Redis cluster deployment based on redis6.2.4

Experimental framework

1. Modify profile enable cluster function

1. Modify hostname 
hostnamectl set-hostname node1.magedu.org;exit
hostnamectl set-hostname node2.magedu.org;exit
hostnamectl set-hostname node3.magedu.org;exit
hostnamectl set-hostname node4.magedu.org;exit
hostnamectl set-hostname node5.magedu.org;exit
hostnamectl set-hostname node6.magedu.org;exit

2. install redis6.2.4
 Script to achieve one click installation ： See https://blog.csdn.net/aa896517050/article/details/125955201

3. Modify the configuration file （ All nodes ）
sed -i.bak  -e '/masterauth/a masterauth 123456' -e '/# cluster-enabled yes/a cluster-enabled yes' -e '/# cluster-config-file nodes-6379.conf/a cluster-config-file nodes-6379.conf' -e '/# cluster-require-full-coverage yes/c cluster-require-full-coverage no' /apps/redis/etc/redis.conf

4. Restart the service （ All nodes ）
systemctl enable --now redis
[[email protected]:~]#
ps aux|grep redis
redis      5578  0.1  0.1 162500  2944 ?        Ssl  Jul24   0:06 /apps/redis/bin/redis-server 0.0.0.0:6379
root       5866  0.0  0.0 112808   968 pts/0    S+   00:24   0:00 grep --color=auto redis

# Restart again 
systemctl restart redis
[[email protected]:~]#
ps aux|grep redis
redis      6013  0.1  0.1 162500  3520 ?        Ssl  00:57   0:00 /apps/redis/bin/redis-server 0.0.0.0:6379 [cluster]  #cluster sign 
root       6021  0.0  0.0 112808   968 pts/0    S+   00:58   0:00 grep --color=auto redis

[[email protected]:~]#
redis-cli -a 123456
127.0.0.1:6379> info cluster
# Cluster
cluster_enabled:1

2. All nodes interact with each other meet

1. Check the connection 
[[email protected]:~]#
redis-cli -a 123456 cluster nodes
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
fdec26daee7636c212283fd8b32c8088e54a6655 :[email protected] myself,master - 0 0 0 connected
# There is no connection with any one at this time ,6 Each node is independent .

2. On any node and all other nodes meet signal communication （ This time at node1 operation ,node1 It's the middleman , All connected ）
[[email protected]:~]#
redis-cli  -a 123456 --no-auth-warning cluster meet 10.0.0.17 6379
[[email protected]:~]#
ss -nt
State       Recv-Q Send-Q       Local Address:Port        Peer Address:Port              
ESTAB       0      0               10.0.0.7:36605             10.0.0.17:16379              
ESTAB       0      36              10.0.0.7:22                10.0.0.1:51254              
ESTAB       0      0               10.0.0.7:16379             10.0.0.17:44342  
# The cluster port is 16379、

[[email protected]:~]#
redis-cli  -a 123456 --no-auth-warning cluster meet 10.0.0.27 6379
OK
[[email protected]:~]#
redis-cli  -a 123456 --no-auth-warning cluster meet 10.0.0.37 6379
OK
[[email protected]:~]#
redis-cli  -a 123456 --no-auth-warning cluster meet 10.0.0.47 6379
OK
[[email protected]:~]#
redis-cli  -a 123456 --no-auth-warning cluster meet 10.0.0.57 6379
OK
 
# Check the connection 
[[email protected]:~]#
redis-cli -a 123456 cluster info
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
cluster_state:fail
cluster_slots_assigned:0
cluster_slots_ok:0
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6  # Express 6 Connections have been established between nodes 
cluster_size:0
cluster_current_epoch:5
cluster_my_epoch:0
cluster_stats_messages_ping_sent:468
cluster_stats_messages_pong_sent:475
cluster_stats_messages_meet_sent:6
cluster_stats_messages_sent:949
cluster_stats_messages_ping_received:475
cluster_stats_messages_pong_received:474
cluster_stats_messages_received:949

