Redis Cheatsheet

Redis - In-Memory Data Structure Store

Redis ist ein Open-Source-Datenstrukturspeicher, der als Datenbank, Cache und Nachrichtenmakler verwendet wird. Es unterstützt Datenstrukturen wie Strings, Hashes, Listen, Sets, sortierte Sets mit Reichweitenabfragen, Bitmaps, Hyperlogs, Geospatialindizes und Streams. < p>

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Inhaltsverzeichnis

• [Installation](LINK_0 -%20(LINK_0)
• [Key Operations](LINK_0 -%20[String%20Operations](LINK_0 -%20[Hash%20Operations](_LINK_0 -%20[Bearbeiten](LINK_0 -%20[Einstellungen](LINK_0 -%20(__LINK_0___)
• [HyperLog Operationen](LINK_0 -%20(__LINK_0___)
• [Stream Operationen](_LINK_0__ -%20[Bit%20Operationen](_LINK_0__ -%20[Pub/Sub](_LINK_0___ -%20Transaktionen
• (Lua)](_LINK_0__)
• [Beständigkeit](LINK_0 -%20[Replikation](_LINK_0 -%20[Sentinel](_LINK_0 -%20[Cluster](LINK_0 -%20[Sicherheit](__LINK_0 -%20(_LINK_0)
• (Monitoring)(_LINK_0__)
• Beste Praktiken

Installation

Ubuntu/Debian

```bash

Install Redis

sudo apt-get update sudo apt-get install redis-server

Start Redis

sudo systemctl start redis-server sudo systemctl enable redis-server

Check status

sudo systemctl status redis-server

Connect to Redis

redis-cli ```_

CentOS/RHEL/Fedora

```bash

Install Redis

sudo yum install epel-release sudo yum install redis

Start Redis

sudo systemctl start redis sudo systemctl enable redis

Connect to Redis

redis-cli ```_

macOS

```bash

Using Homebrew

brew install redis

Start Redis

brew services start redis

Connect to Redis

redis-cli ```_

Windows

```bash

Download from https://github.com/microsoftarchive/redis/releases

Run the .msi installer

Or install via Chocolatey

choco install redis-64 ```_

Docker

```bash

Pull Redis image

docker pull redis:7

Run Redis container

docker run --name redis-container -p 6379:6379 -d redis:7

Connect to Redis in container

docker exec -it redis-container redis-cli

Run with persistence

docker run --name redis-container -p 6379:6379 -v redis-data:/data -d redis:7 redis-server --appendonly yes

Docker Compose

cat > docker-compose.yml << EOF version: '3.8' services: redis: image: redis:7 container_name: redis restart: always ports: - "6379:6379" volumes: - redis_data:/data command: redis-server --appendonly yes

volumes: redis_data: EOF

docker-compose up -d ```_

Grundlegende Befehle

Anschluss an Redis

```bash

Connect to local Redis

redis-cli

Connect to remote Redis

redis-cli -h hostname -p 6379

Connect with password

redis-cli -h hostname -p 6379 -a "password"

Ping server

PING

Expected response: PONG

Authenticate

AUTH password

Select database

SELECT 0 # Default database is 0

Quit

QUIT ```_

Informationen zum Server

```bash

Get server info

INFO INFO server INFO clients INFO memory INFO persistence INFO stats INFO replication INFO cpu INFO cluster INFO keyspace

Get configuration

CONFIG GET * CONFIG GET maxmemory

Set configuration

CONFIG SET maxmemory 1gb

Get database size

DBSIZE

Get last save time

LASTSAVE

Get server time

TIME

Monitor commands

MONITOR

Flush database

FLUSHDB # Flush current database FLUSHALL # Flush all databases ```_

Hauptgeschäfte

Grundlegende Schlüsselbefehle

```bash

Set key

SET mykey "Hello"

