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[经验分享] 61 redis基础入门、redis应用进阶

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发表于 2018-11-4 10:34:01 | 显示全部楼层 |阅读模式
  01redis基础入门
  #安装redis
  [root@node1 ~]# rpm -ivh epel-release-latest-6.noarch.rpm
  [root@node2 ~]# yum localinstall redis-3.0.7-4.el6.art.i686.rpm
  [root@node2 ~]# cp /etc/redis.conf{,.orgi}
  [root@node2 ~]# vim /etc/redis.conf
  修改
  bind 127.0.0.1
  
  bind 127.0.0.1 192.168.1.122
  [root@node2 ~]# service redis start
  #连接
  [root@node2 ~]# redis-cli -h 192.168.1.122
  192.168.1.122:6379> exit
  [root@node2 ~]# redis-cli
  127.0.0.1:6379>
  #设定变量值
  127.0.0.1:6379> SET disto fedora
  OK
  #获得变更值
  127.0.0.1:6379> GET disto
  "fedora"
  #在变量后面追加值
  127.0.0.1:6379> append disto slackware
  (integer) 15
  127.0.0.1:6379> GET disto
  "centosslackware"
  #取得变更的长度
  127.0.0.1:6379> STRLEN disto
  (integer) 15
  #增加变量的值
  127.0.0.1:6379> SET count 0
  OK
  127.0.0.1:6379> INCR count
  (integer) 1
  127.0.0.1:6379> INCR count
  (integer) 2
  127.0.0.1:6379> INCR count
  (integer) 3
  127.0.0.1:6379> INCR count
  (integer) 4
  127.0.0.1:6379> INCR count
  (integer) 5
  #减少变量的值
  127.0.0.1:6379> DECR count
  (integer) 4
  127.0.0.1:6379> DECR count
  (integer) 3
  127.0.0.1:6379> DECR count
  (integer) 2
  #键不存在时才设定其值
  127.0.0.1:6379> SET disto gentoo NX
  (nil)
  127.0.0.1:6379> GET disto
  "centosslackware"
  #键存在时才设定其值
  127.0.0.1:6379> SET boo bar XX
  (nil)
  127.0.0.1:6379> LPUSH l1 mon
  (integer) 1
  127.0.0.1:6379> LINDEX l1 0
  "mon"
  127.0.0.1:6379> LPUSH l1 sun
  (integer) 2
  127.0.0.1:6379> LINDEX l1 0
  "sun"
  127.0.0.1:6379> LINDEX l1 1
  "mon"
  127.0.0.1:6379> RPUSH l1 tue
  (integer) 3
  127.0.0.1:6379> LINDEX l1 2
  "tue"
  127.0.0.1:6379> LSET l1 1 fri
  OK
  127.0.0.1:6379> LINDEX l1 1
  "fri"
  127.0.0.1:6379> RPOP l1
  "tue"
  127.0.0.1:6379> RPOP l1
  "fri"
  127.0.0.1:6379> RPOP l1
  "sun"
  127.0.0.1:6379> RPOP l1
  (nil)
  #集合
  #创建集合
  127.0.0.1:6379> SADD w1 mon tue wed thu fri sat sun
  (integer) 7
  127.0.0.1:6379> SADD w2 tue thu day
  (integer) 3
  #交集
  127.0.0.1:6379> SINTER w1 w2
  1) "tue"
  2) "thu"
  #并集
  127.0.0.1:6379> SUNION w1 w2
  1) "tue"
  2) "thu"
  3) "sat"
  4) "day"
  5) "sun"
  6) "fri"
  7) "wed"
  8) "mon"
  #弹出元素
  127.0.0.1:6379> SPOP w1
  "sun"
  127.0.0.1:6379> SPOP w1
  "sat"
  #判断元素mon是否在集合w1中
  127.0.0.1:6379> SISMEMBER w1 mon
  (integer) 1#1表示在集合中
  127.0.0.1:6379> SISMEMBER w1 sat
  (integer) 0#0表示不在集合中
  127.0.0.1:6379> ZADD weekday1 1 mon 2 tue 3 wed
  (integer) 3
  127.0.0.1:6379> ZCARD weekday1
  (integer) 3
  127.0.0.1:6379> ZRANK weekday1 tue
  (integer) 1
  127.0.0.1:6379> ZRANK weekday1 wed
  (integer) 2
  127.0.0.1:6379> ZRANK weekday1 mon
  (integer) 0
  127.0.0.1:6379> ZSCORE weekday1 tue
  "2"
  127.0.0.1:6379> ZRANGE weekday1 0 2
  1) "mon"
  2) "tue"
  3) "wed"
  127.0.0.1:6379> ZRANGE weekday1 0 1
  1) "mon"
  2) "tue"
  127.0.0.1:6379> HSET h1 a mon
  (integer) 1
  127.0.0.1:6379> HGET h1 a
  "mon"
  127.0.0.1:6379> HSET h1 b tue
  (integer) 1
  127.0.0.1:6379> HGET h1 a
  "mon"
  127.0.0.1:6379> HGET h1 b
  "tue"
  127.0.0.1:6379> HKEYS h1
  1) "a"
  2) "b"
  127.0.0.1:6379> HVALS h1
  1) "mon"
  2) "tue"
  127.0.0.1:6379> HLEN h1
  (integer) 2
  02redis应用进阶
  配置环境
  Master 192.168.1.122 node2
  Slave 192.168.1.121 node1
  #添加认证功能
  [root@node2 ~]# vim /etc/redis.conf
  修改
  # requirepass foobared
  
