Redis 主从复制高可用方案
2017-06-14 10:12
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Redis 主从复制高可用方案
主节点：172.18.0.4
从节点：172.18.11.41
注意：所有从节点的配置都一样
停止防火墙（有可能还需要iptables加规则）
systemctl stop firewalld.service
修改内核参数
vi /etc/sysctl.conf
vm.overcommit_memory = 1
安装需要的系统包：
yum -y install gcc automake autoconf libtoolmake telnet ruby-devel ruby-irb ruby-libs ruby-rdoc ruby rubygems-develrubygems
安装redis-3.2.8
wgethttp://download.redis.io/releases/redis-3.2.8.tar.gz
tar -zxvfredis-3.2.8.tar.gz
make
编译安装 make install PREFIX=/usr/local/redis
建立目录：
mkdir-p/usr/local/redis/bin
cd /usr/local/src/redis-3.2.8/src
cp /usr/local/src/redis-3.2.8/redis.conf /etc
cp /usr/local/src/redis-3.2.8/sentinel.conf /etc
cp mkreleasdhdr.sh redis-benchmarkredis-check-aof redis-check-dump redis-cli redis-server
redis-sentinel /usr/local/redis/bin
修改配置文件
主：/etc/redis.conf
bind 172.18.0.4
protected-mode yes
port 6379
tcp-backlog 128
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile "/var/run/redis_6379.pid"
loglevel notice
logfile"/var/log/redis/redis.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename "dump.rdb"
dir "/usr/local/redis"
masterauth "xxxx1812"
slave-serve-stale-data yes
slave-read-only no
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
requirepass "hjhz1812"
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb60
client-output-buffer-limit pubsub 32mb 8mb60
hz 10
aof-rewrite-incremental-fsync yes
从：/etc/redis.conf
bind 172.18.11.41
protected-mode yes
port 6381
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile "/var/run/redis_6381.pid"
loglevel notice
logfile "/var/log/redis.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename "dump.rdb"
dir "/"
masterauth "hjhz1812"
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
requirepass "xxxx1812"
maxmemory 3000mb
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb60
client-output-buffer-limit pubsub 32mb 8mb60
hz 10
aof-rewrite-incremental-fsync yes
slaveof 172.18.0.4 6379
启动文件：
主：
#!/usr/bin/env bash
#
# redis start up the redis server daemon
#
# chkconfig: 345 99 99
# description: redis service in/etc/init.d/redis \
# chkconfig --add redis or chkconfig--list redis \
# service redis start or service redis stop
# processname: redis-server
# config: /etc/redis.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
REDISPORT=6379
EXEC=/usr/local/bin/redis-server
REDIS_CLI=/usr/local/bin/redis-cli
PIDFILE=/var/run/redis_6379.pid
CONF="/etc/redis.conf"
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep redis
;;
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does notexist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping ..."
$REDIS_CLI -h 172.18.0.4 -p 6379 -a xxxx1812 shutdown
while [ -x ${PIDFILE} ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/redis{start|stop|restart|force-reload}" >&2
exit 1
esac
从启动文件：
#!/usr/bin/env bash
#
# redis start up the redis server daemon
#
# chkconfig: 345 99 99
# description: redis service in/etc/init.d/redis \
# chkconfig --add redis orchkconfig --list redis \
# service redis start or service redis stop
# processname: redis-server
# config: /etc/redis.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
REDISPORT=6381
EXEC=/usr/local/bin/redis-server
REDIS_CLI=/usr/local/bin/redis-cli
PIDFILE=/var/run/redis_6381.pid
CONF="/etc/redis.conf"
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep redis
;;
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does notexist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping ..."
