Redis Installation Skill

Overview

Production-grade installation skill for Redis across all major platforms with automated verification and configuration validation.

Supported Platforms

Linux (Ubuntu/Debian)

# Update and install
sudo apt update
sudo apt install redis-server -y

# Start and enable
sudo systemctl start redis-server
sudo systemctl enable redis-server

# Verify
redis-cli ping  # Returns PONG

Linux (RHEL/CentOS/Rocky)

# Install EPEL and Redis
sudo dnf install epel-release -y
sudo dnf install redis -y

# Start and enable
sudo systemctl start redis
sudo systemctl enable redis

macOS (Homebrew)

# Install
brew install redis

# Start as service
brew services start redis

# Or run manually
redis-server /opt/homebrew/etc/redis.conf

Docker

# Simple run
docker run -d --name redis -p 6379:6379 redis:7-alpine

# With persistence
docker run -d --name redis \
  -p 6379:6379 \
  -v redis-data:/data \
  redis:7-alpine redis-server --appendonly yes

# With custom config
docker run -d --name redis \
  -p 6379:6379 \
  -v $(pwd)/redis.conf:/usr/local/etc/redis/redis.conf \
  redis:7-alpine redis-server /usr/local/etc/redis/redis.conf

Kubernetes (Helm)

# Add Bitnami repo
helm repo add bitnami https://charts.bitnami.com/bitnami

# Install Redis
helm install redis bitnami/redis \
  --set auth.password=your-password \
  --set replica.replicaCount=2

Verification Commands

# Test connection
redis-cli ping                    # Expected: PONG

# Check version
redis-cli INFO server | grep redis_version

# Test basic operations
redis-cli SET test:install "success"
redis-cli GET test:install
redis-cli DEL test:install

# Check config
redis-cli CONFIG GET dir
redis-cli CONFIG GET port

Initial Configuration

# /etc/redis/redis.conf - Production Basics

# Network
bind 127.0.0.1
port 6379
protected-mode yes

# Memory
maxmemory 256mb
maxmemory-policy allkeys-lru

# Persistence
appendonly yes
appendfsync everysec

# Security
requirepass your-strong-password

Assets

• docker-compose.yml - Production Docker setup
• redis.conf - Optimized configuration template

Scripts

• install-redis.sh - Cross-platform installation script
• verify-installation.sh - Health check script

References

• INSTALLATION_GUIDE.md - Detailed installation steps
• TROUBLESHOOTING.md - Common issues and solutions

---

Troubleshooting Guide

Common Issues & Solutions

1. Package Not Found

E: Unable to locate package redis-server

Fix:

# Ubuntu - add official repo
curl -fsSL https://packages.redis.io/gpg | sudo gpg --dearmor -o /usr/share/keyrings/redis-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/redis-archive-keyring.gpg] https://packages.redis.io/deb $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/redis.list
sudo apt update

2. Port Already in Use

Could not create server TCP listening socket: bind: Address already in use

Diagnosis:

# Check what's using port 6379
sudo lsof -i :6379
sudo netstat -tlnp | grep 6379

Fix:

# Kill existing process
sudo kill $(sudo lsof -t -i:6379)

# Or change port in redis.conf
port 6380

3. Permission Denied

Can't open the log file: Permission denied

Fix:

# Fix ownership
sudo chown -R redis:redis /var/lib/redis
sudo chown -R redis:redis /var/log/redis

# Fix permissions
sudo chmod 750 /var/lib/redis

4. Memory Overcommit Warning

# WARNING overcommit_memory is set to 0!

Fix:

# Temporary
echo 1 > /proc/sys/vm/overcommit_memory

# Permanent
echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
sysctl -p

Installation Verification Script

#!/bin/bash
# verify-redis-installation.sh

echo "=== Redis Installation Verification ==="

# Check if redis-server is running
echo -n "Redis server running: "
if pgrep -x "redis-server" > /dev/null; then
    echo "✓ YES"
else
    echo "✗ NO"
    exit 1
fi

# Check PING response
echo -n "Redis responds to PING: "
if redis-cli ping 2>/dev/null | grep -q "PONG"; then
    echo "✓ PONG"
else
    echo "✗ FAILED"
    exit 1
fi

# Check version
echo -n "Redis version: "
redis-cli INFO server 2>/dev/null | grep redis_version | cut -d: -f2

# Check persistence
echo -n "Persistence enabled: "
if redis-cli CONFIG GET appendonly 2>/dev/null | grep -q "yes"; then
    echo "✓ AOF"
else
    echo "RDB only or disabled"
fi

echo "=== Verification Complete ==="

Debug Checklist

□ Redis package installed?
□ Service started and enabled?
□ Correct port binding?
□ No port conflicts?
□ Correct file permissions?
□ Config file syntax valid?
□ Memory overcommit enabled?
□ Firewall allows connections?

---

Error Codes Reference

Code	Name	Description	Recovery
I001	PKG_NOT_FOUND	Package not available	Add official repo
I002	PORT_IN_USE	Port 6379 occupied	Kill process or change port
I003	PERMISSION	Access denied	Fix ownership/permissions
I004	CONFIG_INVALID	Bad config syntax	Check redis.conf
I005	SERVICE_FAIL	Service won't start	Check logs

---

Test Template

#!/bin/bash
# test-redis-installation.sh

set -e

echo "Running Redis installation tests..."

# Test 1: Server responds
test_ping() {
    result=$(redis-cli ping)
    [ "$result" = "PONG" ] && echo "PASS: ping" || { echo "FAIL: ping"; exit 1; }
}

# Test 2: Can write/read
test_write_read() {
    redis-cli SET test:key "value" > /dev/null
    result=$(redis-cli GET test:key)
    redis-cli DEL test:key > /dev/null
    [ "$result" = "value" ] && echo "PASS: write/read" || { echo "FAIL: write/read"; exit 1; }
}

# Test 3: Version check
test_version() {
    version=$(redis-cli INFO server | grep redis_version | cut -d: -f2 | tr -d '\r')
    [[ "$version" =~ ^[67]\. ]] && echo "PASS: version $version" || { echo "FAIL: version"; exit 1; }
}

test_ping
test_write_read
test_version

echo "All tests passed!"