postgresql ha

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

Application and database development Cluster also need HA software? The so-called cluster technology (Cluster), also translated into clusters, covering three technical directions: Highly AvailableHA(High availability); Load BalancingLB(Load Balance); High Performance ComputingHPC(High performance Computing). For the business sectorITapplications are primarily concerned with high availabilityHAand load BalancingLBthese two parts. In order to ensure hig

OracleHA high availability (II. In-depth analysis of TAF and HA Framework) Oracle HA high availability (one, client, server service details): http://write.blog.csdn.net/postedit We have seen that the Oracle session of TAF can be automatically reconnected. It must be noted that this capability is based on OCI and is a function of OCI, and JDBC Thin Driver is invalid, because this driver is not built on the O

PrefaceAny system, even if it does a large, there will be a variety of unexpected situations. Although you can say that I have done all the accident on the software level, but in case of hardware problems or physical aspects of the problem, I am afraid it is not more than a few lines of code can be solved immediately, said so much, just want to emphasize the importance of HA, system high availability. In yarn, Namenode

HA (high available) is highly available and is also known as a dual-machine hot standby for critical business. The simple understanding is that there are two machines A and B, the normal is a service, B standby idle, when a down or service outage, will switch to the B machine to continue to provide services. Commonly used high-availability open source software has heartbeat and keepalived, where keepalived has load-balanced functionality. The experime

The Juno version of L3 Ha employs the Keepalived tool, which implements the VRRP protocol internally. First to introduce the following VRRP:VRRP IntroductionVRRP is a routing fault-tolerant protocol, or it can be called a backup routing protocol. All hosts in a local area network set the default route, and when the destination address of the network host is not in this segment, the message will be sent to the external router through the default route,

(1) User PracticalityProgram: Createdb creates a new PostgreSQL database (same as SQL statement: Create Database) Createuser creates a new PostgreSQL user (same as SQL statement: create user) Dropdb deletes a database Dropuser: delete a user Pg_dump exports the PostgreSQL database to a script file Pg_dumpall: export all

Today, we will focus on the actual operation steps for correctly implementing the full DB2 dual-host HA solution on the Linux operating system, the following is a detailed description of the actual operation steps for correctly implementing the full DB2 dual-host HA solution on the Linux operating system. We hope you will have a better understanding of the steps after browsing. This document describes how t

I. BACKGROUND The cloud trend in the second half of 2012 began to provide a large state-owned bank's historical transaction data backup and query technology solutions based on Hadoop, due to the industry's particularity, customer service availability has a very high demand, and HDFs has long been a problem with the point of trouble, until Apache Hadoop released its 2.0 alpha version in May 2012, where MRv2 is still immature, and HDFs new features are already largely available, especially the hi

/doc/heartbeat-3.0.4/haresources/etc/ha.d/haresourcesThe contents of the configuration file are as follows:[email protected] ha.d]# cat ha.cfdebugfile/var/log/ha-debuglogfile/var/log/ha-loglogfacility local0keepalive 2deadtime 30warntime 10bcast eth0 # linux#bcast eth1 eth2 # linux#bcast le0 # Solaris#bcast le1 le2 # solarisauto_failback onnode zbdba1node

ActiveMQ notes (2): HA solution based on ZooKeeper, activemqzookeeper Activemq official website provides three master/slave HA solution, see: http://activemq.apache.org/masterslave.html, based on shared file directory, db, zookeeper. The following shows how to build an activemq Cluster Based on zookeeper on the local machine: 1. Install activemq in the activemq1 directory (refer to the previous article) and

, WEB2 will detect the heartbeat information to stop, so take the mobile IP, continue the user processOf course, this process is transparent to the user, she just has been connected to the mobile IP, unless two machines are down, VIP interruptOtherwise web1 outage, VIP transfer to WEB2 continue to provide services;Today's practice is to build high-availability servers with heartbeat.Pre-preparationTwo servers, I use two virtual machines, IP is the main 192.168.1.103, standby 192.168.1.113, mobil

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/73/B9/wKioL1YFQDbS5kT3AAE3pr6YBa8619.jpg "title=" Image.png "alt=" Wkiol1yfqdbs5kt3aae3pr6yba8619.jpg "/>Primary and Standby Mutual resolution set multiple IPs# vim/etc/hosts192.168.7.2 css01192.168.7.3 CSS02Second, configure the extended Yum sourcewget www.lishiming.net/data/attachment/forum/epel-release-6-8_64.noarch.rpmRPM-IVH epel-release-6-8_64.noarch.rpmThird, upload the installation packageYum-y Install LrzszCd/usr/local/srcRzYum-

First, High available HA (high available) is highly available and is also known as a dual-machine hot standby for critical business. The simple understanding is that there are two machines A and B, the normal is a service, B standby idle, when a down or service outage, will switch to the B machine to continue to provide services. Commonly used high-availability open source software has heartbeat and keepalived, where keepalived has load-balanced f

protected] spark] #./sbin/start-master.sh 2. Standby masters with zookeeper Used in production mode. The basic principle is to use zookeeper to elect a master, and other masters are in the STANDBY state. Connect the standalone cluster to the same zookeeper instance and start multiple masters. With the election and state saving functions provided by zookeeper, one master can be elected, while other masters are in the STANDBY state. If the current master dies, the other master will be elected an

PostgreSQL database server listener settings and Client Connection Methods tutorial, postgresql Server As we all know, PostgreSQL is a free object-relational database server (Database Management System). It is an open-source database system that can be used for free. This article describes in detail the listener settings and Client Connection Methods of the

VMware virtual machine reserved memory is related to HA access control, disk usage capacity, respectivelya cluster , a total of 256GB memory host,HA access control policy to allow a host failurethe current the HA runtime information is as follows:Slot size:CPU 32MHzMemory 8GBTotal Slots :280 (max. host capacity)Used slots :16Available Slots :236Failover Slots :(

1. The SUMMARY This document describes the basic steps for installing a high reliability scheme for configuring DB2 UDB Enterprise Serverv8.2 dual-machine SuSE Linux Enterprise Server v8.0 (SLES 8). The scheme is implemented as an HA implementation component in conjunction with the SLEs Volume Manager (LVM) and Veritas Cluster Server v2.2 (VCS 2.2). 2. Overview This document assumes that the reader has understood the basic concepts of the

This article first introduces the basic principles and 2 ways of hadoop2.0 HA (High avalability). 1 overview Before hadoop2.0, there was only one namenode, there was a single point of issue (although hadoop1.0 had secondarynamenode,checkpointnode,backcupnode these, but the single point problem still exists). The HA mechanism was introduced in hadoop2.0. Hadoop2.0 's ha