libeven、memcached、libmemcache安装
发布于 2007-12-21 19:31 1 阅读:96,627 评论:1 标签: libeven libmemcache Linux memcached 安装

    前端时间玩了一下memcached,由于工作关系得过一段时间在玩它。哎,工作就是这样,老变!

    libeven

    memcached的使用需要libeven的支持,我们得先装上libeven。
    官方网站:http://www.monkey.org/~provos/libevent/
    下载地址:http://www.monkey.org/~provos/libevent-1.4.0-beta.tar.gz
    libevent安装方式比较简单:

以下是代码片段:
./configure && make
make install
    这样就好

    检查如下:

以下是引用片段:
[root@localhost memcached-1.2.2]# ls -l /usr/local/lib/ | grep even
lrwxrwxrwx   1 root root      21 Nov 26 11:32 libevent-1.4.so.2 -> libevent-1.4.so.2.0.0
-rwxr-xr-x   1 root root  267334 Nov 26 11:32 libevent-1.4.so.2.0.0
-rw-r--r--   1 root root  351694 Nov 26 11:32 libevent.a
lrwxrwxrwx   1 root root      26 Nov 26 11:32 libevent_core-1.4.so.2 -> libevent_core-1.4.so.2.0.0
-rwxr-xr-x   1 root root  101485 Nov 26 11:32 libevent_core-1.4.so.2.0.0
-rw-r--r--   1 root root  139080 Nov 26 11:32 libevent_core.a
-rwxr-xr-x   1 root root     866 Nov 26 11:32 libevent_core.la
lrwxrwxrwx   1 root root      26 Nov 26 11:32 libevent_core.so -> libevent_core-1.4.so.2.0.0
lrwxrwxrwx   1 root root      27 Nov 26 11:32 libevent_extra-1.4.so.2 -> libevent_extra-1.4.so.2.0.0
-rwxr-xr-x   1 root root  214596 Nov 26 11:32 libevent_extra-1.4.so.2.0.0
-rw-r--r--   1 root root  273270 Nov 26 11:32 libevent_extra.a
-rwxr-xr-x   1 root root     873 Nov 26 11:32 libevent_extra.la
lrwxrwxrwx   1 root root      27 Nov 26 11:32 libevent_extra.so -> libevent_extra-1.4.so.2.0.0
-rwxr-xr-x   1 root root     831 Nov 26 11:32 libevent.la
lrwxrwxrwx   1 root root      21 Nov 26 11:32 libevent.so -> libevent-1.4.so.2.0.0

    看见有很多libevent,就可以放心了。

    memcached

    官方网站:http://www.danga.com/memcached/download.bml
    下载地址:http://www.danga.com/memcached/dist/memcached-1.2.2.tar.gz

    memcached安装需要些参数:

以下是代码片段:
./configure --prefix=/usr/local/memcached --with-libevent=/usr/local
make
make install

   我们来运行看看:
   运行:

以下是代码片段:
/usr/local/memcached/bin/memcached -d -m 10 -p 11211 -u root

    结果:
以下是引用片段:
[root@localhost memcached-1.2.2]# /usr/local/memcached/bin/memcached -d -m 10 -p 11211 -u root
/usr/local/memcached/bin/memcached: error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such file or directory

    查找原因,解决方案如下:

以下是代码片段:
LD_DEBUG=libs /usr/local/memcached/bin/memcached -v

    有如下显示:

以下是引用片段:
[root@localhost memcached-1.2.2]# LD_DEBUG=libs /usr/local/memcached/bin/memcached -v
     18999:     find library=libevent-1.4.so.2 [0]; searching
     18999:      search cache=/etc/ld.so.cache
     18999:      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)
     18999:       trying file=/lib/tls/i686/sse2/libevent-1.4.so.2
     18999:       trying file=/lib/tls/i686/libevent-1.4.so.2
     18999:       trying file=/lib/tls/sse2/libevent-1.4.so.2
     18999:       trying file=/lib/tls/libevent-1.4.so.2
     18999:       trying file=/lib/i686/sse2/libevent-1.4.so.2
     18999:       trying file=/lib/i686/libevent-1.4.so.2
     18999:       trying file=/lib/sse2/libevent-1.4.so.2
     18999:       trying file=/lib/libevent-1.4.so.2
     18999:       trying file=/usr/lib/tls/i686/sse2/libevent-1.4.so.2
     18999:       trying file=/usr/lib/tls/i686/libevent-1.4.so.2
     18999:       trying file=/usr/lib/tls/sse2/libevent-1.4.so.2
     18999:       trying file=/usr/lib/tls/libevent-1.4.so.2
     18999:       trying file=/usr/lib/i686/sse2/libevent-1.4.so.2
     18999:       trying file=/usr/lib/i686/libevent-1.4.so.2
     18999:       trying file=/usr/lib/sse2/libevent-1.4.so.2
     18999:       trying file=/usr/lib/libevent-1.4.so.2
     18999:
/usr/local/memcached/bin/memcached: error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such file or directory

