redis单机安装在Linux下安装Redis非常简单,具体步骤如下(官网有说明):1、下载源码,解压缩后编译源码。
tar -zxvf redis-3.0.6.tar.gzmv redis-3.0.6.tar.gz rediscd redismake |
2、编译完成后,在Src目录下,有四个可执行文件redis-server、redis-benchmark、redis-cli和redis.conf。然后拷贝到一个目录下。
mkdir /usr/softinstall/redis/xbincp redis-server /usr/softinstall/redis/xbin
cp redis-benchmark /usr/softinstall/redis/xbin
cp redis-cli /usr/softinstall/redis/xbin
cp redis.conf /usr/softinstall/redis/xbin
cd /usr/softinstall/redis/xbin |
3、启动Redis服务。
$ redis-server redis.conf |
4、然后用客户端测试一下是否启动成功。
$ redis-cli
redis> set foo bar
OK
redis> get foo
"bar" |
Redis配置文件参数说明
1.
Redis默认不是以守护进程的方式运行,可以通过该配置项修改,使用yes启用守护进程 daemonize
no2. 当Redis以守护进程方式运行时,Redis默认会把pid写入/var/run/redis.pid文件,可以通过pidfile指定 pidfile
/var/run/redis.pid3. 指定Redis监听端口,默认端口为6379,作者在自己的一篇博文中解释了为什么选用6379作为默认端口,因为6379在手机按键上MERZ对应的号码,而MERZ取自意大利歌女Alessia
Merz的名字 port
63794. 绑定的主机地址 bind
127.0.0.15.当 客户端闲置多长时间后关闭连接,如果指定为0,表示关闭该功能 timeout
3006. 指定日志记录级别,Redis总共支持四个级别:debug、verbose、notice、warning,默认为verbose loglevel
verbose7. 日志记录方式,默认为标准输出,如果配置Redis为守护进程方式运行,而这里又配置为日志记录方式为标准输出,则日志将会发送给/dev/null logfile
stdout8. 设置数据库的数量,默认数据库为0,可以使用SELECT <dbid>命令在连接上指定数据库id databases
169. 指定在多长时间内,有多少次更新操作,就将数据同步到数据文件,可以多个条件配合 save
<seconds> <changes> Redis默认配置文件中提供了三个条件: save
900 1 save
300 10 save
60 10000 分别表示900秒(15分钟)内有1个更改,300秒(5分钟)内有10个更改以及60秒内有10000个更改。 10.
指定存储至本地数据库时是否压缩数据,默认为yes,Redis采用LZF压缩,如果为了节省CPU时间,可以关闭该选项,但会导致数据库文件变的巨大 rdbcompression
yes11. 指定本地数据库文件名,默认值为dump.rdb dbfilename
dump.rdb12. 指定本地数据库存放目录 dir
./13. 设置当本机为slav服务时,设置master服务的IP地址及端口,在Redis启动时,它会自动从master进行数据同步 slaveof
<masterip> <masterport>14. 当master服务设置了密码保护时,slav服务连接master的密码 masterauth
<master-password>15. 设置Redis连接密码,如果配置了连接密码,客户端在连接Redis时需要通过AUTH <password>命令提供密码,默认关闭 requirepass
foobared16. 设置同一时间最大客户端连接数,默认无限制,Redis可以同时打开的客户端连接数为Redis进程可以打开的最大文件描述符数,如果设置
maxclients 0,表示不作限制。当客户端连接数到达限制时,Redis会关闭新的连接并向客户端返回max number of clients reached错误信息 maxclients
12817. 指定Redis最大内存限制,Redis在启动时会把数据加载到内存中,达到最大内存后,Redis会先尝试清除已到期或即将到期的Key,当此方法处理
后,仍然到达最大内存设置,将无法再进行写入操作,但仍然可以进行读取操作。Redis新的vm机制,会把Key存放内存,Value会存放在swap区 maxmemory
<bytes>18. 指定是否在每次更新操作后进行日志记录,Redis在默认情况下是异步的把数据写入磁盘,如果不开启,可能会在断电时导致一段时间内的数据丢失。因为
redis本身同步数据文件是按上面save条件来同步的,所以有的数据会在一段时间内只存在于内存中。默认为no appendonly
no19. 指定更新日志文件名,默认为appendonly.aof appendfilename
appendonly.aof20. 指定更新日志条件,共有3个可选值:
no:表示等操作系统进行数据缓存同步到磁盘(快)
always:表示每次更新操作后手动调用fsync()将数据写到磁盘(慢,安全)
everysec:表示每秒同步一次(折衷,默认值) appendfsync
everysec 21.
