isp failover

After configuring multiple dataservers, you need to consider the single point of failure problem of nameserver. This article will introduce how to implement ha for the nameserver of TFS. It is officially recommended to use heartbeat, but the implementation configuration of heartbeat is much more complicated than keepalive, therefore, keepalive is used to implement ha and Failover of namserver. Environment Introduction: NS Server 1 --> 192.168.1.225 N

Tokyo CabinetIt is a dBm database developed by the Japanese pinglin yixiong. It reads and writes 1 million data records in hash mode in 0.643 seconds and reads 1 million data records in 0.773 seconds, it is several times that of DBM such as Berkeley dB. 　　 Tokyo tyrantIs the network interface of the Tokyo cabinet database developed by the same author. It is compatible with memcached and can exchange data over HTTP. Tokyo tyrant and Tokyo cabinet constitute a distributed persistent storage syste

The role switching between Data guard master and subordinate libraries is divided into the following two kinds: 1) Switchover Swithchover are usually artificial and planned for role swaps, such as upgrades. It is usually lossless, that is, there will be no loss of data. Its implementation is mainly divided into two stages: Primary to standby. Standby (one) to primary 2) Failover Failover means that be

Tags: client technology help root write Ann not http altWhat is a replication set? A replica set (replica sets) is an additional copy of the data that is the process of synchronizing data across multiple servers, which provides redundancy and increases data availability, and enables recovery of hardware failures and outage services through replication sets. Benefits of replication Sets Make your data more secure. High data availability. Disaster recovery. Maint

In the master-slave architecture, create an event on the master, as shown below: mysqlshowcreateevent 'insert' \ G; * *************************** 1. row ***************************.. In the master-slave architecture, create an event on the master, as shown below: mysqlshowcreateevent 'insert' \ G; * *************************** 1. row ***************************.. In the master-slave architecture, create an event and virtual host on the master, as shown below: When slave is synced, the resul

Http://inthirties.com: 90/thread-1304-1-1.html The customer's RAC environment has problems. A taf connection is established. Once one of the servers is disconnected, the server cannot be failover. The entire RAC database cannot be accessed. The configuration of listener is coming to mind immediately. Check the configuration and status of listener immediately. Due to the customer's privacy agreement, only words can be used to recallThe operation was c

not start resource 'ora. RAC. rac1.inst '. [Oracle @ racdb01 admin] $ crs_start ora. RAC. rac1.instCRS-1028: dependency analysis failed because:'Resource in unknown state: ora. RAC. rac1.inst'CRS-0223: Resource 'ora. RAC. rac1.inst 'has placement error. 19. I continued to search for information on the Internet. After a long time, it was still invalid.20. I saw an article on Metalink saying that tnsnarac. ora is faulty.21. Check my tnsnarac. ora and find that the original racdb service (for tran

MySQL master database High Availability-Dual-master single-active failover Solution Preface: (PS: Preface was added later when this article was modified.) Some bloggers raised some questions and opinions about this article and paid attention to it, it also prompted me to make this set of things more practical and safer. Later I thought about it and made some changes to some conditions and behaviors in the script. After several modifications, I finally

may consider configuring persistence on the slave instance. When the master instance goes down, you can manually or automatically promote the master instance from the instance to continue providing services! After the master instance is restored, the data is synchronized from the original Instance. After the synchronization is completed, the data is restored to the original master-slave state! To meet this requirement, we need the cooperation of keepalive. On the one hand, keepalive provides VI

#故障转移 Failover#当其中一个节点关闭宕机时, the service in its node is transferred to another node.The swarm detects that the node1 fails and marks the state of the fault node as down; Docker node LS to see the status of Node1 downAt the same time Swarm will dispatch the service on the Node1 to other resource nodes to run; Docker service PS Web_server to see its process and status#访问server#便于分析, redeploy aDocker Service Create--name=htdocs_nginx--replicas=3 NginxDoc

