执行 memcached 启动命令时，报错，提示：error while loading shared libraries: libevent-2.1.so.6: cannot open shared object file: No such file or directory

查看 memcached 命令缺失什么库
ldd /usr/local/memcached/bin/memcached

ldd /usr/local/memcached/bin/memcached

结果： libevent-2.1.so.6 模块找不到

查看 libevent-2.1.so.6 是否存在
locate libevent-2.1.so.6

locate libevent-2.1.so.6

结果： 系统已经安装了该模块，在路径 /usr/local/lib/

查看 memcached 查找依赖库的路径
LD_DEBUG=libs /usr/local/memcached/bin/memcached -v

LD_DEBUG=libs /usr/local/memcached/bin/memcached -v

结果： 在 /lib64/ 目录中查找，所以找不到已经安装好的

映射 libevent-2.1.so.6 到 /lib64 路径中
ln -s /usr/local/lib/libevent-2.1.so.6 /usr/lib64/libevent-2.1.so.6

ln -s /usr/local/lib/libevent-2.1.so.6 /usr/lib64/libevent-2.1.so.6

结果：这样处理后，memcached就可以搜索到该文件了

启动memcached服务
/etc/init.d/memcached restart

/etc/init.d/memcached restart

此处会略有不同，因为提前已经安装了memcache开机启动脚本

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