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Nodejs file and file operations (read/write file deletion and rename)

{Console. log ("folder a does not exist ")}}); -----------------------------[Note: Then call the callback argument with either true or false(The value of this callback function is true or false)] [File type determination] [fs. stat (), fs. lstat () and fs. fstat ()]// Stat. js----------------------------- The Code is as follows: Copy code Var fs = require ("fs ");// Obtain the type of the folderFs. stat ("C: a", function (err, stat ){If (err ){Console. log ("the f

?? Twemproxy Redis ttserver phpadmin memcache

:1024Auto_eject_hosts:trueserver_retry_timeout:3000Server_failure_limit:3Servers-10.10.42.93:1978:1-10.10.42.93:2978:1-10.10.42.93:3978:1-10.10.42.93:4978:1start the Twemproxy service Nutcracker- TTest configuration File Nutcracker- D - C /Usr/Src/Twemproxy/Conf/Nutcracker.yml- P /Usr/Src/Twemproxy/Run/Redisproxy.pid- o /Usr/Src/Twemproxy/Run/Redisproxy.log Nutcracker Usage and command options Usage:nutcracker [-?HVDDT] [-v verbosity level] [-O output file][-

Evolution of large-scale Web Site system Architecture (iv) The Haproxy practice of HTTP Layer load balancing (i)

option forwardfor option Redispatch log127.0.0.1Local3 Retries3Maxconn32000balance Roundrobin stats URI/haproxy-Stats Contimeout theClitimeout50000Srvtimeout50000Listen Web_proxy*: theappsession Jsessionid Len theTimeout 3h #插入cookie的方式 cookie SRV Insert indirect nocache #模式有http TCP Health mode HTTP Stats Enable stats

Haproxy Configuration support HTTPS get User IP address

GlobalLog127.0.0.1local0 chroot/var/lib/haproxy #chroot运行路径 pidfile/var/run/haproxy.pid #haproxy Process pid file Maxconn65535#默认最大连接数, you need to consider ulimit-N Limit user haproxy group Haproxy daemon #以后台形式运行harpoxy tune.s SL. default-dh-param 2048 SSL-server- Verify none stats socket/var/lib/haproxy/statsdefaults option forwardfor option httpclose option do Ntlognull #不记录健康检查日志信息 Option Redispatch #当serverId对应的服务器挂掉后, Force-di

Solution to the problem of expdp error ORA-7445 in oracle

A customer said a set of databases due to abnormal shutdown after the data export found error, EXPDP can not work correctly, after the error directly exit: Working with Object Types Schema_export/job. . The "STATS" was exported. T_report_month_temps "988.2 MB 1292221 LinesORA-39014: One or more worker processes have exited prematurely.Ora-39029:worker Process 1 (Process name "DW01") prematurely terminatedOra-31672:worker process DW01 stopped unexpect

Use C # To implement automatic dialing for ADSL

;Lpcb = marshal. sizeof (typeof (rasconn )); Nret = RAS. rasenumconnections (ref lprasconn, ref lpcb, refLpcconnections ); If (nret! = 0){M_connected = false;Return; } If (lpcconnections> 0){// For (INT I = 0; I //{Rasstats stats = new rasstats (); M_connectedrashandle = lprasconn. hrasconn;RAS. rasgetconnectionstatistics (lprasconn. hrasconn, stats ); M_connectionname = lprasconn. szentrynam

Original: Twemproxy source analysis of the second Nc_run

assigns a value to the CF variable in CTX. The NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;CF variable is of type Conf. The reason for this type is that the function used by the operation and the results obtained after parsing are included in the structure. Conf_create sets the function pointers and parsing types in CF first, then processes them, and finally saves the processed results in the ARG array of the Conf struct. Note: The contents of the last configuration file are all contained in the ARG arr

Ubuntu + haproxy + keepalived master load

://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.24.tar.gz Tar xf haproxy-1.4.24.tar.gz cd haproxy-1.4.24 view ubuntu version info: uname-a display: linux ubuntu37 3.2.0-51-generic # 77-Ubuntu SMP Wed Jul 24 20:18:19 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux make TARGET = 37-ubuntu make PREFIX =/usr/local/haproxy install create haproxy user useradd haproxy 2. edit haproxy. cfg mkdir/etc/haproxy vi/etc/haproxy. cfg ######## haproxy. cfg ######## global log quota local0 maxconn 51200 user haproxy grou

Build a comet application with mochiweb to accommodate millions of users (1)

, u} end, wait) end ), Recv ({0, 0 }). Recv (Stats)-> {Active, closed, Chunks} = stats, Receive {Stats}-> IO: Format ("stats :~ W/N ", [stats]) After 0-> Noop End, Receive {HTTP, {_ ref, stream_start, _ x }}-> Recv ({active + 1, closed, Chunks }); {Htt

Use C # To implement automatic ADSL dialing (Principles and closed classes)

){// For (int I = 0; I //{RasStats stats = new RasStats ();M_ConnectedRasHandle = lprasConn. hrasconn;RAS. RasGetConnectionStatistics (lprasConn. hrasconn, stats ); M_ConnectionName = lprasConn. szEntryName;Int Hours = 0;Int Minutes = 0;Int Seconds = 0;Hours = (stats. dwConnectionDuration/1000)/3600 );Minutes = (stats.