[[email protected]:~]#
redis-cli -a 123456 cluster nodes
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
4e456d304f1971c3fe776c21d8dd2c880dd29fd2 10.0.0.27:[email protected] master - 0 1658683099799 2 connected
008abaa9cf3b273f905a26838f675c1be17b8570 10.0.0.37:[email protected] master - 0 1658683097000 3 connected
c30419b368a783f4c4d9de948dcc7f3d44ee4797 10.0.0.17:[email protected] master - 0 1658683098000 1 connected
f941e86ede0fad0dfe70b5ee6ad0577e21cb0d98 10.0.0.47:[email protected] master - 0 1658683099000 4 connected
46b3deba6bdaf57e481cce86f4335963d555dcdc 10.0.0.57:[email protected] master - 0 1658683096000 5 connected
fdec26daee7636c212283fd8b32c8088e54a6655 10.0.0.7:[email protected] myself,master - 0 1658683098000 0 connected

3. Assign slots （ Script implementation ）

[[email protected]:~]#
vim addslot.sh

#!/bin/bash
#****************************************************
#Date: 2022-07-25
#Author: wwzroom
#FileName: addslot.sh
#Description: The test script
#QQ: 896517050
#sh****************************************************
host=$1
port=$2
start=$3
end=$4
pass=123456                                                                                                                           
for slot in `seq ${
     start} ${
     end}`;do
    echo slot:$slot
    redis-cli -h ${host} -p $port -a ${pass} --no-auth-warning cluster addslots ${slot}
done

2. Add execute permission 
[[email protected]:~]#
chmod +x addslot.sh

3. Assign slots 
[[email protected]:~]#
./addslot.sh 10.0.0.7 6379 0 5461
[[email protected]:~]#
./addslot.sh 10.0.0.17 6379 5462 10922
[[email protected]:~]#
./addslot.sh 10.0.0.27 6379 10923 16383
# When allocating, if the first node is allocated incorrectly , When the second node is reallocated , It can't be allocated , It doesn't affect the experiment , If the first score is too much , There is no way to divide the back , Therefore, the recorded file can be deleted ,rm -rf /apps/redis/data/nodes-6379.conf, again meet, Redistribution .

# View allocation 
[[email protected]:~]#
redis-cli -a 123456 
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> cluster nodes
4e456d304f1971c3fe776c21d8dd2c880dd29fd2 10.0.0.27:[email protected] master - 0 1658684953613 2 connected 10923-16383
008abaa9cf3b273f905a26838f675c1be17b8570 10.0.0.37:[email protected] master - 0 1658684952000 3 connected
c30419b368a783f4c4d9de948dcc7f3d44ee4797 10.0.0.17:[email protected] master - 0 1658684953000 1 connected 5462-10922
f941e86ede0fad0dfe70b5ee6ad0577e21cb0d98 10.0.0.47:[email protected] master - 0 1658684953000 4 connected
46b3deba6bdaf57e481cce86f4335963d555dcdc 10.0.0.57:[email protected] master - 0 1658684952609 5 connected
fdec26daee7636c212283fd8b32c8088e54a6655 10.0.0.7:[email protected] myself,master - 0 1658684951000 0 connected 0-5461

4. Specify the master-slave relationship of each node

[[email protected]:~]#
redis-cli -h 10.0.0.37 -a 123456 --no-auth-warning cluster replicate fdec26daee7636c212283fd8b32c8088e54a6655 # The master node id, Set up here 37 by 07 The slave node ,id Number is 07 Of ,ID No. has the above nodes Information acquisition .

[[email protected]:~]#
redis-cli -h 10.0.0.47 -a 123456 --no-auth-warning cluster replicate c30419b368a783f4c4d9de948dcc7f3d44ee4797
[[email protected]:~]#
redis-cli -h 10.0.0.57 -a 123456 --no-auth-warning cluster replicate 4e456d304f1971c3fe776c21d8dd2c880dd29fd2