  requirepass mageedu
  [root@node2 ~]# service redis restart
  [root@node2 ~]# redis-cli -h 192.168.1.122
  192.168.1.122:6379> SELECT 0
  (error) NOAUTH Authentication required.
  192.168.1.122:6379> AUTH mageedu
  OK
  192.168.1.122:6379> SELECT 0
  OK
  192.168.1.122:6379> exit
  #清空当前库
  [root@node2 ~]# redis-cli -h 192.168.1.122
  192.168.1.122:6379> FLUSHDB
  OK
  #事务
  192.168.1.122:6379> MULTI
  OK
  192.168.1.122:6379> SET ip 192.168.1.1
  QUEUED
  192.168.1.122:6379> GET ip
  QUEUED
  192.168.1.122:6379> SET port 8080
  QUEUED
  192.168.1.122:6379> GET port
  QUEUED
  192.168.1.122:6379> EXEC
  1) OK
  2) "192.168.1.1"
  3) OK
  4) "8080"
  在第一个终端执行
  192.168.1.122:6379> WATCH ip
  OK
  192.168.1.122:6379> MULTI
  OK
  192.168.1.122:6379> SET ip 10.0.0.1
  QUEUED
  192.168.1.122:6379> GET ip
  QUEUED
  在第二个终端执行:
  [root@node2 ~]# redis-cli
  127.0.0.1:6379> GET ip
  "192.168.1.1"
  127.0.0.1:6379> SET ip 172.16.100.99
  OK
  127.0.0.1:6379> GET ip
  "172.16.100.99"
  #返回第一个终端执行
  192.168.1.122:6379> EXEC
  (nil)
  192.168.1.122:6379> MULTI
  OK
  192.168.1.122:6379> GET ip
  QUEUED
  192.168.1.122:6379> SET port 6379
  QUEUED
  192.168.1.122:6379> SETTTTT
  (error) ERR unknown command 'SETTTTT'
  192.168.1.122:6379> EXEC
  (error) EXECABORT Transaction discarded because of previous errors.
  192.168.1.122:6379> PING
  PONG
  192.168.1.122:6379> ECHO "hello redis"
  "hello redis"
  127.0.0.1:6379> CLIENT GETNAME
  (nil)
  127.0.0.1:6379> CLIENT SETNAME location
  OK
  127.0.0.1:6379> CLIENT GETNAME
  "location"
  127.0.0.1:6379> DBSIZE
  (integer) 2
  #在第一个终端执行
  192.168.1.122:6379> SUBSCRIBE news
  Reading messages... (press Ctrl-C to quit)
  1) "subscribe"
  2) "news"
  3) (integer) 1
  #在第二个终端执行:
  [root@node2 ~]# redis-cli
  127.0.0.1:6379> PUBLISH news hello
  (integer) 1
  返回第一个终端显示:
  1) "message"
  2) "news"
  3) "hello"
  #第二个终端发送
  127.0.0.1:6379> PUBLISH news redis
  (integer) 1
  #第一个终端显示
  1) "message"
  2) "news"
  3) "redis"
  #第一个终端执行
  192.168.1.122:6379> PSUBSCRIBE "news.i[to]"
  Reading messages... (press Ctrl-C to quit)
  1) "psubscribe"
  2) "news.i[to]"
  3) (integer) 1
  #第二个终端执行
  127.0.0.1:6379> PUBLISH news.io hello
  (integer) 1
  #此时第一个终端显示
  1) "pmessage"
  2) "news.i[to]"
  3) "news.io"
  4) "hello"
  #第二个终端发送
  127.0.0.1:6379> PUBLISH news.it hello
  (integer) 1
  #此时第一个终端显示
  1) "pmessage"
  2) "news.i[to]"
  3) "news.it"
  4) "hello"
  [root@node2 ~]# redis-cli
  127.0.0.1:6379> CONFIG GET dir
  1) "dir"
  2) "/var/lib/redis"
  127.0.0.1:6379> CONFIG SET appendonly yes
  OK
  #启动复制功能
  #配置从服务器
  [root@node1 ~]# yum localinstall redis-3.0.7-4.el6.art.i686.rpm -y
  [root@node1 ~]# service redis start
  [root@node1 ~]# vim /etc/redis.conf
  修改
  bind 127.0.0.1
  