Get key

GET mykey

Check if key exists

EXISTS mykey

Delete key

DEL mykey

Get key type

TYPE mykey

Rename key

RENAME mykey newkey

Rename key if newkey doesn't exist

RENAMENX mykey newkey

Get random key

RANDOMKEY

Find keys by pattern

KEYS * # All keys (use with caution in production) KEYS user: KEYS name* ```_

Schlüsselüberschreitung

```bash

Set key with expiration (in seconds)

SETEX mykey 60 "Hello"

Set key with expiration (in milliseconds)

PSETEX mykey 60000 "Hello"

Set expiration on existing key (in seconds)

EXPIRE mykey 60

Set expiration on existing key (in milliseconds)

PEXPIRE mykey 60000

Set expiration with timestamp (in seconds)

EXPIREAT mykey 1672531199

Set expiration with timestamp (in milliseconds)

PEXPIREAT mykey 1672531199000

Get TTL (Time To Live) in seconds

TTL mykey

Get TTL in milliseconds

PTTL mykey

Remove expiration

PERSIST mykey ```_

Erweiterte Schlüsseloperationen

```bash

Move key to another database

MOVE mykey 1

Dump key in serialized format

DUMP mykey

Restore key from dump

RESTORE newkey 0 "\x00\x05Hello\x06\x00\x83\xbf\x0e\x8a\x8f\x8e\x01\x00"

Scan keys iteratively

SCAN 0 MATCH user:* COUNT 100

Get object information

OBJECT ENCODING mykey OBJECT FREQ mykey OBJECT IDLETIME mykey OBJECT REFCOUNT mykey ```_

String Operations

Grundzüge

```bash

Set string value

SET name "John Doe"

Get string value

GET name

Get multiple keys

MGET key1 key2 key3

Set multiple keys

MSET key1 "value1" key2 "value2" key3 "value3"

Set if not exists

SETNX mykey "value"

Get and set

GETSET mykey "newvalue"

Get substring

GETRANGE mykey 0 4

Set substring

SETRANGE mykey 6 "World"

Get string length

STRLEN mykey

Append to string

APPEND mykey "!!!" ```_

Individuelle Tätigkeiten

```bash

Increment value

INCR counter

Increment by value

INCRBY counter 10

Decrement value

DECR counter

Decrement by value

DECRBY counter 10

Increment float value

INCRBYFLOAT amount 10.5 ```_

Hash Operationen

Grundlegende Hashbefehle

```bash

Set field in hash

HSET user:1 name "John Doe" HSET user:1 email "john@example.com"

Get field from hash

HGET user:1 name

Set multiple fields in hash

HMSET user:1 name "John Doe" email "john@example.com" age 30

Get multiple fields from hash

HMGET user:1 name email age

Get all fields and values from hash

HGETALL user:1

Get all keys from hash

HKEYS user:1

Get all values from hash

HVALS user:1

Get number of fields in hash

HLEN user:1

Check if field exists in hash

HEXISTS user:1 email

Delete field from hash

HDEL user:1 age ```_

Erweiterte Hash-Operationen

```bash

Set field if not exists

HSETNX user:1 name "John Doe"

Increment integer field

HINCRBY user:1 age 1

Increment float field

HINCRBYFLOAT user:1 balance 10.5

Get string length of field value

HSTRLEN user:1 name

Scan hash fields iteratively

HSCAN user:1 0 MATCH field* COUNT 10 ```_

Liste Operationen

Befehle der Grundliste

```bash

Push to left (prepend)

LPUSH mylist "world" LPUSH mylist "hello"

Push to right (append)

RPUSH mylist "!"

Pop from left (remove and get first element)

LPOP mylist

Pop from right (remove and get last element)

RPOP mylist

Get list length

LLEN mylist

Get range of elements

LRANGE mylist 0 -1 # Get all elements LRANGE mylist 0 4

Get element by index

LINDEX mylist 0

Set element by index

LSET mylist 0 "new value"

Insert element before/after pivot

LINSERT mylist BEFORE "world" "hello" LINSERT mylist AFTER "world" "!"

Remove elements by value

LREM mylist 2 "hello" # Remove 2 occurrences of "hello"

Trim list to range

LTRIM mylist 0 4 ```_

Blockierungsliste Operationen

