作业

 

 

1、RDB和AOF的优缺点

RDB优点：

  • RDB快照保存了某个时间点的数据，可以通过脚本执行redis指令bgsave(非阻塞，后台执行)或者 save(会阻塞写操作,不推荐)命令自定义时间点备份，可以保留多个备份，当出现问题可以恢复到不同时间点的版本,很适合备份,并且此文件格式也支持有不少第三方工具可以进行后续的数据分析

    比如: 可以在最近的24小时内，每小时备份一次RDB文件，并且在每个月的每一天，也备份一个 ROB文件。这样的话，即使遇上问题，也可以随时将数据集还原到不同的版本。

  • RDB可以最大化Redis的性能，父进程在保存 RDB文件时唯一要做的就是fork出一个子进程，然后 这个子进程就会处理接下来的所有保存工作，父进程无须执行任何磁盘工/0操作。

  • RDB在大量数据,比如几个G的数据，恢复的速度比AOF的快

RDB缺点：

  • 不能实时保存数据，可能会丢失自上一次执行RDB备份到当前的内存数据

    如果你需要尽量避免在服务器故障时丢失数据，那么RDB不适合你。虽然Redis允许你设置不同的 保存点（save point）来控制保存RDB文件的频率，但是，因为ROB文件需要保存整个数据集的状态，所以它并不是一个轻松的操作。因此你可能会至少5分钟才保存一次RDB文件。在这种情况 下，一旦发生故障停机，你就可能会丢失好几分钟的数据。 （不能保证数据一点不丢失）

  • 当数据量非常大的时候，从父进程fork子进程进行保存至RDB文件时需要一点时间，可能是毫秒或 者秒，取决于磁盘IO性能

  • 在数据集比较庞大时，fork()可能会非常耗时，造成服务器在一定时间内停止处理客户端﹔如果数 据集非常巨大，并且CPU时间非常紧张的话，那么这种停止时间甚至可能会长达整整一秒或更久。

  • 虽然 AOF重写也需要进行fork()，但无论AOF重写的执行间隔有多长，数据的持久性都不会有任何损失。

 

AOF 优点：

  • 数据安全性相对较高，根据所使用的fsync策略(fsync是同步内存中redis所有已经修改的文件到存 储设备)，默认是appendfsync everysec，即每秒执行一次 fsync,在这种配置下，Redis 仍然可以保持良好的性能，并且就算发生故障停机，也最多只会丢失一秒钟的数据( fsync会在后台线程执 行，所以主线程可以继续努力地处理命令请求)

  • 由于该机制对日志文件的写入操作采用的是append模式，因此在写入过程中不需要seek, 即使出现宕机现象，也不会破坏日志文件中已经存在的内容。然而如果本次操作只是写入了一半数据就出现了系统崩溃问题，不用担心，在Redis下一次启动之前，可以通过 redis-check-aof 工具来解决数据一致性的问题

  • Redis可以在 AOF文件体积变得过大时，自动地在后台对AOF进行重写:重写后的新AOF文件包含了恢复当前数据集所需的最小命令集合。整个重写操作是绝对安全的，因为Redis在创建新 AOF文件的过程中，append模式不断的将修改数据追加到现有的 AOF文件里面，即使重写过程中发生停 机，现有的 AOF文件也不会丢失。而一旦新AOF文件创建完毕，Redis就会从旧AOF文件切换到新 AOF文件，并开始对新AOF文件进行追加操作。

  • AOF包含一个格式清晰、易于理解的日志文件用于记录所有的修改操作。事实上，也可以通过该文件完成数据的重建AOF文件有序地保存了对数据库执行的所有写入操作，这些写入操作以Redis协议的格式保存，因此 AOF文件的内容非常容易被人读懂，对文件进行分析(parse)也很轻松。导出（export)AOF文件 也非常简单:举个例子，如果你不小心执行了FLUSHALL.命令，但只要AOF文件未被重写，那么只 要停止服务器，移除 AOF文件末尾的FLUSHAL命令，并重启Redis ,就可以将数据集恢复到 FLUSHALL执行之前的状态。