指定是否启用虚拟内存机制,默认值为no,简单的介绍一下,VM机制将数据分页存放,由Redis将访问量较少的页即冷数据swap到磁盘上,访问多的页面由磁盘自动换出到内存中(在后面的文章我会仔细分析Redis的VM机制) vm-enabled
no22. 虚拟内存文件路径,默认值为/tmp/redis.swap,不可多个Redis实例共享 vm-swap-file
/tmp/redis.swap23. 将所有大于vm-max-memory的数据存入虚拟内存,无论vm-max-memory设置多小,所有索引数据都是内存存储的(Redis的索引数据
就是keys),也就是说,当vm-max-memory设置为0的时候,其实是所有value都存在于磁盘。默认值为0 vm-max-memory
024. Redis swap文件分成了很多的page,一个对象可以保存在多个page上面,但一个page上不能被多个对象共享,vm-page-size是要根据存储的
数据大小来设定的,作者建议如果存储很多小对象,page大小最好设置为32或者64bytes;如果存储很大大对象,则可以使用更大的page,如果不 确定,就使用默认值 vm-page-size
3225. 设置swap文件中的page数量,由于页表(一种表示页面空闲或使用的bitmap)是在放在内存中的,,在磁盘上每8个pages将消耗1byte的内存。 vm-pages
13421772826. 设置访问swap文件的线程数,最好不要超过机器的核数,如果设置为0,那么所有对swap文件的操作都是串行的,可能会造成比较长时间的延迟。默认值为4 vm-max-threads
427. 设置在向客户端应答时,是否把较小的包合并为一个包发送,默认为开启 glueoutputbuf
yes28. 指定在超过一定的数量或者最大的元素超过某一临界值时,采用一种特殊的哈希算法 hash-max-zipmap-entries
64 hash-max-zipmap-value
51229. 指定是否激活重置哈希,默认为开启(后面在介绍Redis的哈希算法时具体介绍) activerehashing
yes30. 指定包含其它的配置文件,可以在同一主机上多个Redis实例之间使用同一份配置文件,而同时各个实例又拥有自己的特定配置文件 include
/path/to/local.conf
|
Centos开机自启动redis1、设置redis.conf中daemonize为yes,确保守护进程开启
# By default Redis does not run as a daemon. Use 'yes' if you need it. # Note that Redis will write a pid file in /var/run/redis.pid when daemonized. daemonize yes |
2、编写开机自启动脚本vi /etc/init.d/redis,内容如下;
# chkconfig: 2345 10 90 # description: Start and Stop redis PATH= /usr/local/bin : /sbin : /usr/bin : /bin REDISPORT=6379 #实际环境而定 EXEC= /usr/local/redis/src/redis-server #实际环境而定 REDIS_CLI= /usr/local/redis/src/redis-cli #实际环境而定 PIDFILE= /var/run/redis .pid CONF= "/usr/local/redis/redis.conf" #实际环境而定 case "$1" in start) if [
-f $PIDFILE ] then echo "$PIDFILE
exists, process is already running or crashed." else echo "Starting
Redis server..." $EXEC
$CONF fi if [ "$?" = "0" ] then echo "Redis
is running..." fi ;; stop) if [
! -f $PIDFILE ] then echo "$PIDFILE
exists, process is not running." else PID=$( cat $PIDFILE) echo "Stopping..." $REDIS_CLI
-p $REDISPORT SHUTDOWN while [
-x $PIDFILE ] do echo "Waiting
for Redis 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 |
3、写完后保存退出,并设置权限
4、启动测试
启动成功会提示如下信息:
Starting Redis server...
Redis is running...
