内容：
Redis 编译安装
Redis Cluster部署
Redis 集群扩容
Redis 指定机器下线
环境：
主机名 IP
node1 192.168.10.1
node2 192.168.10.2
node3 192.168.10.3
node4 192.168.10.4
node5 192.168.10.5
node6 192.168.10.6编译安装 redis-4.0.14.tar.gz ，确认时间同步（node1~node6）
[root@node1 ~]# tar xf redis-4.0.14.tar.gz
[root@node1 ~]# cd redis-4.0.14/
[root@node1 redis-4.0.14]# make PREFIX=/apps/redis install
[root@node1 redis-4.0.14]# mkdir -p /apps/redis/{etc,log,data,run}
[root@node1 redis-4.0.14]# cp redis.conf /apps/redis/etc/
[root@node1 redis-4.0.14]# sed -i 's@logfile ""@logfile "/apps/redis/log/redis.log"@' /apps/redis/etc/redis.conf创建 redis 用户（node1~node6）
[root@node1 ~]# useradd -r redis -s /sbin/nologin编写服务管理配置文件（node1~node6）
[root@node1 ~]# vim /usr/lib/systemd/system/redis.service
[Unit]
Description=Redis persistent key-value database
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
ExecStart=/apps/redis/bin/redis-server /apps/redis/etc/redis.conf --supervised systemd
ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/bin/kill -s QUIT $MAINPID
Type=notify
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755
[Install]
WantedBy=multi-user.target启动服务（node1~node6）
[root@node1 ~]# chown -R redis.redis /apps/redis
[root@node1 ~]# systemctl daemon-reload
[root@node1 ~]# systemctl start redis
[root@node1 ~]# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 128 127.0.0.1:6379 *:*
LISTEN 0 128 *:111 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::]:111 [::]:*
LISTEN 0 128 [::]:22 [::]:* 查看日志并解决启动警告（node1~node6）
[root@node1 ~]# cat /apps/redis/log/redis.log
41347:C 13 Nov 17:08:52.446 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
41347:C 13 Nov 17:08:52.447 # Redis version=4.0.14, bits=64, commit=00000000, modified=0, pid=41347, just started
41347:C 13 Nov 17:08:52.447 # Configuration loaded
41347:C 13 Nov 17:08:52.447 * supervised by systemd, will signal readiness
41347:M 13 Nov 17:08:52.455 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
41347:M 13 Nov 17:08:52.455 # Server can't set maximum open files to 10032 because of OS error: Operation not permitted.
41347:M 13 Nov 17:08:52.455 # Current maximum open files is 4096. maxclients has been reduced to 4064 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 4.0.14 (00000000/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in standalone mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379
| `-._ `._ / _.-' | PID: 41347
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
41347:M 13 Nov 17:08:52.462 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
41347:M 13 Nov 17:08:52.463 # Server initialized
41347:M 13 Nov 17:08:52.463 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
41347:M 13 Nov 17:08:52.463 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
41347:M 13 Nov 17:08:52.464 * Ready to accept connections第一个警告提示： redis 设置了 TCP backlog 的值为 511， 但是 linux 内核中当前值为 128，达不到 redis 要求
第二个警告提示： Linux 中内存申请方式需要重 0 修改为 1 ，确保 redis 可以申请更多的物理内容
[root@node1 ~]# vim /etc/sysctl.conf
[root@node1 ~]# sysctl -p
net.core.somaxconn = 512
vm.overcommit_memory = 1第三个警告提示： 关闭 Linux 的 transparent hugepage 功能，根据警告提示操作即可
[root@node1 ~]# echo never > /sys/kernel/mm/transparent_hugepage/enabled
[root@node1 ~]# echo "echo never > /sys/kernel/mm/transparent_hugepage/enabled" >> /etc/rc.local
[root@node1 ~]# chmod +x /etc/rc.local处理完警告后，清空 redis 日志并重启 redis，警告信息消失（node1~node6）
[root@node1 ~]# rm -rf /apps/redis/log/redis.log
[root@node1 ~]# systemctl restart redis
[root@node1 ~]# cat /apps/redis/log/redis.log
41545:C 13 Nov 19:02:23.537 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
41545:C 13 Nov 19:02:23.537 # Redis version=4.0.14, bits=64, commit=00000000, modified=0, pid=41545, just started
41545:C 13 Nov 19:02:23.537 # Configuration loaded
41545:C 13 Nov 19:02:23.537 * supervised by systemd, will signal readiness
41545:M 13 Nov 19:02:23.541 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
41545:M 13 Nov 19:02:23.541 # Server can't set maximum open files to 10032 because of OS error: Operation not permitted.
