheduler.py by Select_destinationsNova-

In the previous section we discussed the first part of Cinder creating Volume, Cinder-api operation, this section continues the second part, Cinder-scheduler scheduling work.cinder-scheduler Execution SchedulingCinder-scheduler executes the scheduling algorithm and selects the optimal storage node log for/opt/stack/logs/c-sch.log through Filter and Weigher.Cinder-scheduler performs the dispatch work through Flow Volume_create_scheduler.The Flow executes Extractschedulerspectask and schedulecreat

-20161110-1478760595748056384.jpg "/>Visible, vxlan-100 VNI is 100, the corresponding VTEP network interface is eth1.At this point the VXLAN100 structure:650) this.width=650; "Src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20161110-1478760595861020045.jpg "/>In the next section we will deploy instance to vxlan100_net and analyze the connectivity of the network.650) this.width=650; "Src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20161110-1478760596091013180.j