```bash

Blocking pop from left

BLPOP mylist 10 # Timeout 10 seconds

Blocking pop from right

BRPOP mylist 10

Blocking pop from multiple lists

BLPOP list1 list2 10

Pop from right of one list, push to left of another

RPOPLPUSH source destination

Blocking version of RPOPLPUSH

BRPOPLPUSH source destination 10 ```_

Betrieb

Grundlegende Befehle

```bash

Add members to set

SADD myset "a" "b" "c"

Get all members of set

SMEMBERS myset

Check if member exists in set

SISMEMBER myset "a"

Get number of members in set

SCARD myset

Remove members from set

SREM myset "c"

Pop random member from set

SPOP myset

Get random members from set

SRANDMEMBER myset 2 ```_

Betrieb

```bash

Set difference

SDIFF set1 set2

Store set difference

SDIFFSTORE destset set1 set2

Set intersection

SINTER set1 set2

Store set intersection

SINTERSTORE destset set1 set2

Set union

SUNION set1 set2

Store set union

SUNIONSTORE destset set1 set2

Move member from one set to another

SMOVE sourceset destset "member"

Scan set members iteratively

SSCAN myset 0 MATCH a* COUNT 10 ```_

Sortiert Set Operationen

Grundlegende sortierte Befehle

```bash

Add members with scores

ZADD myzset 1 "one" 2 "two" 3 "three"

Get members by rank (ascending)

ZRANGE myzset 0 -1 WITHSCORES

Get members by rank (descending)

ZREVRANGE myzset 0 -1 WITHSCORES

Get members by score range

ZRANGEBYSCORE myzset 1 2 WITHSCORES ZRANGEBYSCORE myzset (1 2 # Exclusive range

Get members by score range (descending)

ZREVRANGEBYSCORE myzset 2 1 WITHSCORES

Get score of member

ZSCORE myzset "one"

Get number of members in sorted set

ZCARD myzset

Get number of members in score range

ZCOUNT myzset 1 2

Get rank of member (ascending)

ZRANK myzset "two"

Get rank of member (descending)

ZREVRANK myzset "two"

Remove members

ZREM myzset "one"

Remove members by rank

ZREMRANGEBYRANK myzset 0 0

Remove members by score

ZREMRANGEBYSCORE myzset 1 2

Increment score of member

ZINCRBY myzset 2 "one" ```_

Erweiterte Sortierung Operationen

```bash

Lexicographical range queries

ZADD mylexset 0 a 0 b 0 c 0 d 0 e ZRANGEBYLEX mylexset [b (d

Pop members with lowest scores

ZPOPMIN myzset 2

Pop members with highest scores

ZPOPMAX myzset 2

Blocking pop from sorted set

BZPOPMIN myzset 10 BZPOPMAX myzset 10

Sorted set intersection

ZINTERSTORE destset 2 set1 set2 WEIGHTS 2 3 AGGREGATE SUM

Sorted set union

ZUNIONSTORE destset 2 set1 set2 WEIGHTS 2 3 AGGREGATE MAX

Scan sorted set members iteratively

ZSCAN myzset 0 MATCH a* COUNT 10 ```_

HyperLogLog-Betriebe

Einloggen für die Zukunft Befehle

```bash

Add items to HyperLogLog

PFADD myhll "a" "b" "c"

Get approximate cardinality

PFCOUNT myhll

Merge multiple HyperLogLogs

PFMERGE dest_hll hll1 hll2 ```_

Geotechnische Operationen

Grundlegende geometrische Befehle

```bash

Add geospatial items

GEOADD locations 13.361389 38.115556 "Palermo" 15.087269 37.502669 "Catania"

Get position of members

GEOPOS locations "Palermo" "Catania"