41545:M 13 Nov 19:02:23.541 # Current maximum open files is 4096. maxclients has been reduced to 4064 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 4.0.14 (00000000/0) 64 bit
.-`` .-```. ```\/ _.,_ ''-._
( ' , .-` | `, ) Running in standalone mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379
| `-._ `._ / _.-' | PID: 41545
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
41545:M 13 Nov 19:02:23.550 # Server initialized
41545:M 13 Nov 19:02:23.551 * Ready to accept connections
配置 redis 的 PATH 环境变量，使用 redis-cli 进行连接测试（node1~node6）
[root@node1 ~]# vim /etc/profile.d/redis.sh
#!/bin/bash
export PATH=/apps/redis/bin:$PATH
[root@node1 ~]# source /etc/profile.d/redis.sh
编辑 redis 配置文件，过滤所有注释选项后，如下（node1~node6）
[root@node1 ~]# vim /apps/redis/etc/redis.conf
[root@node1 ~]# cat /apps/redis/etc/redis.conf | grep -Ev "^#|^$"
bind 192.168.10.1 # 此项设置为每台服务器本机的 ip 地址，其余都相同
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize yes
supervised no
pidfile /apps/redis/run/redis_6379.pid
loglevel notice
logfile "/apps/redis/log/redis.log"
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /apps/redis/data/
masterauth 1
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 1
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
slave-lazy-flush no
appendonly no
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
aof-use-rdb-preamble no
lua-time-limit 5000
cluster-enabled yes
cluster-config-file nodes-6379.conf
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 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
重启 redis 服务，并查看端口（node1~node6）
[root@node1 ~]# systemctl restart redis
[root@node1 ~]# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 511 192.168.10.1:16379 *:*
LISTEN 0 511 192.168.10.1:6379 *:*
LISTEN 0 128 *:111 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::]:111 [::]:*
LISTEN 0 128 [::]:22 [::]:*
以上是所有服务器的基本配置，接下来配置 Redis Cluster 部分
在 node1 服务器上编译安装 redis 集群管理工具
[root@node1 ~]# yum -y install gcc make zlib-devel readline-devel gdbm-devel
[root@node1 ~]# tar xf ruby-2.5.5.tar.gz
[root@node1 ~]# cd ruby-2.5.5/
[root@node1 ruby-2.5.5]# ./configure
[root@node1 ruby-2.5.5]# make -j 2
[root@node1 ruby-2.5.5]# make install
[root@node1 ruby-2.5.5]# gem install redis
ERROR: While executing gem ... (Gem::Exception)
Unable to require openssl, install OpenSSL and rebuild Ruby (preferred) or use non-HTTPS sources
解决办法：
[root@node1 ruby-2.5.5]# yum -y install openssl-devel
[root@node1 ruby-2.5.5]# cd ext/openssl/
[root@node1 openssl]# pwd
/root/ruby-2.5.5/ext/openssl
[root@node1 openssl]# ruby ./extconf.rb
[root@node1 openssl]# make
compiling openssl_missing.c
make: *** No rule to make target `/include/ruby.h', needed by `ossl.o'. Stop.
在Makefile顶部中的增加top_srcdir = ../..
[root@node1 openssl]# vim Makefile
[root@node1 openssl]# head -1 Makefile
top_srcdir = ../..
