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Memcache文件系统memcachefs部署和使用

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Memcache 文件系统memcachefs 部署和使用 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.sourcefor

Memcache文件系统memcachefs部署和使用



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

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


b)挂载fuse内核模块

modprobe fuse
lsmod | grep "fuse"


c)安装libmemcache-1.4.0.rc2.tar.bz2

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


编译出错,输出如下:

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


解决方法,参考:

http://pietercvdmlinux.blogspot.com/2012_07_01_archive.html

wget 'http://svnweb.freebsd.org/ports/head/databases/libmemcache/files/patch-fix-inline?revision=248965&view=co' -O libcache.patch
patch -p0 < libcache.patch


再次

make
make install

 

2.下载安装memcachefs

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

 

3.挂载memcached

mkdir /usr/local/cache
./bin/memcachefs 192.168.11.52:11211 /usr/local/cache #将远程的memcache挂载到本地


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

echo "/usr/local/lib" >> /etc/ld.so.conf
/sbin/ldconfig


查看挂载情况:

mount -l

memcachefs on /usr/local/cache type fuse.memcachefs (rw,nosuid,nodev)

 

使用


1.基本操作

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

 

2.卸载

# mount #查看挂载
# umount /usr/local/cache #卸载
# fusermount -u /usr/local/cache #卸载


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

[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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