redis的哨兵模式

baodeyun

master  ：192.168.20.114

slave1    : 192.168.20.113

salve2    : 192.168.20.116

三台服务器都安装redis相同的版本redis-3.0.5.tar.gz

安装略：

redis服务器的配置相同：

master ：

cd /usr/local/redis/

cat redis.conf

bind 0.0.0.0
daemonize yes
pidfile /var/run/redis.pid
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 0
loglevel notice
logfile "/usr/local/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 ./
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
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-entries 512
list-max-ziplist-value 64
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 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes


redis-slave1:

cat redis.conf

bind 0.0.0.0
daemonize yes
pidfile /var/run/redis.pid
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 0
loglevel notice
logfile "/usr/local/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 ./
slaveof 192.168.20.121 6379    #salve比master多了这一行ip是master的ip地址
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
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-entries 512
list-max-ziplist-value 64
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 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes


redis-slave2

cat redis.conf

bind 0.0.0.0
daemonize yes
pidfile /var/run/redis.pid
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 0
loglevel notice
logfile "/usr/local/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 ./
slaveof 192.168.20.121 6379    #salve比master多了这一行ip是master的ip地址
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
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-entries 512
list-max-ziplist-value 64
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 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes


哨兵模式的配置文件也是相同：

master :

cat sentinel.conf

port 26379
daemonize yes
dir /tmp
logfile "/usr/local/redis/sentinel.log"
sentinel monitor mymaster 192.168.20.121 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000

salve1:

cat sentinel.conf

port 26379
daemonize yes
dir /tmp
logfile "/usr/local/redis/sentinel.log"
sentinel monitor mymaster 192.168.20.121 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000

slave2:

cat sentinel.conf

port 26379
daemonize yes
dir /tmp
logfile "/usr/local/redis/sentinel.log"
sentinel monitor mymaster 192.168.20.121 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000

启动redis和sentinel(所有节点都启动)

redis-server /usr/local/redis/redis.conf

redis-sentinel /usr/local/redis/sentinel.conf

查看各redis的角色：

121：

redis-cli -h 192.168.20.121 -p 6379 INFO|grep role

role:master

120：

redis-cli -h 192.168.20.120 -p 6379 INFO|grep role

role:slave

119：

redis-cli -h 192.168.20.119 -p 6379 INFO|grep role

role:slave

查看主节点的信息：

redis-cli -h 192.168.20.121 -p 6379 info Replication

# Replication
role:master
connected_slaves:2
slave0:ip=192.168.20.120,port=6379,state=online,offset=42097,lag=0            #salve节点
slave1:ip=192.168.20.119,port=6379,state=online,offset=42097,lag=0            #salve节点
master_repl_offset:42097
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:42096


master有两个节点，同时现在已连接成功

此时打开master的sentinel.conf，在末尾可看到如下自动写入的内容：

port 26379
daemonize yes
dir "/tmp"
logfile "/usr/local/redis/sentinel.log"
sentinel monitor mymaster 192.168.20.121 6379 2
sentinel config-epoch mymaster 0
sentinel leader-epoch mymaster 0
sentinel known-slave mymaster 192.168.20.120 6379
# Generated by CONFIG REWRITE
sentinel known-slave mymaster 192.168.20.119 6379
sentinel known-sentinel mymaster 192.168.20.119 26379 4cce67dc6006ce85af935bba7bcbafabbd640126
sentinel known-sentinel mymaster 192.168.20.120 26379 f37fbb62618de39fb7a3cb204f00f163164405d2
sentinel current-epoch 0

查看从节点的信息：

119 ：

redis-cli -h 192.168.20.119 -p 6379 info Replication

# Replication
role:slave
master_host:192.168.20.121
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:117104
slave_priority:100
slave_read_only:1
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

120 :

redis-cli -h 192.168.20.120 -p 6379 info Replication

# Replication
role:slave
master_host:192.168.20.121
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:135963
slave_priority:100
slave_read_only:1
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

此时redis的哨兵模式就完成了，

下面模拟当master停止工作时看看是否能够自动切换


停止master的工作：

redis-cli -h 192.168.20.121

192.168.20.121:6379> shutdown
not connected> quit

[root@bogon redis]# redis-cli -h 192.168.20.119 -p 6379 INFO|grep role

role:master

[root@bogon redis]# redis-cli -h 192.168.20.120 -p 6379 INFO|grep role

role:slave

此时查看119 上升为master


当原master恢复正常工作时查看此时的角色

121：

redis-cli -h 192.168.20.121 -p 6379 INFO|grep role

role:slave


查看此时119的从节点的数量：

redis-cli  -h 192.168.20.119 -p 6379 info replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.20.120,port=6379,state=online,offset=77642,lag=0
slave1:ip=192.168.20.121,port=6379,state=online,offset=77499,lag=1
master_repl_offset:77642
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:77641

此时119上升为master，有两个salve节点，分别是121和120

iyunv.com.cn

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北极小熊

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