Get distance between members

GEODIST locations "Palermo" "Catania" km

Find members within radius

GEORADIUS locations 15 37 200 km WITHDIST WITHCOORD COUNT 5 ASC

Find members within radius by member

GEORADIUSBYMEMBER locations "Palermo" 100 km

Get geohash of members

GEOHASH locations "Palermo" "Catania" ```_

Operationen

Grundlegende Stream-Befehle

```bash

Add entry to stream

XADD mystream * field1 "value1" field2 "value2"

Get entries from stream

XRANGE mystream - + COUNT 2

Get entries from stream (reverse)

XREVRANGE mystream + - COUNT 2

Read from stream (blocking)

XREAD COUNT 2 STREAMS mystream 0 XREAD BLOCK 5000 STREAMS mystream $

Get stream length

XLEN mystream

Delete entries from stream

XDEL mystream 1672531199000-0

Trim stream

XTRIM mystream MAXLEN 1000 ```_

Verbrauchergruppen

```bash

Create consumer group

XGROUP CREATE mystream mygroup $

Read from stream as consumer

XREADGROUP GROUP mygroup consumer1 COUNT 1 STREAMS mystream >

Acknowledge message

XACK mystream mygroup 1672531199000-0

Get pending messages

XPENDING mystream mygroup

Claim pending message

XCLAIM mystream mygroup consumer2 3600000 1672531199000-0

Get consumer group info

XINFO GROUPS mystream

Get consumer info

XINFO CONSUMERS mystream mygroup

Destroy consumer group

XGROUP DESTROY mystream mygroup ```_

Bit Operationen

Grundlegende Bitkommandos

```bash

Set bit

SETBIT mykey 7 1

Get bit

GETBIT mykey 7

Count set bits

BITCOUNT mykey BITCOUNT mykey 0 0 # In first byte

Bitwise operations

BITOP AND destkey key1 key2 BITOP OR destkey key1 key2 BITOP XOR destkey key1 key2 BITOP NOT destkey key1

Find first set/unset bit

BITPOS mykey 1 BITPOS mykey 0 ```_

Pub/Sub

Grundlegende Pub/Subkommandos

```bash

Subscribe to channels

SUBSCRIBE channel1 channel2

Unsubscribe from channels

UNSUBSCRIBE channel1

Publish message to channel

PUBLISH channel1 "Hello, world!"

Subscribe to channels by pattern

PSUBSCRIBE news.*

Unsubscribe from channels by pattern

PUNSUBSCRIBE news.*

Get pub/sub info

PUBSUB CHANNELS PUBSUB NUMSUB channel1 PUBSUB NUMPAT ```_

Transaktionen

Grundlegende Transaktionsbefehle

```bash

Start transaction

MULTI

Queue commands

SET a 1 SET b 2 INCR a GET a

Execute transaction

EXEC

Discard transaction

DISCARD

Watch keys for changes

WATCH mykey

Unwatch keys

UNWATCH

Example with WATCH

WATCH mykey val = GET mykey val = val + 1 MULTI SET mykey val EXEC # Fails if mykey was changed by another client ```_

Scripting (Lua)

Grundlegende Skriptbefehle

```bash

Evaluate Lua script

EVAL "return redis.call("GET", KEYS[1])" 1 mykey

Evaluate script with arguments

EVAL "return KEYS[1] .. ARGV[1]" 1 mykey " world"

Load script into cache

SCRIPT LOAD "return redis.call("GET", KEYS[1])"

Evaluate cached script by SHA1

EVALSHA 1 mykey

Check if scripts exist in cache

SCRIPT EXISTS

Flush script cache

SCRIPT FLUSH

Kill running script

SCRIPT KILL ```_

Lua Script Beispiel

```lua -- atomic_incr_with_limit.lua local current = redis.call("GET", KEYS[1]) if not current then current = 0 end

local limit = tonumber(ARGV[1]) if tonumber(current) < limit then return redis.call("INCR", KEYS[1]) else return tonumber(current) end

-- Execute script EVAL "...script content..." 1 mycounter 100 ```_

Persistenz

RDB (Redis Datenbank)