  bind 127.0.0.1 192.168.1.121
  [root@node1 ~]# service redis restart
  127.0.0.1:6379> SLAVEOF 192.168.1.122 6379
  OK
  127.0.0.1:6379> GET ip
  "172.16.100.99"
  127.0.0.1:6379> KEYS *
  1) "ip"
  2) "port"
  [root@node2 ~]# tail /var/log/redis/redis.log
  13408:M 20 Jan 21:18:18.261 * Residual parent diff successfully flushed to the rewritten AOF (0.00 MB)
  13408:M 20 Jan 21:18:18.262 * Background AOF rewrite finished successfully
  13408:M 20 Jan 21:50:33.502 * Slave 192.168.1.121:6379 asks for synchronization
  13408:M 20 Jan 21:50:33.502 * Full resync requested by slave 192.168.1.121:6379
  13408:M 20 Jan 21:50:33.502 * Starting BGSAVE for SYNC with target: disk
  13408:M 20 Jan 21:50:33.509 * Background saving started by pid 17459
  17459:C 20 Jan 21:50:33.631 * DB saved on disk
  17459:C 20 Jan 21:50:33.632 * RDB: 4 MB of memory used by copy-on-write
  13408:M 20 Jan 21:50:33.699 * Background saving terminated with success
  13408:M 20 Jan 21:50:33.700 * Synchronization with slave 192.168.1.121:6379 succeeded
  [root@node1 ~]# redis-cli
  127.0.0.1:6379> INFO REPLICATION
  # Replication
  role:slave
  master_host:192.168.1.122
  master_port:6379
  master_link_status:up
  master_last_io_seconds_ago:1
  master_sync_in_progress:0
  slave_repl_offset:2115
  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
  127.0.0.1:6379> KEYS *
  1) "ip"
  2) "port"
  #1、同一主机上启动多个redis服务,并配置主从服务
  [root@node1 ~]# killall redis-server
  [root@node1 ~]# mkdir /etc/redis -p
  [root@node1 ~]# cp /etc/redis.conf /etc/redis
  [root@node1 ~]# cd /etc/redis
  [root@node1 redis]# ls
  redis.conf
  [root@node1 redis]# cp redis.conf{,.2}
  [root@node1 redis]# cp redis.conf{,.3}
  [root@node1 redis]# ls
  redis.conf  redis.conf.2  redis.conf.3
  [root@node1 redis]# mkdir -p /redis/db{1,2,3}
  [root@node1 redis]# chown -R redis.redis /redis/db*
  [root@node1 redis]# vim redis.conf
  修改
  bind 127.0.0.1
  
  bind 0.0.0.0
  修改
  daemonize no
  
  daemonize yes
  [root@node1 redis]# vim redis.conf.2
  修改
  pidfile /var/run/redis/redis.pid
  
  pidfile /var/run/redis/redis2.pid
  修改
  port 6379
  
  port 6380
  修改
  logfile /var/log/redis/redis.log
  
  logfile /var/log/redis/redis2.log
  修改
  dir /var/lib/redis/
  
  dir /redis/db2
  修改
  bind 127.0.0.1
  
  bind 0.0.0.0
  修改
  daemonize no
  
  daemonize yes
  [root@node1 redis]# cp redis.conf.{2,3}
  [root@node1 redis]# vim redis.conf.3
  修改
  pidfile /var/run/redis/redis2.pid
  
