介绍
memcachefs是基于FUSE的memcached文件系统，将memcache服务挂载到本地。允许查看缓存中的数据，就好像是磁盘上的文件。memcache的操作都将转换成针对普通文件般的操作。
项目地址：http://memcachefs.sourceforge.net/
使用场景
基于本地磁盘缓存文件都可以用memcachefs来实现，效率上比磁盘更强大。。比如session文件等等。 如果先前的session信息就存在本地磁盘上，可以直接将memcache挂载到当前session目录上，无需更改程序，完美解决。
安装
1.安装依赖(使用root安装)
依赖
-
FUSE 2.5 or later
-
libmemcache 1.4 or later
a)安装fuse-2.9.3.tar.gz
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cd
/tmp
wget http:
//hivelocity
.dl.sourceforge.net
/project/fuse/fuse-2
.X
/2
.9.3
/fuse-2
.9.3.
tar
.gz
tar
zxvf fuse-2.9.3.
tar
.gz
cd
fuse-2.9.3
.
/configure
make
make
install
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b)挂载fuse内核模块
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modprobe fuse
lsmod |
grep
"fuse"
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c)安装libmemcache-1.4.0.rc2.tar.bz2
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cd
/tmp
wget http:
//people
.freebsd.org/~seanc
/libmemcache/libmemcache-1
.4.0.rc2.
tar
.bz2
tar
xvf libmemcache-1.4.0.rc2.
tar
.bz2
cd
libmemcache-1.4.0.rc2
.
/configure
make
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编译出错，输出如下：
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memcache.c: At top level:
../include/memcache/buffer.h:73: warning: inline function 'mcm_buf_remain_off' declared but never defined
../include/memcache/buffer.h:72: warning: inline function 'mcm_buf_remain' declared but never defined
../include/memcache/buffer.h:66: warning: inline function 'mcm_buf_len' declared but never defined
../include/memcache/buffer.h:73: warning: inline function 'mcm_buf_remain_off' declared but never defined
../include/memcache/buffer.h:72: warning: inline function 'mcm_buf_remain' declared but never defined
../include/memcache/buffer.h:66: warning: inline function 'mcm_buf_len' declared but never defined
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解决方法，参考：
http://pietercvdmlinux.blogspot.com/2012_07_01_archive.html
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wget
'http://svnweb.freebsd.org/ports/head/databases/libmemcache/files/patch-fix-inline?revision=248965&view=co'
-O libcache.patch
patch -p0 < libcache.patch
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再次
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make
make
install
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2.下载安装memcachefs
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mkdir
/usr/local/memcachefs
cd
/tmp
wget http:
//jaist
.dl.sourceforge.net
/project/memcachefs/memcachefs/0
.5
/memcachefs-0
.5.
tar
.gz
tar
-zxvf memcachefs-0.5.
tar
.gz
cd
memcachefs-0.5
.
/configure
--prefix=
/usr/local/memcachefs
make
make
install
cd
/usr/local/memcachefs
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3.挂载memcached
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mkdir
/usr/local/cache
.
/bin/memcachefs
192.168.11.52:11211
/usr/local/cache
#将远程的memcache挂载到本地
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报错如下：
“./bin/memcachefs: error while loading shared libraries: libmemcache.so.0: cannot open shared object file: No such file or directory”
解决方法：
将/usr/local/lib添加到/etc/ld.so.conf
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echo
"/usr/local/lib"
>>
/etc/ld
.so.conf
/sbin/ldconfig
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查看挂载情况：
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mount
-l
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memcachefs on /usr/local/cache type fuse.memcachefs (rw,nosuid,nodev)
使用
1.基本操作
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cd
/usr/local
echo
"helloworld"
> cache
/test_key
#设置一个cache数据，文件名是键，文件内容是值。等同于set key value操作。
cat
cache
/test_key
#获取cache数据。等同于get key操作。
ll cache/
#列出所有键。注意第五列不是指大小，而是表示字符长度。第六七列时间属性。
rm
cache
/test_key
#删除cache数据，等同于delete key操作。
mv
cache
/username
cache
/username
.bak
#重命名
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2.卸载
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# mount #查看挂载
# umount /usr/local/cache #卸载
# fusermount -u /usr/local/cache #卸载
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3.使用telnet客户端测试
set a 0 10 3 #10s过期。10s过后，cache目录下的a文件将被删除。
get username.bak #telnet方法获取memcachfs设置的cache数据
cat cache/a #通过memcachefs获取键a数据
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[root@test01
local
]
# telnet 192.168.11.52 11211
Trying 192.168.11.52...
Connected to 192.168.11.52.
Escape character is
'^]'
.
set
a 0 10 3
aaa
STORED
get username.bak
VALUE username.bak 0 6
ryanxu
END
quit
Connection closed by foreign host.
[root@test01
local
]
# cat cache/a
aaa
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