memcached+magent组成高可用
简介： 使用magent架设memcached高可用，当主的挂掉以后，备机可以继续使用。magent |----------------------------------------| | |memcached1 memcached2 memcached3 （master) (master) (backup)
一 安装memcached 下载下面安装包libevent-2.0.21-stable.tar.gzmemcached-1.4.32.tar.gzmagent-0.5.tar.gz
[*]安装libevent
tar –xzvf libevent-2.0.21-stable.tar.gzcd libevent-2.0.21-stable./configure –prefix=/usr/local/libeventmakemake install
[*]安装memcached
tar –xzvf memcached-1.4.32cd memcached-1.4.32./configure --prefix=/opt/memcached --with-libevent=/usr/local/libevent/makemake install
[*]magent安装
下载安装包文件magent-0.5.tar.gz解压tar –xzvf magent-0.5.tar.gz
make #执行编译安装
把编译好的magent拷贝到/opt/memcached/bin/ 目录下
[*]安装报错解决方案
# makegcc -Wall -g -O2 -I/usr/local/include -m64 -c -o magent.o magent.cmagent.c:71:19: error: event.h: No such file or directorymagent.c:130: error: field ‘ev’ has incomplete typemagent.c:161: error: field ‘ev’ has incomplete typemagent.c: In function ‘server_free’:magent.c:494: warning: implicit declaration of function ‘event_del’magent.c: In function ‘pool_server_handler’:magent.c:514: error: ‘EV_READ’ undeclared (first use in this function)magent.c:514: error: (Each undeclared identifier is reported only once
# 解决办法，检查下libevent安装路径，如果自定义安装了，拷贝下路径库。ln -s /usr/lib/libevent*/usr/lib64/
# makegcc -Wall -g -O2 -I/usr/local/include -m64 -c -o magent.o magent.cmagent.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 oncemagent.c:729: error: for each function it appears in.)make: *** Error 1
解决方法：vi ./ketama.h#在开头加入 #ifndef SSIZE_MAX #define SSIZE_MAX 32767 #endif
#libm.a不存在的时候，需要拷贝下面so，如果没有，需要安装glibc glibc-develcp /usr/lib64/libm.so /usr/lib64/libm.a
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':/root/libevent-2.0.21-stable/event.c:370: undefined reference to `clock_gettime'/usr/lib64/libevent.a(event.o): In function `detect_monotonic':/root/libevent-2.0.21-stable/event.c:340: undefined reference to `clock_gettime'collect2: ld returned 1 exit statusmake: *** Error 1
解决方法：
vi MakefileCFLAGS = -Wall -g -O2 -I/usr/local/include $(M64)改为： CFLAGS = -lrt -Wall -g -O2 -I/usr/local/include $(M64)
# make gcc -lrt -Wall -g -O2 -I/usr/local/include -o magent magent.o ketama.o -leventketama.o: In function `create_ketama':/root/magent5/ketama.c:399: undefined reference to `floorf'collect2: ld returned 1 exit statusmake: *** Error 1
解决办法：vi Makefile
LIBS = -levent –lm
三 启动
[*]启动memcached
/opt/memcached/bin/memcached -d -u root -c 10000 -m 8192 192.168.100.22 -p 11211
[*]启动magent
/opt/memcached/bin/magent -u root -n 102400 -l 192.168.100.24 -p 12001 -s 192.168.100.22:192.168.100.23:11211 -b 192.168.100.24:11211
四 测试
4.1 模拟一台主的坏掉
设置数据：
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