AOF缺点：

  • 即使有些操作是重复的也会全部记录，AOF 的文件大小要大于 RDB 格式的文件

  • AOF 在恢复大数据集时的速度比 RDB 的恢复速度要慢

  • 根据fsync策略不同,AOF速度可能会慢于RDB

  • bug 出现的可能性更多


2、master和slave同步过程

环境：
两台机器
10.0.0.8       master
10.0.0.18     slave

#两台机器安装redis服务并启动
[root@centos8 ~]#yum -y install redis
[root@centos8 ~]#systemctl start redis
[root@centos18 ~]#yum -y install redis
[root@centos18 ~]#systemctl start redis
#主节点进行配置
[root@centos8 ~]#vim /etc/redis.conf
69 bind 0.0.0.0
88 protected-mode yes
308 replica-serve-stale-data yes
324 replica-read-only yes
355 repl-diskless-sync no
367 repl-diskless-sync-delay 5
#设置连接密码
[root@centos8 ~]#redis-cli
127.0.0.1:6379> CONFIG SET requirepass 123456
OK
#重启服务
[root@centos8 ~]#systemctl restart redis
#从节点进行设置
#查看是否能够远程连接10.0.0.8
[root@centos18 ~]#redis-cli -h 10.0.0.8 -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.0.0.8:6379>
#搭建主从节点
#登录本机，输入主服务器的IP和端口号
#在slave上设置master的IP和端口，4.0版之前的指令为slaveof
127.0.0.1:6379> REPLICAOF 10.0.0.8 6379 #仍可使用SLAVEOF MasterIP Port
OK
#输入主服务器的密码进行同步，进行全量复制
#在slave上设置master的密码，才可以同步
127.0.0.1:6379> CONFIG SET masterauth 123456
OK
127.0.0.1:6379> INFO replication
# Replication   #角色变为slave
role:slave
master_host:10.0.0.8   #指向master
master_port:6379
master_link_status:up
master_last_io_seconds_ago:8
master_sync_in_progress:0
slave_repl_offset:42
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:b69908f23236fb20b810d198f7f4539f795e0ee5
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
#在所有slave节点保存配置到redis.conf
[root@centos18 ~]#vim /etc/redis.conf
 .......
# replicaof <masterip> <masterport>
replicaof 10.0.0.8 6379 #指定master的IP和端口号
# If the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the replica to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the replica request.
# masterauth <master-password>
masterauth 123456     #如果密码需要设置
.......

注：主从搭建完毕，搭建成功，从节点只能读不能写
 

 

3、哨兵的使用和实现机制

#前提是已经实现了一主两从的搭建

 
环境

master      10.0.0.8

slave1        10.0.0.18

slave2         10.0.0.28



#搭建一主两从
#三台机器安装redis服务并启动
[root@centos8 ~]#yum -y install redis
[root@centos8 ~]#systemctl start redis

[root@centos18 ~]#yum -y install redis
[root@centos18 ~]#systemctl start redis

[root@centos28 ~]#yum -y install redis
[root@centos28 ~]#systemctl start redis

#主节点进行配置
[root@centos8 ~]#vim /etc/redis.conf
69 bind 0.0.0.0
88 protected-mode yes
308 replica-serve-stale-data yes

324 replica-read-only yes

355 repl-diskless-sync no

367 repl-diskless-sync-delay 5

#设置连接密码

[root@centos8 ~]#redis-cli
127.0.0.1:6379> CONFIG SET requirepass 123456
OK
#重启服务
[root@centos8 ~]#systemctl restart redis
#从节点进行设置

#查看是否能够远程连接10.0.0.8
[root@centos18 ~]#redis-cli -h 10.0.0.8 -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.0.0.8:6379> 
#搭建主从节点
#登录本机，输入主服务器的IP和端口号
#在slave上设置master的IP和端口，4.0版之前的指令为slaveof 
127.0.0.1:6379> REPLICAOF 10.0.0.8 6379 #仍可使用SLAVEOF MasterIP Port
OK
#输入主服务器的密码进行同步，进行全量复制
#在slave上设置master的密码，才可以同步
127.0.0.1:6379> CONFIG SET masterauth 123456
OK
127.0.0.1:6379> INFO replication
# Replication   #角色变为slave
role:slave
master_host:10.0.0.8   #指向master
master_port:6379
master_link_status:up
master_last_io_seconds_ago:8
master_sync_in_progress:0
slave_repl_offset:42
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:b69908f23236fb20b810d198f7f4539f795e0ee5
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

#在所有slave节点保存配置到redis.conf
[root@centos18 ~]#vim /etc/redis.conf 
 .......
# replicaof <masterip> <masterport>
replicaof 10.0.0.8 6379 #指定master的IP和端口号
# If the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the replica to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the replica request.
# masterauth <master-password>
masterauth 123456     #如果密码需要设置
.......

