postgresql ha

Can be opened ha is very convenient, in the case of the host itself broken out of the virtual function of their own floating to live on the machine and was running, but if the manual need to shut down the virtual machine in this case, the virtual opportunity to "revive" even if we choose to shutdown. In this case, you need to modify the HA restart policy in the properties of the virtual machine. Figure

PostgreSQL tutorial (13): database management details, postgresql details I. Overview: A database can be considered as a name set of an SQL object (database object). Generally, each database object (table, function, etc.) belongs to only one database. However, for some system tables, such as pg_database, it belongs to the entire cluster. More accurately, a database is a set of patterns, and a schema contain

to re-compile and run it. Online debugging cannot be performed during running, but logs can only be played. In view of the above problems, we finally gave up. However, if you use gdb for debugging in linux, you cannot hold it. So use eclipse. Reference: http://wiki.postgresql.org/wiki/Working_with_Eclipse [1] My system environment: Centos6.4 _ x64 Gcc.4.4.7 Eclipse-c/c ++ kepler Postgresql 9.3 The following is my configuration process:1. install ne

MASTER #辅改成BACKUPInterface eth0VIRTUAL_ROUTER_ID 51Priority #辅改成50Advert_int 1Authentication {Auth_type PASSAuth_pass 1111}virtual_ipaddress {192.168.6.105}}Service keepalived StartWeb:mount-t NFS 192.168.6.105:/home/shares/shares4.ssh Password-Free loginSsh-keygenSsh-copy-id5.shell ScriptCd/etc/keepalivedVim notify_master.sh #判断NFS端口是否存在, stop keepalived service if not present#!/bin/bashport= ' Netstat-anp|grep 2049 'If ["$port" = = ""];then/sbin/service keepalived StopFiVim change.sh (require

indicates that the queue is empty, head==tail indicates that the queue is full when the insert operation is performed. Supposedly, tail should be written as tail=0 at initialization, but this will cause the while condition to be out of order and therefore set the tail=size, but the cost is to say that the new team's first element is always labeled with the A[tail% size] when it is added to the end of the team. Of course, we can also use the do-while structure to solve this problem.1 voidDecodei

]# curl-xlocalhost:80www.123.comMaster[Email protected] vhosts]# curl-xlocalhost:80www.123.comSlave[Email protected] vhosts]# curl-xlocalhost:80www.123.comMaster[Email protected] vhosts]# curl-xlocalhost:80www.123.comMaster650) this.width=650, "style=" Border-bottom: #ddd 1px solid;border-left: #ddd 1px solid;background:url ("/e/u261/lang/ Zh-cn/images/localimage.png ") no-repeat Center 50%;border-top: #ddd 1px solid;border-right: #ddd 1px solid;" alt= " Spacer.gif "src="/e/u261/themes/default/i

Java API Connection HDFS HA Copy Code code as follows: public static void Main (string[] args) { Configuration conf = new Configuration (); Conf.set ("Fs.defaultfs", "Hdfs://hadoop2cluster"); Conf.set ("Dfs.nameservices", "Hadoop2cluster"); Conf.set ("Dfs.ha.namenodes.hadoop2cluster", "nn1,nn2"); Conf.set ("Dfs.namenode.rpc-address.hadoop2cluster.nn1", "10.0.1.165:8020"); Conf.set ("Dfs.namenode.rpc-address.hadoop2cluster.nn2", "10.0.

X Edit Hdfs-site.xml Add the following configuration Edit Core-site.xml Modify access to Hdfs://albert-that is, nameservices SCP./* root@node3:/opt/hadoop-2.5.1/etc/hadoop/ Configuring the HADOOP environment variable export hadoop_home=/opt/hadoop-2.5.1 Exportpath= $PATH: $HADOOP _home/bin: $HADOOP _home/sbin Start Journalnode hadoop-daemon.sh start Journalnode Be sure to execute this command before the Namenode format 5. Format

Tags: control its Enterprise-class student environment RBD case art01-Enterprise-Class practical case -20t above level data migration demo _101-Enterprise-Class practical case -20t above level data migration demo _202-Enterprise-Class case -20t above level data migration impressions03-Enterprise-Class case -20t above level data migration answers student questions04-Commissioning heartbeat to normal environment preparationThe principle of 05-heartbeat control DRBD and its practical in-depth expla

Configuration Description: 1. iSCSI shared storage via Openfiler 2. Implement fence functionality through VMware ESXi5 virtual fence. 3. Combine Redhat 5.8 vmware-fence-soap to realize RHCs fence equipment function. 4. This article was originally created to build RHCS experimental environment test RHCs Oracle ha function. This article link: http://koumm.blog.51cto.com/703525/1161791 I. Preparation of the basic environment 1. Network Environment

