Redis

1、RDB和AOF的優(yōu)缺點(diǎn)

RDB優(yōu)點(diǎn)：

RDB快照保存了某個(gè)時(shí)間點(diǎn)的數(shù)據(jù)，可以通過(guò)腳本執(zhí)行redis指令bgsave(非阻塞，后臺(tái)執(zhí)行)或者 save(會(huì)阻塞寫(xiě)操作,不推薦)命令自定義時(shí)間點(diǎn)備份，可以保留多個(gè)備份，當(dāng)出現(xiàn)問(wèn)題可以恢復(fù)到不同時(shí)間點(diǎn)的版本,很適合備份,并且此文件格式也支持有不少第三方工具可以進(jìn)行后續(xù)的數(shù)據(jù)分析

比如: 可以在最近的24小時(shí)內(nèi)，每小時(shí)備份一次RDB文件，并且在每個(gè)月的每一天，也備份一個(gè) ROB文件。這樣的話，即使遇上問(wèn)題，也可以隨時(shí)將數(shù)據(jù)集還原到不同的版本。
RDB可以最大化Redis的性能，父進(jìn)程在保存 RDB文件時(shí)唯一要做的就是fork出一個(gè)子進(jìn)程，然后這個(gè)子進(jìn)程就會(huì)處理接下來(lái)的所有保存工作，父進(jìn)程無(wú)須執(zhí)行任何磁盤(pán)工/0操作。
RDB在大量數(shù)據(jù),比如幾個(gè)G的數(shù)據(jù)，恢復(fù)的速度比AOF的快

RDB缺點(diǎn)：

不能實(shí)時(shí)保存數(shù)據(jù)，可能會(huì)丟失自上一次執(zhí)行RDB備份到當(dāng)前的內(nèi)存數(shù)據(jù)

如果你需要盡量避免在服務(wù)器故障時(shí)丟失數(shù)據(jù)，那么RDB不適合你。雖然Redis允許你設(shè)置不同的保存點(diǎn)（save point）來(lái)控制保存RDB文件的頻率，但是，因?yàn)镽OB文件需要保存整個(gè)數(shù)據(jù)集的狀態(tài)，所以它并不是一個(gè)輕松的操作。因此你可能會(huì)至少5分鐘才保存一次RDB文件。在這種情況下，一旦發(fā)生故障停機(jī)，你就可能會(huì)丟失好幾分鐘的數(shù)據(jù)。（不能保證數(shù)據(jù)一點(diǎn)不丟失）
當(dāng)數(shù)據(jù)量非常大的時(shí)候，從父進(jìn)程fork子進(jìn)程進(jìn)行保存至RDB文件時(shí)需要一點(diǎn)時(shí)間，可能是毫秒或者秒，取決于磁盤(pán)IO性能
在數(shù)據(jù)集比較龐大時(shí)，fork()可能會(huì)非常耗時(shí)，造成服務(wù)器在一定時(shí)間內(nèi)停止處理客戶端﹔如果數(shù) 據(jù)集非常巨大，并且CPU時(shí)間非常緊張的話，那么這種停止時(shí)間甚至可能會(huì)長(zhǎng)達(dá)整整一秒或更久。
雖然 AOF重寫(xiě)也需要進(jìn)行fork()，但無(wú)論AOF重寫(xiě)的執(zhí)行間隔有多長(zhǎng)，數(shù)據(jù)的持久性都不會(huì)有任何損失。

