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redis 集群搭建

目录

redis集群搭建

  1. 安装redis

    sudo apt-get isntall redis-server

  2. redis启动多个实例

    # 1. redis 的配置文件
/etc/redis/redis.conf

# 2. redis 拷贝一份
cp /etc/redis/redis.conf ~/redis_conf/.

  3. 修改为多分的配置文件

    $ ll
total 360K
-rwxrwxrwx 1 root       root       58K Dec  7 12:20 redis_7000.conf
-rwxrwxr-x 1 harleyzhao harleyzhao 58K Dec  7 12:23 redis_7001.conf
-rwxrwxr-x 1 harleyzhao harleyzhao 58K Dec  7 12:23 redis_7002.conf
-rwxrwxr-x 1 harleyzhao harleyzhao 58K Dec  7 12:23 redis_7003.conf
-rwxrwxr-x 1 harleyzhao harleyzhao 58K Dec  7 12:24 redis_7004.conf
-rwxrwxr-x 1 harleyzhao harleyzhao 58K Dec  7 12:24 redis_7005.conf

  4. 修改配置文件

    port 7000
#deamonize yes  #后台启动
cluster-enabled yes
cluster-config-file nodes_7000.conf
cluster-node-timeout 5000
appendonly yes

    提供一个实例配置文件：

    (redis_7000.conf)[../example_code/redis_conf/redis_7000.conf]

  5. 启动单个redis实例

    sudo redis-server redis_7001.conf
...
sudo redis-server redis_7005.conf

$ ps -ef | grep redis
root       502     1  0 14:28 ?        00:00:00 redis-server 127.0.0.1:7000 [
root       519     1  0 14:28 ?        00:00:00 redis-server 127.0.0.1:7001 [
root       536     1  0 14:28 ?        00:00:00 redis-server 127.0.0.1:7002 [
root       553     1  0 14:28 ?        00:00:00 redis-server 127.0.0.1:7003 [
root       570     1  0 14:28 ?        00:00:00 redis-server 127.0.0.1:7004 [
root       587     1  0 14:28 ?        00:00:00 redis-server 127.0.0.1:7005 [

  6. 查看redis-cli

    $ redis-cli -c -p 7000
127.0.0.1:7000> cluster info
cluster_state:fail
cluster_slots_assigned:0
cluster_slots_ok:0
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:1
cluster_size:0
cluster_current_epoch:0
cluster_my_epoch:0
cluster_stats_messages_sent:0
cluster_stats_messages_received:0
127.0.0.1:7000> exit

  7. redis-trib

    sudo apt-get install ruby-full

mkdir ~/down && cd ~/down
wget http://rubygems.org/downloads/redis-3.3.0.gem
gem install -l redis-3.3.0.gem

# 找到redis-trib
sudo find / -name redis-trib.rb

# redis-trib 管理集群
$ redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7004 to 127.0.0.1:7000
Adding replica 127.0.0.1:7005 to 127.0.0.1:7001
Adding replica 127.0.0.1:7003 to 127.0.0.1:7002
>>> Trying to optimize slaves allocation for anti-affinity
[WARNING] Some slaves are in the same host as their master
M: d81022ee4427a03e464008c7502e4af521abe845 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: 5c7af37df15107e0fa4f66bd14639e3885c6548d 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: 7a5735b92963a2942ae94d98974816a62219cd15 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
S: 041724d3c83350f8937c754ee9e1bfe9072e39ad 127.0.0.1:7003
replicates d81022ee4427a03e464008c7502e4af521abe845
S: 2d0f535e8ea4364c84bf3ae150cb563a784620a2 127.0.0.1:7004
replicates 5c7af37df15107e0fa4f66bd14639e3885c6548d
S: 69ca8f5a32e8288f71116b8d06787fa77d6daecf 127.0.0.1:7005
replicates 7a5735b92963a2942ae94d98974816a62219cd15
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 127.0.0.1:7000)
M: d81022ee4427a03e464008c7502e4af521abe845 127.0.0.1:7000
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: 7a5735b92963a2942ae94d98974816a62219cd15 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 69ca8f5a32e8288f71116b8d06787fa77d6daecf 127.0.0.1:7005
slots: (0 slots) slave
replicates 7a5735b92963a2942ae94d98974816a62219cd15
S: 2d0f535e8ea4364c84bf3ae150cb563a784620a2 127.0.0.1:7004
slots: (0 slots) slave
replicates 5c7af37df15107e0fa4f66bd14639e3885c6548d
M: 5c7af37df15107e0fa4f66bd14639e3885c6548d 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 041724d3c83350f8937c754ee9e1bfe9072e39ad 127.0.0.1:7003
slots: (0 slots) slave
replicates d81022ee4427a03e464008c7502e4af521abe845
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

  8. 集群搭建成功

    如果存入一个值，按照redis cluster哈希槽的算法： CRC16('key')%16384 = 6782。 那么就会把这个key 的存储分配到 B 上了。同样，当我连接 (A,B,C)任何一个节点想获取'key'这个key时，也会这样的算法，然后内部跳转到B节点上获取数据

    设置一个key

    $ redis-cli -c -p 7000
127.0.0.1:7000> set test_cluster "hello_7000"
OK
127.0.0.1:7000> keys *
1) "test_cluster"
127.0.0.1:7000> 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:4507
cluster_stats_messages_pong_sent:4427
cluster_stats_messages_sent:8934
cluster_stats_messages_ping_received:4422
cluster_stats_messages_pong_received:4507
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:8934

    查找一个key

    $ redis-cli -c -p 7001
127.0.0.1:7001> keys*
(error) ERR unknown command 'keys*'
127.0.0.1:7001> keys *
(empty list or set)
127.0.0.1:7001> get test_cluster
-> Redirected to slot [5056] located at 127.0.0.1:7000
"hello_7000"
127.0.0.1:7000>

redis主从/哨兵/集群的原理分析

  1. redis-cluster client 的原理

    http://ralphbupt.github.io/2017/03/08/redis-cluster/

参考

  1. redis 命令文档： http://redisdoc.com/topic/cluster-tutorial.html

  2. 腾讯云 ： https://cloud.tencent.com/developer/article/1432088

  3. redis-trib.rb 搭建 Redis Cluster ： https://www.jianshu.com/p/6b85a004531f

  4. https://www.cnblogs.com/kevingrace/p/7910692.html