How can I install Redis on CentOS 8 / RHEL 8?. This guide will help you to install and configure Redis server on RHEL 8 / CentOS 8 Linux system. Redis is a free and open Source in-memory data structure store. It can be used as a database server, as a message broker or for caching data in memory for faster retrieval.
The data structures supported by Redis are:
- Hashes
- sets with range queries
- Strings
- sorted lists
- Hyperloglogs
- Bitmaps
- Geospatial indexes e.t.c.
Install Redis on RHEL 8 / CentOS 8
Redis on RHEL 8 is available on AppStream repository.
$ sudo yum module list redis
AlmaLinux 8 - AppStream
Name Stream Profiles Summary
redis 5 [d] common [d] Redis persistent key-value database
redis 6 common [d] Redis persistent key-value database
Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalledAs seen from the output, Redis 6.0 is available on AppStream. Install it using yum package manager.
sudo dnf module reset redis -y
sudo yum install -y @redis:6 vimOnce the package is installed, start and enable Redis service to start on boot.
sudo systemctl enable --now redis
Service status should show running.
$ systemctl status redis
● redis.service - Redis persistent key-value database
Loaded: loaded (/usr/lib/systemd/system/redis.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/redis.service.d
└─limit.conf
Active: active (running) since Thu 2023-08-24 13:20:42 UTC; 4s ago
Main PID: 50649 (redis-server)
Tasks: 4 (limit: 49359)
Memory: 6.6M
CGroup: /system.slice/redis.service
└─50649 /usr/bin/redis-server 127.0.0.1:6379
Aug 24 13:20:42 almalinux-8.localdomain systemd[1]: Starting Redis persistent key-value database...
Aug 24 13:20:42 almalinux-8.localdomain systemd[1]: Started Redis persistent key-value database.Configure Redis Server on RHEL 8 / CentOS 8
Now that Redis server is installed, the next part is configuration. There are many tunables you can set to fit your use case, but I’ll cover the basic settings you need to get started.
Enable Redis Service to listen on all interfaces
By default, Redis service listens on 127.0.0.1. Allow the service to listen on all network interfaces if you need remote clients to connect to it.
$ ss -tunelp | grep 6379
tcp LISTEN 0 128 127.0.0.1:6379 0.0.0.0:* users:(("redis-server",pid=30348,fd=6)) uid:986 ino:71091 sk:4 <->
tcp LISTEN 0 511 [::1]:6379 [::]:* users:(("redis-server",pid=12730,fd=7)) uid:993 ino:41067 sk:6 v6only:1 <-> Open the file /etc/redis.conf with your favorite text editor
sudo vim /etc/redis.confThen change line 69 bind 127.0.0.1 to below:
bind 0.0.0.0Restart Redis after making the change
sudo systemctl restart redisConfirm new bind address.
$ ss -tunelp | grep 6379
tcp LISTEN 0 128 0.0.0.0:6379 0.0.0.0:* users:(("redis-server",pid=30348,fd=6)) uid:986 ino:71091 sk:4 <-> Configure Redis Authentication
Configure Redis Authentication for clients to require AUTH <PASSWORD> before processing any other commands.
requirepass <AuthPassword>Example:
requirepass StrongPassword
Set Persistent Store for Recovery
Set persistence mode by changing the appendonlyvalue to yes
appendonly yes
appendfilename "appendonly.aof"Restart redis service after making the changes
sudo systemctl restart redisIf you have an active firewalld service, allow port 6379
sudo firewall-cmd --add-port=6379/tcp --permanent
sudo firewall-cmd --reloadCheck redis service status:
systemctl status redis
Connect to Redis
Confirm that you can connect to Redis Server locally:
$ redis-cli
127.0.0.1:6379> INFO
NOAUTH Authentication required.Test authenticate:
127.0.0.1:6379> AUTH <AuthPassword>
OKYou should receive OK in the output. If you input a wrong password, Authentication should fail:
127.0.0.1:6379> AUTH WrongPassword
(error) ERR invalid passwordCheck redis information.
127.0.0.1:6379> INFOThis will output a long list of data. You can limit the output by passing Section as an argument. E.g.
127.0.0.1:6379> INFO Server
# Server
redis_version:5.0.3
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:14b81d825631ff0c
redis_mode:standalone
os:Linux 4.18.0-348.2.1.el8_5.x86_64 x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:8.4.1
process_id:50649
run_id:68cf1e816bddaf49f8bb0ea9abba1a9091a9ad0f
tcp_port:6379
uptime_in_seconds:4993
uptime_in_days:0
hz:10
configured_hz:10
lru_clock:8911378
executable:/usr/bin/redis-server
config_file:/etc/redis.confPerform Redis Benchmarking
Run the benchmark with 10 parallel connections, for a total of 100k requests, against local redis to test its performance.
# redis-benchmark -h 127.0.0.1 -p 6379 -n 100000 -c 10
..................................................
100.00% <= 0 milliseconds
85470.09 requests per second
====== LRANGE_500 (first 450 elements) ======
100000 requests completed in 1.17 seconds
10 parallel clients
3 bytes payload
keep alive: 1
100.00% <= 0 milliseconds
85397.09 requests per second
====== LRANGE_600 (first 600 elements) ======
100000 requests completed in 1.18 seconds
10 parallel clients
3 bytes payload
keep alive: 1
100.00% <= 0 milliseconds
84530.86 requests per second
====== MSET (10 keys) ======
100000 requests completed in 1.18 seconds
10 parallel clients
3 bytes payload
keep alive: 1
100.00% <= 0 milliseconds
84961.77 requests per secondFor more options and examples, use:
redis-benchmark --helpTo show connected clients, use:
127.0.0.1:6379> client list
id=185 addr=127.0.0.1:54300 fd=8 name= age=75 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=32768 obl=0 oll=0 omem=0 events=r cmd=clientUsing Redis with Python
To use redis with Python, install Python Redis Client Library:
sudo yum -y install python-redisUsing Redis with PHP
To connect to Redis server with PHP, install PHP Redis Client Module.
sudo yum -y install php-pecl-redisEnjoy using Redis on RHEL 8 / CentOS 8. If you’re interested in setting up monitoring for your Redis Server, then check:
