memcached主备安装
一、软件下载wget http://memcached.googlecode.com/files/memcached-1.4.13.tar.gz
wget http://memagent.googlecode.com/files/magent-0.6.tar.gz
wget http://monkey.org/~provos/libevent-1.4.9-stable.tar.gz
二、安装libevent-1.4.9-stable.tar.gz
tar zxvf libevent-2.0.13-stable.tar.gz
cd libevent-2.0.13-stable
./configure --with-libevent=/usr
make
make install
三、安装memcached
tar zxvf memcached-1.4.13.tar.gz
cd memcached-1.4.13
./configure --with-libevent=/usr
make
make install
四、安装magent
tar zxvf magent-0.6.tar.gz
make
cp magent /usr/bin/
报错1：
gcc -Wall -g -O2 -I/usr/local/include -m64 -c -o magent.o magent.c
magent.c: In function 'writev_list':
magent.c:729: error: 'SSIZE_MAX' undeclared (first use in this function)
magent.c:729: error: (Each undeclared identifier is reported only once
magent.c:729: error: for each function it appears in.)
make: *** Error 1
解决办法：
# vi ketama.h
#在开头加入
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767
#endif
报错2：
gcc -Wall -g -O2 -I/usr/local/include -m64 -c -o magent.o magent.c
gcc -Wall -g -O2 -I/usr/local/include -m64 -c -o ketama.o ketama.c
gcc -Wall -g -O2 -I/usr/local/include -m64 -o magent magent.o ketama.o /usr/lib64/libevent.a /usr/lib64/libm.a
gcc: /usr/lib64/libevent.a: No such file or directory
gcc: /usr/lib64/libm.a: No such file or directory
解决办法：
# ln -s /usr/lib/libevent*/usr/lib64/
# make
报错3：
gcc -Wall -g -O2 -I/usr/local/include -m64 -o magent magent.o ketama.o /usr/lib64/libevent.a /usr/lib64/libm.a
gcc: /usr/lib64/libm.a: No such file or directory
make: *** Error 1
解决办法：
yum install glibc glibc-devel
如果是64bit的系统则不会在/usr/lib64/libm.a 生成，如果是32bit即会有。
# cp /usr/lib64/libm.so /usr/lib64/libm.a
报错4：
gcc -Wall -g -O2 -I/usr/local/include -m64 -o magent magent.o ketama.o /usr/lib64/libevent.a /usr/lib64/libm.a
/usr/lib64/libevent.a(event.o): In function `detect_monotonic':
event.c:(.text+0xc79): undefined reference to `clock_gettime'
/usr/lib64/libevent.a(event.o): In function `gettime':
event.c:(.text+0xd60): undefined reference to `clock_gettime'
collect2: ld returned 1 exit status
make: *** Error 1
解决办法：
# vi Makefile
CFLAGS = -Wall -g -O2 -I/usr/local/include $(M64)
改为：
CFLAGS = -lrt -Wall -g -O2 -I/usr/local/include $(M64)
五、启动服务
5.1memcached启动
memcached启动参数描述：
-d ：启动一个守护进程，
-m：分配给Memcache使用的内存数量，单位是MB，默认是64MB，
-u ：运行Memcache的用户
-l：监听的服务器IP地址
-p ：设置Memcache监听的端口，默认是11211 注：-p（p为小写）
-c ：设置最大并发连接数，默认是1024
-P ：设置保存Memcache的pid文件 注：-P（P为大写）
如果要结束Memcache进程，执行：kill cat pid文件路径
memcached -m 10 -u root -d -l 0.0.0.0 -p 11211 -vv >> /tmp/memcached.log 2>&1
netstat -antphttp://wiki.amssy.com/download/attachments/1377596/1.bmp?version=1&modificationDate=1389778135000&api=v2
5.2magent启动
magent -u root -n 51200 -l 192.168.35.56 -p 12000 -s 127.0.0.1:11211 -b 127.0.0.1:11212分别在127.0.0.1机器的11211，11212端口启动2个Memcached进程，在12000端口开启magent代理程序；
11211主Memcached，11212为备份Memcached；
六、验证测试
# telnet 192.168.35.56 12000
Trying 192.168.35.56...
Connected to 192.168.35.56.
Escape character is '^]'.
stats
memcached agent v0.6
matrix 1 -> 127.0.0.1:11211, pool size 0
END
# telnet 192.168.1.219 12000
Trying 1192.168.1.219...
Connected to 192.168.1。219.
Escape character is '^]'.
stats
memcached agent v0.4
matrix 1 -> 192.168.1.219:11211, pool size 0
matrix 2 -> 192.168.1.219:11212, pool size 0
END
set key1 0 0 5
reesun
STORED
set key2 0 0 6
reesun1
STORED
quit
Connection closed by foreign host.
# telnet 192.168.1.219 11211
Trying 192.168.1.219...
Connected to 192.168.1.219.
Escape character is '^]'.
get key1
END
get key2
VALUE key2 0 6
reesun1
END
quit
Connection closed by foreign host.
# telnet 192.168.1.219 11212
Trying 192.168.1.219...
Connected to 1192.168.1.219.
Escape character is '^]'.
get key1
VALUE key1 0 5
reesun
END
get key2
END
quit
Connection closed by foreign host.
# telnet 192.168.1.219 11213
Trying 192.168.1.219...
Connected to 1192.168.1.219.
Escape character is '^]'.
get key1
VALUE key1 0 5
reesun
END
get key2
VALUE key2 0 6
reesun1
END
quit
Connection closed by foreign host
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