使用redis-cli测试:
[root@hadoop0 ~]# /usr/redisbin/redis-cli
127.0.0.1:6379> set foo bar
OK
127.0.0.1:6379> get foo
"bar"127.0.0.1:6379> exit |
5、设置开机自启动
6、测试
[code]#
尝试启动或停止redisservice
redis start service
redis stop #
开启服务自启动 chkconfig
redis on |
[/code]
redis主从结构搭建主节点:192.168.60.128 hadoop0从节点:192.168.60.135 hadoop1注意:所有从节点的配置都一样方式1:手动修改配置文件1.修改配置文件中的slaveof属性
2.启动hadoop0上的redis,输入info命令查看配置信息
# Replicationrole:masterconnected_slaves:1slave0:ip=192.168.60.135,port=6379,state=online,offset=1188,lag=0master_repl_offset:1188repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:2repl_backlog_histlen:1187 |
3.启动hadoop1上的redis中,输入info命令查看配置信息
# Replicationrole:slavemaster_host:hadoop0master_port:6379master_link_status:upmaster_last_io_seconds_ago:8master_sync_in_progress:0slave_repl_offset:1356slave_priority:100slave_read_only:1connected_slaves:0master_repl_offset:0repl_backlog_active:0repl_backlog_size:1048576repl_backlog_first_byte_offset:0repl_backlog_histlen:0 |
方式2:动态设置分别启动hadoop0和hadoop1上的redis,进入客户端输入命令
127.0.0.1:6379> slaveof hadoop0 6379127.0.0.1:6379> info |
结束和上面的配置是一样的,只是此设置在当前设置有效,redis-server再次启动就失效了。
应对高并发,实现负载均衡,减少redis节点的压力,实现主从结构。主节点负责读写,从节点负责读。 |
Redis3.0集群部署文档(centos6.5系统)(要让集群正常工作至少需要3个主节点,在这里我们要创建6个redis节点,其中三个为主节点,三个为从节点,对应的redis节点的ip和端口对应关系如下)ip192.168.60.128 hostname hadoop0192.168.60.128:7000192.168.60.128:7001192.168.60.128:7002192.168.60.128:7003192.168.60.128:7004192.168.60.128:70051、下载redis。官网下载3.0.0版本以上,之前2.几的版本不支持集群模式2:上传服务器,解压,编译
tar -zxvf redis-3.0.0.tar.gzmv redis-3.0.0.tar.gz rediscd /usr/softinstall/redismakemake install |
3:创建集群需要的目录
mkdir -p /usr/softinstall/redis/clustercd /usr/softinstall/redis/clustermkdir 7000mkdir 7001mkdir 7002mkdir 7003mkdir 7004mkdir 7005 |
4:修改配置文件redis.conf
cp /usr/softinstall/redis/redis.conf /usr/softinstall/redis/clustervi redis.conf##修改配置文件中的下面选项port 7000daemonizeyescluster-enabled yescluster-config-file nodes.confcluster-node-timeout 5000appendonly yes##修改完redis.conf配置文件中的这些配置项之后把这个配置文件分别拷贝到7000/7001/7002/7003/7004/7005目录下面cp /usr/softinstall/redis/cluster/redis.conf /usr/softinstall/redis/cluster/7000cp /usr/softinstall/redis/cluster/redis.conf /usr/softinstall/redis/cluster/7001cp /usr/softinstall/redis/cluster/redis.conf /usr/softinstall/redis/cluster/7002cp /usr/softinstall/redis/cluster/redis.conf /usr/softinstall/redis/cluster/7003cp /usr/softinstall/redis/cluster/redis.conf /usr/softinstall/redis/cluster/7004cp /usr/softinstall/redis/cluster/redis.conf /usr/softinstall/redis/cluster/7005##注意:拷贝完成之后要修改7001/7002/7003/7004/7005目录下面redis.conf文件中的port参数,分别改为对应的文件夹的名称 |
5:在src目录下拷贝 redis-server到7000-7005文件夹中
cp /usr/softinstall/redis/cluster/redis-server /usr/softinstall/redis/cluster/7000cp /usr/softinstall/redis/cluster/redis-server /usr/softinstall/redis/cluster/7001cp /usr/softinstall/redis/cluster/redis-server /usr/softinstall/redis/cluster/7002cp /usr/softinstall/redis/cluster/redis-server /usr/softinstall/redis/cluster/7003cp /usr/softinstall/redis/cluster/redis-server /usr/softinstall/redis/cluster/7004cp /usr/softinstall/redis/cluster/redis-server /usr/softinstall/redis/cluster/7005拷贝redis-trib.rb到/usr/softinstall/redis/cluster/目录下cp /usr/softinstall/redis/cluster/redis-trib.rb /usr/softinstall/redis/cluster/ |
