heartbeat listener

pt-heartbeat Principle ResearchFirst, IntroductionMysql Seconds_behind_masterparameters are not accurate for master-slave delay measurements because his statistics are based onslave Sqlthreadand theI/O threadthe time difference, ifI/O threadbeNetwork Impact, this valuation is very inaccurate. More accurate master-slave delay detection is generally usedpt-heartbeat. pt-heartbeatdivided into two partsthe fir

The reason why the heartbeat is heavyDuring the use of the WebSocket process, the network disconnection may occur, such as bad signal, or the network temporarily shut down, this time the WebSocket connection has been disconnected,The browser does not execute the WebSocket onclose method, and we do not know whether to disconnect or not to Re-connect.If the WebSocket data is currently sent to the backend, once the request times out, the OnClose executes

Here first of all thank the wine brother to build a highly available Linux server This book, read this book and reference inside the configuration let oneself to drbd+heartbeat+nfs thinking clearly a lot. DRBD is simply a network raid-1, generally has 2 to multiple node nodes, the disk blocks created by each node will map to the local DRBD block, and then through the network to each node DRBD disk blocks synchronized updates. The role of

Label:The first time you install Oracle, there is no problem at all,But when I went to configure Oracle_home, I entered the database configuration Assistant by mistake,Then configure the existing database, there is a problem, pop up the above dialog box, how can not be configured,Directly into NET Manager to configure Tnsname.ora and Listener.ora have been failed to verify,Query a lot of information, about half a day, comprehensive and understand must be " database service is not registered to t

Tags: mysql drbd heartbeat high AvailabilityDrbd+heartbeat+mysql: Configuring High Availability for MysqlDescriptionToday, the second application of DRBD, using drbd+heartbeat+mysql: Configuring Mysql's High AvailabilityEnvironment:[Email protected] ~]# cat/etc/issue CentOS release 6.4 (Final) Kernel \ R on an \m [[email protected] ~]# una Me-r 2.6.32-358.el6.i6

This is a created article in which the information may have evolved or changed. When we use TCP IP communication, we need to use the heartbeat mechanism to determine the connection state between the server and the client, if the server's heartbeat timeout, and so on, will make a reconnection mechanism, Based on this problem, I recommend to you today a Go language based

Delphi Receives Heartbeat PacketAnyone who has developed a Web application experience knows that receiving and sending data in the network is implemented using sockets in Windows. However, if the socket is disconnected, there must be a problem when sending data and receiving data. But how can you tell if the socket is still available?One must have thought of using the return result in the Send function to judge. If the length of the return is the same

Configure the NTP server and Heartbeat V1 for httpd High Availability Establishment and use of NTP servers In high-availability clusters, the time requirements for each node are strict. Therefore, we need to configure an NTP server to implement the time synchronization of highly available clusters. Point other node time to this ntp and create an NTP server first. [Root @ localhost ~ ] # Rpm-q ntpNtp-4.2.6p5-1.el6.CentOS.x86_64 Since our server already

Install heartbeat with the original code Three packages are required. 1. groupadd haclient 2. useradd-G haclient hacluster Heartbeat-3-0-7e3a82377fa8.tar.bz2 Reusable-Cluster-Components-glue--glue-1.0.9.tar.bz2 ClusterLabs-resource-agents-v3.9.2-0-ge261943.tar Centos6.5 1 install glue Tar -jxvfreusable-cluster-components-glue--glue-1.0.9.tar.bz2 Cdreusable-cluster-components-glue-1.0.9 ./Autogen. Sh Error

How to Write a heartbeat packet received by Delphi 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 returne

DRBD Official tar Package: http://oss.linbit.com/drbd/Environment Introduction:System version: CentOS 6.4 (64-bit)Kernel version 2.6.32-358.el6.x86_64Software version: drbd-8.4.3.tar.gzMain: 10.0.0.1 from: 10.0.0.2The hosts on both machines need to be modified:[Email protected] ~]# vim/etc/hosts10.0.0.1 Node110.0.0.2 Node2Two dual-server network cards, where 10.0.0.x network card for the transmission of DRBD data, two servers directly connected to the network, used for transmission of the

