xenserver ha

HA (High available) High Availability cluster ( two-machine hot standby)1. Understanding: Two servers A and B , when a service, B idle standby, when a service outage, will automatically switch to the B machine to continue to provide services. When the host is back to normal, the data consistency is resolved through the shared storage system by automatically or manually switching to the host as set by the user.2. The software that implements this func

XenServer installation VM-first Resize and store the ISO image file, xenserveriso We all know that after xenserver is installed, no matter how large your disk is, There is only 4 GB space. Therefore, the operation is to create an LV volume and customize the size. 1. vgdisplay#View the remaining space first [root@XenServer /]# vgdisplay--- Volume group ---VG Na

Last night encountered a very depressing problem, XenServer machine XAPI can not start, all XE commands can not be executed, the only way to access only SSH, the problem is that there are many virtual machines on this machine is running, try a lot of methods have no effect, The only solution is to rebuild the environment without affecting the production after daybreak.Idea: Considering the use of local storage, the host should be able to recognize the

XAPIcall is using theXml-rpcthe protocol is sent over the network to the installationXenServeron the host. XAPIAn object's reference does not guarantee the object's persistent identifier, and the reference does not allow the object to be compared equally. Two references to the same object are not guaranteed to be the same text. ObjectUUID(universally uniqueidentifierThe purpose of the Universal Unique identification code) is to permanently name the customer by comparing the object'sUUIDstring te

Label:This series analyzes OpenStack's high availability (HA) concepts and solutions: (1) Overview of OpenStack high-availability scenarios (2) Neutron L3 Agent HA-VRRP (Virtual Routing Redundancy Protocol) (3) Neutron L3 Agent ha-dvr (Distributed virtual machine router) (4) RabbitMQ HA (5) MySQL HA1. MySQL

Tags: managing databases Oracle RAC HAOracle HA High Availability detailed (one, client, server-side service details): Http://write.blog.csdn.net/posteditWe've seen Taf. Oracle's session can be automatically reconnected, it should be explained that this capability is based on the OCI, is a function of the OCI, JDBC Thin driver Invalid, because this driver is not built on the OCI library.Although this feature originated in RAC, TAF is not limited to RA

Last year, wrote an article about XenServer virtual machine suspended animation problem, http://kaiqian.blog.51cto.com/236001/1625411 interested students can see this article.Some time ago, I was asked to reflect on this problem, so the continuation of the idea did a further troubleshooting.Phenomenon: A xenserver on the normal operation of the process, a number of virtual machines into the state of the bri

Citrix XenServer is a value-led, industrial-grade, open-source virtualization platform for managing cloud, server, and desktop virtualization infrastructures. Any organization can download XenServer for free, virtualize the required workloads and automate the management process, enhance it agility, agility, and reduce costs.1. XenServer Frame compositionThe Citri

To start installing the operating system on the VM, although XenServer already contains multiple templates, such as redhat as 4+5, CentOS, SuSE, Oracle Enterprise Linux, and so on, there is no need to download the original installation discs at installation time; If you are not in the list, such as redhat as 3, you must install it using the CD-ROM method. This shows you how to install the required operating system in ISO format when adding VMS. First

It is necessary to install XenServer on a virtual machine on windows 8, whether it is a hypervisor or a virtual machine operating system (OS ). With this tool, you can find the drivers, disk controller drivers, and a management agent that support virtual network devices to provide better integration and program management. The agent can provide feedback on the performance and running status to the system administrator. Although installing the tool is

; PARAMETERS[5]. Value = model. Returnorderreason; PARAMETERS[6]. Value = DateTime.Now.ToString ("yyyymmddhhmmssfff") + moDel. Userid.padleft (5, ' 0 ') + "RO"; Dbhelpersql.runprocedure ("Api_returnorder_add", parameters, out rowsaffected); return (int) parameters[0]. Value; } Stored procedures: CREATE PROCEDURE api_returnorder_add@returnorderid int output, @ProductSKUId int, @UserId int, @ReturnCount int,@ Applyreturnmoney Decimal (18,2), @ReturnOrderRe