$REDIS_CLI -h 172.18.11.41 -p 6381 -a xxxx1812 shutdown
while [ -x ${PIDFILE} ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/redis {start|stop|restart|force-reload}">&2
exit 1
esac
启动停止命令：
（主从相同）
service redis start/stop/status
service sentinel stat/stop/status
安装sentinel 如果Master异常，则会进行Master-Slave切换，将其中一个Slave作为Master，将之前的Master作为Slave
Sentinel 主配置文件：
bind 172.18.0.4
protected-mode yes
daemonize yes
port 26379
dir "/tmp"
logfile"/usr/local/redis/sentinel.log"
sentinel monitor mymaster 172.18.0.4 6379 2
sentinel down-after-milliseconds mymaster15000
sentinel failover-timeout mymaster 900000
sentinel auth-pass mymaster hjhz1812
sentinel config-epoch mymaster 7
sentinel leader-epoch mymaster 7
# Generated by CONFIG REWRITE
sentinel known-slave mymaster 172.18.11.416381
sentinel current-epoch 7
sentinel 从配置文件：
bind 172.18.11.41
protected-mode yes
daemonize yes
port 26381
dir "/tmp"
logfile "/usr/local/redis/sentinel.log"
sentinel monitor mymaster 172.18.0.4 6379 2
sentinel down-after-milliseconds mymaster15000
sentinel failover-timeout mymaster 900000
sentinel auth-pass mymaster hjhz1812
sentinel config-epoch mymaster 7
# Generated by CONFIG REWRITE
sentinel leader-epoch mymaster 7
sentinel known-slave mymaster 172.18.11.416381
sentinel current-epoch 7
sentinel 主启动文件：
/etc/init.d/sentinel
#!/usr/bin/env bash
#
# redis start up the sentinel server daemon
#
# chkconfig: 345 98 98
# description: sentinel service in/etc/init.d/sentinel \
# chkconfig --add sentinel orchkconfig --list sentinel \
# service sentinel start or service sentinel stop
# processname: sentinel-server
# config: /etc/sentinel.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
EXEC=/usr/local/bin/redis-sentinel
REDIS_CLI=/usr/local/bin/redis-cli
#PIDFILE=/var/run/redis_6379.pid
CONF="/etc/sentinel.conf"
a=`ps -A|grep sentinel|wc -l`
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep sentinel
;;
start)
if [ $a -gt 0 ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ $a -eq 0 ]
then
echo "sentinel does not exist, process isnot running"
else
#PID=$(cat $PIDFILE)
echo "Stopping ..."
pkill sentinel
#$REDIS_CLI -h 172.18.0.4 -p 6379 -a xxxx1812 shutdown
while [ -x $a ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/sentinel{start|stop|restart|force-reload}" >&2
exit 1
esac
sentinel 从启动文件：
/etc/init.d/sentinel
#!/usr/bin/env bash
#
# redis-sentinel start up the redis serverdaemon
#
# chkconfig: 345 98 98
# description: redis service in/etc/init.d/redis \
# chkconfig --add sentinel orchkconfig --list sentinel \
# service sentinel start or service sentinel stop
# processname: sentinel-server
# config: /etc/sentinel.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
EXEC=/usr/local/bin/redis-sentinel
#REDIS_CLI=/usr/local/bin/redis-cli
#PIDFILE=/var/run/redis_6379.pid
CONF="/etc/sentinel.conf"
a=`ps -A|grep sentinel|wc -l`
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep sentinel
;;
start)
if [ $a -gt 0 ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ $a -eq 0 ]
then
echo "sentinel does notexist, process is not running"
else
#PID=$(cat $PIDFILE)
echo "Stopping ..."
pkill sentinel
#$REDIS_CLI -h 172.18.0.4 -p 6379 -a xxxx1812 shutdown
while [ -x $a ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/sentinel{start|stop|restart|force-reload}" >&2
exit 1
esac
注意点：
1)：首次启动时，必须先启动Master
2)：Sentinel 只在server 端做主从切换，
3)：若Master已经被判定为下线，Sentinel已经选择了新的Master，也已经将old Master改成Slave，但是还没有将其改成new Master。若此时重启old Master，则Redis集群将处于无Master状态，此时只能手动修改配置文件，然后重新启动集群
到此Redis集群配置完毕
附录（说明参数）：
daemonize：如需要在后台运行，把该项的值改为yes
pdifile：把pid文件放在/var/run/redis.pid，可以配置到其他地址
bind：指定redis只接收来自该IP的请求，如果不设置，那么将处理所有请求，在生产环节中最好设置该项
port：监听端口，默认为6379
timeout：设置客户端连接时的超时时间，单位为秒
loglevel：等级分为4级，debug，revbose，notice和warning。生产环境下一般开启notice
logfile：配置log文件地址，默认使用标准输出，即打印在命令行终端的端口上
database：设置数据库的个数，默认使用的数据库是0
save：设置redis进行数据库镜像的频率
rdbcompression：在进行镜像备份时，是否进行压缩
dbfilename：镜像备份文件的文件名
dir：数据库镜像备份的文件放置的路径
slaveof：设置该数据库为其他数据库的从数据库
masterauth：当主数据库连接需要密码验证时，在这里设定
requirepass：设置客户端连接后进行任何其他指定前需要使用的密码
maxclients：限制同时连接的客户端数量
maxmemory：设置redis能够使用的最大内存
appendonly：开启appendonly模式后，redis会把每一次所接收到的写操作都追加到appendonly.aof文件中，当redis重新启动时，会从该文件恢复出之前的状态
ppendfsync：设置appendonly.aof文件进行同步的频率
主要工具：
redis-benchmark：redis性能测试工具
redis-check-aof：检查aof日志的工具
redis-check-dump：检查rdb日志的工具
redis-cli：连接用的客户端
redis-server：redis服务进程
主节点：172.18.0.4
从节点：172.18.11.41
注意：所有从节点的配置都一样
停止防火墙（有可能还需要iptables加规则）
systemctl stop firewalld.service
修改内核参数
vi /etc/sysctl.conf
vm.overcommit_memory = 1
安装需要的系统包：
yum -y install gcc automake autoconf libtoolmake telnet ruby-devel ruby-irb ruby-libs ruby-rdoc ruby rubygems-develrubygems
安装redis-3.2.8
wgethttp://download.redis.io/releases/redis-3.2.8.tar.gz
tar -zxvfredis-3.2.8.tar.gz
make
编译安装 make install PREFIX=/usr/local/redis
建立目录：
mkdir-p/usr/local/redis/bin
cd /usr/local/src/redis-3.2.8/src
cp /usr/local/src/redis-3.2.8/redis.conf /etc
cp /usr/local/src/redis-3.2.8/sentinel.conf /etc
