1. 背景
许多Web 应用程序都将数据保存到RDBMS中,应用服务器从中读取数据并在浏览器中显示。但随着数据量的增大,访问的集中,就会出现REBMS的负担加重,数据库响应恶化,网站显示延迟等重大影响。Memcached是高性能的分布式内存缓存服务器。一般的使用目的是通过缓存数据库查询结果,减少数据库的访问次数,以提高动态Web 应用的速度、提高扩展性.
* redis比memcached优势
2. 环境
4. 安装(/usr/local/src)
下载: wget http://download.redis.io/releases/redis-3.2.8.tar.gz
解压: tar zxvf redis-3.2.8.tar.gz
进入目录: cd redis-3.2.8
编译并指定安装目录: make PREFIX=/usr/local/redis-3.2.8 install
创建软链接: ln -s /usr/local/redis-3.2.8 /usr/local/redis
5. 配置文件(当前还在redis源码目录[/usr/local/src/redis-3.2.8]内)
cp redis.conf /etc/redis.conf
编辑/etc/redis.conf
daemonize no ==> daemonize yes (设置redis为后台daemon进程)
6. 创建redis用户
[root@redis-server ~]# useradd -r -s /sbin/nologin -M redis
7. 创建启动脚本/etc/init.d/redis
#!/bin/sh
#
# redis init file for starting up the redis daemon
#
# chkconfig: - 20 80
# description: Starts and stops the redis daemon.
# Source function library.
#!/bin/sh
#
# redis init file for starting up the redis daemon
#
# chkconfig: - 20 80
# description: Starts and stops the redis daemon.
# Source function library.
. /etc/rc.d/init.d/functions
name="redis-server"
exec="/usr/local/redis/bin/$name"
pidfile="/var/run/redis/redis.pid"
REDIS_CONFIG="/etc/redis.conf"
[ -e /etc/sysconfig/redis ] && . /etc/sysconfig/redis
lockfile=/var/lock/subsys/redis
start() {
[ -f $REDIS_CONFIG ] || exit 6
[ -x $exec ] || exit 5
echo -n $"Starting $name: "
daemon --user ${REDIS_USER-redis} "$exec $REDIS_CONFIG"
retval=$?
echo
[ $retval -eq 0 ] && touch $lockfile
return $retval
}
stop() {
echo -n $"Stopping $name: "
killproc -p $pidfile $name
retval=$?
echo
[ $retval -eq 0 ] && rm -f $lockfile
return $retval
}
restart() {
stop
start
}
reload() {
false
}
rh_status() {
status -p $pidfile $name
}
rh_status_q() {
rh_status >/dev/null 2>&1
}
case "$1" in
start)
rh_status_q && exit 0
$1
;;
stop)
rh_status_q || exit 0
$1
;;
restart)
$1
;;
reload)
rh_status_q || exit 7
$1
;;
force-reload)
force_reload
;;
status)
rh_status
;;
condrestart|try-restart)
rh_status_q || exit 0
restart
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart}"
exit 2
esac
exit $?
8. 修改脚本文件权限
[root@redis-server ~]# chmod 755 /etc/init.d/redis
9. 添加进service服务管理并设置