Tags: conversion top trample admin nod Force operation ADO DfsError:No obvious errorCondition:All Namenode are standby, that is, the ZK service is not in forceTry one: Manually force the conversion of a namenode to activeAction: On a namenode, perform hdfs haadmin-transitiontoactive--forcemanual nn1 (nn1 is one of your nameservice-id)Result: Nn1 was successfully converted to active. But after stop-dfs.sh again start-dfs.sh, all Namenode are still standbyConclusion: It is the problem of ZKTry two

, ' dd-mon-rr hh24:mi:ss ') Start_time,item,sofar from v$recovery_progress where item in (' Active Apply rate ', ' Average Apply rate ', ' Redo applied ');2, real-time synchronization log View/ruiy/ocr/dbsoftware/app/oracle/diag/rdbms/dg1/dg/trace/alert_dg.log3, the following query before and after switching on the main and standby to check the archive log transfer from the main library to the standby librarySELECT sequence#,applied from V$archived_log ORDER by sequence#;Oracle Dataguard

=" Https://s3.51cto.com/oss/201711/08/b2b920be25640d137afc4af6d3842d01.png "title=" Ka1.png "alt=" B2b920be25640d137afc4af6d3842d01.png "/>650" this.width=650; "src=" https://s4.51cto.com/oss/ 201711/08/5faa644154bd01ba997dddae3730f006.png "title=" Ka2.png "alt=" 5faa644154bd01ba997dddae3730f006.png "/>It is important to note that keepalived is preemption mode by defaultThe difference between the configuration files of the two schedulers is in the part of instance 1DR2 status for backup priority

mandatory:ms_mystor:promote mydata:start #定义顺序约束 Mount the file system when DRBD switches to master Ordermysql_after_mydatamandatory:mydata :startmysql:start #定义顺序约束, MySQL does not start after file system mount is complete650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/6D/ED/wKiom1VvA9LAh5ezAAGLX0v8Adw208.jpg "title=" image 0603.jpg "alt=" Wkiom1vva9lah5ezaaglx0v8adw208.jpg "/>650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6D/ED/wKiom1VvBFbyf2wXAAL_0PLfqTc048.jpg "title

Postgresql C/C ++ API and postgresql sqlapi 1. postgresql learning uri recommendation http://www.php100.com/manual/PostgreSQL8/ http://www.php100.com/manual/PostgreSQL8/reference.html http://www.yiibai.com/html/postgresql/ [Note tips byRuiy, distinguish uri/url, service/server,There has a certain truthChillax!] Frie

2.4 Adjusting checkpoints and xlogSo far, this chapter has provided insight into how PostgreSQL writes data, in general, what Xlog is used for. Given this knowledge, we can now continue and learn what we can do to make our databases work more efficiently in both replication and single-server operations.2.4.1 Understanding CheckpointsIn this chapter, we have seen that it has been written to Xlog before the data can be elsewhere. The problem is that if

PostgreSQL tutorial (18): client commands (2), postgresql tutorial VII. pg_dump: Pg_dump is a tool used to back up PostgreSQL databases. It can even perform a full and consistent backup when the database is being used concurrently without blocking access to the database by other users. The dump format generated by this tool can be divided into two types: script a

backup node to change two parameters, state to backup, priority 80Detailed parameters:Vrrp_instance Vi_1: Instance is represented by vrrp_instance, followed by instance nameState: The role used to specify Keepalived (MASTER or BACKUP)Interface: interface for specifying an HA monitoring networkVRITUAL_ROUTER_ID: is a virtual route identity, which is a number that is unique in the same instance and is consistent with the master and backup identitiesPri

ActiveMQ HA solution based on shared file system ActiveMQ HA solution based on shared file system Configure NFS server Yum install nfs-utils rpcbind Set the shared directory and edit/etc/exports /Home/mq1_data 192.168.41.199 (rw, sync, no_root_squash)/Home/mq1_data 192.168.41.199 (rw, sync, no_root_squash) Start the NFS server Service rpcbind startChkconfig rpcbind onService nfs startConfigure NFS client Yu

[Paid for help] If you are familiar with servers and HA users, please refer to the Linux Enterprise Application-Linux server application information. The following is a detailed description. The company has a project that requires dual-host hot standby, The hardware is configured with the same HP DL380 (5cpu) PCSERVER, Software environment: LINUX operating system, data interface software A (developed in JAVA, its main function is to read data throug