memcached 启动时出现error while loading shared libraries: libevent-1.4.so.2

执行

1. /usr/local/memcached/bin/memcached -m 512 -p 11211 -l 127.0.0.1 -d -u www

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时出现

1. /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

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先执行以下命令检查 memcached 是怎么查找 libevent-1.4.so.2 这个模块的

1. LD_DEBUG=libs /usr/local/memcached/bin/memcached -v 2>&1 > /dev/null | less

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出现

1. 18076:     find library=libevent-1.4.so.2 [0]; searching
   
2.      18076:      search cache=/etc/ld.so.cache
   
3.      18076:      search path=/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2:/lib/i686:/lib/sse2:/lib:/usr/li
   
4. b/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            
   
5. (system search path)
   
6.      18076:       trying file=/lib/tls/i686/sse2/libevent-1.4.so.2
   
7.      18076:       trying file=/lib/tls/i686/libevent-1.4.so.2
   
8.      18076:       trying file=/lib/tls/sse2/libevent-1.4.so.2
   
9.      18076:       trying file=/lib/tls/libevent-1.4.so.2
   
10.      18076:       trying file=/lib/i686/sse2/libevent-1.4.so.2
    
11.      18076:       trying file=/lib/i686/libevent-1.4.so.2
    
12.      18076:       trying file=/lib/sse2/libevent-1.4.so.2
    
13.      18076:       trying file=/lib/libevent-1.4.so.2
    
14.      18076:       trying file=/usr/lib/tls/i686/sse2/libevent-1.4.so.2
    
15.      18076:       trying file=/usr/lib/tls/i686/libevent-1.4.so.2
    
16.      18076:       trying file=/usr/lib/tls/sse2/libevent-1.4.so.2
    
17.      18076:       trying file=/usr/lib/tls/libevent-1.4.so.2
    
18.      18076:       trying file=/usr/lib/i686/sse2/libevent-1.4.so.2
    
19.      18076:       trying file=/usr/lib/i686/libevent-1.4.so.2
    
20.      18076:       trying file=/usr/lib/sse2/libevent-1.4.so.2
    
21.      18076:       trying file=/usr/lib/libevent-1.4.so.2
    
22.      18076:     
    
23. /usr/local/memcached/bin/memcached: error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: No such
    
24. file or directory

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按 q 退出查找

只要 trying file 里有一个存在即可。
发现系统里有 /usr/local/libevent/lib/libevent-1.4.so.2
做一个软链接过去

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

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ok，搞定，去启动 memcached 吧。