heartbeat symbol

Drbd+heartbeat+nfs Summary Command recordPre-Preparation: 2 machines with disk, network 1 heartbeat line sync lineIt can be seen by fdisk-l that a piece of 10.7G device /dev/sdb,/dev/sdb to create a logical Volume: 123456789101112131415161718192021 [[emailprotected]~]#pvcreate/dev/sdb#创建pvPhysicalvolume"/dev/sdb"successfullycreated[[emailprotected]~]#pvsPVVGFmtAttrPSizePFree/dev/sda2VolGrou

------ From http://apps.hi.baidu.com/share/detail/33014978 Anyone who has experienced network application development knows that receiving and sending data on the network are implemented using socket in windows. However, if the socket is disconnected, the data sending and receiving operations may fail. But how can I determine whether this socket can be used? Some people must think of using the returned results in the send function for judgment. If the returned length is the same as the lengt

This article is actually a supplement to the section "high-availability NFS file server under production" in Chapter 5 of "building a high-availability Linux Server (version 2, in fact, software such as drbd and heartbeat can be automatically installed through yum. For example, the command for installing drbd is as follows: yum -y install drbd83 kmod-drbd83 The configuration file/etc/DRBD. conf of drbd is as follows: Global {# minor-count dialog-

The way the internet pushes messages is very common, especially mobile Internet, mobile phone can receive a lot of push message every day, after research found that the principle of these push service is to maintain a long connection (or can not achieve real-time effect), but the normal socket connection to the server consumption is too large, So there's a lightweight, low-consumption protocol like MQTT to maintain long connections, so how to maintain long connections:Before writing, we first un

How to Implement the heartbeat protocol in the socket-programmed Tcp connection, sockettcpTwo technologies are usually used to send heartbeat packets.Method 1: Heartbeat packets implemented by the Application LayerThe application itself sends heartbeat packets to check whether the connection is normal. The general meth

Ext.: http://www.kuqin.com/shuoit/20140623/340745.htmlRecently, because of the project needs, a simple trial of two highly available open source solutions: keepalived and Heartbeat. Both are very popular, but the difference is still very large, will be the experience of the trial process and the relevant knowledge points a simple summary, for everyone to choose the plan when reference.1)keepalived use more simple : From the installation, configuration

The simple explanation is: Short connection: Establish a connection, send a packet, close the connection Long connection: Establish a connection, send a packet, send a heartbeat packet, send a packet, send a heartbeat packet, send a heartbeat packet ... Therefore, frequent data sending and receiving, the short connection will frequently create a TCP connection,

Experiment Description:This experiment is based on Heartbeat CRM, which realizes high availability to MySQL service, and does not have high available MySQL data.Unfinished: The Specify mount option fails when using Hb_gui to configure Mount NFS.MySQL data and configuration files placed on NFS shared storageThe mysql configuration file is specified using--default-extra-file MySQL user has read and write access to the NFS share, and the ID number of the

#tail /var/log/messages configuration are correct, but Nginx error, modify Nginx configuration can be mar3109:34:47 FRANKTEST02NBSP;IPADDR (ipaddr_192.168.1.150) [11820]:info:/usr/libexec/heartbeat/send_arp-i 200-r5-p/var/run/resource-agents/send_arp-192.168.1.150eth0 192.168.1.150autonot_usednot_usedmar3109:34:47franktest02/usr/lib/ OCF/RESOURCE.D//HEARTBEAT/IPADDR (ipaddr_192.168.1.150) [11794]:info:succe

Original Url: Http://www.cnblogs.com/csdevNetworkcomms is a C # language written by TCP/UDP communication framework The author is the British used to charge the current author has open source license is: Apache License v2Open Source Address Is: Https://github.com/MarcFletcher/NetworkComms.NetWe know that after the TCP connection is established, if there is no heartbeat detection, the connection will be disconnected for a while. The NETWORKCOMMS framew

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 switchTo machine B continues to provide services.650) this.width=650; "src=" http://s4.51cto.com/wyfs02/M00/76/14/wKioL1ZJzlPA8p0GAAD0SqZ82KU379.jpg "title=" ha.jpg "alt=" Wkiol1zjzlpa8p0gaad0sqz82ku379.jpg "/>for an HA architecture, under a switc

how heartbeat restarts/closes, it will only affect the VIP. MySQL is not directly operated. On the one hand, it will not affect MySQL because heartbeat is not working properly; On the other hand, heartbeat switching can be made faster (because it saves time to start and stop MySQL), but there is a small drawback in doing so: MySQL is not automatically started

Mysql HA achieves high availability of MYSQL I. background Most websites currently use the classic configuration like MYSQL + Linux + APACHE. It is important for website administrators to consider how to prevent the unavailability of the entire website caused by spof, among them, the Database server's high availability is the top priority. For the high availability of databases, various commercial software vendors have their own solutions, such as Oracle OPS server and IBM DB2 (share-nothing arc

"Heartbeat" timeout detection is almost allC/SStructure of the application to handle a problem. The server needs to use it to promptly clean up unexpected client interruptions.This article hopes to change the detection time fromO (Number of all connected clients)DownO (Number of clients that have timed out). In general, this operation needs to traverse all clients in the connection state to find out which clients have timed out,AlgorithmComplexity:O

Netty realizes heartbeat sending mechanism Processing an idle connection is a common task, in order to be able to release resources in a timely manner, it is necessary to detect idle connections and timeouts on the server side, often by sending information to test an inactive link, usually called "Heartbeat," and then at the far end confirming whether it is still alive, Netty provides Idlestatehandler hand

0 3 -> 192.168.10.204:http Route 1 0 4 3. To implement a dynamic Ipvsadm forwarding rules table, you need to install Heartbeat-ldirectord, it will be able to heartbeat and LVS close combination, but also to detect the rear of the server state, when the server is invalid, automatically delete the article forwarding entry, That is, probing the rear Web cluster [Root@node1 ~]# RPM-IVH

Tags: heartbeatv2 for mysql+nfs high availabilityHeartbeatV2 for Mysql+nfs High availabilityPreparation before the experiment 1. time needs to be synchronized, we recommend using NTP Server synchronization time and create time synchronization schedule#ntpdate 172.16.0.1//First node #ntpdate 172.16.0.1//second node CRONTAB-E */3 * * * */usr/sbin/ntpdate 172.16.0.1 > /dev/null2. The root user is based on key authenticationSsh-keygen-t rsa-p "//Node one ssh-copy-id-i ~/.ssh/id_rsa.pub node3ss

Tags: Heartbeat LVS ldirectord ipvsadm I. Environment Configuration VIP: 192.168.222.222 Rip: 192.168.222.134 Rip: 192.168.222.135 Dr_master: eth0 192.168.222.128 eth1 172.16.0.1 (single NIC also works) Dr_slave: eth0 192.168.222.129 eth1 172.16.0.2 (single NIC also works) 2. Dr Configuration 1. Install software Yum install epel-release-y Yum install ipvsadm-y Yum install heartbeat-

Most CS applications require a heartbeat mechanism. The heartbeat mechanism is generally implemented on both the server and client, and the two have the same implementation principle. The client does not care about performance. If the application is TCP-based, you can simply achieve heartbeat through so_keepalive. When the keepalive timer is set, TCP sends a TC

1. Introduction to DRBD Distributed replication block device (DRBD technology) is a software-based, non-shared, replicated storage solution for Block devices (hard disks, partitions, logical volumes, etc.) between servers) image Features of DRBD image data: Real-time: When an application modifies the disk data, the replication immediately occurs. Transparency: application data is stored independently and transparently on Image devices, and data can be stored on different servers. . Synchronous i