再次执行make
[root@node1 openssl]# make
[root@node1 openssl]# make install
[root@node1 openssl]# cd /root/ruby-2.5.5/
[root@node1 ruby-2.5.5]# gem install redis
Fetching: redis-4.1.3.gem (100%)
Successfully installed redis-4.1.3
Parsing documentation for redis-4.1.3
Installing ri documentation for redis-4.1.3
Done installing documentation for redis after 1 seconds
1 gem installed
修改配置文件，将密码修改为 redis 的密码
[root@node1 ruby-2.5.5]# vim /usr/local/lib/ruby/gems/2.5.0/gems/redis-4.1.3/lib/redis/client.rb
[root@node1 ruby-2.5.5]# cat /usr/local/lib/ruby/gems/2.5.0/gems/redis-4.1.3/lib/redis/client.rb | grep ":password "
:password => 1,
使用 redis 集群管理工具启动 redis 集群, create 代表创建集群， replicas 代表每个redis 主节点有几个从节点，最后添加所有的 redis 服务 地址， 提示输入时，输入 yes 即可
[root@node1 ~]# cp ./redis-4.0.14/src/redis-trib.rb /usr/sbin/
[root@node1 ~]# redis-trib.rb
Usage: redis-trib <command> <options> <arguments ...>
create host1:port1 ... hostN:portN
--replicas <arg>
check host:port
info host:port
fix host:port
--timeout <arg>
reshard host:port
--from <arg>
--to <arg>
--slots <arg>
--yes
--timeout <arg>
--pipeline <arg>
rebalance host:port
--weight <arg>
--auto-weights
--use-empty-masters
--timeout <arg>
--simulate
--pipeline <arg>
--threshold <arg>
add-node new_host:new_port existing_host:existing_port
--slave
--master-id <arg>
del-node host:port node_id
set-timeout host:port milliseconds
call host:port command arg arg .. arg
import host:port
--from <arg>
--copy
--replace
help (show this help)
[root@node1 ~]# redis-trib.rb create --replicas 1 192.168.10.1:6379 192.168.10.2:6379 192.168.10.3:6379 192.168.10.4:6379 192.168.10.5:6379 192.168.10.6:6379
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.10.1:6379
192.168.10.2:6379
192.168.10.3:6379
Adding replica 192.168.10.5:6379 to 192.168.10.1:6379
Adding replica 192.168.10.6:6379 to 192.168.10.2:6379
Adding replica 192.168.10.4:6379 to 192.168.10.3:6379
M: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots:0-5460 (5461 slots) master
M: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots:5461-10922 (5462 slots) master
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
S: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
replicates ea5b2c985511241879f17d84d462888a24d20590
S: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
replicates 0a45c94458e8a5d751275e252c40c280ff78527e
Can 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 cluster
Waiting for the cluster to join...
>>> Performing Cluster Check (using node 192.168.10.1:6379)
M: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots: (0 slots) slave
replicates 0a45c94458e8a5d751275e252c40c280ff78527e
S: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots: (0 slots) slave
replicates ea5b2c985511241879f17d84d462888a24d20590
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
通过上面的信息可以知道
主 从
node1-10.1 node5-10.5
node2-10.2 node6-10.6
node3-10.3 node4-10.4
登录 reids 查看集群状态
[root@node1 ~]# redis-cli -h 192.168.10.1
192.168.10.1:6379> cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:887
cluster_stats_messages_pong_sent:932
cluster_stats_messages_sent:1819
cluster_stats_messages_ping_received:927
cluster_stats_messages_pong_received:887
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:1819
测试 redis 集群中主从节点是否具备自动切换功能
node5 是 node1 的 slave，停止 node1 中的 redis 服务，查看 node6 是否可以提升为主节点
[root@node1 ~]# systemctl stop redis
[root@node1 ~]# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 128 *:111 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::]:111 [::]:*
LISTEN 0 128 [::]:22 [::]:*
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
[ERR] Sorry, can't connect to node 192.168.10.1:6379
[root@node1 ~]# redis-trib.rb check 192.168.10.2:6379
