redis 5.0.5集羣部署與故障模擬

背景

業務穩定性要求需要一套redis集羣來保障
因此採用 redis cluster 集羣

環境

名稱 ip地址 cpu 內存 master端口 slave端口
redis-651 10.65.6.51 4c 8G 7001 7002
redis-652 10.65.6.52 4c 8G 7001 7002
redis-653 10.65.6.53 4c 8G 7001 7002

安裝配置,以10.65.6.51 爲例

#下載軟件包
wget http://download.redis.io/releases/redis-5.0.5.tar.gz

#編譯安裝、
tar -zxvf redis-5.0.5.tar.gz 
cd redis-5.0.5
make && make install

#修改必要的環境參數
echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag
echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled

#加入開機啓動項:
vi /etc/rc.local
echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag
echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled

#修改內核參數
vi /etc/sysctl.conf
vm.overcommit_memory = 1
net.core.somaxconn= 1024
vm.max_map_count=655360

#修改連接數
ulimit -n 655350

#創建redis用戶
useradd -d /exporter/redis -m redis

#在redis用戶根目錄創建redis_cluster
su - redis
mkdir redis_cluster
mkdir logs

#在 redis_cluster 目錄下,創建名爲7001、7002的目錄,並將 redis.conf 拷貝到這二個目錄中,提前準備好 redis 配置文件
cd redis_cluster
mkdir 7001 7002

#配置 7001 redis.conf 文件並啓動實例
cd 7001 

#cat redis.conf 

bind 0.0.0.0
protected-mode yes
port 7001
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /exporter/redis/redis_7001.pid
loglevel notice
logfile "/exporter/redis/logs/redis-7001.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump-7001.rdb
dir ./
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
maxmemory 2147483648
appendonly yes
appendfilename "appendonly-7001.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
cluster-enabled yes
cluster-config-file nodes-7001.conf
cluster-node-timeout 15000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
masterauth m2i3s5
requirepass m2i3s5

# cat start.sh
redis-server ./redis.conf &

#啓動 7001 redis 實例
bash start.sh

#配置 7002 redis.conf 文件並啓動實例
cd /exporter/redis/redis_cluster/7002

$ cat redis.conf 
bind 0.0.0.0
protected-mode yes
port 7002
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /exporter/redis/redis_7002.pid
loglevel notice
logfile "/exporter/redis/logs/redis-7002.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump-7002.rdb
dir ./
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
maxmemory 2147483648
appendonly yes
appendfilename "appendonly-7002.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
cluster-enabled yes
cluster-config-file nodes-7002.conf
cluster-node-timeout 15000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
masterauth m2i3s5
requirepass m2i3s5


# cat start.sh
redis-server ./redis.conf &

#啓動 7002 redis 實例
bash start.sh


#查看節點實例端口是否啓動,查看已經啓動

另外兩個服務器節點 redis實例配置並啓動

按照10.65.6.51 實例配置,依次啓動redis 實例

創建集羣

redis-cli -a m2i3s5  --cluster create 10.65.6.51:7001 10.65.6.51:7002 10.65.6.52:7001 10.65.6.52:7002 10.65.6.53:7001 10.65.6.53:7002 --cluster-replicas 1 

輸入 yes 自動完成集羣創建

#參數
–cluster-replicas 1 
最後面的數字是指每個master帶有多少個slave從結點。
這裏最後的數是1,那就是每個master節點有一個slave從節點。如果最後的數字是2,那麼代表每個master對應2個slave從結點。

-a 指定密碼


# 查看集羣信息
$  redis-cli  -c  -p 7002  -h 10.65.6.53      -a m2i3sc5  
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.65.6.53:7002> CLUSTER nodes
5a3ac40d4fb508294581d54a5f1c78482e7510bc 10.65.6.51:7001@17001 master - 0 1667381997109 1 connected 0-5460
feec77be74afc3822711614ae9108f5b77f3fa11 10.65.6.53:7001@17001 master - 0 1667381995099 10 connected 10923-16383
3988c010767e71c4b86941a709d5ae7c96d2a662 10.65.6.53:7002@17002 myself,slave 5a3ac40d4fb508294581d54a5f1c78482e7510bc 0 1667381985000 0 connected
3299250eeb002bd9a24a7f69900ab6795a908c67 10.65.6.52:7002@17002 slave feec77be74afc3822711614ae9108f5b77f3fa11 0 1667381996103 10 connected
26a308f4be77175789d8d400aec57ae16548122b 10.65.6.51:7002@17002 slave 218f90ba77b311c205ca7c96daa64a6f27aa363c 0 1667381994094 9 connected
218f90ba77b311c205ca7c96daa64a6f27aa363c 10.65.6.52:7001@17001 master - 0 1667381993091 9 connected 5461-10922


#主從關係
master               slave
10.65.6.51:7001   10.65.6.53:7002 
10.65.6.52:7001   10.65.6.51:7002
10.65.6.53:7001   10.65.6.52:7002

調整集羣內存

# redis-cli  -c  -p 7001  -h 10.65.6.53      -a m2i3s5
10.65.6.53:7001> info memory 

#maxmemory_human:2.00G,將集羣內存調整至 3G
# redis-cli  -c  -p 7001  -h 10.65.6.53      -a m2i3s5
10.65.6.53:7001> info memory 

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