CentOS8 redis5 集群安装，配置，停止，重建，自启动

Dear 丶 2023-05-28 05:02 3阅读 0赞

环境：CentOS8

版本：redis-5.0.8

# 一、下载 #

[https://redis.io/download][https_redis.io_download]

[http://download.redis.io/releases/][http_download.redis.io_releases]

# 二、说明 #

redis5.0版本之后可以直接使用redis-cli命令创建集群，不使用redis-trib.rb命令了。

本文在一台主机上建立3主3从集群。实际最少需要3台服务器，6个节点。当然6个服务器更好了。

rdb和aof可以同时开启。如果只做缓存，可以不开启aof。

## Redis 集群的数据分片 ##

Redis 集群没有使用一致性hash, 而是引入了 **哈希槽**的概念.

Redis 集群有16384个哈希槽,每个key通过CRC16校验后对16384取模来决定放置哪个槽.集群的每个节点负责一部分hash槽,举个例子,比如当前集群有3个节点,那么:

*  节点 A 包含 0 到 5500号哈希槽.
 *  节点 B 包含5501 到 11000 号哈希槽.
 *  节点 C 包含11001 到 16384号哈希槽.

这种结构很容易添加或者删除节点. 比如如果我想新添加个节点D, 我需要从节点 A, B, C中得部分槽到D上. 如果我想移除节点A,需要将A中的槽移到B和C节点上,然后将没有任何槽的A节点从集群中移除即可. 由于从一个节点将哈希槽移动到另一个节点并不会停止服务,所以无论添加删除或者改变某个节点的哈希槽的数量都不会造成集群不可用的状态.

## Redis 集群的目标 ##

Redis 集群是 Redis 的一个分布式实现，主要是为了实现以下这些目标（按在设计中的重要性排序）：

*  在1000个节点的时候仍能表现得很好并且可扩展性（scalability）是线性的。
 *  没有合并操作，这样在 Redis 的数据模型中最典型的大数据值中也能有很好的表现。
 *  写入安全（Write safety）：那些与大多数节点相连的客户端所做的写入操作，系统尝试全部都保存下来。不过公认的，还是会有小部分（small windows?）写入会丢失。
 *  可用性（Availability）：在绝大多数的主节点（master node）是可达的，并且对于每一个不可达的主节点都至少有一个它的从节点（slave）可达的情况下，Redis 集群仍能进行分区（partitions）操作。

## 实现的功能子集 ##

Redis 集群实现了所有在非分布式 Redis 版本中出现的处理单一键值（key）的命令。那些使用多个键值的复杂操作， 比如 set 里的并集（unions）和交集（intersections）操作，就没有实现。通常来说，那些处理命令的节点获取不到键值的所有操作都不会被实现。 在将来，用户或许可以通过使用 MIGRATE COPY 命令，在集群上用 计算节点（Computation Nodes） 来执行多键值的只读操作， 但 Redis 集群本身不会执行复杂的多键值操作来把键值在节点间移来移去。 Redis 集群不像单机版本的 Redis 那样支持多个数据库，集群只有数据库 0，而且也不支持 SELECT 命令。

# 三、安装 #

**1、上传解压文件**

上传redis-5.0.8.tar.gz到/opt下  
\[root@dev1 opt\]\# tar -xvf redis-5.0.8.tar.gz  
\[root@dev1 opt\]\# cd redis-5.0.8/

**2、make，make install，make test**  
\[root@dev1 redis-5.0.8\]\# make  
\[root@dev1 redis-5.0.8\]\# make PREFIX=/opt/redis5-cluster install

\[root@dev1 redis-5.0.8\]\# make  
\-bash: /usr/bin/make: 没有那个文件或目录  
\[root@dev1 redis-5.0.8\]\# yum intall make \#安装make  
\[root@dev1 redis-5.0.8\]\# make  
……  
make\[3\]：gcc：命令未找到  
……  
\[root@dev1 redis-5.0.8\]\# yum install gcc \#安装gcc

重新解压代码make  
\[root@dev1 redis-5.0.8\]\# make

\[root@dev1 redis-5.0.8\]\# make **PREFIX=/opt/redis5-cluster install** \#指定安装目录PREFIX

\[root@dev1 redis-5.0.8\]\# make test  
cd src && make test  
make\[1\]: 进入目录“/opt/redis-5.0.8/src”  
    CC Makefile.dep  
You need tcl 8.5 or newer in order to run the Redis test

\[root@dev1 redis-5.0.8\]\# yum install tcl \#安装tcl \#没必要为了测试安装tcl

\[root@dev1 redis-5.0.8\]\# make test  
ERROR:  
\*\*\* \[err\]: Cant' start the Redis server  
ERROR:  
\*\*\* \[err\]: WAIT should not acknowledge 1 additional copy if slave is blocked in tests/unit/wait.tcl  
Expected condition '\[$master wait 1 3000\] == 0' to be true (\[::redis::redisHandle9 wait 1 3000\] == 0)  
\*\*\* \[err\]: pending querybuf: check size of pending\_querybuf after set a big value in tests/unit/pendingquerybuf.tcl  
the used\_memory of replica is much larger than master. Master:43869464 Replica:60643200  
Cleanup: may take some time... OK  
make\[1\]: \*\*\* \[Makefile:271：test\] 错误 1  
make\[1\]: 离开目录“/opt/redis-5.0.8/src”  
make: \*\*\* \[Makefile:6：test\] 错误 2

\[root@dev1 redis-5.0.8\]\# ps -ef|grep redis  
\[root@dev1 redis-5.0.8\]\# kill -9 进程号

\[root@dev1 redis-5.0.8\]\# make test  
\\o/ All tests passed without errors!

Cleanup: may take some time... OK  
make\[1\]: 离开目录“/opt/redis-5.0.8/src”

# **四、配置单节点** #

\[root@dev1 redis-5.0.8\]\# cd /opt/redis5-cluster/  
\[root@dev1 redis5-cluster\]\# ll  
总用量 0  
drwxr-xr-x. 2 root root 150 3月  26 04:11 bin  
\[root@dev1 redis5-cluster\]\# cd bin  
\[root@dev1 bin\]\# ll  
总用量 42532  
\-rwxr-xr-x. 1 root root  5945112 3月  26 04:06 redis-benchmark  
\-rwxr-xr-x. 1 root root 10378640 3月  26 04:06 redis-check-aof  
\-rwxr-xr-x. 1 root root 10378640 3月  26 04:06 redis-check-rdb  
\-rwxr-xr-x. 1 root root  6466256 3月  26 04:06 redis-cli  
lrwxrwxrwx. 1 root root       12 3月  26 04:06 redis-sentinel -> redis-server  
\-rwxr-xr-x. 1 root root 10378640 3月  26 04:06 redis-server

**4.1创建redis实例目录**

\[root@dev1 redis5-cluster\]\# cd ..  
\[root@dev1 redis5-cluster\]\# mkdir 7001 7002 7003 7004 7005 7006  
\[root@dev1 redis5-cluster\]\# ll  
总用量 0  
drwxr-xr-x. 2 root root   6 3月  26 14:13 7001  
drwxr-xr-x. 2 root root   6 3月  26 14:13 7002  
drwxr-xr-x. 2 root root   6 3月  26 14:13 7003  
drwxr-xr-x. 2 root root   6 3月  26 14:13 7004  
drwxr-xr-x. 2 root root   6 3月  26 14:13 7005  
drwxr-xr-x. 2 root root   6 3月  26 14:13 7006  
drwxr-xr-x. 2 root root 134 3月  26 13:22 bin

**4.2拷贝配置文件，编辑**

\[root@dev1 redis5-cluster\]\# cp /opt/redis-5.0.8/redis.conf /opt/redis5-cluster/7001/redis.conf  
\[root@dev1 redis5-cluster\]\# cd 7001  
\[root@dev1 7001\]\# ll  
总用量 64  
\-rw-r--r--. 1 root root 61797 3月  26 14:16 redis.conf

**编辑配置文件**

\#绑定IP

注意：bind的意思不是绑定外部服务器的IP，而是绑定本机可以接受访问的IP，

如127.0.0.1，或本机局域网IP。

不要只bind 127.0.0.1，否则连接集群跳转时有问题。

可以配多个bind 192.168.0.201 127.0.0.1 \#把本地局域网IP写前面，这样方便远程访问集群。写127.0.0.1是方便本地客户端连接。

但是个人建议不绑定IP，或配置成bind 0.0.0.0，绑定IP后，配置自动启动会遇到问题。

Could not create server TCP listening socket 192.168.0.201:7001: bind: Cannot assign requested address

\#bind 127.0.0.1

bind 0.0.0.0

\#关闭保护模式，允许其他服务器连接  
\#protected-mode yes  
protected-mode no

\#设置端口号  
\#port 6379  
port 7001

\#守护进程，在后台运行  
\#daemonize no  
daemonize yes

\#设置进程ID文件路径  
\#pidfile /var/run/redis\_6379.pid  
pidfile /opt/redis5-cluster/7001/redis.pid

\#设置rdb文件名（不用改）  
dbfilename dump.rdb  
设置rdb文件（及aof文件）路径  
\#dir ./  
dir /opt/redis5-cluster/7001 \#appendonly.aof文件共用此目录

\#设置日志文件路径  
\#logfile ""  
logfile /opt/redis5-cluster/7001/redis.log

\#设置连接密码  
\# requirepass foobared  
requirepass redis508

\#设置主密码（主从复制时使用）  
\# masterauth <master-password>  
masterauth redis508

\#设置最大内存 (先不设置)  
\# maxmemory <bytes>  
\#maxmemory 2gb

\#开启AOF持久化（做缓存，为了提高效率，这个可以不开）  
\#appendonly no  
appendonly yes

\#设置AOF文件名称（不用改）  
appendfilename "appendonly.aof"

\#启用集群模式  
cluster-enabled yes

\#集群配置文件（自动创建）  
\# cluster-config-file nodes-6379.conf  
cluster-config-file /opt/redis5-cluster/7001/nodes.conf

\#超时时间  
\# cluster-node-timeout 15000  
cluster-node-timeout 5000

**4.3启动redis服务**  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-server /opt/redis5-cluster/7001/redis.conf

\[root@dev1 7001\]\# ps -ef|grep redis  
root       2459      1  0 21:05 ?        00:00:00 /opt/redis5-cluster/bin/redis-server 0.0.0.0:7001 \[cluster\]  
root       2464   2212  0 21:05 pts/0    00:00:00 grep --color=auto redis

\[root@dev1 7001\]\# ll  
总用量 76  
\-rw-r--r--. 1 root root     0 3月  31 21:05 appendonly.aof  
\-rw-r--r--. 1 root root   114 3月  31 21:05 nodes.conf  
\-rw-r--r--. 1 root root 62111 3月  31 21:01 redis.conf  
\-rw-r--r--. 1 root root  2142 3月  31 21:05 redis.log  
\-rw-r--r--. 1 root root     5 3月  31 21:05 redis.pid  
这会rdb还没保存

**4.4查看日志**

可以打开另一个窗口查看日志  
\[root@dev1 7001\]\# tail -f redis.log

2202:C 31 Mar 2020 21:06:22.263 \# oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo  
2202:C 31 Mar 2020 21:06:22.263 \# Redis version=5.0.8, bits=64, commit=00000000, modified=0, pid=2202, just started  
2202:C 31 Mar 2020 21:06:22.263 \# Configuration loaded  
2203:M 31 Mar 2020 21:06:22.266 \* Increased maximum number of open files to 10032 (it was originally set to 1024).  
2203:M 31 Mar 2020 21:06:22.266 \* No cluster configuration found, I'm be91593109466a2f2fad9cf77be4f73282be16c8  
                \_.\_                                                    
           \_.-\`\`\_\_ ''-.\_                                               
      \_.-\`\`    \`.  \`\_.  ''-.\_           Redis 5.0.8 (00000000/0) 64 bit  
  .-\`\` .-\`\`\`.  \`\`\`\\/    \_.,\_ ''-.\_                                     
 (    '      ,       .-\`  | \`,    )     Running in cluster mode  
 |\`-.\_\`-...-\` \_\_...-.\`\`-.\_|'\` \_.-'|     Port: 7001  
 |    \`-.\_   \`.\_    /     \_.-'    |     PID: 2203  
  \`-.\_    \`-.\_  \`-./  \_.-'    \_.-'                                     
 |\`-.\_\`-.\_    \`-.\_\_.-'    \_.-'\_.-'|                                    
 |    \`-.\_\`-.\_        \_.-'\_.-'    |           http://redis.io          
  \`-.\_    \`-.\_\`-.\_\_.-'\_.-'    \_.-'                                     
 |\`-.\_\`-.\_    \`-.\_\_.-'    \_.-'\_.-'|                                    
 |    \`-.\_\`-.\_        \_.-'\_.-'    |                                    
  \`-.\_    \`-.\_\`-.\_\_.-'\_.-'    \_.-'                                     
      \`-.\_    \`-.\_\_.-'    \_.-'                                         
          \`-.\_        \_.-'                                             
              \`-.\_\_.-'

2203:M 31 Mar 2020 21:06:22.268 \# WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.  
2203:M 31 Mar 2020 21:06:22.268 \# Server initialized  
2203:M 31 Mar 2020 21:06:22.268 \# 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.  
2203:M 31 Mar 2020 21:06:22.268 \# 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.  
2203:M 31 Mar 2020 21:06:22.268 \* Ready to accept connections

**4.5解决3个警告**  
警告：无法强制执行TCP backlog设置511，因为/proc/sys/net/core/somaxconn被设置为较低的值128。  
redis优化/proc/sys/net/core/somaxconn  
[https://blog.csdn.net/haveqing/article/details/84835397][https_blog.csdn.net_haveqing_article_details_84835397]  
警告overcommit\_memory设置为0！在内存不足的情况下，后台保存可能会失败。若要解决此问题，请将“vm.overcommit\_memory=1”添加到/etc/sysctl.conf，然后重新启动或运行命令“sysctl vm.overcommit\_memory=1”以使其生效。  
警告您在内核中启用了透明大页（THP）支持。 这将在Redis中造成延迟和内存使用问题。 要解决此问题，请以root用户身份运行命令“echo never > /sys/kernel/mm/transparent\_hugepage/enabled”，并将其添加到您的/etc/rc.local中，以便在重启后保留设置。 禁用THP后，必须重新启动Redis。

CentOS7，CentOS8，需要编辑的是/etc/rc.d/rc.local,  
尤其要加一句：chmod +x /etc/rc.d/rc.local，加可执行权限，否则无效

重启redis后就没警告了

**4.6测试单节点**  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-cli -h 127.0.0.1 -p 7001 -a redis508  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.  
127.0.0.1:7001> ping  
PONG  
127.0.0.1:7001> set foo bar  
(error) CLUSTERDOWN Hash slot not served

这块报错，等建好集群就好了

**4.7停止redis**  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-cli -h 127.0.0.1 -p 7001 -a redis508 shutdown  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-cli -h 127.0.0.1 -p 7001  
127.0.0.1:7001> auth redis508  
OK  
127.0.0.1:7001> shutdown  
not connected> exit

**4.8配置6个节点，并启动**  
把7001下的redis.conf复制出5份，并修改相应端口号，

启动6个节点  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-server /opt/redis5-cluster/7001/redis.conf  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-server /opt/redis5-cluster/7002/redis.conf  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-server /opt/redis5-cluster/7003/redis.conf  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-server /opt/redis5-cluster/7004/redis.conf  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-server /opt/redis5-cluster/7005/redis.conf  
\[root@dev1 7001\]\# /opt/redis5-cluster/bin/redis-server /opt/redis5-cluster/7006/redis.conf

查看进程

\[root@dev1 redis5-cluster\]\# ps -ef|grep redis  
root       2574      1  0 21:20 ?        00:00:00 /opt/redis5-cluster/bin/redis-server 0.0.0.0:7001 \[cluster\]  
root       2579      1  0 21:20 ?        00:00:00 /opt/redis5-cluster/bin/redis-server 0.0.0.0:7002 \[cluster\]  
root       2581      1  0 21:20 ?        00:00:00 /opt/redis5-cluster/bin/redis-server 0.0.0.0:7003 \[cluster\]  
root       2587      1  0 21:20 ?        00:00:00 /opt/redis5-cluster/bin/redis-server 0.0.0.0:7004 \[cluster\]  
root       2591      1  0 21:20 ?        00:00:00 /opt/redis5-cluster/bin/redis-server 0.0.0.0:7005 \[cluster\]  
root       2596      1  0 21:20 ?        00:00:00 /opt/redis5-cluster/bin/redis-server 0.0.0.0:7006 \[cluster\]  
root       2604   2505  0 21:21 pts/0    00:00:00 grep --color=auto redis

如果不配bind，这显示的是\*:7001

# **五、创建集群** #

关键的就是这么一句

\# --cluster-replicas 1  表示主从配置比，1表示的是1:1，前三个是主，后三个是从  
\# 若配置文件中设置的密码，则还需要加上-a passwod

ip使用局域网IP，方便远程访问

\[root@dev1 redis5-cluster\]\# **/opt/redis5-cluster/bin/redis-cli --cluster create 192.168.0.201:7001 192.168.0.201:7002 192.168.0.201:7003 192.168.0.201:7004 192.168.0.201:7005 192.168.0.201:7006 --cluster-replicas 1 -a redis508**  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.  
>>> Performing hash slots allocation on 6 nodes...  
Master\[0\] -> Slots 0 - 5460  
Master\[1\] -> Slots 5461 - 10922  
Master\[2\] -> Slots 10923 - 16383  
Adding replica 192.168.0.201:7005 to 192.168.0.201:7001  
Adding replica 192.168.0.201:7006 to 192.168.0.201:7002  
Adding replica 192.168.0.201:7004 to 192.168.0.201:7003  
>>> Trying to optimize slaves allocation for anti-affinity  
\[WARNING\] Some slaves are in the same host as their master  
M: 3951adbbbc5c2f75d3f21d04374642160b16bd20 192.168.0.201:7001  
   slots:\[0-5460\] (5461 slots) master  
M: 030e950d546a9fd06141120e5b4609ed88985bb3 192.168.0.201:7002  
   slots:\[5461-10922\] (5462 slots) master  
M: 8cef9aa6a6802d0a9e013937df00580cc4c230cd 192.168.0.201:7003  
   slots:\[10923-16383\] (5461 slots) master  
S: b0fb3342ec36b1f7187bd510428db2b0ebbd1d77 192.168.0.201:7004  
   replicates 8cef9aa6a6802d0a9e013937df00580cc4c230cd  
S: 9cd965c4687fabafe6fad47e63e98de5c4b56f9f 192.168.0.201:7005  
   replicates 3951adbbbc5c2f75d3f21d04374642160b16bd20  
S: 59eff667a29a532c4c57aee74bbfaa86d0b5fa32 192.168.0.201:7006  
   replicates 030e950d546a9fd06141120e5b4609ed88985bb3  
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 192.168.0.201:7001)  
M: 3951adbbbc5c2f75d3f21d04374642160b16bd20 192.168.0.201:7001  
   slots:\[0-5460\] (5461 slots) master  
   1 additional replica(s)  
M: 8cef9aa6a6802d0a9e013937df00580cc4c230cd 192.168.0.201:7003  
   slots:\[10923-16383\] (5461 slots) master  
   1 additional replica(s)  
S: 59eff667a29a532c4c57aee74bbfaa86d0b5fa32 192.168.0.201:7006  
   slots: (0 slots) slave  
   replicates 030e950d546a9fd06141120e5b4609ed88985bb3  
S: b0fb3342ec36b1f7187bd510428db2b0ebbd1d77 192.168.0.201:7004  
   slots: (0 slots) slave  
   replicates 8cef9aa6a6802d0a9e013937df00580cc4c230cd  
S: 9cd965c4687fabafe6fad47e63e98de5c4b56f9f 192.168.0.201:7005  
   slots: (0 slots) slave  
   replicates 3951adbbbc5c2f75d3f21d04374642160b16bd20  
M: 030e950d546a9fd06141120e5b4609ed88985bb3 192.168.0.201:7002  
   slots:\[5461-10922\] (5462 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.

**5.1测试**

**普通连接到单节点可能会报错**

\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -h 127.0.0.1 -p 7001 -a redis508  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.  
127.0.0.1:7001> ping  
PONG  
127.0.0.1:7001> set foo bar  
(error) MOVED 12182 192.168.0.201:7003  
127.0.0.1:7001>

**使用-c连接集群节点**

\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7001 -a redis508  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.  
127.0.0.1:7001> ping  
PONG  
127.0.0.1:7001> set foo bar  
\-> Redirected to slot \[12182\] located at 192.168.0.201:7003  
OK  
192.168.0.201:7003> get foo  
"bar"  
192.168.0.201:7003> del foo  
(integer) 1

**5.2查看集群节点**

\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7001 -a redis508 cluster nodes  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.  
8cef9aa6a6802d0a9e013937df00580cc4c230cd 192.168.0.201:7003@17003 master - 0 1585661242778 3 connected 10923-16383  
3951adbbbc5c2f75d3f21d04374642160b16bd20 192.168.0.201:7001@17001 myself,master - 0 1585661243000 1 connected 0-5460  
59eff667a29a532c4c57aee74bbfaa86d0b5fa32 192.168.0.201:7006@17006 slave 030e950d546a9fd06141120e5b4609ed88985bb3 0 1585661243581 6 connected  
b0fb3342ec36b1f7187bd510428db2b0ebbd1d77 192.168.0.201:7004@17004 slave 8cef9aa6a6802d0a9e013937df00580cc4c230cd 0 1585661243781 4 connected  
9cd965c4687fabafe6fad47e63e98de5c4b56f9f 192.168.0.201:7005@17005 slave 3951adbbbc5c2f75d3f21d04374642160b16bd20 0 1585661242000 5 connected  
030e950d546a9fd06141120e5b4609ed88985bb3 192.168.0.201:7002@17002 master - 0 1585661243000 2 connected 5461-10922

可用连接后再输入命令cluster nodes

**5.3查看集群状态**

\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7001 -a redis508 cluster info  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.  
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:475  
cluster\_stats\_messages\_pong\_sent:481  
cluster\_stats\_messages\_sent:956  
cluster\_stats\_messages\_ping\_received:476  
cluster\_stats\_messages\_pong\_received:475  
cluster\_stats\_messages\_meet\_received:5  
cluster\_stats\_messages\_received:956

可用连接后再输入命令cluster info

**5.3停止redis集群**

这个可以写到脚本里，（-c可以不写）  
\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7001 -a redis508 shutdown  
\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7002 -a redis508 shutdown  
\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7003 -a redis508 shutdown  
\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7004 -a redis508 shutdown  
\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7005 -a redis508 shutdown  
\[root@dev1 redis5-cluster\]\# /opt/redis5-cluster/bin/redis-cli -c -h 127.0.0.1 -p 7006 -a redis508 shutdown