6:分别启动这6个redis实例
cd /usr/softinstall/redis/cluster/7000redis-server redis.confcd /usr/softinstall/redis/cluster/7001redis-server redis.confcd /usr/softinstall/redis/cluster/7002redis-server redis.confcd /usr/softinstall/redis/cluster/7003redis-server redis.confcd /usr/softinstall/redis/cluster/7004redis-server redis.confcd /usr/softinstall/redis/cluster/7005redis-server redis.conf##启动之后使用命令查看redis的启动情况ps-ef|grep redis |
7. 启动之后使用命令查看redis的启动情况
[root@hadoop0 cluster.lxk]# ps -ef | grep redisroot 4135 1 0 20:52 ?00:00:00 redis-server *:7000 [cluster]root 4140 1 0 20:53 ?00:00:00 redis-server *:7001 [cluster]root 4145 1 0 20:53 ?00:00:00 redis-server *:7002 [cluster]root 4151 1 0 20:53 ?00:00:00 redis-server *:7003 [cluster]root 4158 1 0 20:54 ?00:00:00 redis-server *:7004 [cluster]root 4164 1 0 20:54 ?00:00:00 redis-server *:7005 [cluster]root 4171 3437 0 20:54 pts/0 00:00:00 grep redis |
8:执行redis的创建集群命令创建集群
cd /usr/softinstall/redis/cluster[root@hadoop0 cluster.lxk]# ./redis-trib.rb create --replicas 1 hadoop0:7000 hadoop0:7001 hadoop0:7002 hadoop0:7003 hadoop0:7004 hadoop0:7005/usr/bin/env: ruby: No such file or directory | 8.1执行上面的命令的时候可能会报错,因为是执行的ruby的脚本,需要ruby的环境错误内容:/usr/bin/env: ruby: No such file or directory所以需要安装ruby的环境,这里推荐使用yuminstall ruby安装8.2然后再执行第6步的创建集群命令,可能还会报错,提示缺少rubygems组件,使用yum安装错误内容:./redis-trib.rb:24:in `require': no such file to load -- rubygems (LoadError)from ./redis-trib.rb:248.3再次执行第6步的命令,可能还会报错,提示不能加载redis,是因为缺少redis和ruby的接口,使用gem 安装错误内容:/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- redis (LoadError)from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'from ./redis-trib.rb:258.4 再次执行第6步的命令,正常执行输入yes。8.5 出现报错信息[root@hadoop0 cluster.lxk]# ./redis-trib.rb create --replicas 1 hadoop0:7000 hadoop0:7001 hadoop0:7002 hadoop0:7003 hadoop0:7004 hadoop0:7005>>> Creating cluster>>> Performing hash slots allocation on 6 nodes...Using 3 masters:hadoop0:7000hadoop0:7001hadoop0:7002Adding replica hadoop0:7003 to hadoop0:7000Adding replica hadoop0:7004 to hadoop0:7001Adding replica hadoop0:7005 to hadoop0:7002M: 176b543f8a72949cde08061a10dfab993c0f8268 hadoop0:7000slots:0-5460 (5461 slots) masterM: b41a2a2275bc96bd2624c5461f8546a0fc29bed5 hadoop0:7001slots:5461-10922 (5462 slots) masterM: 36301c1eaf5dddbb6aba8b763a6d7ce3931a9373 hadoop0:7002slots:10923-16383 (5461 slots) masterS: 28f360f009aad115b4ef4f947161726b16c20642 hadoop0:7003replicates 176b543f8a72949cde08061a10dfab993c0f8268S: 24fdb33794927e6464a7e5947a3a1e4778cea1fb hadoop0:7004replicates b41a2a2275bc96bd2624c5461f8546a0fc29bed5S: 5ae5b6ec6ea072a3efd6d42dfdc0350615a3d745 hadoop0:7005replicates 36301c1eaf5dddbb6aba8b763a6d7ce3931a9373Can I set