```bash

Configuration (redis.conf)

save 900 1 # Save if 1 key changed in 900s save 300 10 # Save if 10 keys changed in 300s save 60 10000 # Save if 10000 keys changed in 60s

dbfilename dump.rdb dir /var/lib/redis

Manual save

SAVE # Blocking save BGSAVE # Background save ```_

AOF (nur Datei anhängen)

```bash

Configuration (redis.conf)

appendonly yes appendfilename "appendonly.aof"

AOF fsync policy

appendfsync always # Slowest, most durable

appendfsync everysec # Default, good balance

appendfsync no # Fastest, least durable

Rewrite AOF file

BGREWRITEAOF ```_

Wiederholung

Master-Slave Replikation

```bash

On slave (redis.conf)

replicaof

or SLAVEOF command

On master (redis.conf)

No specific configuration needed

Check replication status

INFO replication

Promote slave to master

REPLICAOF NO ONE

or SLAVEOF NO ONE

```_

Sentinel

Sentinel Konfiguration

```bash

sentinel.conf

sentinel monitor mymaster 127.0.0.1 6379 2 sentinel down-after-milliseconds mymaster 30000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 180000

Start Sentinel

redis-sentinel /path/to/sentinel.conf ```_

Sentinel Befehle

```bash

Connect to Sentinel

redis-cli -p 26379

Get master info

SENTINEL get-master-addr-by-name mymaster

Get master status

SENTINEL master mymaster

Get slaves status

SENTINEL slaves mymaster

Force failover

SENTINEL failover mymaster ```_

Cluster

Cluster Setup

```bash

redis.conf for cluster nodes

cluster-enabled yes cluster-config-file nodes.conf cluster-node-timeout 5000

Create cluster

redis-cli --cluster create 127.0.0.1:7000 127.0.0.1:7001 \ 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 \ --cluster-replicas 1 ```_

Clusterkommandos

```bash

Connect to cluster

redis-cli -c -p 7000

Check cluster status

CLUSTER INFO CLUSTER NODES

Add node to cluster

redis-cli --cluster add-node 127.0.0.1:7006 127.0.0.1:7000

Add replica to master

redis-cli --cluster add-node 127.0.0.1:7007 127.0.0.1:7000 --cluster-slave --cluster-master-id

Reshard cluster

redis-cli --cluster reshard 127.0.0.1:7000

Delete node from cluster

redis-cli --cluster del-node 127.0.0.1:7006

Get keys in slot

CLUSTER GETKEYSINSLOT

Get slot for key

CLUSTER KEYSLOT ```_

Sicherheit

Passwort vergessen?

```bash

redis.conf

requirepass your_strong_password

Authenticate

AUTH your_strong_password ```_

Umbenennung des Befehls

```bash

redis.conf

rename-command CONFIG "" rename-command FLUSHALL "" rename-command DEBUG "" ```_

Netzwerksicherheit

```bash

redis.conf

bind 127.0.0.1 # Bind to localhost protected-mode yes ```_

Leistungsoptimierung

Speicheroptimierung

```bash

Use appropriate data structures

Hashes for objects, sets for unique items, etc.

Use memory-efficient encodings

ziplist for small lists/hashes, intset for small sets of integers

Configure maxmemory policy

redis.conf

maxmemory 2gb maxmemory-policy allkeys-lru

Policies: volatile-lru, allkeys-lru, volatile-random, allkeys-random, volatile-ttl, noeviction

Monitor memory usage

INFO memory MEMORY USAGE mykey ```_

Latency Optimization

```bash

Use pipelining

(printf "PING\r\nSET key value\r\nGET key\r\n"; sleep 1) | nc localhost 6379

Use Lua scripts for complex atomic operations

Avoid slow commands in production

KEYS, FLUSHALL, FLUSHDB, DEBUG, MONITOR

Monitor slow log

SLOWLOG GET 10 SLOWLOG LEN SLOWLOG RESET

redis.conf

slowlog-log-slower-than 10000 # in microseconds slowlog-max-len 128 ```_

Überwachung

Redis Monitoring Tools

```bash

redis-cli

MONITOR INFO SLOWLOG GET

Redis Live

Web-based monitoring tool

Prometheus + Grafana

Use redis_exporter

Datadog, New Relic, etc.

Use their Redis integrations

