failover scenarios

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

#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,

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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memcached, Bela said: Server-side code (such as Servlets) running on JBoss or Tomcat clusters accesses a DB and needs caching to improve speed and avoid db bottlenecks. Other usage scenarios are similar, except that access is not db but file systems. For example, an HTML page caching server (squid immediately emerges in the mind). There is no plan to introduce memcached into the JBoss application server in the future. Of course. The data partition (p

Tags: future ogr section best bottleneck gzip diff combo AutoMySQL migration scenarios under different scenariosPosted in MySQL and tagged MySQL, data migration, scheme on Sep 15, 2015. viewd 2684 times. 文/温国兵A catalog A catalog Second why migrate Three MySQL migration Scenarios Overview Four MySQL Migration Combat 4.1 Scene one by one master one migration from the library f

Unity3d: dynamically add and create scenarios, and unity3d scenariosIn Unity3d, most scenarios (scene) are implemented by clicking add current IN build settings or dragging the scenario to the Panel. If this is not done, Your scenarios will not be loaded, even if you have an absolute path. That is to say, the number of scena