#查看是否能够远程连接10.0.0.8
[root@centos28 ~]#redis-cli -h 10.0.0.8 -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.0.0.8:6379> 
#搭建主从节点
#登录本机，输入主服务器的IP和端口号
#在slave上设置master的IP和端口，4.0版之前的指令为slaveof 
127.0.0.1:6379> REPLICAOF 10.0.0.8 6379 #仍可使用SLAVEOF MasterIP Port
OK
#输入主服务器的密码进行同步，进行全量复制
#在slave上设置master的密码，才可以同步
127.0.0.1:6379> CONFIG SET masterauth 123456
OK
127.0.0.1:6379> INFO replication
# Replication   #角色变为slave
role:slave
master_host:10.0.0.8   #指向master
master_port:6379
master_link_status:up
master_last_io_seconds_ago:8
master_sync_in_progress:0
slave_repl_offset:42
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:b69908f23236fb20b810d198f7f4539f795e0ee5
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

#在所有slave节点保存配置到redis.conf
[root@centos28 ~]#vim /etc/redis.conf 
 .......
# replicaof <masterip> <masterport>
replicaof 10.0.0.8 6379 #指定master的IP和端口号
# If the master is password protected (using the "requirepass" configuration
# directive below) it is possible to tell the replica to authenticate before
# starting the replication synchronization process, otherwise the master will
# refuse the replica request.
# masterauth <master-password>
masterauth 123456     #如果密码需要设置
.......


#所有主从节点的redis.conf中关键配置
#三台机器全部配置成以下三步
[root@centos8 ~]#vim /etc/redis.conf
bind 0.0.0.0
masterauth "123456"
requirepass "123456"
[root@centos8 ~]#systemctl restart redis

[root@centos18 ~]#vim /etc/redis.conf
bind 0.0.0.0
masterauth "123456"
requirepass "123456"
[root@centos18 ~]#systemctl restart redis

[root@centos28 ~]#vim /etc/redis.conf
bind 0.0.0.0
masterauth "123456"
requirepass "123456"
[root@centos18 ~]#systemctl restart redis

#三个哨兵服务器的配置如下
[root@centos8 ~]#grep -vE "^#|^$" /etc/redis-sentinel.conf
port 26379
daemonize no
pidfile "/var/run/redis-sentinel.pid"
logfile "/var/log/redis/sentinel.log"
dir "/tmp"
sentinel monitor mymaster 10.0.0.8 6379 2   #修改此行
sentinel auth-pass mymaster 123456 #增加此行
sentinel down-after-milliseconds mymaster 3000   #修改此行
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 180000
sentinel deny-scripts-reconfig yes

#以下内容自动生成，不需要修改
sentinel myid 50547f34ed71fd48c197924969937e738a39975b  #此行每个哨兵主机自动生成,且必须唯一
.....
# Generated by CONFIG REWRITE
protected-mode no
supervised systemd
sentinel leader-epoch mymaster 0
sentinel known-replica mymaster 10.0.0.28 6379
sentinel known-replica mymaster 10.0.0.18 6379
sentinel current-epoch 0

[root@centos8 ~]#scp /etc/redis-sentinel.conf redis-slave1:/etc/
[root@centos8 ~]#scp /etc/redis-sentinel.conf redis-slave2:/etc/

#三台哨兵服务器都要启动
###确保每个哨兵主机myid不同！！！
[root@centos18 ~]#vim /etc/redis-sentinel.conf
sentinel myid 50547f34ed71fd48c197924969937e738a39975c 
[root@centos28 ~]#vim /etc/redis-sentinel.conf
sentinel myid 50547f34ed71fd48c197924969937e738a39975d

[root@centos8 ~]#systemctl enable --now redis-sentinel.service
[root@centos18 ~]#systemctl enable --now redis-sentinel.service
[root@centos28 ~]#systemctl enable --now redis-sentinel.service
 
 

 


4、redis cluster集群创建和使用

 #此实验部署的是基于Redis 5 的redis cluster  

复制代码
#环境
10.0.0.8
10.0.0.18
10.0.0.28
10.0.0.38
10.0.0.48
10.0.0.58

注：
1. 每个redis 节点采用相同的硬件配置、相同的密码、相同的redis版本 
2. 所有redis服务器必须没有任何数据 
3. 先启动为单机redis且没有任何key value 

#配置

1.####以下内容六台机器均需要执行，在此只写出在一台机器上的执行过程，其余参考第一台机器的执行过程进行执行####
[root@centos8 ~]#dnf -y install redis
#批量修改配置文件
[root@centos8 ~]#sed -i.bak -e 's/bind 127.0.0.1/bind 0.0.0.0/' -e '/masterauth/a masterauth 123456' -e '/# requirepass/a requirepass 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' /etc/redis.conf
[root@centos8 ~]#systemctl enable --now  redis