# Check the details 
[[email protected]:~]#
redis-cli -a 123456 cluster nodes
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
4e456d304f1971c3fe776c21d8dd2c880dd29fd2 10.0.0.27:[email protected] master - 0 1658686186000 2 connected 10923-16383
008abaa9cf3b273f905a26838f675c1be17b8570 10.0.0.37:[email protected] slave fdec26daee7636c212283fd8b32c8088e54a6655 0 1658686187701 0 connected
c30419b368a783f4c4d9de948dcc7f3d44ee4797 10.0.0.17:[email protected] master - 0 1658686186693 1 connected 5462-10922
f941e86ede0fad0dfe70b5ee6ad0577e21cb0d98 10.0.0.47:[email protected] slave c30419b368a783f4c4d9de948dcc7f3d44ee4797 0 1658686185684 1 connected
46b3deba6bdaf57e481cce86f4335963d555dcdc 10.0.0.57:[email protected] slave 4e456d304f1971c3fe776c21d8dd2c880dd29fd2 0 1658686185000 2 connected
fdec26daee7636c212283fd8b32c8088e54a6655 10.0.0.7:[email protected] myself,master - 0 1658686185000 0 connected 0-5461

[[email protected]:~]#
redis-cli -a 123456 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             #3 Group cluster 
cluster_current_epoch:5
cluster_my_epoch:0
cluster_stats_messages_ping_sent:3721
cluster_stats_messages_pong_sent:3753
cluster_stats_messages_meet_sent:6
cluster_stats_messages_sent:7480
cluster_stats_messages_ping_received:3753
cluster_stats_messages_pong_received:3727
cluster_stats_messages_received:7480

[[email protected]:~]#
redis-cli  -a 123456 --no-auth-warning cluster slots
1) 1) (integer) 0
   2) (integer) 5461
   3) 1) "10.0.0.7"
      2) (integer) 6379
      3) "fdec26daee7636c212283fd8b32c8088e54a6655"
   4) 1) "10.0.0.37"
      2) (integer) 6379
      3) "008abaa9cf3b273f905a26838f675c1be17b8570"
2) 1) (integer) 5462
   2) (integer) 10922
   3) 1) "10.0.0.17"
      2) (integer) 6379
      3) "c30419b368a783f4c4d9de948dcc7f3d44ee4797"
   4) 1) "10.0.0.47"
      2) (integer) 6379
      3) "f941e86ede0fad0dfe70b5ee6ad0577e21cb0d98"
3) 1) (integer) 10923
   2) (integer) 16383
   3) 1) "10.0.0.27"
      2) (integer) 6379
      3) "4e456d304f1971c3fe776c21d8dd2c880dd29fd2"
   4) 1) "10.0.0.57"
      2) (integer) 6379
      3) "46b3deba6bdaf57e481cce86f4335963d555dcdc"

5. Write data test

1. Connect any master node to write data , about key Value for hash operation （ And value irrelevant ）, Then re allocate according to the card slot relationship , If not assigned to this node , You will be prompted to report an error (error) MOVED 7755 10.0.0.17:6379, Prompt to put in the specific slot .
[[email protected]:~]#
redis-cli -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> set class m44
(error) MOVED 7755 10.0.0.17:6379
127.0.0.1:6379> 

2 Log in to the specified slot to write data , Can succeed , You cannot check the data at the slave node , Not enabled 
[[email protected]:~]#
redis-cli -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> set class m44
OK

# Data cannot be queried from the node , That is, read and write can only be provided by the master node , The slave node cannot provide services .
127.0.0.1:6379> keys class
1) "class"
127.0.0.1:6379> get class
(error) MOVED 7755 10.0.0.17:6379

3. Specify the options -c Indicates accessing in a cluster , There is no limit on the , Master or slave login can be used .
[[email protected]:~]#
redis-cli -c -a 123456 --no-auth-warning set name wang
OK
[[email protected]:~]#
redis-cli -c -a 123456 --no-auth-warning get name 
"wang"

# Prompt to redirect to a specific node .
[[email protected]:~]#
redis-cli -a 123456 -c  # Log in as a cluster 
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> set age 20
-> Redirected to slot [741] located at 10.0.0.7:6379
OK
10.0.0.7:6379> get age
"20"
10.0.0.7:6379> set class M47
-> Redirected to slot [7755] located at 10.0.0.17:6379
OK
10.0.0.17:6379> get class
"M47"