  pidfile /var/run/redis/redis3.pid
  修改
  port 6380
  
  port 6381
  修改
  logfile /var/log/redis/redis2.log
  
  logfile /var/log/redis/redis3.log
  修改
  dir /redis/db2
  
  dir /redis/db3
  
  [root@node1 redis]# redis-server /etc/redis/redis.conf
  [root@node1 redis]# redis-server /etc/redis/redis.conf.2
  [root@node1 redis]# redis-server /etc/redis/redis.conf.3
  #默认为主服务器
  [root@node1 redis]# redis-cli -h 192.168.1.121 -p 6379
  192.168.1.121:6379> info replication
  # Replication
  role:master
  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
  #设置为从服务器
  [root@node1 ~]# redis-cli -h 192.168.1.121 -p 6380
  192.168.1.121:6380> info replication
  # Replication
  role:master
  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
  192.168.1.121:6380> slaveof 192.168.1.121 6379
  OK
  192.168.1.121:6380> info replication
  # Replication
  role:slave
  master_host:192.168.1.121
  master_port:6379
  master_link_status:up
  master_last_io_seconds_ago:5
  master_sync_in_progress:0
  slave_repl_offset:43
  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
  #主服务器
  192.168.1.121:6379> info replication
  # Replication
  role:master
  connected_slaves:1
  slave0:ip=192.168.1.121,port=6380,state=online,offset=85,lag=1
  master_repl_offset:85
  repl_backlog_active:1
  repl_backlog_size:1048576
  repl_backlog_first_byte_offset:2
  repl_backlog_histlen:84
  #第二个从服务器
  [root@node1 ~]# redis-cli -h 192.168.1.121 -p 6381
  192.168.1.121:6381> slaveof 192.168.1.121 6379
  OK
  192.168.1.121:6381> info replication
  # Replication
  role:slave
  master_host:192.168.1.121
  master_port:6379
  master_link_status:up
  master_last_io_seconds_ago:7
  master_sync_in_progress:0
  slave_repl_offset:197
  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
  #主服务器
  192.168.1.121:6379> info replication
  # Replication
  role:master
  connected_slaves:2
  slave0:ip=192.168.1.121,port=6380,state=online,offset=281,lag=0
  slave1:ip=192.168.1.121,port=6381,state=online,offset=281,lag=0
  master_repl_offset:281
  repl_backlog_active:1
  repl_backlog_size:1048576
  repl_backlog_first_byte_offset:2
  repl_backlog_histlen:280
  192.168.1.121:6379> SET ip 1.1.1.1
  OK
  192.168.1.121:6379> keys *
  1) "ip"
  2) "port"
  192.168.1.121:6379> SET cache varnish
  OK
  #第一个从服务器测试
  192.168.1.121:6380> keys *
  1) "cache"
  2) "ip"
  3) "port"
  #第二个从服务器测试
  192.168.1.121:6381> keys *
  1) "port"
  2) "cache"
  3) "ip"
  结果:数据同步成功
  #2、配置SENTINEL实现高可用
  [root@node1 ~]# cp /etc/redis-sentinel.conf /etc/redis
  [root@node1 ~]# cd /etc/redis
  [root@node1 redis]# vim redis-sentinel.conf
  修改
  sentinel monitor mymaster 127.0.0.1 6379 2
  
  sentinel monitor mymaster 192.168.1.121 6379 1
  修改
  sentinel down-after-milliseconds mymaster 30000
  
  sentinel down-after-milliseconds mymaster 5000
  修改
  sentinel failover-timeout mymaster 180000
  
