postgresql ha

Brief introductionBy installing the Linux-ha software, we can realize the high availability solution of the Linux dual-machine system, realize the hot backup of the dual-machine system, and be able to switch seamlessly between the two machines, thus externalProvide stable and reliable service, and finally realize the System High performance RAS (reliability, availability, and serviceability). Experimental environment650) this.width=650; "Src=" H

A Brief Introduction to ha high-availability software in linux in China-general Linux technology-Linux technology and application information. The following is a detailed description. 1. vcs. I think bz has many misunderstandings about vcs. I know that zte/hw has basically used vcs in most telecom projects since, and basically all of them are core applications, there is no doubt about the stability of vcs. The only drawback is that it is expensive. In

This article describes the principles of the HA mechanism and the Hadoop2 ha configuration process.————————————————————————————————————————————————————————————————————the principle of HA mechanismThere are two namenode:active NameNode and standby NameNode in Ha. Where active NN is the primary node, and standby nn as th

balance between. More discussion of system performance and architecture is also being carried out around consistency and availability.2) engineering practices for OpenStack, Swift and CapIn contrast to cap theory, OpenStack's distributed object storage System, swift, satisfies availability and partition tolerance, without guaranteeing consistency (optional), but achieving eventual consistency. Swift if the get operation does not include the ' x-newest ' header in the request header, then this r

HA cluster high-availability clusters are divided into the following steps:Dot I-->ha cluster basic conceptDot I-->heartbeat implement haDot I-->corosync detailedDot I-->pacemaker detailedDot I-->drbd detailedDot Me--heartbeat resource management based on CRMDot Me--corosync+pacemaker+drbd+mysql to implement a highly available (HA) MySQL clusterDot Me--heartbeat+

1. Background of HDFS Federation In hadoop 1.0, the single namenode Design of HDFS brings about many problems, including single point of failure (spof), memory restriction, and cluster scalability and lack of isolation mechanisms (different businesses use the same namenode to affect each other) to solve these problems, hadoop 2.0 introduces the HA solution and HDFS Federation based on shared storage, which focuses on HDFS Federation. HDFS Federation m

The main purpose of HA (high availability, highly available) clusters is to increase the online rate of service, that is, to shorten the average The time of the failure. In fact, when a service node is not in the line, another node that provides the same service can continue to provide services to avoid a single point of failure. HA cluster related concepts One, the related noun explanation 1, the online r

(1) The use of the HA switch script, stop the database script and start data script at the end of the need to add the statement "Exit 0" (ha switch when the HA script will check the switch script, ha switch script return value of not 0 will be an error.) Ha switchover failed

MySQL's official HA middlewareHttp://www.mysql.com/products/enterprise/fabric.htmlMySQL Fabric is a extensible framework for managing farms of MySQL Servers. The features has been Implemented-high availability (HA) and scaling out using data sharding. These features can be used in isolation or in combination.Webinar:mysql fabric-high availability automated sharding?Both features is implemented in both laye

Before recovering RAC and ha, notice the difference between the two in the recovery process, but not recorded, today in the recovery is a bit forgotten, hurriedly record, used for later recovery test time to help memory.The differences and similarities between RAC and HA can be described in many documents on the Web, which is not discussed here.Here I only describe the differences I observed:1: First, in RA

This article mainly introduces Hadoop2.0 HA (HighAvalability high availability). Before introducing the HA configuration of hadoop2.0, This article first introduces the basic principles and two methods of hadoop2.0HA. 1. Overview before Hadoop2.0, there was only one NameNode and there was a single point of failure (although Hadoop1.0 had SecondaryNameNode, checkPointNode This article mainly introduces

Hadoop2.6 + HA + Zookeeper3.4.6 + HBase1.0.0 cluster Installation Detailed records of cluster Installation Process of Hadoop2.6 + HA + Zookeeper3.4.6 + HBase1.0.0. Install hadoop2.6 + HA 1. Prepare a CentOS6.4 System 2. Five servers in the CentOS6.4 Environment Machine name IP address installation software running process Master1 192.168.3.141 hadoop, Zookeeper,

Content:1, Master ha parsing;2, Master ha of four ways;3, the internal working mechanism of Master ha;4, the Master Ha source code decryption;This talk main source angle Analysis Master HA, because in the production environment must do==========master

Recently, a Hadoop cluster was installed, so the HA,CDH4 that configured HDFS supported the quorum-based storage and shared storage using NFS two HA scenarios, while CDH5 only supported the first scenario, the Qjm ha scenario. About the installation deployment process for Hadoop clusters You can refer to the process of installing CDH Hadoop clusters using Yum or

The concept of cluster and high availability (HA), clusterha Reposted from: http://www.cnblogs.com/blackwizard2016/p/5143816.html, which is used only for learning. 1.1 What isCluster To put it simply,Cluster (ClusterIs a group of computers,They provide users with a set of network resources as a whole. TheseA single computer system is a cluster node ). An ideal cluster is that the user will never realize the underlying node of the cluster system. In hi

High Availability Analysis of MySQL: MySQL HA solution For most applications, MySQL is the most critical data storage center. Therefore, we have to deal with the problem of how to make MySQL provide the HA service. When the master is running, we need to think about how to ensure that data is not lost as much as possible. Here, I will talk about the MySQL proxy and toolsets work we have done during this per

HA (Highly available high avaiilable) clusterWEB1 provides services, if the 1 main outage, 2 ready to be enabled immediately, so that there is no impact on the user side.Configure the one Mind jumper to pass the information when the schema is in order. Mobile IP is also the VIP, is the master-slave external common IP.650) this.width=650; "src=" http://s1.51cto.com/wyfs02/M00/8B/93/wKioL1hSDmezD2T2AABioDWW6tM868.jpg "title=" h2.jpg "alt=" Wkiol1hsdmezd

Brief introduction This wizard outlines the HA for Yarn explorer and details how to configure and use this feature. RM is responsible for tracking resources in the cluster and dispatching applications such as MapReduce jobs. Hadoop2.4 Previously, RM was a single point of failure in a yarn cluster. The HA feature adds redundancy to the cluster in the form of active/standby RM pairs, eliminating this si

By: http://blog.vfocus.net Heartbeat + drbd If the primary server goes down, the loss is immeasurable. To ensure uninterrupted services on the master server, you need to implement redundancy on the server. Among the numerous solutions for implementing server redundancy, heartbeat provides us with a cheap and Scalable high-availability cluster solution. We use heartbeat + drbd to create a HA cluster server in Linux.Drbd is a block device that can be us

Objective:This article turns to self personal blog http://www.anyisalin.com welcome everyone to visitWhat is heartbeat:The Heartbeat project is an integral part of the LINUX-HA project, which implements a highly available cluster system.Why to use heartbeat:High availability of services in Linux requires HA clusters, and HA clusters require software that provides