the above configuration? (type 'yes' to accept): yes/usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis/client.rb:114:in `call': ERR Slot 4648 is already busy (Redis::CommandError)from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:2646:in `method_missing'from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:57:in `synchronize'from /usr/lib/ruby/1.8/monitor.rb:242:in `mon_synchronize'from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:57:in `synchronize'from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:2645:in `method_missing'from ./redis-trib.rb:212:in `flush_node_config'from ./redis-trib.rb:711:in `flush_nodes_config'from ./redis-trib.rb:710:in `each'from ./redis-trib.rb:710:in `flush_nodes_config'from ./redis-trib.rb:1209:in `create_cluster_cmd'from ./redis-trib.rb:1609:in `send'from ./redis-trib.rb:1609经检查,这是由于上一次配置集群失败时留下的配置信息导致的。 只要把redis.conf中定义的 cluster-config-file所在的文件删除,重新启动redis-server及运行redis-trib即可。 | 8.6 报错问题在执行一下集群命令的时候报错./redis-trib.rb create --replicas 1 hadoop0:7000 hadoop0:7001 hadoop0:7002 hadoop0:7003 hadoop0:7004 hadoop0:7005 |
>>> Sending CLUSTER MEET messages to join the cluster/usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis/client.rb:114:in `call': ERR Invalid node address specified: hadoop0:7000 (Redis::CommandError)from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:2646:in `method_missing'from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:57:in `synchronize'from /usr/lib/ruby/1.8/monitor.rb:242:in `mon_synchronize'from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:57:in `synchronize'from /usr/lib/ruby/gems/1.8/gems/redis-3.2.2/lib/redis.rb:2645:in `method_missing'from ./redis-trib.rb:746:in `join_cluster'from ./redis-trib.rb:744:in `each'from ./redis-trib.rb:744:in `join_cluster'from ./redis-trib.rb:1214:in `create_cluster_cmd'from ./redis-trib.rb:1609:in `send'from ./redis-trib.rb:1609 | 是redis本身的原因,还没有采用主机名解析的功能,我把hadoop0其改为其IP地址之后就成功了./redis-trib.rb create --replicas 1 192.168.60.128:7000 192.168.60.128:7001 192.168.60.128:7002 192.168.60.128:7003 192.168.60.128:7004 192.168.60.128:7005 |
[root@hadoop0 cluster.lxk]# ./redis-trib.rb create --replicas 1 192.168.60.128:7000192.168.60.128:7001 192.168.60.128:7002 192.168.60.128:7003 192.168.60.128:7004 192.168.60.128:7005>>> Creating cluster>>> Performing hash slots allocation on 6 nodes...Using 3 masters:192.168.60.128:7000192.168.60.128:7001192.168.60.128:7002Adding replica 192.168.60.128:7003 to 192.168.60.128:7000Adding replica 192.168.60.128:7004 to 192.168.60.128:7001Adding replica 192.168.60.128:7005 to 192.168.60.128:7002M: f846eefc456c4d58a2e16e0c22cc3efaaeebe2b8 192.168.60.128:7000slots:0-5460 (5461 slots) masterM: 63af0a05b3a4620888fe3144c9a67044ea4b67b5 192.168.60.128:7001slots:5461-10922 (5462 slots) masterM: 19bb8e6aae6f437ca4b2eb08dade49f81ce7d66a 192.168.60.128:7002slots:10923-16383 (5461 slots) masterS: 4fca799bbfcfc75316a7d42e6110fe33dce74c59 