  sentinel failover-timeout mymaster 60000
  [root@node1 redis]# redis-sentinel /etc/redis/redis-sentinel.conf
  [root@node1 ~]# redis-cli -h 192.168.1.121 -p 26379
  192.168.1.121:26379> info
  # Server
  redis_version:3.0.7
  redis_git_sha1:00000000
  redis_git_dirty:0
  redis_build_id:dec06ea72e680a6e
  redis_mode:sentinel
  os:Linux 2.6.32-573.el6.x86_64 x86_64
  arch_bits:32
  multiplexing_api:epoll
  gcc_version:4.4.7
  process_id:17275
  run_id:5b209e48291bb6421865d633142928b450e9810c
  tcp_port:26379
  uptime_in_seconds:89
  uptime_in_days:0
  hz:10
  lru_clock:8570474
  config_file:/etc/redis/redis-sentinel.conf
  # Sentinel
  sentinel_masters:1
  sentinel_tilt:0
  sentinel_running_scripts:0
  sentinel_scripts_queue_length:0
  master0:name=mymaster,status=ok,address=192.168.1.121:6379,slaves=2,sentinels=1
  192.168.1.121:26379> SENTINEL masters
  1)  1) "name"
  2) "mymaster"
  3) "ip"
  4) "192.168.1.121"
  5) "port"
  6) "6379"
  7) "runid"
  8) "17edeb0c1c6547dc08a2447a4b15f83752227619"
  9) "flags"
  10) "master"
  11) "pending-commands"
  12) "0"
  13) "last-ping-sent"
  14) "0"
  15) "last-ok-ping-reply"
  16) "231"
  17) "last-ping-reply"
  18) "231"
  19) "down-after-milliseconds"
  20) "5000"
  21) "info-refresh"
  22) "3443"
  23) "role-reported"
  24) "master"
  25) "role-reported-time"
  26) "225408"
  27) "config-epoch"
  28) "0"
  29) "num-slaves"
  30) "2"
  31) "num-other-sentinels"
  32) "0"
  33) "quorum"
  34) "1"
  35) "failover-timeout"
  36) "60000"
  37) "parallel-syncs"
  38) "1"
  192.168.1.121:26379> SENTINEL slaves mymaster
  1)  1) "name"
  2) "192.168.1.121:6381"
  3) "ip"
  4) "192.168.1.121"
  5) "port"
  6) "6381"
  7) "runid"
  8) "b63391c22c2ba7e8a0b64f3584c0c0681b60e0e6"
  9) "flags"
  10) "slave"
  11) "pending-commands"
  12) "0"
  13) "last-ping-sent"
  14) "0"
  15) "last-ok-ping-reply"
  16) "353"
  17) "last-ping-reply"
  18) "353"
  19) "down-after-milliseconds"
  20) "5000"
  21) "info-refresh"
  22) "7511"
  23) "role-reported"
  24) "slave"
  25) "role-reported-time"
  26) "409168"
  27) "master-link-down-time"
  28) "0"
  29) "master-link-status"
  30) "ok"
  31) "master-host"
  32) "192.168.1.121"
  33) "master-port"
  34) "6379"
  35) "slave-priority"
  36) "100"
  37) "slave-repl-offset"
  38) "29592"
  2)  1) "name"
  2) "192.168.1.121:6380"
  3) "ip"
  4) "192.168.1.121"
  5) "port"
  6) "6380"
  7) "runid"
  8) "ec7be925efaec88712836d12682e498ddac15ffd"
  9) "flags"
  10) "slave"
  11) "pending-commands"
  12) "0"
  13) "last-ping-sent"
  14) "0"
  15) "last-ok-ping-reply"
  16) "353"
  17) "last-ping-reply"
  18) "353"
  19) "down-after-milliseconds"
  20) "5000"
  21) "info-refresh"
  22) "7511"
  23) "role-reported"
  24) "slave"
  25) "role-reported-time"
  26) "409197"
  27) "master-link-down-time"
  28) "0"
  29) "master-link-status"
  30) "ok"
  31) "master-host"
  32) "192.168.1.121"
  33) "master-port"
  34) "6379"
  35) "slave-priority"
  36) "100"
  37) "slave-repl-offset"
  38) "29592"
  #停掉主服务器
  [root@node1 ~]# ps -ef | grep redis-server
  root     17120     1  0 09:56 ?        00:00:05 redis-server 0.0.0.0:6379         
  root     17127     1  0 09:57 ?        00:00:05 redis-server 0.0.0.0:6380           
  root     17134     1  0 09:58 ?        00:00:05 redis-server 0.0.0.0:6381           
  root     17350 17325  0 10:35 pts/5    00:00:00 grep redis-server
  [root@node1 ~]# kill 17120
  新的主服务器变为6381
  192.168.1.121:26379> info
  # Server
  redis_version:3.0.7
  redis_git_sha1:00000000
  redis_git_dirty:0
  redis_build_id:dec06ea72e680a6e
  redis_mode:sentinel
  os:Linux 2.6.32-573.el6.x86_64 x86_64
  arch_bits:32
  multiplexing_api:epoll
  gcc_version:4.4.7
  process_id:17275