```_

Best Practices

Allgemeine Best Practices

• Verwenden Sie geeignete Datenstrukturen für Ihren Anwendungsfall.
• Setzen Sie Erweiterungen auf Schlüssel, um Speicher zu verwalten.
• Verwenden Sie Pipelining für mehrere Befehle, um Latenz zu reduzieren.
• Verwenden Sie Lua-Skripte für komplexe Atomoperationen.
• Vermeiden Sie langsame Befehle in Produktionsumgebungen.
• Konfigurieren Sie Persistenz (RDB/AOF) basierend auf Ihren Haltbarkeitsanforderungen.
• Verwenden Sie Replikation für hohe Verfügbarkeit.
• Verwenden Sie Sentinel für automatische Failover.
• Verwenden Sie Cluster für horizontale Skalierung.
• Sichern Sie Ihre Redis-Instanz mit Passwörtern und Netzwerkbindung.
• Überwachen Sie Ihre Redis-Instanz für Leistung und Gesundheit.

Die besten Übungen

• *Cache-Aside Pattern: Der Anwendungscode prüft zuerst Cache, dann Datenbank.
• *Read-Through/Writ-Through: Redis ist der primäre Datenspeicher, Anwendung interagiert nur mit Redis.
• *Write-Back (Write-Behind): Schreiben gehen zu Redis, dann asynchron zu Datenbank.
• *Cache Eviction Policies: Wählen Sie die richtige maxmemory-policy_.
• ** Time-To-Live (TTL)*: Setzen Sie geeignete TTLs für geätzte Daten.

Session Store Best Practices

• Verwenden Sie SETEX, um Sitzungsdaten mit Ablauf festzulegen.
• Verwenden Sie Hashes, um Sitzungsattribute zu speichern.
• Verwenden Sie EXPIRE, um die Sitzung TTL auf Aktivität zu aktualisieren.

News Broker Best Practices

• Verwenden Sie Listen für einfache Nachrichtenqueues.
• Verwenden Sie Pub/Sub für Fan-out-Messaging.
• Verwenden Sie Streams für persistente, multi-Consumer-Nachricht-Warteschlangen.

--

Zusammenfassung

Redis ist ein vielseitiger und leistungsstarker In-Memory-Datenspeicher, der für eine Vielzahl von Anwendungen verwendet werden kann. Dieses Cheatsheet bietet einen umfassenden Überblick über Redis-Befehle und Best Practices, von grundlegenden Key-value-Operationen bis hin zu erweiterten Funktionen wie Streams, Clustering und Skripting.

Key Strengths: - Performance: In-Memory-Speicher bietet extrem schnelle Lese- und Schreibvorgänge. - Datenstrukturen*: Reicher Satz von Datenstrukturen über einfache Schlüssel-Wert-Paare hinaus. - Versatilität: Kann als Datenbank, Cache, Nachrichtenmakler und mehr verwendet werden. - Skalierbarkeit*: Unterstützt Replikation, Sentinel für hohe Verfügbarkeit und Cluster für horizontale Skalierung.

Best Use Cases: - Caching (Webseiten, Datenbankabfragen, API-Antworten) - Sitzungsmanagement - Echtzeitanalysen (Führungstafeln, Zähler) - Nachrichtenwarte und Auftragsbearbeitung - Pub/Sub Messaging Systeme - Geo-Anwendungen

Importierte Überlegungen: - Als In-Memory ist die Datengröße durch verfügbares RAM begrenzt. - Die Persistenzkonfiguration ist entscheidend, um Datenverlust zu verhindern. - Sicherheit muss richtig konfiguriert werden, um unbefugten Zugriff zu verhindern. - Das Verständnis von Datenstrukturen ist entscheidend für eine effektive Nutzung.

Durch die Verwendung der Befehle und Muster in diesem Cheatsheet können Sie leistungsstarke, skalierbare und leistungsstarke Anwendungen mit Redis aufbauen.

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