AOF 優(yōu)點(diǎn)：

數(shù)據(jù)安全性相對(duì)較高，根據(jù)所使用的fsync策略(fsync是同步內(nèi)存中redis所有已經(jīng)修改的文件到存儲(chǔ)設(shè)備)，默認(rèn)是appendfsync everysec，即每秒執(zhí)行一次 fsync,在這種配置下，Redis 仍然可以保持良好的性能，并且就算發(fā)生故障停機(jī)，也最多只會(huì)丟失一秒鐘的數(shù)據(jù)( fsync會(huì)在后臺(tái)線程執(zhí) 行，所以主線程可以繼續(xù)努力地處理命令請(qǐng)求)
由于該機(jī)制對(duì)日志文件的寫(xiě)入操作采用的是append模式，因此在寫(xiě)入過(guò)程中不需要seek, 即使出現(xiàn)宕機(jī)現(xiàn)象，也不會(huì)破壞日志文件中已經(jīng)存在的內(nèi)容。然而如果本次操作只是寫(xiě)入了一半數(shù)據(jù)就出現(xiàn)了系統(tǒng)崩潰問(wèn)題，不用擔(dān)心，在Redis下一次啟動(dòng)之前，可以通過(guò) redis-check-aof 工具來(lái)解決數(shù)據(jù)一致性的問(wèn)題
Redis可以在 AOF文件體積變得過(guò)大時(shí)，自動(dòng)地在后臺(tái)對(duì)AOF進(jìn)行重寫(xiě):重寫(xiě)后的新AOF文件包含了恢復(fù)當(dāng)前數(shù)據(jù)集所需的最小命令集合。整個(gè)重寫(xiě)操作是絕對(duì)安全的，因?yàn)镽edis在創(chuàng)建新 AOF文件的過(guò)程中，append模式不斷的將修改數(shù)據(jù)追加到現(xiàn)有的 AOF文件里面，即使重寫(xiě)過(guò)程中發(fā)生停機(jī)，現(xiàn)有的 AOF文件也不會(huì)丟失。而一旦新AOF文件創(chuàng)建完畢，Redis就會(huì)從舊AOF文件切換到新 AOF文件，并開(kāi)始對(duì)新AOF文件進(jìn)行追加操作。
AOF包含一個(gè)格式清晰、易于理解的日志文件用于記錄所有的修改操作。事實(shí)上，也可以通過(guò)該文件完成數(shù)據(jù)的重建AOF文件有序地保存了對(duì)數(shù)據(jù)庫(kù)執(zhí)行的所有寫(xiě)入操作，這些寫(xiě)入操作以Redis協(xié)議的格式保存，因此 AOF文件的內(nèi)容非常容易被人讀懂，對(duì)文件進(jìn)行分析(parse)也很輕松。導(dǎo)出（export)AOF文件也非常簡(jiǎn)單:舉個(gè)例子，如果你不小心執(zhí)行了FLUSHALL.命令，但只要AOF文件未被重寫(xiě)，那么只要停止服務(wù)器，移除 AOF文件末尾的FLUSHAL命令，并重啟Redis ,就可以將數(shù)據(jù)集恢復(fù)到 FLUSHALL執(zhí)行之前的狀態(tài)。

AOF缺點(diǎn)：

即使有些操作是重復(fù)的也會(huì)全部記錄，AOF 的文件大小要大于 RDB 格式的文件
AOF 在恢復(fù)大數(shù)據(jù)集時(shí)的速度比 RDB 的恢復(fù)速度要慢
根據(jù)fsync策略不同,AOF速度可能會(huì)慢于RDB
bug 出現(xiàn)的可能性更多

2、master和slave同步過(guò)程

環(huán)境：
兩臺(tái)機(jī)器
10.0.0.8       master
10.0.0.18     slave

#兩臺(tái)機(jī)器安裝redis服務(wù)并啟動(dòng)
[root@centos8 ~]#yum -y install redis
[root@centos8 ~]#systemctl start redis

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

#主節(jié)點(diǎn)進(jìn)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

#設(shè)置連接密碼

[root@centos8 ~]#redis-cli
127.0.0.1:6379> CONFIG SET requirepass 123456
OK
#重啟服務(wù)
[root@centos8 ~]#systemctl restart redis
#從節(jié)點(diǎn)進(jìn)行設(shè)置

#查看是否能夠遠(yuǎn)程連接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>
#搭建主從節(jié)點(diǎn)
#登錄本機(jī)，輸入主服務(wù)器的IP和端口號(hào)
#在slave上設(shè)置master的IP和端口，4.0版之前的指令為slaveof
127.0.0.1:6379> REPLICAOF 10.0.0.8 6379 #仍可使用SLAVEOF MasterIP Port
OK
#輸入主服務(wù)器的密碼進(jìn)行同步，進(jìn)行全量復(fù)制
#在slave上設(shè)置master的密碼，才可以同步
127.0.0.1:6379> CONFIG SET masterauth 123456
OK
127.0.0.1:6379> INFO replication
# Replication #角色變?yōu)閟lave
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節(jié)點(diǎn)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和端口號(hào)
# 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 #如果密碼需要設(shè)置
.......

注：主從搭建完畢，搭建成功，從節(jié)點(diǎn)只能讀不能寫(xiě)

3、哨兵的使用和實(shí)現(xiàn)機(jī)制

#前提是已經(jīng)實(shí)現(xiàn)了一主兩從的搭建

環(huán)境

master      10.0.0.8

slave1        10.0.0.18

slave2         10.0.0.28



#搭建一主兩從
#三臺(tái)機(jī)器安裝redis服務(wù)并啟動(dòng)
[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

#主節(jié)點(diǎn)進(jìn)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

#設(shè)置連接密碼

[root@centos8 ~]#redis-cli
127.0.0.1:6379> CONFIG SET requirepass 123456
OK
#重啟服務(wù)
[root@centos8 ~]#systemctl restart redis
#從節(jié)點(diǎn)進(jìn)行設(shè)置