>>> Performing Cluster Check (using node 192.168.10.2:6379)
M: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots: (0 slots) slave
replicates 0a45c94458e8a5d751275e252c40c280ff78527e
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
0 additional replica(s)
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@node1 ~]# redis-cli -h 192.168.10.5
192.168.10.5:6379> auth 1
OK
192.168.10.5:6379> info replication
# Replication
role:master
connected_slaves:0
master_replid:10965c763fab20cf1f99bfdd15cd0a8d66b9fd83
master_replid2:5fc2e3dc70d7e127cf67f6b1da6b6ce65b592ca3
master_repl_offset:1694
second_repl_offset:1695
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1694
192.168.10.5:6379> exit
[root@node1 ~]# systemctl start redis
[root@node1 ~]# redis-trib.rb check 192.168.10.2:6379
>>> Performing Cluster Check (using node 192.168.10.2:6379)
M: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots: (0 slots) slave
replicates 0a45c94458e8a5d751275e252c40c280ff78527e
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@node1 ~]# redis-cli -h 192.168.10.1
192.168.10.1:6379> auth 1
OK
192.168.10.1:6379> info replication
# Replication
role:slave
master_host:192.168.10.5
master_port:6379
master_link_status:up
master_last_io_seconds_ago:2
master_sync_in_progress:0
slave_repl_offset:1792
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:10965c763fab20cf1f99bfdd15cd0a8d66b9fd83
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1792
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1695
repl_backlog_histlen:98
192.168.10.1:6379> exit
上面我们通过手动关闭主节点 node1 的 redis 服务，发现 node5 自动提升为主节点，使用集群管理工具的 check 命令查看当前集群状态，之后我们有重新启动 node1 的 redis 服务，发现 node1 成为 node5 的从几点。验证 cluster 集群的自动切换成功
测试在 node2 的 redis 中进行数据写入操作
[root@node1 ~]# redis-cli -h 192.168.10.2
192.168.10.2:6379> auth 1
OK
192.168.10.2:6379> set name yinx1n
OK
192.168.10.2:6379> get name
"yinx1n"
192.168.10.2:6379> set addr beijing
(error) MOVED 12790 192.168.10.3:6379
192.168.10.2:6379> info replication
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.10.6,port=6379,state=online,offset=2802,lag=1
master_replid:5d118a1fa4379ac4c4b49ade8dfc4361ac08038e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:2802
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:2802
192.168.10.2:6379> exit
上面的操作中，name 这个 key 被分配到了 node2 节点，可以写入，但是 addr 这个 key 被分配到 node3 中，因此在 node2 中无法写入
[root@node1 ~]# redis-cli -h 192.168.10.3
192.168.10.3:6379> auth 1
OK
192.168.10.3:6379> set addr beijing
OK
192.168.10.3:6379> get addr
"beijing"
192.168.10.3:6379> exit
[root@node1 ~]# redis-cli -h 192.168.10.6
192.168.10.6:6379> auth 1
OK
192.168.10.6:6379> get name
(error) MOVED 12790 192.168.10.2:6379
192.168.10.3:6379> exit
在 node 2 中写入的数据在 node6 中无法访问，接下来手动关闭 node2 的 redis 服务，然后再次访问 node6
[root@node2 ~]# systemctl stop redis
[root@node1 ~]# redis-cli -h 192.168.10.6
192.168.10.6:6379> auth 1
OK
192.168.10.6:6379> info replication
# Replication
role:master
connected_slaves:0
master_replid:45f8d7daf292fb3cb4cdd2aa6cb96449e0c45b63
master_replid2:5d118a1fa4379ac4c4b49ade8dfc4361ac08038e
master_repl_offset:3208
second_repl_offset:3209
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:3208
192.168.10.6:6379> get name
"yinx1n"
192.168.10.6:6379> exit
验证完成以后，发现 cluster 的从节点不具备访问功能，进作为数据备份使用，接下来重启 node2
[root@node2 ~]# systemctl start redis
重启后查看集群状态
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
可以发现关闭 redis 服务的节点，再重启 redis 服务的话，会变成从节点
Redis集群扩容
使用 redis 集群时，有的时候需要新增 redis 节点，提高性能。我们新准备两台服务器，要求和之前的 6 台配置相同
node7——192.168.10.7 node8——192.168.10.8
启动 node7 和 node8 的 redis 服务
node7：
[root@node7 ~]# systemctl start redis
[root@node7 ~]# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 511 192.168.10.7:16379 *:*