cp mkreleasdhdr.sh redis-benchmarkredis-check-aof redis-check-dump redis-cli redis-server
redis-sentinel /usr/local/redis/bin
修改配置文件
主：/etc/redis.conf
bind 172.18.0.4
protected-mode yes
port 6379
tcp-backlog 128
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile "/var/run/redis_6379.pid"
loglevel notice
logfile"/var/log/redis/redis.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename "dump.rdb"
dir "/usr/local/redis"
masterauth "xxxx1812"
slave-serve-stale-data yes
slave-read-only no
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
requirepass "hjhz1812"
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb60
client-output-buffer-limit pubsub 32mb 8mb60
hz 10
aof-rewrite-incremental-fsync yes
从：/etc/redis.conf
bind 172.18.11.41
protected-mode yes
port 6381
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile "/var/run/redis_6381.pid"
loglevel notice
logfile "/var/log/redis.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename "dump.rdb"
dir "/"
masterauth "hjhz1812"
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
requirepass "xxxx1812"
maxmemory 3000mb
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb60
client-output-buffer-limit pubsub 32mb 8mb60
hz 10
aof-rewrite-incremental-fsync yes
slaveof 172.18.0.4 6379
启动文件：
主：
#!/usr/bin/env bash
#
# redis start up the redis server daemon
#
# chkconfig: 345 99 99
# description: redis service in/etc/init.d/redis \
# chkconfig --add redis or chkconfig--list redis \
# service redis start or service redis stop
# processname: redis-server
# config: /etc/redis.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
REDISPORT=6379
EXEC=/usr/local/bin/redis-server
REDIS_CLI=/usr/local/bin/redis-cli
PIDFILE=/var/run/redis_6379.pid
CONF="/etc/redis.conf"
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep redis
;;
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does notexist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping ..."
$REDIS_CLI -h 172.18.0.4 -p 6379 -a xxxx1812 shutdown
while [ -x ${PIDFILE} ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/redis{start|stop|restart|force-reload}" >&2
exit 1
esac
从启动文件：
#!/usr/bin/env bash
#
# redis start up the redis server daemon
#
# chkconfig: 345 99 99
# description: redis service in/etc/init.d/redis \
# chkconfig --add redis orchkconfig --list redis \
# service redis start or service redis stop
# processname: redis-server
# config: /etc/redis.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
REDISPORT=6381
EXEC=/usr/local/bin/redis-server
REDIS_CLI=/usr/local/bin/redis-cli
PIDFILE=/var/run/redis_6381.pid
CONF="/etc/redis.conf"
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep redis
;;
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does notexist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping ..."
$REDIS_CLI -h 172.18.11.41 -p 6381 -a xxxx1812 shutdown
while [ -x ${PIDFILE} ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/redis {start|stop|restart|force-reload}">&2
exit 1
esac
启动停止命令：
（主从相同）
service redis start/stop/status
service sentinel stat/stop/status
安装sentinel 如果Master异常，则会进行Master-Slave切换，将其中一个Slave作为Master，将之前的Master作为Slave
Sentinel 主配置文件：
bind 172.18.0.4
protected-mode yes
daemonize yes
port 26379
dir "/tmp"
logfile"/usr/local/redis/sentinel.log"
sentinel monitor mymaster 172.18.0.4 6379 2
sentinel down-after-milliseconds mymaster15000
sentinel failover-timeout mymaster 900000
sentinel auth-pass mymaster hjhz1812
sentinel config-epoch mymaster 7
sentinel leader-epoch mymaster 7
# Generated by CONFIG REWRITE
sentinel known-slave mymaster 172.18.11.416381
sentinel current-epoch 7
sentinel 从配置文件：
bind 172.18.11.41
protected-mode yes
daemonize yes
port 26381
dir "/tmp"
logfile "/usr/local/redis/sentinel.log"
sentinel monitor mymaster 172.18.0.4 6379 2
sentinel down-after-milliseconds mymaster15000
sentinel failover-timeout mymaster 900000
sentinel auth-pass mymaster hjhz1812
sentinel config-epoch mymaster 7
# Generated by CONFIG REWRITE
sentinel leader-epoch mymaster 7
sentinel known-slave mymaster 172.18.11.416381
sentinel current-epoch 7
sentinel 主启动文件：
/etc/init.d/sentinel
#!/usr/bin/env bash
#
# redis start up the sentinel server daemon
#
# chkconfig: 345 98 98
# description: sentinel service in/etc/init.d/sentinel \
# chkconfig --add sentinel orchkconfig --list sentinel \
# service sentinel start or service sentinel stop
# processname: sentinel-server
# config: /etc/sentinel.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
EXEC=/usr/local/bin/redis-sentinel
REDIS_CLI=/usr/local/bin/redis-cli
#PIDFILE=/var/run/redis_6379.pid
CONF="/etc/sentinel.conf"
a=`ps -A|grep sentinel|wc -l`
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep sentinel
;;
start)
if [ $a -gt 0 ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ $a -eq 0 ]
then
echo "sentinel does not exist, process isnot running"
else
#PID=$(cat $PIDFILE)
echo "Stopping ..."