#查看是否能夠遠(yuǎn)程連接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> 
#搭建主從節(jié)點(diǎn)
#登錄本機(jī)，輸入主服務(wù)器的IP和端口號(hào)
#在slave上設(shè)置master的IP和端口，4.0版之前的指令為slaveof 
127.0.0.1:6379> REPLICAOF 10.0.0.8 6379 #仍可使用SLAVEOF MasterIP Port
OK
#輸入主服務(wù)器的密碼進(jìn)行同步，進(jìn)行全量復(fù)制
#在slave上設(shè)置master的密碼，才可以同步
127.0.0.1:6379> CONFIG SET masterauth 123456
OK
127.0.0.1:6379> INFO replication
# Replication   #角色變?yōu)閟lave
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節(jié)點(diǎn)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和端口號(hào)
# 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     #如果密碼需要設(shè)置
.......

#查看是否能夠遠(yuǎn)程連接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> 
#搭建主從節(jié)點(diǎn)
#登錄本機(jī)，輸入主服務(wù)器的IP和端口號(hào)
#在slave上設(shè)置master的IP和端口，4.0版之前的指令為slaveof 
127.0.0.1:6379> REPLICAOF 10.0.0.8 6379 #仍可使用SLAVEOF MasterIP Port
OK
#輸入主服務(wù)器的密碼進(jìn)行同步，進(jìn)行全量復(fù)制
#在slave上設(shè)置master的密碼，才可以同步
127.0.0.1:6379> CONFIG SET masterauth 123456
OK
127.0.0.1:6379> INFO replication
# Replication   #角色變?yōu)閟lave
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節(jié)點(diǎn)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和端口號(hào)
# 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     #如果密碼需要設(shè)置
.......


#所有主從節(jié)點(diǎn)的redis.conf中關(guān)鍵配置
#三臺(tái)機(jī)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

#三個(gè)哨兵服務(wù)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

#以下內(nèi)容自動(dòng)生成，不需要修改
sentinel myid 50547f34ed71fd48c197924969937e738a39975b  #此行每個(gè)哨兵主機(jī)自動(dòng)生成,且必須唯一
.....
# 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/

#三臺(tái)哨兵服務(wù)器都要啟動(dòng)
###確保每個(gè)哨兵主機(jī)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集群創(chuàng)建和使用

#此實(shí)驗(yàn)部署的是基于Redis 5 的redis cluster

#環(huán)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. 每個(gè)redis 節(jié)點(diǎn)采用相同的硬件配置、相同的密碼、相同的redis版本 
2. 所有redis服務(wù)器必須沒(méi)有任何數(shù)據(jù) 
3. 先啟動(dòng)為單機(jī)redis且沒(méi)有任何key value 

#配置

1.####以下內(nèi)容六臺(tái)機(jī)器均需要執(zhí)行，在此只寫(xiě)出在一臺(tái)機(jī)器上的執(zhí)行過(guò)程，其余參考第一臺(tái)機(jī)器的執(zhí)行過(guò)程進(jìn)行執(zhí)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.#創(chuàng)建集群
# --cluster-replicas 1 表示每個(gè)master對(duì)應(yīng)一個(gè)slave節(jié)點(diǎn)
[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.#六臺(tái)機(jī)器分別查看主從狀態(tài)，在此也是只寫(xiě)出一臺(tái)機(jī)器的執(zhí)行狀態(tài)
[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節(jié)點(diǎn)的slave節(jié)點(diǎn)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節(jié)點(diǎn)的slave節(jié)點(diǎn)信息,其中
#a177c5cbc2407ebb6230ea7e2a7de914bf8c2dab 為master節(jié)點(diǎn)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.#驗(yàn)證集群狀態(tài)
[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 #節(jié)點(diǎn)數(shù)
cluster_size:3 #三個(gè)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
#查看任意節(jié)點(diǎn)的集群狀態(tài)
[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對(duì)應(yīng)關(guān)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.#驗(yàn)證集群寫(xiě)入key

#經(jīng)過(guò)算法計(jì)算，當(dāng)前key的槽位需要寫(xiě)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 #槽位不在當(dāng)前node所以無(wú)法寫(xiě)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可寫(xiě)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"

#對(duì)應(yīng)的slave節(jié)點(diǎn)可以KEYS *,但GET key1失敗,可以到master上執(zhí)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 計(jì)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
#計(jì)算得到hello對(duì)應(yīng)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腳本實(shí)現(xiàn)Redis Cluster集群寫(xiě)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 @ 2020-10-25 18:42 肖豪閱讀(204) 評(píng)論(0) 收藏舉報(bào)

刷新頁(yè)面返回頂部

肖豪

Redis

公告