2.#创建集群
# --cluster-replicas 1 表示每个master对应一个slave节点
[root@centos8 ~]#redis-cli -a 123456 --cluster create 10.0.0.8:6379 10.0.0.18:6379 10.0.0.28:6379 10.0.0.38:6379 10.0.0.48:6379 10.0.0.58:6379 --cluster-replicas 1

3.#六台机器分别查看主从状态，在此也是只写出一台机器的执行状态
[root@centos8 ~]#redis-cli -a 123456 -c INFO replication
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
# Replication
role:master
connected_slaves:1
slave0:ip=10.0.0.38,port=6379,state=online,offset=896,lag=1
master_replid:3a388865080d779180ff240cb75766e7e57877da
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:896
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:896

4.#查看指定master节点的slave节点的信息
[root@centos8 ~]#redis-cli -a 123456 cluster nodes
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602571565772 12 connected 10923-16383
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 slave
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 0 1602571565000 11 connected
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602571564000 11 connected 5462-10922
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 slave
4f146b1ac51549469036a272c60ea97f065ef832 0 1602571565000 12 connected
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602571566000 10 connected 0-5461
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602571566780 10 connected
 
#以下命令查看指定master节点的slave节点信息,其中
#a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 为master节点的ID
[root@centos8 ~]#redis-cli -a 123456 cluster slaves a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab
1) "cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602571574844 10 connected"
5.#验证集群状态
[root@centos8 ~]#
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  #节点数
cluster_size:3                        #三个集群
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:837
cluster_stats_messages_pong_sent:811
cluster_stats_messages_sent:1648
cluster_stats_messages_ping_received:806
cluster_stats_messages_pong_received:837
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:1648
#查看任意节点的集群状态
[root@centos8 ~]#redis-cli -a 123456 --cluster info 10.0.0.38:6379
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
10.0.0.18:6379 (99720241...) -> 0 keys | 5462 slots | 1 slaves.
10.0.0.28:6379 (d34da866...) -> 0 keys | 5461 slots | 1 slaves.
10.0.0.8:6379 (cb028b83...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.00 keys per slot on average.
 
6.#查看集群node对应关系
[root@redis-node1 ~]#redis-cli -a 123456 CLUSTER NODES
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379@16379 slave
d34da8666a6f587283a1c2fca5d13691407f9462 0 1582344815790 6 connected
f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379@16379 slave
cb028b83f9dc463d732f6e76ca6bbcd469d948a7 0 1582344811000 4 connected
d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379@16379 slave
99720241248ff0e4c6fa65c2385e92468b3b5993 0 1582344815000 5 connected
99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379@16379 master - 0
1582344813000 2 connected 5461-10922
d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379@16379 master - 0
1582344814780 3 connected 10923-16383
cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379@16379 myself,master - 0
1582344813000 1 connected 0-5460
[root@redis-node1 ~]#redis-cli -a 123456 --cluster check 10.0.0.38:6379
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
10.0.0.18:6379 (99720241...) -> 0 keys | 5462 slots | 1 slaves.
10.0.0.28:6379 (d34da866...) -> 0 keys | 5461 slots | 1 slaves.
10.0.0.8:6379 (cb028b83...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 10.0.0.38:6379)
S: f9adcfb8f5a037b257af35fa548a26ffbadc852d 10.0.0.38:6379
   slots: (0 slots) slave
   replicates cb028b83f9dc463d732f6e76ca6bbcd469d948a7
S: d04e524daec4d8e22bdada7f21a9487c2d3e1057 10.0.0.48:6379
   slots: (0 slots) slave
   replicates 99720241248ff0e4c6fa65c2385e92468b3b5993
   M: 99720241248ff0e4c6fa65c2385e92468b3b5993 10.0.0.18:6379
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: 9875b50925b4e4f29598e6072e5937f90df9fc71 10.0.0.58:6379
   slots: (0 slots) slave
   replicates d34da8666a6f587283a1c2fca5d13691407f9462
M: d34da8666a6f587283a1c2fca5d13691407f9462 10.0.0.28:6379
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
M: cb028b83f9dc463d732f6e76ca6bbcd469d948a7 10.0.0.8:6379
   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.
 
