安装memcached:error while loading shared libraries: libevent-1.4.so.2

lchl0388

　　安装完memcached,启动时报错如下:
?/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　　首先确认是否已经安装了 libevent,Memcache用到了libevent这个库用于Socket的处理，所以需要安装libevent,默认是安装在 /usr/local/lib目录下的.
?# ls /usr/local/lib/libevent-1.4.so.2/usr/local/lib/libevent-1.4.so.2　　我们要知道memcached去是哪些目录查找libevent动态库的,这里用这个命令
?#LD_DEBUG=libs /usr/local/memcached/bin/memcached -v?29653: find library=libevent-1.4.so.2 [0]; searching29653: search cache=/etc/ld.so.cache29653: search path=/lib64/tls/x86_64:/lib64/tls:/lib64/x86_64:/lib64:/usr/lib64/tls/x86_64:/usr/lib64/tls:/usr/lib64/x86_64:/usr/lib64 (system search path)29653: trying file=/lib64/tls/x86_64/libevent-1.4.so.229653: trying file=/lib64/tls/libevent-1.4.so.229653: trying file=/lib64/x86_64/libevent-1.4.so.229653: trying file=/lib64/libevent-1.4.so.229653: trying file=/usr/lib64/tls/x86_64/libevent-1.4.so.229653: trying file=/usr/lib64/tls/libevent-1.4.so.229653: trying file=/usr/lib64/x86_64/libevent-1.4.so.229653: trying file=/usr/lib64/libevent-1.4.so.229653:/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　　先来看一下 LD_DEBUG=libs 这个是什么意思
?# LD_DEBUG=help lsValid options for the LD_DEBUG environment variable are: libs display library search pathsreloc display>files display progress for input filesymbols display symbol table processingbindings display information about symbol bindingversions display version dependenciesall all previous options combinedstatistics display>unused determined unused DSOshelp display this help message and exit To direct the debugging output into a file instead of standard outputa filename can be specified using the LD_DEBUG_OUTPUT environment variable.　　我们得知memcached查找动态库的位置是 /lib64 和 /usr/lib64/,所以我们只需把libevent-1.4.so.2 链接到这两个目录就可以了
?ln -s /usr/local/lib/libevent-1.4.so.2 /usr/lib64/libevent-1.4.so.2　　ok .