xenserver ha

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(? ) Enterprise part of HA cluster

**Fence-virtd-multicast.x86_64:multicast Listener for FENCE-VIRTD **Fence-virtd-serial.x86_64:serial Vmchannel Listener for FENCE-VIRTDfence-virt.x86_64:a Pluggable fencing framework for virtual machines **(About three ,,, to be verified)FigureYum Install fence-virt.x86_64 fence-virtd-multicast.x86_64 fence-virtd-libvirt.x86_64[Email protected] ~]# Rpm-qa | grep FenceFence-virtd-libvirt-0.3.0-16.el7.x86_64Fence-virtd-0.3.0-16.el7.x86_64Fence-virtd-serial-0.3.0-16.el7.x86_64Fence-virtd-multicast

Ha High Availability Cluster

Ha High Availability ClusterHA (high available) is highly available and is also known as dual-machine hot standby for critical business. Simple understanding, two machines Web1 and WEB2, Normal is Web1 provide services, WEB2 standby idle, when Web1 downtime or service outage, will automatically switch to WEB2 machine continue to provide services, WEB1 and WEB2 have a heartbeat line, check the other's survival status, mobile IP, Also known as VIP, is t

Object-oriented Ha

: The original martial arts is so simple, is to exercise and play the maximum energy of the human body, casually a wave of an incomparable power. Back to basics This is the Ultimate Warrior, the eternal behind the bronze door (from the tomb-robbing note book).Whether it is the process-oriented, or object-oriented, whether it is a component-oriented, or service-oriented, in the final analysis of the world is only the abstract way and abstraction of the different granularity, the abstraction of th

Ha mode forced manual switchover: IPC ' s epoch [X] is less than the last promised epoch [x+1]

:266) at Java.util.concurrent.ThreadPoolExecutor.runWorker (Threadpoolexecutor.java:1142) at Java.util.concurrent.threadpoolexecutor$worker.run (Threadpoolexecutor.java:617) at Java.lang.Thread.run (Thread.java:745) .- One- - +: -: -,812WARN Org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager:Remote Journal192.168.58.182:8485Failed to write Txns54560-54560. WouldTryTo write to ThisJN again after the next log roll.org.apache.hadoop.ipc.RemoteException (java.io.IOException): IPC'S-epoch-i

[MySQL Case] HA: GTID_MODE configuration inconsistent

1.1.1. HA: inconsistent GTID_MODE configurations [Environment description] Msyql5.6.14 [Error message] In the initial state, both the Master and Slave enforce-gtid-consistency and gtid-mode are enabled, and both of them are changed to off. In this case, Slave reports an error: Last_IO_Error: The slave IO thread stopsbecause the master has @ GLOBAL. GTID_MODE OFF and this server has @ GLOBAL. GTID_MODE ON [Error cause] MySQL Master and Slave mus

Mysql HA-Install Keepalived + LVS + Mysql (dual master) On Redhat 6.3, keepalivedlvs

Mysql HA-Install Keepalived + LVS + Mysql (dual master) On Redhat 6.3, keepalivedlvs Host information: Scheduling node: Name: lvsOS: Redhat 6.3IP: rule: 192.168.56.236 data node 1: Name: rule: Redhat 6.3IP: 192.168.56.230 data node 2: Name: zbdba2OS: Redhat 6.3IP: 192.168.56.231 client: name: ogg2OS: Redhat 6.3IP: 192.168.56.231 Description: Data Node 1 and Data Node 2 are mutually active and standby. The application accesses the scheduling node from

Please also understand Java encryption and PHP's handsome guy, help me solve the ha

Please also understand Java encryption and PHP's handsome guy, help me solve ha. Import Java.security.MessageDigest; String s = "I am ABC"; Byte[] B = s.getbytes ("UTF8"); for (int i = 0; i System.out.println (B[i]);//This gets the same byte array as the PHP unpack ("c*", $str). } System.out.println ("-------------"); MessageDigest MD = messagedigest.getinstance ("MD5"); Md.update (b); byte tmp[] = Md.digest (); The MD5 evaluates to a 128-bit long int

PHP cannot read data in XML through SimpleXML. Pure beginner learning, less pat I ha.

PHP cannot read data in XML via SimpleXML ... Pure rookie study, less pat me ha.

[Water it] Ha, Lulu

(This article is purely fashionable. You are welcome to all kinds of complaints. If you are serious, you will lose) Today, I got off work late because of a program. When I went home for dinner, I used Nexus S to watch the push. The result showed that Google acquired the moto mobile phone for $12.5 billion (Note: Only mobile, not the entire Motorola. After analysis, various pieces of data surge. For example: @ Liumiao: It is said that the new Moto bell sound is: "Hello, Google ." I have a kuso

Consistent ha system algorithm

withstand the pressure of 1.5M .... Then we hang together ...So we can see through the above, the reason why we hang together, because if a machine is hung, then its pressure is all assigned to a machine, resulting in an avalanche.If we hang up, the data is evenly distributed to the BCD, and each machine is subjected to M/6 pressure, and then everyone will not hang up (regardless of hot data).The virtual node is introduced here,The space on the ring is divided into 8 parts, then a storage A1 an

Ajax asynchronous upload file data parameter----small Ha Co JS

Download ajaxfileupload.js (download URL: http://fileuploadajax.codeplex.com/downloads/get/20976) Modify Ajaxfileupload.js Internal Program1 one, about 32 lines2Createuploadform:function(ID, fileelementid,data)3 Two, about 47 lines4JQuery (Form). AppendTo (' body '); Add the code before5 if(data) {6 for(varIinchdata) {7$ (' ). AppendTo (form);8 }9 }Ten three, about 61 lines to modify One varform = Jquery.createuploadform (ID, s.fileelementid,s.data);View Code

