Shulou(Shulou.com)06/03 Report--

Memcached has been popular for many years, and now there are quite a lot of resources about memcached on the Internet, so I won't waste my words. Simply write an actual combat series and insist on talking about everything with implementation.

Environment introduction

Linux virtual machine

Kernel information

[root@hadoop1] # uname-a

Linux hadoop1 2.6.32-358.el6.i686

Memory: 1G

Installation process

1. Prepare to compile the environment, install the necessary gcc,make tools, if you do not have yum installed, it is best to install. There are many shared yum sources online.

two。 Download the latest version of libevent

# wget https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz

3. Decompress the libevent corresponding compressed package

# tar zxvf libevent-2.0.22-stable.tar.gz

Unzipped file path: / u01/software/libevent-2.0.22-stable

3. Compile libevent

$cd / u01According to SoftwareAccord LibeventMurray 2.0.22 configure stable $. / configure-prefix=/usr/local/libevent$ make$ make install confirm the installation result $ls-al/ usr/local/lib | grep libevent

4. Download the latest version of memcached

$wget http://memcached.org/latest

5. Decompress the memcached corresponding compressed package

$tar zxvf memcached-1.4.29.tar.gz

Unzipped file path: / u01/software/memcached-1.4.29

6. Compile memcached

$cd / u01/software/memcached-1.4.29 $[root@hadoop1 memcached-1.4.29] #. / configure-help`configure 'configures memcached 1.4.29 to adapt to many kinds of systems.Usage:. / configure [OPTION]. [VAR=VALUE]... Configuration:-h,-help display this help and exit-- help=short display options specific to this package-- help=recursive display the short help of all the included packages-V,-- version display version information and exit-Q,-- quiet,-- silent do not print `checking...' Messages-- cache-file=FILE cache test results in FILE [disabled]-C,-- config-cache alias for `--cache-file=config.cache'-n -- no-create do not create output files-- srcdir=DIR find the sources in DIR [configure dir or `..'] Installation directories:-- prefix=PREFIX install architecture-independent files in PREFIX [/ usr/local]... Fine tuning of the installation directories:-- bindir=DIR user executables [EPREFIX/bin]-- sbindir=DIR system admin executables [EPREFIX/sbin]- -libexecdir=DIR program executables [EPREFIX/libexec]-- sysconfdir=DIR read-only single-machine data [PREFIX/etc]-- sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]-- localstatedir=DIR modifiable single-machine data [PREFIX/var]-- libdir=DIR object code libraries [EPREFIX/lib]-includedir=DIR C header files [PREFIX/include]-- oldincludedir=DIR C header files for non-gcc [/ usr/include]-- datarootdir=DIR Read-only arch.-independent data root [PREFIX/share]-- datadir=DIR read-only architecture-independent data [DATAROOTDIR]-- infodir=DIR info documentation [DATAROOTDIR/info]-- localedir=DIR locale-dependent data [DATAROOTDIR/locale]-- mandir=DIR man documentation [DATAROOTDIR/man]-docdir=DIR documentation root [DATAROOTDIR/doc/memcached]-- htmldir=DIR html documentation [DOCDIR]-- dvidir=DIR Dvi documentation [DOCDIR]-- pdfdir=DIR pdf documentation [DOCDIR]-- psdir=DIR ps documentation [DOCDIR] Optional Packages:-- with-PACKAGE [= ARG] use PACKAGE [ARG=yes]-- without-PACKAGE do not use PACKAGE (same as-- with-PACKAGE=no)-- with-libevent=PATH Specify path to libevent installation # / configure-- prefix=/usr/local/memcached-- with-libevent=/usr/local/lib/ # make # make install

At this time, memcached was successfully installed.

Start memcached

$/ usr/local/memcached/bin/memcached reported an error

Error while loading shared libraries: libevent-2.0.so.5: cannot open shared object file: No such file or directory

Solution idea

# # tracking the path of running all loaded library files in memcached

$LD_DEBUG=libs LD_DEBUG=libs. / memcached-v 15862: find library=libevent-2.0.so.5 [0] Searching 15862: search cache=/etc/ld.so.cache 15862: search path=/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2:/lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686/sse2:/usr/lib/tls/i686:/usr/lib/tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2: / usr/lib/i686:/usr/lib/sse2:/usr/lib (system search path) 15862: trying file=/lib/tls/i686/sse2/libevent-2.0.so.5 15862: trying file=/lib/tls/i686/libevent-2.0.so.5 15862: trying file=/lib/tls/sse2/libevent-2.0.so.5 15862: trying file=/lib/tls/ Libevent-2.0.so.5 15862: trying file=/lib/i686/sse2/libevent-2.0.so.5 15862: trying file=/lib/i686/libevent-2.0.so.5 15862: trying file=/lib/sse2/libevent-2.0.so.5 15862: trying file=/lib/libevent-2.0.so.5...