pkill sentinel
#$REDIS_CLI -h 172.18.0.4 -p 6379 -a xxxx1812 shutdown
while [ -x $a ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/sentinel{start|stop|restart|force-reload}" >&2
exit 1
esac
sentinel 从启动文件：
/etc/init.d/sentinel
#!/usr/bin/env bash
#
# redis-sentinel start up the redis serverdaemon
#
# chkconfig: 345 98 98
# description: redis service in/etc/init.d/redis \
# chkconfig --add sentinel orchkconfig --list sentinel \
# service sentinel start or service sentinel stop
# processname: sentinel-server
# config: /etc/sentinel.conf
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
EXEC=/usr/local/bin/redis-sentinel
#REDIS_CLI=/usr/local/bin/redis-cli
#PIDFILE=/var/run/redis_6379.pid
CONF="/etc/sentinel.conf"
a=`ps -A|grep sentinel|wc -l`
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep sentinel
;;
start)
if [ $a -gt 0 ]
then
echo "$PIDFILE exists,process is already running or crashed"
else
echo "Starting Redisserver..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis isrunning..."
fi
;;
stop)
if [ $a -eq 0 ]
then
echo "sentinel does notexist, process is not running"
else
#PID=$(cat $PIDFILE)
echo "Stopping ..."
pkill sentinel
#$REDIS_CLI -h 172.18.0.4 -p 6379 -a xxxx1812 shutdown
while [ -x $a ]
do
echo "Waiting forRedis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
${0} stop
${0} start
;;
*)
echo "Usage: /etc/init.d/sentinel{start|stop|restart|force-reload}" >&2
exit 1
esac
注意点：
1)：首次启动时，必须先启动Master
2)：Sentinel 只在server 端做主从切换，
3)：若Master已经被判定为下线，Sentinel已经选择了新的Master，也已经将old Master改成Slave，但是还没有将其改成new Master。若此时重启old Master，则Redis集群将处于无Master状态，此时只能手动修改配置文件，然后重新启动集群
到此Redis集群配置完毕
附录（说明参数）：
daemonize：如需要在后台运行，把该项的值改为yes
pdifile：把pid文件放在/var/run/redis.pid，可以配置到其他地址
bind：指定redis只接收来自该IP的请求，如果不设置，那么将处理所有请求，在生产环节中最好设置该项
port：监听端口，默认为6379
timeout：设置客户端连接时的超时时间，单位为秒
loglevel：等级分为4级，debug，revbose，notice和warning。生产环境下一般开启notice
logfile：配置log文件地址，默认使用标准输出，即打印在命令行终端的端口上
database：设置数据库的个数，默认使用的数据库是0
save：设置redis进行数据库镜像的频率
rdbcompression：在进行镜像备份时，是否进行压缩
dbfilename：镜像备份文件的文件名
dir：数据库镜像备份的文件放置的路径
slaveof：设置该数据库为其他数据库的从数据库
masterauth：当主数据库连接需要密码验证时，在这里设定
requirepass：设置客户端连接后进行任何其他指定前需要使用的密码
maxclients：限制同时连接的客户端数量
maxmemory：设置redis能够使用的最大内存
appendonly：开启appendonly模式后，redis会把每一次所接收到的写操作都追加到appendonly.aof文件中，当redis重新启动时，会从该文件恢复出之前的状态
ppendfsync：设置appendonly.aof文件进行同步的频率
主要工具：
redis-benchmark：redis性能测试工具
redis-check-aof：检查aof日志的工具
redis-check-dump：检查rdb日志的工具
redis-cli：连接用的客户端
redis-server：redis服务进程
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