Redis 主從複製高可用方案
主節點：172.18.0.4
從節點：172.18.11.41
注意：所有從節點的配置都一樣
停止防火牆（有可能還需要iptables加規則）
systemctl stop firewalld.service
修改內核參數
vi /etc/sysctl.conf
vm.overcommit_memory = 1
安裝需要的系統包：
yum -y install gcc automake autoconf libtoolmake telnet ruby-devel ruby-irb ruby-libs ruby-rdoc ruby rubygems-develrubygems
安裝redis-3.2.8
wgethttp://download.redis.io/releases/redis-3.2.8.tar.gz
tar -zxvfredis-3.2.8.tar.gz
make
編譯安裝 make install PREFIX=/usr/local/redis
建立目錄：
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
從：/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
啓動文件：
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
從啓動文件：
#!/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
啓動停止命令：
（主從相同）
service redis start/stop/status
service sentinel stat/stop/status
安裝sentinel 如果Master異常，則會進行Master-Slave切換，將其中一個Slave作爲Master，將之前的Master作爲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 從配置文件：
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 主啓動文件：
/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 從啓動文件：
/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
注意點：
1)：首次啓動時，必須先啓動Master
2)：Sentinel 只在server 端做主從切換，
3)：若Master已經被判定爲下線，Sentinel已經選擇了新的Master，也已經將old Master改成Slave，但是還沒有將其改成new Master。若此時重啓old Master，則Redis集羣將處於無Master狀態，此時只能手動修改配置文件，然後重新啓動集羣
到此Redis集羣配置完畢
附錄（說明參數）：
daemonize：如需要在後臺運行，把該項的值改爲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只接收來自該IP的請求，如果不設置，那麼將處理所有請求，在生產環節中最好設置該項
port：監聽端口，默認爲6379
timeout：設置客戶端連接時的超時時間，單位爲秒
loglevel：等級分爲4級，debug，revbose，notice和warning。生產環境下一般開啓notice
logfile：配置log文件地址，默認使用標準輸出，即打印在命令行終端的端口上
database：設置數據庫的個數，默認使用的數據庫是0
save：設置redis進行數據庫鏡像的頻率
rdbcompression：在進行鏡像備份時，是否進行壓縮
dbfilename：鏡像備份文件的文件名
dir：數據庫鏡像備份的文件放置的路徑
slaveof：設置該數據庫爲其他數據庫的從數據庫
masterauth：當主數據庫連接需要密碼驗證時，在這裏設定
requirepass：設置客戶端連接後進行任何其他指定前需要使用的密碼
maxclients：限制同時連接的客戶端數量
maxmemory：設置redis能夠使用的最大內存
appendonly：開啓appendonly模式後，redis會把每一次所接收到的寫操作都追加到appendonly.aof文件中，當redis重新啓動時，會從該文件恢復出之前的狀態
ppendfsync：設置appendonly.aof文件進行同步的頻率
主要工具：
redis-benchmark：redis性能測試工具
redis-check-aof：檢查aof日誌的工具
redis-check-dump：檢查rdb日誌的工具
redis-cli：連接用的客戶端
redis-server：redis服務進程