The agent can provide feedback on the performance and running status to the system administrator.Although installing the tool is simple, you must note that you must restart the virtual machine after installation, as is true for any hypervisor.The reason for restarting the host is that the disk controller drivers and some network drivers cannot be hot removed or replaced. Restart the VM to bring the host back to initialization.For a virtual machine to install

Just one of the problems I had before, today to demonstrate again to restore the problem, to see how to achieve recovery. [Root@xenserver-ds-testserver04 ~]# Cat/etc/fstabUuid=6f29f0ba-a0ea-4799-bdf4-51570d8354c6/iso_storage EXT4 Defaults 0 0[Root@xenserver-ds-testserver04 ~]# DF-HPFileSystem Size Used Avail use% mounted on/DEV/SDA1 18G 1.8G 16G 11%/Devtmpfs 2.0G 8.0K 2.0G 1%/devTmpfs 2.0G 592K 2.0G 1%/DEV

In the previous article, we introduced the XenServer Bridge network stack pattern, and now in this document we will cover another open-source network stack pattern supported by XenServer: Open vswitch. XenServer now the version of the deployment is installed by default in open Vswitch mode, if we do not need to do LACP or bind more network cards and the use of di

The machine-level HA for the Nameserver of TFS can be done through the virtual IP mechanism. You only need a 'heartbeat' to solve the problem. The following is a simple example of the next step. ** Operating system **: 'centos 6.4 x86_64 '** Heartbeat **: ''' [root @ jdzhan1 ha. d] # rpm-q heartbeatheartbeat-3.0.4-2.el6.x86_64 ''' ----- ** Step0 **: Install Heartbeatyum installation and source code installa

Problem As we all know, in Python, The + operator can be used on the list, and the + operator only needs the second operand to be iterated (Original: iterable. @ Justjavac), then+ The operation can obviously be performed on "ha. The Code is as follows: >>> x = []>>> x += "ha">>> x['h', 'a']>>> x = x + "ha"Traceback (most recent call last):File "Answer When we use

Label: Oracle HA High Availability specific explanation (one, client, server-side service specific explanation): Http://write.blog.csdn.net/postedit We've seen Taf. Oracle's session can be connected on its own initiative, and it needs to be explained. This capability is based on the OCI and is a function of the OCI, and the JDBC Thin driver is invalid. Because such a drive is not built on the OCI library. Although this feature originated in RAC. But

Check the hard drive information first. [Root@xenserver-ds-monitor01 ~]# Smartctl--ALL/DEV/SDASMARTCTL 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0+10] (local build)Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org= = = START of Information section = = =Device Model:plextor px-512m6s+Serial number:p02620100868LU WWN Device id:5 002303 1009083c8Add. Product id:sc902040Firmware version:1.00User capacity:512,110,190,592 bytes [GB]

The Hadoop version of the experiment was 2.5.2, the hardware environment is 5 virtual machines, using the CentOS6.6 operating system, the virtual machine IP and hostname are:192.168.63.171 Node1.zhch192.168.63.172 Node2.zhch192.168.63.173 Node3.zhch192.168.63.174 Node4.zhch192.168.63.175 Node5.zhch SSH password-free, firewall, JDK here is not a repeat. The role assignments for virtual machines are:Node1 main Namenode1, Master Resource Manager, zookeeper, JournalnodeNode2 to prepare namendoe1, zo

Due to the time relationship, the original plan on the Hadoop cluster2 implementation of Ha+nfs+zookeeper, changed to implement on the Hadoop cluster1, so that the SSH no password login configuration link and hadoop cluster configuration link. The configuration environment of this article is based on the HDFS HA series experiment Two: Ha+journalnode+zookeeper. 1: