1. Version information
CentOS：release 6.5 (Final)
GCC：4.4.7
Redis：5.0.9
2. Cluster construction
2.1 Cluster Planning
Master: 11.11.11.160:6379, 11.11.11.161:6379,
11.11.11.162:6379 Slave: 11.11.11.163:6379, 11.11.11.164:6379, 11.11.11.165:6379
- If it is a cloud server, external network access is required, and the above IPs are all external network IPs
- Open the firewall ports of all servers, 6379 and 16379
2.2 Cluster installation
First create the /data/redis-cluster folder, download the Redis compressed file to this folder, and then compile and install:
mkdir /data/redis-cluster
cd /data/redis-cluster
wget http://download.redis.io/releases/redis-5.0.9.tar.gz
tar -zxvf redis-5.0.9.tar.gz
cd redis-5.0.9
make
Create folders based on ports
mkdir /data/redis-cluster/redis-5.0.9/conf
mkdir /data/redis-cluster/redis-5.0.9/6379
mkdir /data/redis-cluster/redis-5.0.9/6380
mkdir /data/redis-cluster/redis-5.0.9/6381
mkdir /data/redis-cluster/redis-5.0.9/6382
mkdir /data/redis-cluster/redis-5.0.9/6383
mkdir /data/redis-cluster/redis-5.0.9/6384
Copy the configuration file redis.conf to the /data/redis-cluster/redis-5.0.9/conf directory and rename it to redis-6379.conf, redis-6380.conf, redis-6381.conf, redis-6382.conf , redis-6383.conf, redis-6384.conf
redis-6379.conf modify the following parts:
port 6379
#bind 127.0.0.1
cluster-enabled yes
cluster-config-file /data/redis-cluster/redis-5.0.9/6379/nodes.conf
appendfilename "appendonly.aof"
protected-mode no
daemonize yes
appendonly yes
requirepass qaz@123
masterauth qaz@123
logfile "/data/redis-cluster/redis-5.0.9/6379/redis.log"
pidfile /data/redis-cluster/redis-5.0.9/6379/redis.pid
dbfilename dump.rdb
dir /data/redis-cluster/redis-5.0.9/6379
Configuration instructions
port：修改 Redis 端口
#bind 127.0.0.1：注释掉后外网就可以连接 Redis 了
cluster-enabled：设置为 yes 表示开启集群
cluster-config-file： 表示集群节点的配置文件
protected-mode：由于配置了密码登录，这里将 protected-mode 设置为 no 关闭保护模式。
daemonize：设置为 yes 表示允许 Redis 在后台启动。
requirepass：表示登录该 Redis 实例所需的密码
masterauth：由于每个节点都开启了密码认证，因此又增加 masterauth 配置，使得从机可以登录到主机上。
appendonly：开启aof文件
For other configuration items, explain in more detail: Redis configuration file detailed
explanation The configuration files of other ports should also be modified accordingly
Execute the following command on each server to start the Redis instance respectively:
/data/redis-cluster/redis-5.0.9/src/redis-server /data/redis-cluster/redis-5.0.9/conf/redis-6379.conf
Create a redis cluster with redis-cli
/data/redis-cluster/redis-5.0.9/src/redis-cli -a qaz@123 --cluster create 11.11.11.160:6379 11.11.11.161:6379 11.11.11.162:6379 11.11.11.163:6379 11.11.11.164:6379 11.11.11.165:6379 --cluster-replicas 1
Create log:
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 11.11.11.164:6379 to 11.11.11.160:6379
Adding replica 11.11.11.165:6379 to 11.11.11.161:6379
Adding replica 11.11.11.163:6379 to 11.11.11.162:6379
M: f6bade412603174b67db6b1a470fd673f9a5c314 11.11.11.160:6379
slots:[0-5460] (5461 slots) master
M: 64026cdbf85335a43d16ccfb9f5e0e335faa2722 11.11.11.161:6379
slots:[5461-10922] (5462 slots) master
M: 98ca7df6298a84c58f73412f95a398a050ca302e 11.11.11.162:6379
slots:[10923-16383] (5461 slots) master
S: a3990e0418aa242bb0e39d2d31a1ec8c796de5f3 11.11.11.163:6379
replicates 98ca7df6298a84c58f73412f95a398a050ca302e
S: c5dcbc92b1e939113d5594f4895340cdec6bf2c1 11.11.11.164:6379
replicates f6bade412603174b67db6b1a470fd673f9a5c314
S: 5d252fb7a82c3e2b28aa7f573f1516444584e97c 11.11.11.165:6379
replicates 64026cdbf85335a43d16ccfb9f5e0e335faa2722
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 11.11.11.160:6379)
M: f6bade412603174b67db6b1a470fd673f9a5c314 11.11.11.160:6379
slots:[0-5460] (5461 slots) master
1 additional replica(s)
M: 98ca7df6298a84c58f73412f95a398a050ca302e 11.11.11.162:6379
slots:[10923-16383] (5461 slots) master
1 additional replica(s)
S: c5dcbc92b1e939113d5594f4895340cdec6bf2c1 11.11.11.164:6379
slots: (0 slots) slave
replicates f6bade412603174b67db6b1a470fd673f9a5c314
M: 64026cdbf85335a43d16ccfb9f5e0e335faa2722 11.11.11.161:6379
slots:[5461-10922] (5462 slots) master
1 additional replica(s)
S: 5d252fb7a82c3e2b28aa7f573f1516444584e97c 11.11.11.165:6379
slots: (0 slots) slave
replicates 64026cdbf85335a43d16ccfb9f5e0e335faa2722
S: a3990e0418aa242bb0e39d2d31a1ec8c796de5f3 11.11.11.163:6379
slots: (0 slots) slave
replicates 98ca7df6298a84c58f73412f95a398a050ca302e
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
2.3 Cluster verification
2.3.1 Setting environment variables
vim /etc/profile
#添加
export REDIS_HOME=/data/redis-cluster/redis-5.0.9/src
export PATH=${JAVA_HOME}/bin:$PATH:$REDIS_HOME
source /etc/profile
2.3.2 Connect client
redis-cli -c -a qaz@123 -h 11.11.11.160 -p 6379
Tip: -a access server password, -c means cluster mode, specify ip address and port number
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
11.11.11.160:6379>
11.11.11.160:6379>
11.11.11.160:6379> keys *
(empty list or set)
11.11.11.160:6379> set name my name is lihy
-> Redirected to slot [5798] located at 11.11.11.161:6379
(error) ERR syntax error
11.11.11.161:6379> keys *
(empty list or set)
11.11.11.161:6379> set name 'my name is lihy'
OK
11.11.11.161:6379> keys *
1) "name"
11.11.11.161:6379> get name
"my name is lihy"
2.3.3 View cluster information
11.11.11.161:6379>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:2
cluster_stats_messages_ping_sent:1545
cluster_stats_messages_pong_sent:1615
cluster_stats_messages_meet_sent:2
cluster_stats_messages_sent:3162
cluster_stats_messages_ping_received:1612
cluster_stats_messages_pong_received:1547
cluster_stats_messages_meet_received:3
cluster_stats_messages_received:3162
2.3.4 View node list
11.11.11.161:6379> cluster nodes
98ca7df6298a84c58f73412f95a398a050ca302e 11.11.11.162:6379@16379 master - 0 1600765329213 3 connected 10923-16383
a3990e0418aa242bb0e39d2d31a1ec8c796de5f3 11.11.11.163:6379@16379 slave 98ca7df6298a84c58f73412f95a398a050ca302e 0 1600765330215 3 connected
64026cdbf85335a43d16ccfb9f5e0e335faa2722 11.11.11.161:6379@16379 myself,master - 0 1600765331000 2 connected 5461-10922
f6bade412603174b67db6b1a470fd673f9a5c314 11.11.11.160:6379@16379 master - 0 1600765331217 1 connected 0-5460
5d252fb7a82c3e2b28aa7f573f1516444584e97c 11.11.11.165:6379@16379 slave 64026cdbf85335a43d16ccfb9f5e0e335faa2722 0 1600765331000 6 connected
c5dcbc92b1e939113d5594f4895340cdec6bf2c1 11.11.11.164:6379@16379 slave f6bade412603174b67db6b1a470fd673f9a5c314 0 1600765332221 1 connected
2.3.5 Shutting down the cluster
To shut down the cluster, you need to shut down one by one, use the command:
redis-cli -a qaz@123 -c -h 11.11.11.160 -p 6379 shutdown
2.3.6 Manually manage redis cluster
3、将 ip 和 port 所指定的节点添加到集群中
CLUSTER MEET <ip> <port>
4、从集群中移除 node_id 指定的节点
CLUSTER FORGET <node_id>
5、将当前节点设置为 node_id 指定的节点的从节点
CLUSTER REPLICATE <node_id>
6、将节点的配置文件保存到硬盘里面
CLUSTER SAVECONFIG
7、将一个或多个槽（slot）指派（assign）给当前节点
CLUSTER ADDSLOTS <slot> [slot ...]
8、移除一个或多个槽对当前节点的指派
CLUSTER DELSLOTS <slot> [slot ...]
9、 移除指派给当前节点的所有槽，让当前节点变成一个没有指派任何槽的节点
CLUSTER FLUSHSLOTS
10、将槽 slot 指派给 node_id 指定的节点，如果槽已经指派给另一个节点，那么先让另一个节点删除该槽>，然后再进行指派
CLUSTER SETSLOT <slot> NODE <node_id>
11、将本节点的槽 slot 迁移到 node_id 指定的节点中
CLUSTER SETSLOT <slot> MIGRATING <node_id>
12、从 node_id 指定的节点中导入槽 slot 到本节点
CLUSTER SETSLOT <slot> IMPORTING <node_id>
13、取消对槽 slot 的导入（import）或者迁移（migrate）
CLUSTER SETSLOT <slot> STABLE
14、计算键 key 应该被放置在哪个槽上
CLUSTER KEYSLOT <key>
15、返回槽 slot 目前包含的键值对数量
CLUSTER COUNTKEYSINSLOT <slot>
16、返回 count 个 slot 槽中的键
CLUSTER GETKEYSINSLOT <slot> <count>