WPF background data triggers interface status change-Heartbeat implementation, wpf background This year, I am working on a host computer industrial control WPF project. I will make a small summary and try again later. Please do not spray with blood. I'm just a cainiao. ___ by Bao It is similar to this; it generally means that by changing the value of a code variable, the circle color bound to this variable is also changing, which is a

When connected to the server, you can perform other operations to prevent frequent access to the client or frequent access to the client, but the server does not know, get a half answer to this situation. Of course, you can add a heartbeat packet in the suggestion, and then the server will renew the package at a certain time, check which response exceeds the time limit and no response is made. When the time exceeds the limit. However, this is a bit un

My PC has only one Nic, so I use a serial port to enable dual-host communication; 192.168.119.1 is the IP address of my vro. As an out-of-Domain Server, it checks whether the intra-Domain Server is normal; First configure the host file: 127.0.0.1 localhost127.0.1.1 Ubuntu 192.168.119.102 ubuntu192.168.119.103 Lab-Server Copy the configuration file: Cp/usr/local/ha/share/doc/authkeys/usr/local/ha/etc/ha. dCp/usr/local/ha/share/doc/ha. cf/usr/local/ha/etc/ha. dCp/usr/local/ha/share/doc/haresources

/ntpdateasia.pool.ntp.org>/dev/null ">/ var/spool/cron/root[[emailprotected]~]#ntpdateasia.pool.ntp.org21jun 17:32:45ntpdate[1561]:steptimeserver211.233.40.78offset-158.552839 sec[[emailprotected]~]#hwclock-w# Configuring SSH Trust [[emailprotected]~]# ssh-keygen[[emailprotected]~]#ssh-copy-id-i~/.ssh/id_rsa.pub[email ProtectedThree, installation configuration heartbeat(1). Install HeartbeatPerform installation operations #在ha-node1 and Ha-node2 [[ema

Crm resource score OverviewIn the Heartbeat of V2, to combine resource monitoring and switching, multi-node clusters are also supported, heartbeat provides an integration policy to control the switching policies between nodes of each resource in the cluster. This point mechanism is used to calculate the total score of each node. The highest score is used to manage a (or a group) Resource in the active state

1, under a long connection , there may be a long period of time without data exchange .Theoretically, this connection is always connected, but in practice, it is difficult to know what is wrong with the intermediate node.Some nodes (firewalls) automatically break down connections that have no data interaction for a certain amount of time. At this time, we need our heartbeat package, to maintain a long connection, keepalive2, the

The simple explanation is:Short connection: Establish a connection, send a packet, close the connectionLong connection: Establish a connection, send a packet, send a heartbeat packet, send a packet, send a heartbeat packet, send a heartbeat packet ...So with frequent data transmission, a short connection creates a TCP connection frequently, and for long connectio

To test the need, the system administrator helped to clone an Oracle database server to a virtual machine, I went up to delete the root, Oracle, Tomcat account crontab timed job, and then launched an Oracle database instance, delete the job under Oracle, And then start the listening times the following error: [oracle@egmlnx02 admin]$ Lsnrctl Stop Lsnrctl for linux:version 10.2.0.4.0-production on 10-mar-2014 09:15:44 Copyright (c) 1991, 2007, Oracle. All rights reserved. Connecting to (descripti

We often hear about the master-slave database architecture, and the heartbeat mechanism is also a common term in life. For those who are not satisfied with vocabulary, I always want to know how these two words represent.1. Database SwitchingThe replication function of MySQL can be used to implement master-slave, master-slave, dual-master-slave, and other highly available database clusters, however, some blogs or Article What is said in this section is