Redis Sentinel HA自动切换
redis 2.8.11 下载
http://redis.io/download
http://download.redis.io/releases/redis-2.8.11.tar.gz
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| master 192.168.0.210
slave 192.168.0.211
slave 192.168.0.213
#安装redis 2.8.11
cd /srv/
tar xf redis-2.8.11.tar.gz
cd redis-2.8.11
make && make install
#复制启动文件
cp -rp /srv/redis-2.8.11/utils/redis_init_script /etc/init.d/redis
chmod +x /etc/init.d/redis
#master 配置文件
/etc/redis/redis.conf
####
daemonize yes
pidfile /var/run/redis/redis.pid
port 6379
bind 0.0.0.0
timeout 0
loglevel notice
logfile /var/log/redis/redis.log
databases 16
save 900 1
save 300 10
save 60 10000
rdbcompression yes
dbfilename dump.rdb
dir /var/lib/redis/
slave-serve-stale-data yes
appendonly no
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
slowlog-log-slower-than 10000
slowlog-max-len 1024
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
activerehashing yes
requirepass angel01
slave-read-only yes
maxmemory 1G
########
#slave配置
########
daemonize yes
pidfile /var/run/redis/redis.pid
port 6379
bind 0.0.0.0
timeout 0
loglevel notice
logfile /var/log/redis/redis.log
databases 16
save 900 1
save 300 10
save 60 10000
rdbcompression yes
dbfilename dump.rdb
dir /var/lib/redis/
slave-serve-stale-data yes
appendonly yes
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
slowlog-log-slower-than 10000
slowlog-max-len 1024
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
activerehashing yes
slave-serve-stale-data yes
slaveof 192.168.0.210 6379
masterauth angel01
slave-read-only yes
maxmemory 1G
#############
|
可以通过以下2种方式查看是否主从
方案1
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| redis-cli -a angel01 -h 192.168.0.210 info Replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.0.211,port=6379,state=online,offset=21327,lag=1
slave1:ip=192.168.0.213,port=6379,state=online,offset=21327,lag=1
master_repl_offset:21327
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:21326
|
方案2
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| master 上操作
redis-cli -a angel01
set leon good
slave 上操作
redis-cli -a angel01
get leon
"good"
即可成功
|
slave-read-only yes 从只有只读权限
maxmemory 1G 最大使用内存1G
appendonly yes slave 上，开启aof备份，路径在dir /var/lib/redis/下面
这边需要注意的是，AOF和RDB的备份，在主上只开启RDB，在SLAVE上2个都开启，但在故障转移的时候slave升成master时，压力会比原来的master大，那是因为RDB和AOF是不会自动转移的。
到此说明redis正常工作了，接下来开始使用哨兵sentinel进行监控以及主从切换
如下操作
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| cp -rp /srv/redis-2.8.11/sentinel.conf /etc/redis/
vim /etc/redis/sentinel.conf
port 26379
dir /var/lib/redis
sentinel monitor mymaster 192.168.0.210 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
sentinel auth-pass mymaster angel01
/etc/init.d/redis-sentinel /etc/sentinel.conf --sentinel #启动命令
|
故障演示
3台机器都启动查看
redis-cli -h 192.168.0.210 -p 26379 info Sentinel 可以查看信息
关闭slave
没有任何响应
关闭master
可以看到213接替了210成了master
到此完成切换