    主要是看最后一行提示的错误,那么我们:

以下是代码片段:
ln -s /usr/local/lib/libevent-1.4.so.2 /usr/lib/libevent-1.4.so.2

    OK!再次运行:

以下是代码片段:
/usr/local/memcached/bin/memcached -d -m 10 -p 11211 -u root
    成功!

    貌似用“ldconfig”也可以解决这个问题

     libmemcache   

    libmemcache是memcached C的客户端之一。我准备使用这个玩意。
    官网:http://people.freebsd.org/~seanc/libmemcache/
    下载:http://people.freebsd.org/~seanc/libmemcache/libmemcache-1.4.0.rc2.tar.bz2
    编译:

以下是代码片段:
./configure
make
make install

     写一个有libmemcache函数的程序
     然后    

以下是代码片段:
gcc a.c -o a.cgi -L/usr/local/include -lmemcache


    运行

以下是代码片段:
./a.cgi

    提示类似上面的“error while loading shared libraries”的错误,查了一下可用"ldconfig"解决这个问题,那上面的可否用这个命令解决呢?

    上面的gcc编译的时候,带有参数“-lmemcache”。
    -l参数后面跟的库名有规则的,库的命名方式有libxxxx.so或libxxxx.a,编译时要用-lxxxx就可以了。
    而“-l”的意思就是代表是个“lib”了。

    所以在你自己编写动态库或者静态库时,命名还是得按照 libxxxx.so的形式来。

    不得不认为libmemcache有点糟糕,编译它自带的一个程序编译竟然有问题,很无语!

以下是引用片段:
[root@login benchmark]# gcc benchmark.c -L/usr/local/include -lmemcache
benchmark.c: In function `main':
benchmark.c:100: warning: passing arg 2 of `mc_set' discards qualifiers from pointer target type
benchmark.c:108: warning: passing arg 2 of `mc_set' discards qualifiers from pointer target type
benchmark.c:121: warning: passing arg 2 of `mc_req_add' discards qualifiers from pointer target type
benchmark.c:145: warning: passing arg 2 of `mc_delete' discards qualifiers from pointer target type
benchmark.c:153: warning: passing arg 2 of `mc_add' discards qualifiers from pointer target type
benchmark.c:167: warning: passing arg 2 of `mc_delete' discards qualifiers from pointer target type

    解决方法:

    找到passing arg 2这个参数的定义:

以下是引用片段:
const char *key;

    把const去了:
以下是引用片段:
char *key;

    这样就好了!

    然后:

以下是代码片段:
[root@login memcache-test]# ./a.out

    执行时可能报以下的错误:

以下是引用片段:
./a.out: error while loading shared libraries: libmemcache.so.0: cannot open shared object file: No such file or directory

    解决方法:

    执行ldconfig命令即可!


    附:

    http://kapoc.blogdriver.com/kapoc/1200549.html
    ldconfig命令 - - 动态链接库管理命令

    为了让动态链接库为系统所共享,还需运行动态链接库的管理命令--ldconfig.此执行程序存放在/sbin目录下.

    ldconfig命令的用途,主要是在默认搜寻目录(/lib和/usr/lib)以及动态库配置文件/etc/ld.so.conf内所列的目录下,搜索出可共享的动态链接库(格式如前介绍,lib*.so*),进而创建出动态装入程序(ld.so)所需的连接和缓存文件.缓存文件默认为/etc/ld.so.cache,此文件保存已排好序的动态链接库名字列表.

    ldconfig通常在系统启动时运行,而当用户安装了一个新的动态链接库时,就需要手工运行这个命令.

学学memcache

好教程~~

by ludonghai 2008-05-26 13:05:43
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