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[redis-cli] a few Redis commands are useful.

Posted on November 17, 2021November 7, 2024 By nim No Comments on [redis-cli] a few Redis commands are useful.

Contents

Toggle
  • Cài gói trên ubuntu:
  • Các lệnh:
    • Ping/Pong
    • List các client connect vào redis:
    • Nếu redis của bạn có pass work thì gõ như sau:
    • Một số command của mình sưu tầm được mà chưa hiểu chức năng
    • show replication KeyDB
  • Video
  • benchmarking
  • redis TLS
  • Why is a Redis node read-only?

Cài gói trên ubuntu:

apt-get install redis-tools

Các lệnh:

Ping/Pong

redis-cli -h nimtechnology.com info
>>>output là một số thông tin của con redis hay keydb
redis-cli -h nimtechnology.com 
ping 
>>>out Pong

List các client connect vào redis:

redis-cli client list
https://stackoverflow.com/questions/47671154/how-to-get-all-connected-clients-of-redis-cluster
https://redis.io/commands/client-list

Nếu redis của bạn có pass work thì gõ như sau:

redis-cli -a PASSWORD client list

Một số command của mình sưu tầm được mà chưa hiểu chức năng

https://github.com/spinnaker/spinnaker/issues/5678

redis-cli -h 10.x.x.4 keys "*"  | head -100000 | awk -F":" '{print $1 ":" $2}' | sort -rn | uniq -c | sort -rn | head -10

redis-cli -a PASSWORD KEYS “*” | xargs redis-cli -a PASSWORD DEL

show replication KeyDB

https://blkcipher.pl/posts/2020-10-16-keydb-replikacja_active-replica_i_multi-master/
redis-cli info replication

Video

benchmarking

https://docs.keydb.dev/docs/benchmarking/

docker run --rm redislabs/memtier_benchmark:latest memtier_benchmark -s 192.168.101.44 -p 31189 --hide-histogram --requests=20000 --clients=100 --pipeline=20 --data-size=128

redis TLS

Khi bạn thực hiện ping/pong mà thấy thấy nó bị treo và không trả về response thì bạn có thể đoán được là redis có bật tls
https://aws.amazon.com/premiumsupport/knowledge-center/elasticache-redis-cluster-fix-connection/

redis-cli -h encrypted.1234id.clustercfg.euw1.cache.amazonaws.com -p 6379 --tls

Why is a Redis node read-only?

Khi deploy 1 redis cluster bạn sẽ mong muốn bạn sẽ read hoặc write trên tất cả các node:
Nhưng nếu bạn không để ý thì rất có thể application của bạn chỉ đang read trên 1 node:

Let’s look into this link:
https://www.linkedin.com/pulse/explanation-uneven-load-distribution-elasticache-redis-lin/

BareMetal, Coding

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