**5.4cluster帮助**

127.0.0.1:7001> **cluster help**  
 1) CLUSTER <subcommand> arg arg ... arg. Subcommands are:  
 2) ADDSLOTS <slot> \[slot ...\] -- Assign slots to current node.  
 3) BUMPEPOCH -- Advance the cluster config epoch.  
 4) COUNT-failure-reports <node-id> -- Return number of failure reports for <node-id>.  
 5) COUNTKEYSINSLOT <slot> - Return the number of keys in <slot>.  
 6) DELSLOTS <slot> \[slot ...\] -- Delete slots information from current node.  
 7) FAILOVER \[force|takeover\] -- Promote current replica node to being a master.  
 8) FORGET <node-id> -- Remove a node from the cluster.  
 9) GETKEYSINSLOT <slot> <count> -- Return key names stored by current node in a slot.  
10) FLUSHSLOTS -- Delete current node own slots information.  
11) INFO \- Return onformation about the cluster.（这个information写错了？？）  
12) KEYSLOT <key> -- Return the hash slot for <key>.  
13) MEET <ip> <port> \[bus-port\] -- Connect nodes into a working cluster.  
14) MYID -- Return the node id.  
15) NODES \-- Return cluster configuration seen by node. Output format:  
16)     <id> <ip:port> <flags> <master> <pings> <pongs> <epoch> <link> <slot> ... <slot>  
17) REPLICATE <node-id> -- Configure current node as replica to <node-id>.  
18) RESET \[hard|soft\] -- Reset current node (default: soft).  
19) SET-config-epoch <epoch> - Set config epoch of current node.  
20) SETSLOT <slot> (importing|migrating|stable|node <node-id>) -- Set slot state.  
21) REPLICAS <node-id> -- Return <node-id> replicas.  
22) SLOTS -- Return information about slots range mappings. Each range is made of:  
23)     start, end, master and replicas IP addresses, ports and ids

**5.5目录结构**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hhdmVxaW5n_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hhdmVxaW5n_size_16_color_FFFFFF_t_70 1][]

# 六、配置自启动 #

[https://blog.csdn.net/haveqing/article/details/105233798][https_blog.csdn.net_haveqing_article_details_105233798]

# **七、重建集群** #

重建集群，先停止服务。把各个节点下的appendonly.aof，dump.rdb，nodes.conf删除后重建集群即可。

redis.log也可以删除

# **八、其他** #

/opt/redis-5.0.8/utils/create-cluster/create-cluster，可以借助这个脚本创建集群，停止集群等其他操作，

这个可以创建测试集群，比较简单，没必要深究。

Redis5快速创建集群  
https://www.jianshu.com/p/87ff94358074

**参考：**

一文看懂 Redis5 搭建集群  
[https://my.oschina.net/ruoli/blog/2252393][https_my.oschina.net_ruoli_blog_2252393]  
Redis5版本集群搭建  
[https://www.cnblogs.com/sanduzxcvbnm/p/11300942.html][https_www.cnblogs.com_sanduzxcvbnm_p_11300942.html]

Redis 集群教程  
[http://www.redis.cn/topics/cluster-tutorial.html][http_www.redis.cn_topics_cluster-tutorial.html]  
Redis 集群规范  
[http://www.redis.cn/topics/cluster-spec.html][http_www.redis.cn_topics_cluster-spec.html]

[https_redis.io_download]: https://redis.io/download
[http_download.redis.io_releases]: http://download.redis.io/releases/
[https_blog.csdn.net_haveqing_article_details_84835397]: https://blog.csdn.net/haveqing/article/details/84835397
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hhdmVxaW5n_size_16_color_FFFFFF_t_70]: /images/20230528/256170295aa44907b600f458d62249b6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hhdmVxaW5n_size_16_color_FFFFFF_t_70 1]: /images/20230528/a295c98d20104d80b56c7aa53274a9d0.png
[https_blog.csdn.net_haveqing_article_details_105233798]: https://blog.csdn.net/haveqing/article/details/105233798
[https_my.oschina.net_ruoli_blog_2252393]: https://my.oschina.net/ruoli/blog/2252393
[https_www.cnblogs.com_sanduzxcvbnm_p_11300942.html]: https://www.cnblogs.com/sanduzxcvbnm/p/11300942.html
[http_www.redis.cn_topics_cluster-tutorial.html]: http://www.redis.cn/topics/cluster-tutorial.html
[http_www.redis.cn_topics_cluster-spec.html]: http://www.redis.cn/topics/cluster-spec.html