heartbeat symbol

First verify that the heartbeat status is normal and that there is no secondary IP[[Email protected] data]# IP add|egrep "0.17|0.18"inet 10.0.0.17/24 BRD 10.0.0.255 scope Global secondary eth0[[Email protected]/]# IP add|egrep "0.17|0.18"inet 10.0.0.18/24 BRD 10.0.0.255 scope Global secondary eth0Stop a DRBD high available and view:[[Email protected] data]# IP add|egrep "0.17|0.18"[Email protected] data]#[[Email protected]/]# IP add|egrep "0.17|0.18"i

Absrtact: The long connection between server and client is realized through Netty, and heartbeat detectionThe long connection between server and client is realized through Netty, and heartbeat detection.Basic idea: The Netty server saves all connected client Socketchannel through a map, and the client ID is the key to the map. Each time the server side wants to send a message to a client, simply take out th

Heartbeat pack: It's like a heartbeat. Send it at regular intervals to tell the server that the client is still alive. In fact, this is to maintain a long connection, as for the contents of this package, there is no special provisions, but generally are very small packages, or only a packet containing the Baotou.Within the TCP mechanism, there is a mechanism for the presence of a

OutlineI. What is a highly available clusterIi. What is high availabilityThree, high availability cluster related conceptsIv. Heartbeat Version V1 exampleV. Heartbeat Example of V2 versionVi. Heartbeat Version V3 exampleI. What is a highly available clusterHigh-availability cluster, the English source for the higher availability Cluster, referred to as Ha Cluster

1. How heartbeat packets are sent:The main client is sent to the server, the server received, and then reply.Before doing the project, WPF communicates with U3d, the WPF side is on the listener side, and u3d belongs to the client, constantly sending a heartbeat packet to WPFThe WPF side code is as follows:Embed U3d windowvoid Initu3d (){To add a Exehost control to a Winformhost controlif (userdata.enableemb

About node eviction of Oracle RAC caused by heartbeat network (not instance eviction)Ask:Suppose the following scenario: 4 nodes RAC, the heart jumper is the thousand m network switch, if the thousand m network switch power off, I want to know the CRS of the expulsion node algorithm is how?Oracle Dalian GCS Reply:If the heartbeat network is broken, Oracle's cluster will split into several small groups of it

In order to make our service procedures more stable, some detail problems must be solved. As mentioned in the previous talk of the client unplug the network cable, causing TCP to become a dead connection on the server, if the number of dead connections, the server can be long-term stable operation is a huge threat.In addition, after testing, if there is a TCP connection on the server, then the service program connects to the database, which will also produce a dead connection. This also poses a

connection to set a timeout can be done, and in the Golang net package, there is no long-connected function, So we need to design and implement our own processing strategy for long connections. For Socke long connections, it is common practice to design a communication mechanism between the server and the socket, and when there is no information interaction between the two, the two parties will periodically send packets (heartbeats) to maintain the connection status. This method is currently u

default, show Processlist, if a non-standard 3306 port is used in the way of show SLAVE hosts, it is recommended to use the DSN method to manually specifyCheck that all tables in the library are synchronized on the master and slavePt-table-checksum--nocheck-replication-filters--no-check-binlog-format--set-vars innodb_lock_wait_timeout=50-- Replicate=percona.checksums--databases=db07 h=192.168.1.126,u=checksum,p= ' xxx ', p=3306Output Result:TS ERRORS diffs ROWS CHUNKS skipped time TABLE12-05T19

Experimental Purpose: to implement a Linux system cluster concurrently processing a service ( here , for example , Web Services). experimental Material:8g Memory, Core i5-3230m, nvidia 720m win10 host. Centos6.4 Full version of the image, installed vmware11, three installed pure centos6.4 virtual machine. Experimental principle:Lvs does not need to be installed, because the linux2.6 kernel is covered, the name is IpvsadmExperimental steps:The first step installs the support package:Yum-y Instal

1, Netty Heartbeat, unlike Mina,mina has a heartbeat base class, and Netty did not, Netty's heartbeat is also inherited Channelinboundhandleradapter rewrite Channelread; The following code implementation: 30 read idle service, the client sent ' + ', the client received, back '-', if the server to send 3 consecutive or not received '-', then disconnect The main

time to determine the connection availability. The general time is 7200 s, failed to retry 10 times, each time out of the time of the S. Obviously the default value does not meet our needs, and the modified settings can be satisfied. The answer is still negative. Because the TCP KeepAlive is used to detect the death and death of the connection, the heartbeat mechanism comes with an additional function: Detecting the surviving state of the communica

HEARTBEAT+LDIRECTORD+LVS+HTTPD Cluster deploymentFirst, the hardware environment4 virtual machines on the same network segmentOperating system: centos6.3Turn off unnecessary service scripts for the system#!/bin/bashservices= ' Chkconfig--list|cut-f1|cut-d ""-f1 ' for ser in $servicesdo if ["$ser" = = "Network"] | |["$ser" = = "Rsyslog"] | |["$ser" = = "sshd"] | |["$ser" = = "Crond"] | |["$ser" = = "ATD"]; Then Chkconfig "$ser" on Else Chkconfig "$ser"

Linux Advanced Skills: heartbeat + lvs (2) and heartbeatlvsThe previous post introduced the separate use of heartbeat. Today we will first introduce the separate use of lvs, and finally combine the two. Provide a comprehensive service.1. Three load balancing technologies of LVS:Fortunately, the LVS module has been built in kernel 2.6x, and The LVS installation package ipvsadm is also available in redhat6.Ne

The business process is like this. our php Server uses socket to connect to the other server, and the other server will send messages to our php server from time to time. Therefore, we need to read the php server all the time, at the same time, you also need to send a heartbeat to each other every three minutes. When php keeps reading, the other party does not send a message... the business process is like this. our php Server uses socket to connect t

Installation process http://xiong51.blog.51cto.com/5239058/1826190Vim/etc/hosts192.168.0.30 MYSQL1192.168.0.31 MYSQL2Please note that MySQL installation must use the same disk, to avoid the next login inconsistent,Heartbeat do not enable service on standby will cause the master to break the file out of sync, workaround: You can use NFS, DRBD, iSCSINFS Settings/nfsfile 192.168.0.30/24 (rw,sync,no_root_squash) do not use root compression, avoid permiss

For Oracle RAC node eviction caused by heartbeat Network (not instance eviction), oraclerac Node eviction of Oracle RAC caused by heartbeat Network (not instance eviction) Q:Suppose the following scenario: for the four node rac, the heartbeat line uses a m network switch. If the M network switch loses power, I want to know the algorithm of the crs eviction no

Business process is like this, we PHP server with the socket connection to the other server, the other server will send a message to our PHP server, so we need to read,read PHP always need to send a heartbeat every three minutes to each other, when PHP has been read, When the other party did not send the message, PHP has been waiting, how to ensure that every three minutes to send a heartbeat? Reply con

1. IntroductionVcenter Server heartbeat provides mission-critical high availability for VMware vcenter Server, protecting your virtual infrastructure from hardware, network, configuration, and more, Windows-based services for VCenter The server configuration provides high-availability protection without the need for dedicated hardware. VCenter Server Heartbeat is based on a pair of clonedThe active/passive

Reprinted: http://23live.cn/server/lvs-keepalived-haproxy-heartbeat/ I have been reading some highly available Server Load balancer solutions recently. Of course, hardware devices such as F5 cannot afford or access them. You can only look at these open-source solutions for free. Currently, LVS and haproxy are both used to achieve load balancing. keepalived and heartbeat both improve high availability an