Redis and Redis Sentinel Crash Course - Redis Commands and High Availability tutorial

In This tutorial we will talk about Redis and Sentinel high availability. you will have it in 2 parts. Part 1 will all theoretical and the second will have our hands dirty with the code :D have fun!.

Part 1
- 00:52: What is Redis?
- 01:42: Redis use cases
- 02:02: Who using Redis in Production?
- 02:50: Redis Sentinel
Part 2
- 04:25: Redis Installation
- 09:30: Redis Important Comands / Strings
- INFO: Return informations and statistics about the server in a format that is simple to parse by computers and easy to read by humans
- KEYS: Returns all keys matching pattern
- SET: Add/update a record
- GET: Gets a single record
- EXISTS: Returns if a record exists or not (0 or 1)
- EXPIRE: Set a timeout on a key. After the timeout has expired, the key will automatically be deleted
- TTL: Returns the remaining time to live of a key that has a timeout
- SETEX: Equivalent to executing SET and EXPIRE
- SETNX: Set a single record if not exists
- INCR: Increment a number by 1
- INCRBY: Increment by a different number
- DECR: Decrement by 1
- DECRBY: Decrement by a different number
- APPEND: Appends the value at the end of a string
- MGET: Gets multiple records
- MSET: Sets multiple record
- DEL: Delete one or multiple records
- 19:15: Redis Important Comands / Hashes
- HSET: Sets field in the hash stored at key to value
- HGET: Returns the value associated with field in the hash stored at key.
- HMGET: Returns the multiple values associated with field in the hash stored at key.
- HMSET: Sets multiple values associated with field in the hash stored at key.
- HGETALL: Returns all fields and values of the hash stored at key
- HINCRBY: Increment by a different number
- HDECRBY: Decrement by a different number
- 24:05: Redis Important Comands / Sets
- SADD: Add the specified members to the set stored at key. Specified members that are already a member of this set are ignored
- SMEMBERS: Returns all the members of the set
- SCARD: Returns the set cardinality (number of elements)
- SISMEMBER: Returns if member is a member of the set stored at key.
- SREM: Remove the specified members from the set stored at key
- 25:58: Redis Important Comands / Sorted Sets
- ZADD: Adds specified members with the specified scores to the sorted set
- ZRANGE: Returns the specified range of elements in the sorted set stored at key. The elements are considered to be ordered from the lowest to the highest score
- ZREM: Removes the specified members from the sorted set stored at key. Non existing members are ignored.
- ZSCORE: Returns the score of member in the sorted set at key.
- 27:54: Redis Important Comands / Pub-Sub
- PUBLISH: Posts a message to the given channel.
- SUBSCRIBE: Subscribes the client to the specified channels.
- 30:06: Redis Important Comands / Transactions
- MULTI: Marks the start of a transaction block. Subsequent commands will be queued for atomic execution using EXEC.
- EXEC: Executes all previously queued commands in a transaction.
- DISCARD: Flushes all previously queued commands in a transaction.
- 31:50: Redis Important Comands / Connection
- AUTH: Request for authentication in a password-protected Redis server.
- PING: used to test if a connection is still alive, or to measure latency. Returns PONG if no argument is provided, otherwise return a copy of the argument as a bulk.
- SELECT: Selectable Redis databases are a form of namespacing.
- 34:46: Slave Master configuration
- 39:49: Sentinel Configuration and Failover test

[jeff]

Thank you for this video. Lays out Sentinel on Docker better than any other tutorial I have seen. Great!!

[kharthigeyan]

This Crash course is very nice, please post more like this video about the architecture of sentinel, etc.

[poshan-nandam]

This is the best tutorial available for redis in youtube. Everything is very clear and very useful. Thanks!

[motarski]

Perfect! Straith to the point easily understandable demo. Thanks for sharing, it's awesome.

[AkshayGupta-ddht]

update ... in case slave can not connect to master due to protected issue - update this in both .conf
"protected-mode no"

[riccardomarzo]

Very very useful, thank you so much 4 sharing your know-how with us!!

[Universe_Stormer]

This was very useful for me. Thank you!

[haiduongcong]

Greate video. Can I ask what is your terminal or OS you using in the video?

[holyquraan]

Great tutorial, one question though, I followed the tutorial step by step and getting error: Can't resolve instance hostname for Redis Sentinel, any thoughts ?

*** FATAL CONFIG FILE ERROR (Redis 6.2.3) ***
redis-sentinelOne | Reading the configuration file, at line 84
redis-sentinelOne | >>> 'sentinel monitor mymaster redis-master 6379 1'
redis-sentinelOne | Can't resolve instance hostname.

[jasonshen]

nice tut question here, what if the master and slave is on a different server, if the master goes down, how does the slave become master gets its data from>?

[varunbhardwaj]

I need some help setting up sentinel in master slave setup with 1 master and 2 slaves . After failover the resurrected master is not getting placed into master slave setup unless sentinel is restarted

[wryamhamad]

Thank you for sharing this tutorial but i have permission issue

[marianogastaldi]

I have a question. I did this in a remote server but when I want to access it from my laptop It tells me "Reset by Peer" Do you know why ?

[jadewensylfariscal]

Hello, How can i fix the problem : data on master is not appearing in slave I followed your tutorial i'm on 38:12 of the video

[kapssul]

we ain't seeing a damn thing, you need to redo the recording.. zoom in the text..