Memcached和Magent简介及安装

haoman

• 　　memcached的安装
  

• 　　安装libevent
  
  

[root@test ~]# wget https://cloud.github.com/downloads/libevent/libevent/libevent-2.0.19-stable.tar.gz
[root@test ~]# tar zxvf libevent-2.0.19-stable.tar.gz
[root@test ~]# cd libevent-2.0.19-stable
[root@test libevent-2.0.19-stable]# ./configure --prefix=/usr/
[root@test libevent-2.0.19-stable]# make && make install　　2.安装memcached
[root@test ~]# wget http://www.memcached.org/files/memcached-1.4.22.tar.gz  
[root@test ~]# tar zxvf memcached-1.4.22.tar.gz
[root@test memcached-1.4.22]# ./configure --prefix=/usr/local/memcached --with-libevent=/usr/
[root@test memcached-1.4.22]# make && make install

• 　　magent的安装
  　　magent是一款开源的Memcached代理服务器软件，其项目网址为：
  

[root@test ~]# tar zxvf magent-0.6.tar.gz
[root@test ~]# mkdir /usr/local/magent
[root@test magent]# tar zxvf magent-0.6.tar.gz
ketama.c
ketama.h
magent.c
Makefile
[root@test magent]# make
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: *** [magent.o] Error 1
解决方法:
[root@test magent]# vim ketama.h
#ifndef SSIZE_MAX
#define SSIZE_MAX      32767
#endif
#ifndef _KETAMA_H
#define _KETAMA_H
struct dot {
        unsigned int point;
        int srvid;
};
struct ketama {
        unsigned int numpoints;
        struct dot *dot;
        int count;
        char **name;
        int *weight;
        int totalweight;
};
int create_ketama(struct ketama *, int);
void free_ketama(struct ketama *);
int get_server(struct ketama *, const char *);
#endif
[root@test magent]# make
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
make: *** [magent] Error 1
解决方案:
[root@test magent]# ln -svf /usr/lib/libevent* /usr/lib64/
`/usr/lib64/libevent-2.0.so.5' -> `/usr/lib/libevent-2.0.so.5'
`/usr/lib64/libevent-2.0.so.5.1.7' -> `/usr/lib/libevent-2.0.so.5.1.7'
`/usr/lib64/libevent.a' -> `/usr/lib/libevent.a'
`/usr/lib64/libevent_core-2.0.so.5' -> `/usr/lib/libevent_core-2.0.so.5'
`/usr/lib64/libevent_core-2.0.so.5.1.7' -> `/usr/lib/libevent_core-2.0.so.5.1.7'
`/usr/lib64/libevent_core.a' -> `/usr/lib/libevent_core.a'
`/usr/lib64/libevent_core.la' -> `/usr/lib/libevent_core.la'
`/usr/lib64/libevent_core.so' -> `/usr/lib/libevent_core.so'
`/usr/lib64/libevent_extra-2.0.so.5' -> `/usr/lib/libevent_extra-2.0.so.5'
`/usr/lib64/libevent_extra-2.0.so.5.1.7' -> `/usr/lib/libevent_extra-2.0.so.5.1.7'
`/usr/lib64/libevent_extra.a' -> `/usr/lib/libevent_extra.a'
`/usr/lib64/libevent_extra.la' -> `/usr/lib/libevent_extra.la'
`/usr/lib64/libevent_extra.so' -> `/usr/lib/libevent_extra.so'
`/usr/lib64/libevent.la' -> `/usr/lib/libevent.la'
`/usr/lib64/libevent_pthreads-2.0.so.5' -> `/usr/lib/libevent_pthreads-2.0.so.5'
`/usr/lib64/libevent_pthreads-2.0.so.5.1.7' -> `/usr/lib/libevent_pthreads-2.0.so.5.1.7'
`/usr/lib64/libevent_pthreads.a' -> `/usr/lib/libevent_pthreads.a'
`/usr/lib64/libevent_pthreads.la' -> `/usr/lib/libevent_pthreads.la'
`/usr/lib64/libevent_pthreads.so' -> `/usr/lib/libevent_pthreads.so'
`/usr/lib64/libevent.so' -> `/usr/lib/libevent.so'
[root@test magent]# make
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: *** [magent] Error 1
解决方案:
如果是64bit的系统则不会在/usr/lib64/libm.a 生成，如果是32bit即会有
[root@test magent]# yum install glibc glibc-devel
[root@test magent]# cp /usr/lib64/libm.so /usr/lib64/libm.a
[root@test magent]# make
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 `gettime':
/usr/local/src/libevent-2.0.19-stable/event.c:366: undefined reference to `clock_gettime'
/usr/lib64/libevent.a(event.o): In function `detect_monotonic':
/usr/local/src/libevent-2.0.19-stable/event.c:336: undefined reference to `clock_gettime'
collect2: ld returned 1 exit status
make: *** [magent] Error 1
解决方案:
[root@test magent]# vim Makefile
CFLAGS = -Wall -g -O2 -I/usr/local/include $(M64)
改为:
CFLAGS = -lrt -Wall -g -O2 -I/usr/local/include $(M64)
[root@test magent]# make
gcc -lrt -Wall -g -O2 -I/usr/local/include -m64 -o magent magent.o ketama.o /usr/lib64/libevent.a /usr/lib64/libm.a
[root@test magent]# ls    终于成功了- -!
ketama.c  ketama.h  ketama.o  magent  magent-0.6.tar.gz  magent.c  magent.o  Makefile
[root@test magent]# cp magent /bin/

• 　　启动memcached
  

　　memecached默认不允许root用户启动进程,需要为memcached创建一个用户

[root@test src]# useradd -s /sbin/nologin memcached
[root@test ~]# memcached -c 10240 -l 192.168.40.144 -p 11215 -u memcached -m 10 -n 40 -f 2 -d
[root@test ~]# memcached -c 10240 -l 192.168.40.144 -p 11216 -u memcached -m 10 -n 40 -f 2 -d
[root@test ~]# ps -ef | grep memcached | grep -v "grep"
501      11784     1  0 01:34 ?        00:00:00 memcached -c 10240 -l 192.168.40.144 -p 11215 -u memcached -m 10 -n 40 -f 2 -d
501      11791     1  0 01:35 ?        00:00:00 memcached -c 10240 -l 192.168.40.144 -p 11216 -u memcached -m 10 -n 40 -f 2 -d

• 　　启用magent管理memcached
  

[root@test ~]# magent -u root -n 51200 -l 192.168.40.144 -p 12001 -s 192.168.40.144:11215  -b 192.168.40.144:11216# -S为主服务器 -b为备服务器