LISTEN 0 511 192.168.10.7:6379 *:*
LISTEN 0 128 *:111 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::]:111 [::]:*
LISTEN 0 128 [::]:22 [::]:*
node8：
[root@node8 ~]# systemctl start redis
[root@node8 ~]# ss -ntl
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 100 127.0.0.1:25 *:*
LISTEN 0 511 192.168.10.8:16379 *:*
LISTEN 0 511 192.168.10.8:6379 *:*
LISTEN 0 128 *:111 *:*
LISTEN 0 128 *:22 *:*
LISTEN 0 100 [::1]:25 [::]:*
LISTEN 0 128 [::]:111 [::]:*
LISTEN 0 128 [::]:22 [::]:*
查看集群状态
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
添加 node7， add-node 命令后添加 node7 和一个原来集群主节点的地址
[root@node1 ~]# redis-trib.rb add-node 192.168.10.7:6379 192.168.10.3:6379
>>> Adding node 192.168.10.7:6379 to cluster 192.168.10.3:6379
>>> Performing Cluster Check (using node 192.168.10.3:6379)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
[OK] All nodes agree about slots configuration.
再次查看集群状态，node7 被添加成主节点
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 39532b5439b378bb36b4b281e545b8b6604917af 192.168.10.7:6379
slots: (0 slots) master
0 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@node1 ~]# redis-trib.rb info 192.168.10.1:6379
192.168.10.6:6379 (46152079...) -> 1 keys | 5462 slots | 1 slaves.
192.168.10.3:6379 (bbe35416...) -> 1 keys | 5461 slots | 1 slaves.
192.168.10.7:6379 (39532b54...) -> 0 keys | 0 slots | 0 slaves.
192.168.10.5:6379 (9519fb41...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 2 keys in 4 masters.
0.00 keys per slot on average.
添加 node8 到集群中
[root@node1 ~]# redis-trib.rb add-node 192.168.10.8:6379 192.168.10.4:6379
>>> Adding node 192.168.10.8:6379 to cluster 192.168.10.4:6379
>>> Performing Cluster Check (using node 192.168.10.4:6379)
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 39532b5439b378bb36b4b281e545b8b6604917af 192.168.10.7:6379
slots: (0 slots) master
0 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
>>> Send CLUSTER MEET to node 192.168.10.8:6379 to make it join the cluster.
[OK] New node added correctly.
查看集群状态，node8 也为主节点
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:5461-10922 (5462 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:10923-16383 (5461 slots) master
1 additional replica(s)
M: 39532b5439b378bb36b4b281e545b8b6604917af 192.168.10.7:6379
slots: (0 slots) master
0 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: 7e462b96b548ae2dc1512c71765c58493362671f 192.168.10.8:6379
slots: (0 slots) master
0 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
登录 node8 的 redis，将它的 master 设置为 node7
[root@node1 ~]# redis-cli -h 192.168.10.8
192.168.10.8:6379> auth 1
OK
192.168.10.8:6379> info replication
# Replication
role:master
connected_slaves:0
master_replid:09db3148943fdf8cacb8de0a73ad021833c99393
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
192.168.10.8:6379> cluster nodes
39532b5439b378bb36b4b281e545b8b6604917af 192.168.10.7:6379@16379 master - 0 1573735372000 9 connected
bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379@16379 master - 0 1573735374000 3 connected 10923-16383
7e462b96b548ae2dc1512c71765c58493362671f 192.168.10.8:6379@16379 myself,master - 0 1573735372000 0 connected
dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379@16379 slave bbe35416650b74b326bc6657d2ff18cc6edc14ce 0 1573735375000 3 connected
461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379@16379 master - 0 1573735373695 8 connected 5461-10922
9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379@16379 master - 0 1573735373000 7 connected 0-5460
ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379@16379 slave 9519fb412b0199e2764f1d14f951194eb758e967 0 1573735375708 7 connected
0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379@16379 slave 461520796edb41baea82eadf8a99da26a2d77d34 0 1573735374702 8 connected
