memcached 入门介绍

83530391 2011-06-17

文献引用---memcached入门:

http://blog.sina.com.cn/s/blog_62c5a4810100ndl5.html

在linux上安装memcached

由于memcached安装时,需要使用libevent类库,所以先安装libevent

libevent下载网址:http://www.monkey.org/~provos/libevent/

本手册中下载的是libevent-1.4.8-stable.tar.gz版本安装步骤如下:

1.解压缩

tarxzfvlibevent-1.4.8-stable.tar.gz

2.进入到libevent-1.4.8-stable目录

cdlibevent-1.4.8-stable

3.编译,安装

./configure

make

makeinstall

注:默认安装到/usr/local/lib/目录

接下来,安装memcached

memcached下载网址:http://www.danga.com/memcached/download.bml

本手册中下载的是memcached-1.2.6.tar.gz版本

安装步骤如下:

1.解压缩

tarxzfvmemcached-1.2.6.tar.gz

2.进入到memcached-1.2.6目录

cdmemcached-1.2.6

3.编译,安装

./configure--prefix=/local/memcached

make

makeinstall

安装完成后,会在/local/memcached出现bin和share目录

进行bin目录,启动memcache

方法如下:

./memcached-d-unobody-m512127.0.0.1-p11211

此时,会报一个异常

errorwhileloadingsharedlibraries:libevent-1.4.so.2:cannotopensharedobjectfile:Nosuchfileordirectory

原因是找不到libevent-1.4.so.2类库,解决办法如下:

使用LD_DEBUG=help./memcached-v来确定加载的类库路径,方法如下:

LD_DEBUG=libs./memcached-v2>&1>/dev/null|less

则系统会显示:

linux:/local/memcached/bin#LD_DEBUG=libs./memcached-v2>&1>/dev/null|less

20421:findlibrary=libevent-1.4.so.2;searching

20421:searchcache=/etc/ld.so.cache

20421:searchpath=/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(systemsearchpath)

20421:tryingfile=/lib/tls/i686/sse2/libevent-1.4.so.2

20421:tryingfile=/lib/tls/i686/libevent-1.4.so.2

20421:tryingfile=/lib/tls/sse2/libevent-1.4.so.2

20421:tryingfile=/lib/tls/libevent-1.4.so.2

20421:tryingfile=/lib/i686/sse2/libevent-1.4.so.2

20421:tryingfile=/lib/i686/libevent-1.4.so.2

20421:tryingfile=/lib/sse2/libevent-1.4.so.2

20421:tryingfile=/lib/libevent-1.4.so.2

20421:tryingfile=/usr/lib/tls/i686/sse2/libevent-1.4.so.2

20421:tryingfile=/usr/lib/tls/i686/libevent-1.4.so.2

20421:tryingfile=/usr/lib/tls/sse2/libevent-1.4.so.2

20421:tryingfile=/usr/lib/tls/libevent-1.4.so.2

20421:tryingfile=/usr/lib/i686/sse2/libevent-1.4.so.2

20421:tryingfile=/usr/lib/i686/libevent-1.4.so.2

20421:tryingfile=/usr/lib/sse2/libevent-1.4.so.2

20421:tryingfile=/usr/lib/libevent-1.4.so.2

20421:

./memcached:errorwhileloadingsharedlibraries:libevent-1.4.so.2:cannotopensharedobjectfile:Nosuchfileordirectory

我们看到,memcached会到很多地方去找,所以根据其它求,我们只需建一个软链接,指定到我们安装的类库上即可

方法如下:

ln-s/usr/local/lib/libevent-1.4.so.2/lib/libevent-1.4.so.2

现在可以正常启动memcached了

./memcached-d-unobody-m512127.0.0.1-p11211

到这里,看到memcached已经启动,说明安装成功。

memcache启动参数说明:

Theoptionsformemcachedare:

-l<ip_addr>

Listenon<ip_addr>;defaulttoINDRR_ANY.Thisisanimportantoptiontoconsiderasthereisnootherwaytosecuretheinstallation.Bindingtoaninternalorfirewallednetworkinterfaceissuggested.

-d

Runmemcachedasadaemon.

-u<username>

Assumetheidentityof<username>(onlywhenrunasroot).

-m<num>

Use<num>MBmemorymaxtouseforobjectstorage;thedefaultis64megabytes.

-M

Insteadofthrowingitemsfromthecachewhenmaxmemoryisreached,throwanerror

-c<num>

Use<num>maxsimultaneousconnections;thedefaultis1024.

-k

Lockdownallpagedmemory.Thisisasomewhatdangerousoptionwithlargecaches,soconsulttheREADMEandmemcachedhomepageforconfigurationsuggestions.

-p<num>

Listenonport<num>,thedefaultisport11211.

-r

Maximizecorefilelimit

-M

Disableautomaticremovalofitemsfromthecachewhenoutofmemory.Additionswillnotbepossibleuntiladequatespaceisfreedup.

-r

Raisethecorefilesizelimittothemaximumallowable.

-h

Showtheversionofmemcachedandasummaryofoptions.

-v

Beverboseduringtheeventloop;printouterrorsandwarnings.

-vv

Beevenmoreverbose;sameas-vbutalsoprintclientcommandsandresponses.

-i

Printmemcachedandlibeventlicenses.

-P<filename>

Printpidfileto<filename>,onlyusedunder-doption.

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