------------恢复内容开始------------ 集群分类: LB负载均衡集群(lvs/nginx(http/upstream, stream/upstream)),HA高可用集群,HP高性能集群. 高可用集群,英文原文为High Availability Cluster,简称HA Cluster,简单的说,集群(cluster)就是一组计算机,它们作为一个整体向用户提供一组网络资源.这些单个的计算机系统 就是集群的节点(node).高可用性集群(HA cluster)是指如单系统一…

Linux Cluster  -->  linux集群类型分三种: LB:负载均衡,LoadBalance HA:双机集群系统,指高可用性集群,High Available HP:Hadoop   LB的实现方式: 传输层:lvs 应用层:nginx, haproxy, httpd, perlbal, ats, varnish HA的实现方式: vrrp: keepalived AIS: heartbeat, OpenAIS, corosync/pacemaker, cman/rgmanager…

when you build a spark standalone ha cluster, when you submit your app,  you should send it to the leader master, not the standby master, how to decided the status of the two masters? a simple way, not judge the status which master is the active, you…

给namenode搭建了HA,然后根据网上的配置也配置了secondary namenode, 但是一直没有从日志中看到启动secondnary namenode,当然进程也没有. 找了很多资料,按照资料配置了,执行 hdfs getconf –secondaryNameNodes Incorrect configuration: secondary namenode address dfs.namenode.secondary.http-address is not configured. 但…

上一章我们分析了客户端调用服务端相关的源码,但是到了cluster里面的部分我们就没有分析了,本章将深入分析cluster和它的相关支持类. 1.clustersupport的创建过程,上一章的ReferConfig的initRef()方法中调用了相关的创建代码: for(Iterator iterator = protocols.iterator(); iterator.hasNext();) { ProtocolConfig protocol = (ProtocolConfig)iterat…

参考文章:https://ci.apache.org/projects/flink/flink-docs-release-1.3/setup/jobmanager_high_availability.html#bootstrap-zookeeper Flink典型的任务处理过程如下所示: 很容易发现,JobManager存在单点故障(SPOF:Single Point Of Failure),因此对Flink做HA,主要是对JobManager做HA,根据Flink集群的部署模式不同,分为Sta…

Keepalived简介 Keepalived是Linux下一个轻量级别的高可用解决方案.高可用(High Avalilability,HA),其实两种不同的含义:广义来讲,是指整个系统的高可用行,狭义的来讲就是之主机的冗余和接管, 它与HeartBeat RoseHA 实现相同类似的功能,都可以实现服务或者网络的高可用,但是又有差别,HeartBeat是一个专业的.功能完善的高可用软件,它提供了HA 软件所需的基本功能,比如:心跳检测.资源接管,检测集群中的服务,在集群节点转移共享IP地址的所…

see aslo:http://www.yellow-bricks.com/vmware-high-availability-deepdiv/ HA Deepdive My posts on VMware High Availability (HA) have always been my best read articles. I aggregated all articles in to a page which is easier to maintain when functionalit…

前提: 1.保证免密认证ssh 2.NTP时间是否同步: 3.保证防火墙,selinux关闭: 4.用户名互相能够解析:在hosts文件设置: 环境: 系统:centos6.8和centos7.2 IP规划: node1:192.168.254.200 node2:192.168.254.201 NFS:192.168.254.188 1.安装mysql,php,httpd 在node1,node2分别安装mysql和php,httpd mysql安装之前已经演示不需要在重新安装 NFS共享目录…

In a typical HA cluster, two separate machines are configured as NameNodes. At any point in time, exactly one of the NameNodes is in an Active state, and the other is in a Standby state. The Active NameNode is responsible for all client operations in…