The role switching between the Data guard master and slave libraries is divided into the following two types:1) SwitchoverSwithchover are usually man-made, planned role-swapping, such as upgrades. It is usually lossless, i.e. there is no data loss. Its implementation is mainly divided into two phases:1.Primary converted to Standby2.Standby (one) converted to primary2) FailoverFailover refers to the fact that standby has to act as a primay role due to primary failure, which is likely to result in

Windows Fail-over Clustering is very useful for servers fail over, when configuring this function some common issues we mi Ght Encounter, I shared the solutions as follows:1) Cluster quorum setting cannot be successful.Most likely, it's due to access permission of the 3th share folders. We need to check whether the target folder permission includes all the related machine name (especially the fail over Clust ER name). As the sample below, configure all the related nodes has full Control authorit

Keepalived VIP automatic failover Keepalived: 1. The keepalived process is stopped. 2. track_script detection failed in keepalived. Haproxy Detection: Vrrp_script chk_haproxy {Script "killall-0 haproxy" # cheaper than pidofInterval 2 # check every 2 secondsWeight-2} Switch related logs: tail-f/var/log/messages Keepalived_vrrp [1, 32408]: VRRP_Script (chk_haproxy) failedKeepalived_vrrp [32408]: VRRP_Instance (VI_1) initialized ed higher prio advertKeep

Redis Sentinel Master-Slave Switching (failover) solution, detailed configuration Author: oyhk 2013-10-10 23:55:49 0 Reviews 629 views Redis Source Learning notes Master-slave replication Blog Category:Redis Redis C Redis Source Learning notes article List Because the picture is larger and the zoom is blurred, double-click to open the View ^_^ Master-slave replication is simply to synchronize data from one Redis database to another Redis database,

performance of Master is not good enough, you can use a new powerful enough machine first as slave, and then all the system downtime maintenance, then the slave into master, all services use the new master to continue to work. The conversion from this master to the replica set is then started. The advantage is that the downtime can be relatively short. Disadvantages ... The service was interrupted ... In addition, all systems point to the new master when the scale of the system may be modified

address in DNSThen switch to the WINS tab: Uncheck: Enable LMHOSTS lookup, disable the NetBIOS feature on TCP/IP, confirmThen change the network priority order;In a network connection----Click organize----TICK menu----advanced----Local Area Connection priority higher than heartbeat lineSecond HSR2 Configure the heartbeat line to open the VM virtual machine configurationThe steps are set in the same way as the first one, exceptConfigure heartbeat Address: 100.100.100.2 255.255.255.0; no need to

Slave status\g ' |grep "Slave_io_running" | awk ' {print $} ')slave_sql_running=$ (MYSQL-U$USER-P$PASSWORD-E ' show Slave status\g ' |grep "Slave_sql_running" | awk ' {print $} ')echo "plese fix the server of $IP error now!" > $mysql _path/letterletter= $mysql _path/letterMYSQL-P$PASSWORD-E "Use test;"if [[$?! = 0]]ThenMail-s "{$ip}_database connect lost the srcprits fix It Now"$email Killall-9 HeartbeatKillall-9 mysqld/etc/init.d/mysqld startSleep $sleeptimeMYSQL-P$PASSWORD-E "Use test;"If [$?

: -: GenevaINFO [7f2cb44a4700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: -: atINFO [7f13125a2700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: -: atINFO [7f2816b4a700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: at:WuyiINFO [7fec2b5f4700] [routing:failover] listening on0.0.0.0:7001; read-Write .- to- - A: -:GenevaINFO [7ff971019700] [routing:failover] listening on0.0.0.0:7001; read-write [[email protected] bin]# MySQL-U

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Copy codeThe Code is as follows:# Coding: UTF-8Import socketImport selectImport timeImport OSImport threading Def ser ():S = socket. socket (socket. AF_INET, socket. SOCK_DGRAM)S. bind ("", 43244 ))While 1:Infds, outfds, errfds = select. select ([s], [], [], 5)If infds:Sms = s. recv (1024)If sms = "alived ":Print "peer is alived"Else:Print "Can't hear peer! "OS. system ("./failover. sh ") Def clt ():While 1:Sock = socket. socket (socket. AF_INET, sock