Memcached Installation Guide (Linux)

the memcache process. # Kill CAT/tmp/memcached. pid6. monitor whether the startup is successful. cmdc: \> Telnet 192.168.160.129 11211 directly hitting stats command 7. Set the Telnet access limit for memcache. Set the Telnet access limit, common concepts that enable memcached to access memcache only on transit hosts. memcached allocates memory in advance. The memory allocation method of memcached is called allocator. First, there are three concepts:

Winform C # dialing program code

;Private bool m_connected;Private intptr m_connectedrashandle; Public rasdisplay (){M_connected = true; Ras lpras = new RAS ();Rasconn lprasconn = new rasconn (); Lprasconn. dwsize = marshal. sizeof (typeof (rasconn ));Lprasconn. hrasconn = intptr. zero; Int lpcb = 0;Int lpcconnections = 0;Int nret = 0;Lpcb = marshal. sizeof (typeof (rasconn )); Nret = RAS. rasenumconnections (ref lprasconn, ref lpcb, refLpcconnections ); If (nret! = 0){M_connected = false;Return;} If (lpcconnections

Leveldb source code analysis-16

the binary lookup algorithm. The code is no longer listed.10.4 version: Get () The search function is called directly in dbimpl: Get (). The function prototype is:Status version: Get (const readoptions options, constlookupkey K, STD: string * value, getstats * stats)If this get operation contains more than one seek file (only at level 0), the first file to be searched is saved in stats. If stat returns d

Linux (CentOS)-haproxy installation and configuration

记录健康检查的日志信息 Option Httpclose # # #每次请求完毕后主动关闭http通道 Option Httplog # # #日志类别http日志格式 Option Forwardfor # # #如果后端服务器需要获得客户端真实ip需要配置的参数, you can get the client IP from the HTTP header Option Redispatch # # #serverId对应的服务器挂掉后, force directed to other healthy servers timeout connect10000#default TenSecond timeoutifA backend isNot found timeout client300000# # #客户端连接超时 Timeout Server300000# # #服务器连接超时 Maxconn60000# # #最大连接数 Retries3# # #3次连接失败就认为服务不可用, you can also set ##########################

Memcache command-line Operations

Looking for a long time today, how to see the value of Memcache directly in the server, to determine whether PHP Memcache has been written in theHttps://www.ttlsa.com/memcache/memcache-list-all-keys/This method is not only applicable to windowns cmd. Also applies to Linux command line operations, the following is the specific contentToday is doing a memcache session test, but in the process of testing, found that memcache there is no relatively simple way to directly like Redis, keys * List all

Parsing Linux Install Memcacheq (MCQ) Full process notes

-S -A -L -D Daemon -r maximize core file limit -u -C -v Verbose output (print errors/warnings while in Eve NT loop) -VV more verbose output (also print client commands/reponses) -i print license information -P -T --------------------BerkeleyDB Options------------------------------- -M -A -H -l -C -T -s -e -e -b -D -N opens Db_txn_nosync for significant performance improvements, the default is off -R automatically deletes log files that are no longer needed, default is off test Third, testi

Resolution of ORA-01631 errors in ORACLE 8i

Recently used Statspack on a customer's 8i production library and found an error in alert: Mon June 16 13:17:52 2014 Errors in FILE/ORACLE/8.1.7/ADMIN/PROD/BDUMP/SNP0_96626_PROD.TRC: Ora-12012:error on Auto execute of Job 304 Ora-01631:max # Extents (505) reached in table Perfstat. Stats$sql_summary Ora-06512:at "Perfstat. Statspack ", line 978 Ora-06512:at "Perfstat. Statspack ", line 1612 Ora-06512:at "Perfstat. Statspack ", line 71 Ora-0651

Oracle's automated collection of statistical information

Label:One, Oracle 11gThe automatic collection of statistics data is available in the 11g version of Oracle. One of the steps in deploying 11g Oracle software during deployment is to prompt for the ability to start this feature (which is enabled by default).Here's how to enable and disable this feature:1. View the tasks and status of automatically collecting statistics:Sql> select Client_name,status from Dba_autotask_client; Client_name STATUS ------------------------------------

SQL Server understands Copyonly backup operations

Tags: relational database int operation buffer full City bak body detailed description nloadTags: mssql/log truncation OverviewAlwaysOn in the process of adding a database, if the Sync preferences select "Full", then the full and log backups of copyonly are performed on the primary replica to perform the restore operation on the secondary replica, and it is this operation that gives me a new understanding of copyonly. Although you used to perform a full backup with Copyonly,But the previous unde

Use C # To implement automatic dialing for ADSL

! = 0){M_connected = false;Return;}If (lpcconnections> 0){// For (INT I = 0; I //{Rasstats stats = new rasstats ();M_connectedrashandle = lprasconn. hrasconn;RAS. rasgetconnectionstatistics (lprasconn. hrasconn, stats ); M_connectionname = lprasconn. szentryname;Int hours = 0;Int minutes = 0;Int seconds = 0;Hours = (stats. dwconnectionduration/1000)/3600 );Minute

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