7.#验证集群写入key
#经过算法计算，当前key的槽位需要写入指定的node
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.8 SET key1 values1
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
(error) MOVED 9189 10.0.0.18:6379    #槽位不在当前node所以无法写入
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 SET key1 values1
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
OK
#指定node可写入
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key1
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
"values1"
#对应的slave节点可以KEYS *,但GET key1失败,可以到master上执行GET key1
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.48 KEYS "*"
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
1) "key1"
[root@redis-node1 ~]#redis-cli -a 123456 -h 10.0.0.48 GET key1
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
(error) MOVED 9189 10.0.0.18:6379
 
#redis cluster 计算key 所有slot
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster nodes
4f146b1ac51549469036a272c60ea97f065ef832 10.0.0.28:6379@16379 master - 0
1602561649000 12 connected 10923-16383
779a24884dbe1ceb848a685c669ec5326e6c8944 10.0.0.48:6379@16379 slave
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 0 1602561648000 11 connected
97c5dcc3f33c2fc75c7fdded25d05d2930a312c0 10.0.0.18:6379@16379 master - 0
1602561650000 11 connected 5462-10922
07231a50043d010426c83f3b0788e6b92e62050f 10.0.0.58:6379@16379 slave
4f146b1ac51549469036a272c60ea97f065ef832 0 1602561650229 12 connected
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 10.0.0.8:6379@16379 myself,master - 0
1602561650000 10 connected 0-5461
cb20d58870fe05de8462787cf9947239f4bc5629 10.0.0.38:6379@16379 slave
a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 0 1602561651238 10 connected
#计算得到hello对应的slot
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster keyslot hello
(integer) 866
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning set hello magedu
OK
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning cluster keyslot name
(integer) 5798
[root@centos8 ~]#redis-cli -h 10.0.0.8 -a 123456 --no-auth-warning set name wang
(error) MOVED 5798 10.0.0.18:6379
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning set name wang
OK
[root@centos8 ~]#redis-cli -h 10.0.0.18 -a 123456 --no-auth-warning get name
"wang"
[root@centos8 ~]#redis-cli -c -h 10.0.0.8 -a 123456 --no-auth-warning
10.0.0.8:6379> cluster keyslot linux
(integer) 12299
10.0.0.8:6379> set linux love
-> Redirected to slot [12299] located at 10.0.0.28:6379
OK
10.0.0.28:6379> get linux
"love"
10.0.0.28:6379> exit
[root@centos8 ~]#redis-cli -h 10.0.0.28 -a 123456 --no-auth-warning get linux
"love"
 
8.#用python脚本实现Redis Cluster集群写入
[root@centos8 ~]#dnf -y install python3
[root@centos8 ~]#pip3 install redis-py-cluster
[root@centos8 ~]#vim redis_cluster_test.py
[root@centos8 ~]#cat ./redis_cluster_test.py
#!/usr/bin/env python3
from rediscluster  import RedisCluster
startup_nodes = [
   {"host":"10.0.0.8", "port":6379},
   {"host":"10.0.0.18", "port":6379},
   {"host":"10.0.0.28", "port":6379},
   {"host":"10.0.0.38", "port":6379},
   {"host":"10.0.0.48", "port":6379},
   {"host":"10.0.0.58", "port":6379} ]
redis_conn= RedisCluster(startup_nodes=startup_nodes,password='123456',
decode_responses=True)
for i in range(0, 10000):
    redis_conn.set('key'+str(i),'value'+str(i))
    print('key'+str(i)+':',redis_conn.get('key'+str(i)))
[root@centos8 ~]#chmod +x redis_cluster_test.py
[root@centos8 ~]#./redis_cluster_test.py
......
key9998: value9998
key9999: value9999
[root@centos8 ~]#redis-cli -a 123456 -h 10.0.0.8
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
10.0.0.8:6379> DBSIZE
(integer) 3331
10.0.0.8:6379> GET key1
(error) MOVED 9189 10.0.0.18:6379
10.0.0.8:6379> GET key2
"value2"
10.0.0.8:6379> GET key3
"value3"
10.0.0.8:6379> KEYS *
......
3329) "key7832"
3330) "key2325"
3331) "key2880"
10.0.0.8:6379>
[root@centos8 ~]#redis-cli -a 123456 -h 10.0.0.18 DBSIZE
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe. (integer) 3340
[root@centos8 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key1
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
"value1"
[root@centos8 ~]#redis-cli -a 123456 -h 10.0.0.28 DBSIZE
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
(integer) 3329
[root@centos8 ~]#redis-cli -a 123456 -h 10.0.0.18 GET key5
Warning: Using a password with '-a' or '-u' option on the command line interface
may not be safe.
"value5"
[root@centos8 ~]#
posted @ 2020-11-17 09:09  Zs，  阅读(220)  评论(0)    收藏  举报