First confirm the establishment of a soft connection

$ls / usr/local/lib/libevent-2.0.so.5/usr/local/lib/libevent-2.0.so.5$ ln-s / usr/local/lib/libevent-2.0.so.5/usr/ lib/i686/libevent-2.0.so.5

If you log in as a root user, you must specify the-u parameter

$/ usr/local/memcached/bin/memcached-u hadoop

Confirm whether memcached starts successfully

$ps-ef | grep memcachedhadoop 15891 4034 0 22:45 pts/4 00:00:00 / usr/local/memcached/bin/memcached-u hadooproot 15899 15561 0 22:45 pts/5 00:00:00 grep memcached# netstat-tlnp | grep memcachedtcp 00 0.0.0.0 grep memcachedhadoop 11211 0.0.0.0 LISTEN 15891/memcached tcp 00:: 11211:: * LISTEN 15891/memcached

Finally, telnet confirmed.

$telnet 127.0.0.1 11211Trying 127.0.0.1...Connected to 127.0.0.1.Escape character is'^] .statsSTAT pid 15891STAT uptime 86STAT time 1470494793

OK . So far, the memcached1.4.9 version has been successfully installed on the machine. Personally, the most troublesome thing is to deal with libevent.

The problem was solved only after referring to a lot of resources.

Memcached setup self-startup

For convenience, change the permissions of memcached execution now.

The simplest way to start

Just add a line to / etc/rc.d/rc.local

/ usr/local/memcached/bin/memcached-d-m 20-p 11211-u hadoop

Be careful

-d: set to background process

-u: point to the user

-p: Port

-m: memory

Recommended way

2.1. Copy the memcached.sysv of the memcached source package to / etc/init.d as the startup script for memcached

$cp / u01/software/memcached-1.4.29/scripts/memcached.sysv / etc/init.d/memcached [root@hadoop1 bin] # vi / etc/init.d/memcached #! / bin/sh## chkconfig:-55 4 hours description: The memcached daemon is a network memory cache service.# processname: memcached# config: / etc/sysconfig/memcached# Source function library.. / etc/rc.d/init.d/functionsPORT=11211USER=nobodyMAXCONN=1024CACHESIZE=64OPTIONS= "" if [- f / etc/sysconfig/memcached]; then. / etc/sysconfig/memcachedfi# Check that networking is up.if ["$NETWORKING" = "no"] then exit 0fiRETVALLOGO progression = "memcached" start () {echo-n $"Starting $prog:" # insure that / var/run/memcached has proper permissions chown $USER / var/run/memcached daemon memcached-d-p $PORT-u $USER-m $CACHESIZE-c $MAXCONN-P / var/run/memcached/memcached.pid $OPTIONS RETVAL=$? Echo [$RETVAL-eq 0] & & touch / var/lock/subsys/memcached} stop () {echo-n $"Stopping $prog:" killproc memcached RETVAL=$? Echo if [$RETVAL-eq 0]; then rm-f / var/lock/subsys/memcached rm-f / var/run/memcached/memcached.pid fi} restart () {stop start} # See how we were called.case "$1" in start) start;; stop) stop;; status) status memcached;; restart | reload) restart Condrestart) [- f / var/lock/subsys/memcached] & & restart | |:; *) echo $"Usage: $0 {start | stop | status | restart | reload | condrestart}" exit 1esacexit $?

Modify the following sentence (actually point the memcached command to our full path)

Daemon memcached-d-p $PORT-u $USER-m $CACHESIZE-c $MAXCONN-P / var/run/memcached/memcached.pid $OPTIONS

Daemon / usr/local/memcached/bin/memcached-d-p $PORT-u $USER-m $CACHESIZE-c $MAXCONN-P / var/run/memcached/memcached.pid $OPTIONS

Configure self-startup

[root@hadoop1 bin] $chkconfig memcached on [root@hadoop1 bin] $chkconfig | grep memcachedmemcached 0:off 1:off 2:on 3:on 4:on 5:on 6:off

Install nc

[root@hadoop1 yum.repos.d] $yum install nc

The stats command that comes with memcached is not very friendly to search. For a good search, with the help of nc tool.

For example, if you want to find parameters related to connection

[root@hadoop1 yum.repos.d] # echo stats | nc 127.0.0.1 11211 | grep connectionSTAT curr_connections 10STAT total_connections 13STAT connection_structures 11

With the use of nc, personal reference to online resources, a simple list

Watch "echo stats | nc 127.0.0.1 11211" printf "stats\ r\ n" | nc 127.0.0.1 11211echo stats | nc 127.0.0.1 11211

The End

Next, the walkthrough is to access memcachd. JAVA through the telnet command line and the JAVA client tool.

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