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让Redis开机自启
Redis是一个高性能的键值存储系统，广泛应用于各种应用场景中，为了确保Redis在服务器重启后能够自动运行，我们需要将其配置为开机自启，下面将详细介绍如何实现Redis的开机自启。
1. 安装Redis
我们需要在服务器上安装Redis，可以通过以下命令来安装：
sudo apt-get update sudo apt-get install redis-server
2. 创建Redis配置文件
默认情况下，Redis会使用`/etc/redis/redis.conf`作为配置文件，我们可以编辑该文件来自定义Redis的配置，使用文本编辑器打开该文件：
sudo nano /etc/redis/redis.conf
3. 配置开机自启
在配置文件中找到`daemonize no`这一行，将其修改为`daemonize yes`，表示以守护进程方式运行Redis，保存并关闭文件。
4. 创建启动脚本
为了实现开机自启，我们需要创建一个启动脚本并将其添加到系统的启动项中，创建一个名为`redis_start.sh`的脚本文件：
sudo nano /etc/init.d/redis_start.sh
在该文件中添加以下内容：
#!/bin/bash
# chkconfig: 2345 80 90
# description: Redis is an in-memory data structure store, used as the distributed, in-memory key-value database, cache and message broker, with optional durability.
# processname: redis_6379
# pidfile: /var/run/redis_6379.pid
# config: /etc/redis/redis.conf
BEGIN INIT INFO
# Provides: redis_6379
# Required-Start: $remote_fs $syslog $named $network $time $portmap $xinetd $limitfs $setgid
# Required-Stop: $remote_fs $syslog $named $network $time $portmap $xinetd $limitfs $setgid
# Should-Start: $network $time $syslog
# Should-Stop: $network $time $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: starts the redis server daemonized mode
# Description: starts the redis server daemonized mode providing fault tolerance, access through network, and data recovery. See http://redis.io for details.
END INIT INFO
REDISPORT=6379
EXEC=/usr/local/bin/redis-server /etc/redis/redis.conf --port ${REDISPORT} --daemonize yes >> /var/log/redis_${REDISPORT}.log 2>&1 &
PIDFILE=/var/run/redis_${REDISPORT}.pid
case "$1" in
start)
echo "Starting Redis..."
if [ -f ${PIDFILE} ] && kill -0 `cat ${PIDFILE}`; then
echo "Redis is already running." >> /var/log/redis_${REDISPORT}.log 2>&1
else
echo "Starting Redis..." >> /var/log/redis_${REDISPORT}.log 2>&1 & ${EXEC}
sleep 10s # wait for the server to start completely before adding it to the init process list. Otherwise, we may get a "timeout" error when trying to stop the server later on.
echo "Redis started." >> /var/log/redis_${REDISPORT}.log 2>&1 & touch ${PIDFILE} # create the PID file so that we can signal the server to stop later on.
fi;;
stop)
if [ -f ${PIDFILE} ] && kill -0 `cat ${PIDFILE}`; then
echo "Stopping Redis..." >> /var/log/redis_${REDISPORT}.log 2>&1 & kill -TERM `cat ${PIDFILE}` && wait `cat ${PIDFILE}` && echo "Redis stopped." >> /var/log/redis_${REDISPORT}.log 2>&1 & rm -f ${PIDFILE} # gracefully stop the server first by sending it SIGTERM and then wait for it to exit before removing the PID file and logging the event. else echo "Cannot find the PID file or the server is not running." >> /var/log/redis_${REDISPORT}.log 2>&1; fi;;
restart)
if [ -f ${PIDFILE} ] && kill -0 `cat ${PIDFILE}`; then echo "Restarting Redis..." >> /var/log/redis_${REDISPORT}.log 2>&1 & kill -TERM `cat ${PIDFILE}` && sleep 10s && ${EXEC} && echo "Redis restarted." >> /var/log/redis_${REDISPORT}.log 2>&1 & else echo "Cannot find the PID file or the server is not running." >> /var/log/redis_${REDISPORT}.log 2>&1; fi;; status) if [ -f ${PIDFILE} ] && kill -0 `cat ${PIDFILE}`; then echo "Redis is running." >> /var/log/redis_${REDISPORT}.log 2>&1 & else echo "Redis is not running." >> /var/log/redis_${REDISPORT}.log 2>&1; fi;; *) echo "Usage: service {start|stop|restart|status}" >> /var/log/redis_${REDISPORT}.log 2>&1;;
esac
exit 0
保存并关闭文件，给脚本文件添加执行权限：
sudo chmod +x /etc/init.d/redis_start.sh
5.