  run_id:5b209e48291bb6421865d633142928b450e9810c
  tcp_port:26379
  uptime_in_seconds:836
  uptime_in_days:0
  hz:13
  lru_clock:8571221
  config_file:/etc/redis/redis-sentinel.conf
  # Sentinel
  sentinel_masters:1
  sentinel_tilt:0
  sentinel_running_scripts:0
  sentinel_scripts_queue_length:0
  master0:name=mymaster,status=ok,address=192.168.1.121:6381,slaves=2,sentinels=1
  192.168.1.121:26379> SENTINEL masters
  1)  1) "name"
  2) "mymaster"
  3) "ip"
  4) "192.168.1.121"
  5) "port"
  6) "6381"
  7) "runid"
  8) "b63391c22c2ba7e8a0b64f3584c0c0681b60e0e6"
  9) "flags"
  10) "master"
  11) "pending-commands"
  12) "0"
  13) "last-ping-sent"
  14) "0"
  15) "last-ok-ping-reply"
  16) "782"
  17) "last-ping-reply"
  18) "782"
  19) "down-after-milliseconds"
  20) "5000"
  21) "info-refresh"
  22) "9017"
  23) "role-reported"
  24) "master"
  25) "role-reported-time"
  26) "149664"
  27) "config-epoch"
  28) "1"
  29) "num-slaves"
  30) "2"
  31) "num-other-sentinels"
  32) "0"
  33) "quorum"
  34) "1"
  35) "failover-timeout"
  36) "60000"
  37) "parallel-syncs"
  38) "1"
  #6380从服务器,其主服务器也自动变为6381
  192.168.1.121:6380> info replication
  # Replication
  role:slave
  master_host:192.168.1.121
  master_port:6381
  master_link_status:up
  master_last_io_seconds_ago:0
  master_sync_in_progress:0
  slave_repl_offset:32393
  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
  重新启动原来的主服务器
  [root@node1 redis]# redis-server /etc/redis/redis.conf
  192.168.1.121:26379> info
  # Server
  redis_version:3.0.7
  redis_git_sha1:00000000
  redis_git_dirty:0
  redis_build_id:dec06ea72e680a6e
  redis_mode:sentinel
  os:Linux 2.6.32-573.el6.x86_64 x86_64
  arch_bits:32
  multiplexing_api:epoll
  gcc_version:4.4.7
  process_id:17275
  run_id:5b209e48291bb6421865d633142928b450e9810c
  tcp_port:26379
  uptime_in_seconds:1401
  uptime_in_days:0
  hz:10
  lru_clock:8571786
  config_file:/etc/redis/redis-sentinel.conf
  # Sentinel
  sentinel_masters:1
  sentinel_tilt:0
  sentinel_running_scripts:0
  sentinel_scripts_queue_length:0
  master0:name=mymaster,status=ok,address=192.168.1.121:6381,slaves=2,sentinels=1
  #其主节点仍然是6381  
  192.168.1.121:26379> SENTINEL slaves mymaster
  1)  1) "name"
  2) "192.168.1.121:6380"
  3) "ip"
  4) "192.168.1.121"
  5) "port"
  6) "6380"
  7) "runid"
  8) "ec7be925efaec88712836d12682e498ddac15ffd"
  9) "flags"
  10) "slave"
  11) "pending-commands"
  12) "0"
  13) "last-ping-sent"
  14) "0"
  15) "last-ok-ping-reply"
  16) "319"
  17) "last-ping-reply"
  18) "319"
  19) "down-after-milliseconds"
  20) "5000"
  21) "info-refresh"
  22) "9957"
  23) "role-reported"
  24) "slave"
  25) "role-reported-time"
  26) "672844"
  27) "master-link-down-time"
  28) "0"
  29) "master-link-status"
  30) "ok"
  31) "master-host"
  32) "192.168.1.121"
  33) "master-port"
  34) "6381"
  35) "slave-priority"
  36) "100"
  37) "slave-repl-offset"
  38) "46232"
  2)  1) "name"
  2) "192.168.1.121:6379"
  3) "ip"
  4) "192.168.1.121"
  5) "port"
  6) "6379"
  7) "runid"
  8) "879035ca537f48727c21f455cc1e69c396d436fb"
  9) "flags"
  10) "slave"
  11) "pending-commands"
  12) "0"
  13) "last-ping-sent"
  14) "0"
  15) "last-ok-ping-reply"
  16) "319"
  17) "last-ping-reply"
  18) "319"
  19) "down-after-milliseconds"
  20) "5000"
  21) "info-refresh"
  22) "1140"
  23) "role-reported"
  24) "slave"
  25) "role-reported-time"
  26) "91410"
  27) "master-link-down-time"
  28) "0"
  29) "master-link-status"
  30) "ok"
  31) "master-host"
  32) "192.168.1.121"
  33) "master-port"
  34) "6381"
  35) "slave-priority"
  36) "100"
  37) "slave-repl-offset"
  38) "46951"
  
  #原来的主节点重启之后变为从节点   


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