LVS (Load balancer) +keepalived (HA) +nginx (reverse proxy) +web (dynamic static Web server)

{State SLAVEInterface eth0Mcast_src_ip 192.168.115.177VIRTUAL_ROUTER_ID 51Priority 99Advert_int 1Authentication {Auth_type PASSAuth_pass 1111}virtual_ipaddress {192.168.115.180}Track_script {Chk_http_port}}Write scripts under/opt chk_nginx.sh(required for two nginx servers)#!/bin/bashcounter=$ (ps-c nginx--no-heading|wc-l)if ["${counter}" = "0"]; ThenService Nginx RestartSleep 2counter=$ (ps-c nginx--no-heading|wc-l)if ["${counter}" = "0"]; ThenService keepalived StopFiFiGive permissions and Ex

Small Ha Co python----A line of code to output a heart shaped by a specific character "love"

Print ('\ n'. Join (['. '. "(' Love'[(x-y)% len (' Love'ifelse' for in for in range (30,-30,-1)])in one line of code, my love for you print ( ' \ n ". Join ([" . Join ([" * " if abs ((lambda A: lambda Z, C, N:a (A, z, C, N)) (lambda s, Z, C, n:z if n = = 0 else s (S, Z*z+c, C, n-1)) (0, 0.02*x+0.05j*y, +)) else " " for x in Range ( -80, x)]) For y in Range ( -20,)]) Python Mandelbrot ImagesSmall Ha Co python----A line of

VMware8 Implementing a Highly available (HA) cluster

requirements with WMwareA. Create two virtual machines and install the operating system, which is not described here;B. Add a network card to two blocks per virtual machine:The network card is added by means of Nat.For more information, please visit: http://blog.csdn.net/u013474104/article/details/43731153Effect:Note: Two NICs are required for each server.C. Storage environment, set when installed, as long as a server SAN/NAS/ISCSI storage as a data sharing storage space;3. Software Requirement

Keepalived+nfs+shell Script Implementation Nfs-ha high availability

MASTER #辅改成BACKUPInterface eth0VIRTUAL_ROUTER_ID 51Priority #辅改成50Advert_int 1Authentication {Auth_type PASSAuth_pass 1111}virtual_ipaddress {192.168.6.105}}Service keepalived StartWeb:mount-t NFS 192.168.6.1:/home/shares/shares4.ssh Password-Free loginSsh-keygenSsh-copy-id5.shell ScriptCd/etc/keepalivedVim notify_master.sh #判断NFS端口是否存在, stop keepalived service if not present#!/bin/bashport= ' Netstat-anp|grep 2049 'If ["$port" = = ""];then/sbin/service keepalived StopFiVim change.sh (required

Corosync basic concept of Linux ha cluster

:0txqueuelen:0 rxbytes:1112 (1.0kib) TXbytes:1112 (1.0kib) Node2 also need to do the same double-click Trust, the same operation, no longer demonstrated here2, configure the Epel source of the cluster softwareNode1[Email protected] ~]# cd/etc/yum.repos.d/[[email protected] yum.repos.d]# wget http://clusterlabs.org/rpm/epel-5/ Clusterlabs.repo [[email protected] yum.repos.d]# Yum install-y pacemaker CorosyncNode2[Email protected] ~]# cd/etc/yum.repos.d/[[email protected] yum.repos.d]# wget http

Ah ha! Algorithm Learning 1 sort-simple bucket sort

//sort 10 of 0-100 between numbers//defining an int array//this generates an array of 101 arrays that are expected to correspond to the input values to the index corresponding to the array, such as input 10 corresponding to a[10] inta[101]; //Array Assignment Generation for(inti =0; I 101; i++) {A[i]=0; } //declaring Variables intx; //Loop input 10 digits for(inti =0; I Ten; i++) { //Read input valuescanf"%d",x); //the value of the i

Memcached for Efficient ha

/memcachedchown-r memcached:/var/run/memcached vi/etc/init.d/memcached #添加下面行PORT =11211 user=memcached #ChangeMAXCONN =1024 cachesize=128 #根据本机内存修改OPTIONS = "" I p= ' ifconfig |grep ' inet addr ' |awk-f ': ' "inet addr" {print $} ' |sed-n 1p|awk ' {print $ ' #添加, get Ipchown $USER/usr/loc al/bin/memcached #找到下面一行/usr/local/bin/memcached–d-l $IP –p $PORT –u $USER –m $CACHESIZE –c $MAXCONN –P/VAR/RUN/MEMCAC Hed/memcached.pid $OPTIONS 5, start Memcache Chkconfig--add memcachedchkconfig memcached o

Spring Consolidated Redis Sentinel implements Redis ha service invocation __spring

First, Redis-sentinel ha framework to build For a detailed setup process, please refer to another article with the following address: Click to open the link Second, the introduction of a dependent jar package Third, spring configuration file Iv. redis.properties configuration Files redis.maxtotal=100 redis.sentinel.host1=127.0.0.1 redis.sentinel.host2=127.0.0.1 redis.sentinel.host3=127.0.0.1 redis.sentinel.port1=26379 redis.sentinel.port2=26479 r

Apache Hadoop 2.2.0 HDFS HA + yarn multi-Machine deployment

To deploy the logical schema: HDFS HA Deployment Physical architecture Attention: Journalnode uses very few resources, even in the actual production environment, but also Journalnode and Datanode deployed on the same machine; in the production environment, it is recommended that the main standby namenode each individual machine. Yarn Deployment Schema: Personal Experiment Environment deployment diagram: Ubuntu12 32bit Apache Hadoop 2.2.0 jdk

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