192.168.60.128:7003replicates f846eefc456c4d58a2e16e0c22cc3efaaeebe2b8S: d1e239f90808dcd2e7a6ebb49814d9af83c9d3f3 192.168.60.128:7004replicates 63af0a05b3a4620888fe3144c9a67044ea4b67b5S: 5ac0ea2bd96db0c70c290bb5da001ee3526cf90a 192.168.60.128:7005replicates 19bb8e6aae6f437ca4b2eb08dade49f81ce7d66aCan I set the above configuration? (type 'yes' to accept): yes>>> Nodes configuration updated>>> Assign a different config epoch to each node>>> Sending CLUSTER MEET messages to join the clusterWaiting for the cluster to join.....>>> Performing Cluster Check (using node 192.168.60.128:7000)M: f846eefc456c4d58a2e16e0c22cc3efaaeebe2b8 192.168.60.128:7000slots:0-5460 (5461 slots) masterM: 63af0a05b3a4620888fe3144c9a67044ea4b67b5 192.168.60.128:7001slots:5461-10922 (5462 slots) masterM: 19bb8e6aae6f437ca4b2eb08dade49f81ce7d66a 192.168.60.128:7002slots:10923-16383 (5461 slots) masterM: 4fca799bbfcfc75316a7d42e6110fe33dce74c59 192.168.60.128:7003slots: (0 slots) masterreplicates f846eefc456c4d58a2e16e0c22cc3efaaeebe2b8M: d1e239f90808dcd2e7a6ebb49814d9af83c9d3f3 192.168.60.128:7004slots: (0 slots) masterreplicates 63af0a05b3a4620888fe3144c9a67044ea4b67b5M: 5ac0ea2bd96db0c70c290bb5da001ee3526cf90a 192.168.60.128:7005slots: (0 slots) masterreplicates 19bb8e6aae6f437ca4b2eb08dade49f81ce7d66a[OK] All nodes agree about slots configuration.>>> Check for open slots...>>> Check slots coverage...[OK] All 16384 slots covered. |
| 集群搭建成功! |
Redis3.0集群节点添加1:首先把需要添加的节点启动
在之前集群节点的基础上,cd /usr/softinstall/redis/clustercp -r 7000 7006留下redis.conf 和 redis-server,删除其他文件修改redis.conf文件把中他端口号改为7006 (与文件名相同的)启动节点redis-server redis.conf |
2:执行以下命令,将这个新节点添加到集群中
redis-trib.rb add-node 192.168.60.128:7006 192.168.60.128:7001 |
3:执行命令redis-cli-c -p 7001 cluster nodes,查看刚才新增的节点
[root@hadoop0 cluster.lxk]# redis-cli -c -p 7001 cluster nodes4fca799bbfcfc75316a7d42e6110fe33dce74c59 192.168.60.128:7003 slave f846eefc456c4d58a2e16e0c22cc3efaaeebe2b8 0 1451032623155 4 connected5ac0ea2bd96db0c70c290bb5da001ee3526cf90a 192.168.60.128:7005 slave 19bb8e6aae6f437ca4b2eb08dade49f81ce7d66a 0 1451032624175 6 connectedd1e239f90808dcd2e7a6ebb49814d9af83c9d3f3 192.168.60.128:7004 slave 63af0a05b3a4620888fe3144c9a67044ea4b67b5 0 1451032621110 5 connected4037989e0baafd19604c5654ca76cb8618790232 192.168.60.128:7006 master - 0 1451032622437 7 connected 0-332 5461-5794 10923-11255f846eefc456c4d58a2e16e0c22cc3efaaeebe2b8 192.168.60.128:7000 master - 0 1451032620086 1 connected 333-5460b667fda0212483551a1b1de995ed95927eb6761a 192.168.60.128:7007 master - 0 1451032622133 0 connected19bb8e6aae6f437ca4b2eb08dade49f81ce7d66a 192.168.60.128:7002 master - 0 1451032619678 3 connected 11256-1638363af0a05b3a4620888fe3144c9a67044ea4b67b5 192.168.60.128:7001 myself,master - 0 0 2 connected 5795-10922 |
4:增加了新的节点之后,这个新的节点可以成为主节点或者是从节点
4.1 把这个节点变成主节点,使用redis-trib程序,将集群中的某些哈希槽移动到新节点里面, 这个新节点就成为真正的主节点了。执行下面的命令对集群中的哈希槽进行移动./redis-trib.rb reshard 192.168.60.128:7000 | 系统会提示我们要移动多少哈希槽,这里移动1000个 |
参考连接