192.168.10.8:6379> cluster replicate 39532b5439b378bb36b4b281e545b8b6604917af # 将其设置为 slave，命令为 cluster replicate MASTERID
OK
192.168.10.8:6379> cluster nodes
39532b5439b378bb36b4b281e545b8b6604917af 192.168.10.7:6379@16379 master - 0 1573735411924 9 connected
bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379@16379 master - 0 1573735409000 3 connected 10923-16383
7e462b96b548ae2dc1512c71765c58493362671f 192.168.10.8:6379@16379 myself,slave 39532b5439b378bb36b4b281e545b8b6604917af 0 1573735405000 0 connected
dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379@16379 slave bbe35416650b74b326bc6657d2ff18cc6edc14ce 0 1573735410000 3 connected
461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379@16379 master - 0 1573735407901 8 connected 5461-10922
9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379@16379 master - 0 1573735410000 7 connected 0-5460
ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379@16379 slave 9519fb412b0199e2764f1d14f951194eb758e967 0 1573735410917 7 connected
0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379@16379 slave 461520796edb41baea82eadf8a99da26a2d77d34 0 1573735409911 8 connected
192.168.10.8:6379> info replication
# Replication
role:slave
master_host:192.168.10.7
master_port:6379
master_link_status:up
master_last_io_seconds_ago:10
master_sync_in_progress:0
slave_repl_offset:42
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:927b8e47cb7d76cdf6fcaf69d92ce7eb2fa99229
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:42
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:42
192.168.10.8:6379> exit
[root@node1 ~]# redis-trib.rb info 192.168.10.1:6379
192.168.10.6:6379 (46152079...) -> 1 keys | 5462 slots | 1 slaves.
192.168.10.3:6379 (bbe35416...) -> 1 keys | 5461 slots | 1 slaves.
192.168.10.7:6379 (39532b54...) -> 0 keys | 0 slots | 1 slaves.
192.168.10.5:6379 (9519fb41...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 2 keys in 4 masters.
0.00 keys per slot on average.
分配槽位
现在 node7 已经添加进集群且为主节点， 但是没有槽位，下面我们重新分配一下槽位使用集群的 reshard 命令前，请清空所有节点的数据，然后再从新分配。因此需要提前备份 redis 数据。
[root@node1 ~]# redis-trib.rb reshard 192.168.10.1:6379
提示重新分配大小输入 4096
选择要分配给 node7 的 id 号
选择重所有主节点分配： all # 这里也可以选择某个主节点的 ID，然后输入 done 进行槽位分配
[root@node1 ~]# redis-trib.rb info 192.168.10.1:6379
192.168.10.6:6379 (46152079...) -> 0 keys | 3817 slots | 1 slaves.
192.168.10.3:6379 (bbe35416...) -> 0 keys | 4067 slots | 1 slaves.
192.168.10.7:6379 (39532b54...) -> 0 keys | 4432 slots | 1 slaves.
192.168.10.5:6379 (9519fb41...) -> 0 keys | 4068 slots | 1 slaves.
[OK] 0 keys in 4 masters.
0.00 keys per slot on average.
下线 Redis 集群中的指定服务器（例如 node7）
先将 node7 的槽位全部移动到 node3 中（必须是主节点）
[root@node1 ~]# redis-trib.rb reshard 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:7106-10922 (3817 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:12317-16383 (4067 slots) master
1 additional replica(s)
M: 39532b5439b378bb36b4b281e545b8b6604917af 192.168.10.7:6379
slots:0-1392,5461-7105,10923-12316 (4432 slots) master
1 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:1393-5460 (4068 slots) master
1 additional replica(s)
S: 7e462b96b548ae2dc1512c71765c58493362671f 192.168.10.8:6379
slots: (0 slots) slave
replicates 39532b5439b378bb36b4b281e545b8b6604917af
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 4432 # 输入 node7 的槽位数
What is the receiving node ID? bbe35416650b74b326bc6657d2ff18cc6edc14ce # 这里输入 node3 的 ID
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #1:39532b5439b378bb36b4b281e545b8b6604917af # 这里输入 node7 的 ID
Source node #2:done
[root@node1 ~]# redis-trib.rb info 192.168.10.1:6379
192.168.10.6:6379 (46152079...) -> 0 keys | 3817 slots | 1 slaves.
