老男孩之memcached精讲第二部
1.1Memcache 服务器的安装。
Linux，FreeBSD，Solaris，windows。这里以Centos6.4为例进行说明。
软件地址：Memcached 下载地址： libevent 下载地址： 网友安装资料：http://instance.iteye.com/blog/1691705
安装memcached
安装libevent（c6.6）
安装环境：
[root@lnmp tools]# tar xf libevent-1.4.13-stable.tar.gz
[root@lnmp tools]# cd libevent-1.4.13-stable
[root@lnmp libevent-1.4.13-stable]# ./configure
[root@lnmp libevent-1.4.13-stable]# make && make install
Centos操作系统可以使用 yum直接安装libevent
安装memcached：
[root@lnmp tools]# tar xf memcached-1.4.13.tar.gz
[root@lnmp tools]# cd memcached-1.4.13
[root@lnmp memcached-1.4.13]# ./configure
[root@lnmp memcached-1.4.13]# make && make install
其他下载地址：
http://memcached.googlecode.com/files/memcached-1.4.15.tar.gz
http://code.google.com/p/memecached/downloads/list
提示：
memcache-2.2.5.tgz<==客户端
memcached-1.4.13.tar.gz<==服务端软件
启动Memcached：
（1）配置ld.so.conf路径防止启动memcached时报错
（2）开机启动memcached
[root@lnmp memcached-1.4.13]# which memcached/usr/local/bin/memcached [root@lnmp memcached-1.4.13]# which memcached/usr/local/bin/memcached [root@lnmp memcached-1.4.13]# memcached -d -c 10240 -p 11211 -m 16 -P /var/run/memcached.pid -u root [root@lnmp memcached-1.4.13]# netstat -lntup | grep 11211tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 1040/memcached tcp 0 0 :::11211 :::* LISTEN 1040/memcached udp 0 0 0.0.0.0:11211 0.0.0.0:* 1040/memcached udp 0 0 :::11211 :::* 1040/memcached 需要查看memcached它的帮助是-h
[root@lnmp memcached-1.4.13]# memcached -h memcached 1.4.13 -p <num> TCP port number to listen on (default: 11211) -U <num> UDP port number to listen on (default: 11211, 0 is off) -s <file> UNIX socket path to listen on (disables network support) -a <mask> access mask for UNIX socket, in octal (default: 0700) -l <addr> interface to listen on (default: INADDR_ANY, all addresses) <addr> may be specified as host:port. If you don‘t specify a port number, the value you specified with -p or -U is used. You may specify multiple addresses separated by comma or by using -l multiple times -d run as a daemon -r maximize core file limit -u <username> assume identity of <username> (only when run as root) -m <num> max memory to use for items in megabytes (default: 64 MB) -M return error on memory exhausted (rather than removing items) -c <num> max simultaneous connections (default: 1024) -k lock down all paged memory. Note that there is a limit on how much memory you may lock. Trying to allocate more than that would fail, so be sure you set the limit correctly for the user you started the daemon with (not for -u <username> user; under sh this is done with ‘ulimit -S -l NUM_KB‘). -v verbose (print errors/warnings while in event loop) -vv very verbose (also print client commands/reponses) -vvv extremely verbose (also print internal state transitions) -h print this help and exit -i print memcached and libevent license -P <file> save PID in <file>, only used with -d option -f <factor> chunk size growth factor (default: 1.25) -n <bytes> minimum space allocated for key+value+flags (default: 48) -L Try to use large memory pages (if available). Increasing the memory page size could reduce the number of TLB misses and improve the performance. In order to get large pages from the OS, memcached will allocate the total item-cache in one large chunk. -D <char> Use <char> as the delimiter between key prefixes and IDs. This is used for per-prefix stats reporting. The default is ":" (colon). If this option is specified, stats collection is turned on automatically; if not, then it may be turned on by sending the "stats detail on" command to the server. -t <num> number of threads to use (default: 4) -R Maximum number of requests per event, limits the number of requests process for a given connection to prevent starvation (default: 20) -C Disable use of CAS -b Set the backlog queue limit (default: 1024) -B Binding protocol - one of ascii, binary, or auto (default) -I Override the size of each slab page. Adjusts max item size (default: 1mb, min: 1k, max: 128m) -o Comma separated list of extended or experimental options - (EXPERIMENTAL) maxconns_fast: immediately close new connections if over maxconns limit - hashpower: An integer multiplier for how large the hash table should be. Can be grown at runtime if not big enough. Set this based on "STAT hash_power_level" before a restart. -d 是以进程后台进行 -c 是以多少为并发 -p 以什么端口来进行监听 -m 指定多少内存 -P 以什么什么pid文件-u指定root memcahced 相关启动参数说明： -p 指定memcached服务监听的TCP端口。默认为11211. -m 指定memcached服务可以缓存数据的最大内存。默认64MB（量小的时候太大内存）。 -u 运行Memcached服务的用户 -d 作为守护进程在后台运行 -c 最大的并发连接数，默认是1024，按照服务器的并发访问量来设定。 -vv 以very vrebose 模式启动，调试信息和错误输出到控制台。 -P 设置保存Memcache的pid文件（$$） -l 指定监听的服务器IP地址。 其它选项，通过"memcached -h"命令可以显示所有可用的选项。读者可自行阅读相关资料。-f 调优因子
（3） 检查启动结果：
[root@lnmp ~]# netstat -lntup | grep 11211 tcp 0 0 0.0.0.0:11211 0.0.0.0:* LISTEN 1850/memcached tcp 0 0 :::11211 :::* LISTEN 1850/memcached udp 0 0 0.0.0.0:11211 0.0.0.0:* 1850/memcached udp 0 0 :::11211 :::* 1850/memcached
启动多个实例：
[root@lnmp ~]# memcached -d -m 16 -p 11212 -c 10240 -P /var/run/memcahed.pid -u root [root@lnmp ~]# ps -ef | grep memcahed| grep -v grep root 1850 1 0 23:03 ? 00:00:00 memcached -d -m 16 -p 11211 -c 10240 -P /var/run/memcahed.pid -u root root 1866 1 0 23:12 ? 00:00:00 memcached -d -m 16 -p 11212 -c 10240 -P /var/run/memcahed.pid -u root
（ 4）写入 数据检查结果：
向memcached中添加数据：键值对
key1->values1key2->values2 ============================== 管理Mysql和MC做一个对比 Mysql insert->MC:set Mysql select->MC:set Mysql delete->MC:set
a.通过nc写入
添加键值对的操作：printf "set key008 0 0 10\r\noldboy0987\r\n"|nc 127.0.0.1 11211
。。。。。。。。。。。
原文：http://yanruohan.blog.51cto.com/9740053/1899510