Redis连接被拒绝(Connection refused)问题的完整解决指南

Could not connect to Redis at 192.168.1.48:6379: Connection refused

# 检查Redis服务状态
systemctl status redis

# 检查Redis是否安装
redis-server --version
redis-cli --version
which redis-server

# 检查Redis进程
ps aux | grep redis
pgrep -lf redis

# 检查端口监听状态
netstat -tlnp | grep 6379
ss -tlnp | grep 6379

# 本地连接测试
redis-cli ping

# 远程连接测试
redis-cli -h 目标IP ping

# Ubuntu/Debian
sudo apt update && sudo apt install redis-server

# CentOS/RHEL
sudo yum install redis
# 或
sudo dnf install redis

# 临时启动Redis
redis-server --daemonize yes

# 或使用配置文件启动
redis-server /etc/redis/redis.conf

# 创建系统服务（推荐）
sudo systemctl enable redis
sudo systemctl start redis

# 允许远程连接
bind 0.0.0.0

# 关闭保护模式（测试环境）
protected-mode no

# 设置密码（可选）
requirepass yourpassword

# 后台运行
daemonize yes

sudo systemctl restart redis
# 或
pkill redis-server && redis-server /etc/redis/redis.conf

# 检查防火墙状态
sudo ufw status
sudo iptables -L

# 开放Redis端口
sudo ufw allow 6379
# 或
sudo iptables -A INPUT -p tcp --dport 6379 -j ACCEPT

# 永久保存iptables规则
sudo service iptables save  # CentOS
# 或安装iptables-persistent (Ubuntu/Debian)

sudo cat > /etc/systemd/system/redis.service << EOF
[Unit]
Description=Redis In-Memory Data Store
After=network.target

[Service]
Type=forking
ExecStart=/usr/bin/redis-server /etc/redis/redis.conf
ExecStop=/usr/bin/redis-cli shutdown
Restart=always
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755

[Install]
WantedBy=multi-user.target
EOF

sudo systemctl daemon-reload
sudo systemctl enable redis
sudo systemctl start redis

# 查看系统日志
sudo journalctl -u redis

# 或查看Redis日志文件
sudo tail -f /var/log/redis/redis-server.log

# 检查内存
free -h

# 检查磁盘空间
df -h

# 检查文件描述符限制
ulimit -n

# 测试端口连通性
telnet 目标IP 6379
nc -zv 目标IP 6379

# 检查端口占用
sudo lsof -i :6379

# 检查配置文件语法
redis-check-rdb /etc/redis/redis.conf

# 测试配置
redis-server /etc/redis/redis.conf --test

# 在redis.conf中设置
requirepass 强密码
rename-command FLUSHALL ""
rename-command CONFIG ""
bind 指定IP地址
port 自定义端口

# 使用防火墙限制访问IP
sudo ufw allow from 信任IP to any port 6379

# 或使用iptables
sudo iptables -A INPUT -p tcp -s 信任IP --dport 6379 -j ACCEPT

#!/bin/bash
REDIS_HOST="localhost"
REDIS_PORT="6379"

if redis-cli -h $REDIS_HOST -p $REDIS_PORT ping | grep -q "PONG"; then
    echo "Redis is running"
    exit 0
else
    echo "Redis is down"
    # 尝试重启
    sudo systemctl restart redis
    exit 1
fi