192.168.10.3:6379 (bbe35416...) -> 0 keys | 8499 slots | 2 slaves.
192.168.10.7:6379 (39532b54...) -> 0 keys | 0 slots | 0 slaves.
192.168.10.5:6379 (9519fb41...) -> 0 keys | 4068 slots | 1 slaves.
[OK] 0 keys in 4 masters.
0.00 keys per slot on average.
使用集群命令删除 node7 节点
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:7106-10922 (3817 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:0-1392,5461-7105,10923-16383 (8499 slots) master
2 additional replica(s)
M: 39532b5439b378bb36b4b281e545b8b6604917af 192.168.10.7:6379
slots: (0 slots) master
0 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:1393-5460 (4068 slots) master
1 additional replica(s)
S: 7e462b96b548ae2dc1512c71765c58493362671f 192.168.10.8:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@node1 ~]# redis-trib.rb del-node 192.168.10.1:6379 39532b5439b378bb36b4b281e545b8b6604917af # 后面跟上 node7 的 ID
>>> Removing node 39532b5439b378bb36b4b281e545b8b6604917af from cluster 192.168.10.1:6379
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[root@node1 ~]# redis-trib.rb info 192.168.10.1:6379
192.168.10.6:6379 (46152079...) -> 0 keys | 3817 slots | 1 slaves.
192.168.10.3:6379 (bbe35416...) -> 0 keys | 8499 slots | 2 slaves.
192.168.10.5:6379 (9519fb41...) -> 0 keys | 4068 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.00 keys per slot on average.
删除 node7 的从节点 node8
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:7106-10922 (3817 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:0-1392,5461-7105,10923-16383 (8499 slots) master
2 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:1393-5460 (4068 slots) master
1 additional replica(s)
S: 7e462b96b548ae2dc1512c71765c58493362671f 192.168.10.8:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@node1 ~]# redis-trib.rb del-node 192.168.10.1:6379 7e462b96b548ae2dc1512c71765c58493362671f # 后面跟上 node8 的 ID
>>> Removing node 7e462b96b548ae2dc1512c71765c58493362671f from cluster 192.168.10.1:6379
>>> Sending CLUSTER FORGET messages to the cluster...
>>> SHUTDOWN the node.
[root@node1 ~]# redis-trib.rb check 192.168.10.1:6379
>>> Performing Cluster Check (using node 192.168.10.1:6379)
S: ea5b2c985511241879f17d84d462888a24d20590 192.168.10.1:6379
slots: (0 slots) slave
replicates 9519fb412b0199e2764f1d14f951194eb758e967
M: 461520796edb41baea82eadf8a99da26a2d77d34 192.168.10.6:6379
slots:7106-10922 (3817 slots) master
1 additional replica(s)
M: bbe35416650b74b326bc6657d2ff18cc6edc14ce 192.168.10.3:6379
slots:0-1392,5461-7105,10923-16383 (8499 slots) master
1 additional replica(s)
S: 0a45c94458e8a5d751275e252c40c280ff78527e 192.168.10.2:6379
slots: (0 slots) slave
replicates 461520796edb41baea82eadf8a99da26a2d77d34
S: dd88beffe2da38f1f6f56664e2b00139d67061ef 192.168.10.4:6379
slots: (0 slots) slave
replicates bbe35416650b74b326bc6657d2ff18cc6edc14ce
M: 9519fb412b0199e2764f1d14f951194eb758e967 192.168.10.5:6379
slots:1393-5460 (4068 slots) master
1 additional replica(s)
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.