Redis性能监控与优化脚本

#!/bin/bash # ========================================== # Redis性能监控与优化脚本 # 用途：监控Redis性能，分析内存和命中率，给出优化建议 # 使用方法：bash redis_perf_monitor.sh # ========================================== REDIS_HOST="${REDIS_HOST:-127.0.0.1}" REDIS_PORT="${REDIS_PORT:-6379}" REDIS_PASS="${REDIS_PASS:-}" echo "========== Redis性能监控报告 ==========" echo "监控时间: $(date '+%Y-%m-%d %H:%M:%S')" echo "目标: $REDIS_HOST:$REDIS_PORT" echo "" # 检查redis-cli if ! command -v redis-cli &> /dev/null; then echo "❌ 错误: redis-cli未安装" exit 1 fi # 构建redis-cli命令 REDIS_CMD="redis-cli -h $REDIS_HOST -p $REDIS_PORT" if [ -n "$REDIS_PASS" ]; then REDIS_CMD="$REDIS_CMD -a $REDIS_PASS --no-auth-warning" fi # 测试连接 if ! $REDIS_CMD ping &>/dev/null; then echo "❌ 错误: 无法连接Redis，请检查连接配置" exit 1 fi echo "✅ Redis连接成功" echo "" # 获取INFO信息 INFO=$($REDIS_CMD INFO all 2>/dev/null) get_info_value() { echo "$INFO" | grep "^$1:" | cut -d: -f2 | tr -d ' ' } # 1. 基本信息 echo "【1. 基本信息】" echo " Redis版本: $(get_info_value redis_version)" echo " 运行模式: $(get_info_value redis_mode)" echo " 操作系统: $(get_info_value os)" echo " 运行时间: $(get_info_value uptime_in_days) 天" echo " 进程ID: $(get_info_value process_id)" echo "" # 2. 内存使用 echo "【2. 内存使用分析】" USED_MEMORY=$(get_info_value used_memory) USED_MEMORY_HUMAN=$(get_info_value used_memory_human) USED_MEMORY_RSS=$(get_info_value used_memory_rss_human) USED_MEMORY_PEAK=$(get_info_value used_memory_peak_human) MAXMEMORY=$(get_info_value maxmemory) MAXMEMORY_POLICY=$(get_info_value maxmemory_policy) MEM_FRAGMENTATION_RATIO=$(get_info_value mem_fragmentation_ratio) echo " 已用内存: $USED_MEMORY_HUMAN" echo " RSS内存: $USED_MEMORY_RSS" echo " 内存峰值: $USED_MEMORY_PEAK" echo " 最大内存配置: $([ "$MAXMEMORY" = "0" ] && echo '未限制' || echo "$MAXMEMORY")" echo " 淘汰策略: $MAXMEMORY_POLICY" echo " 内存碎片率: $MEM_FRAGMENTATION_RATIO" if [ -n "$MEM_FRAGMENTATION_RATIO" ]; then if (( $(echo "$MEM_FRAGMENTATION_RATIO > 1.5" | bc -l) )); then echo " ⚠️ 内存碎片率过高(>1.5)，建议:" echo " - 执行 redis-cli --bigkeys 查找大key" echo " - 考虑重启Redis实例整理内存" echo " - 检查是否有大量过期key未清理" fi fi if [ "$MAXMEMORY" = "0" ]; then echo " ⚠️ 未配置maxmemory，建议设置最大内存限制" fi echo "" # 3. 键空间统计 echo "【3. 键空间统计】" KEYSPACE=$(get_info_value db0) if [ -n "$KEYSPACE" ]; then KEYS=$(echo "$KEYSPACE" | grep -oP 'keys=\K[0-9]+') EXPIRES=$(echo "$KEYSPACE" | grep -oP 'expires=\K[0-9]+') AVG_TTL=$(echo "$KEYSPACE" | grep -oP 'avg_ttl=\K[0-9]+') echo " 总键数: $KEYS" echo " 过期键数: $EXPIRES" echo " 平均TTL: $([ -n "$AVG_TTL" ] && echo "$((AVG_TTL/1000))秒" || echo 'N/A')" else echo " 数据库为空" fi # 大key检查提示 echo " 提示: 执行 redis-cli --bigkeys 可查找大key" echo "" # 4. 命中率分析 echo "【4. 缓存命中率分析】" KEYSPACE_HITS=$(get_info_value keyspace_hits) KEYSPACE_MISSES=$(get_info_value keyspace_misses) TOTAL_REQUESTS=$((KEYSPACE_HITS + KEYSPACE_MISSES)) if [ "$TOTAL_REQUESTS" -gt 0 ]; then HIT_RATE=$(echo "scale=2; $KEYSPACE_HITS * 100 / $TOTAL_REQUESTS" | bc) echo " 命中次数: $KEYSPACE_HITS" echo " 未命中次数: $KEYSPACE_MISSES" echo " 命中率: ${HIT_RATE}%" if (( $(echo "$HIT_RATE < 80" | bc -l) )); then echo " ⚠️ 命中率低于80%，建议:" echo " - 检查缓存策略是否合理" echo " - 增加缓存容量或调整淘汰策略" echo " - 优化查询，减少不必要的缓存未命中" else echo " ✅ 命中率良好" fi else echo " 无请求记录" fi echo "" # 5. 连接数分析 echo "【5. 连接数分析】" CONNECTED_CLIENTS=$(get_info_value connected_clients) MAX_CLIENTS=$(get_info_value maxclients) BLOCKED_CLIENTS=$(get_info_value blocked_clients) echo " 当前连接数: $CONNECTED_CLIENTS" echo " 最大连接数: $MAX_CLIENTS" echo " 阻塞连接数: $BLOCKED_CLIENTS" if [ -n "$MAX_CLIENTS" ] && [ "$MAX_CLIENTS" -gt 0 ]; then CONN_RATIO=$(echo "scale=1; $CONNECTED_CLIENTS * 100 / $MAX_CLIENTS" | bc) echo " 连接使用率: ${CONN_RATIO}%" if (( $(echo "$CONN_RATIO > 80" | bc -l) )); then echo " ⚠️ 连接数使用率超过80%，建议增大maxclients" fi fi echo "" # 6. 命令统计 echo "【6. 命令执行统计】" TOTAL_COMMANDS=$(get_info_value total_commands_processed) INSTANTANEOUS_OPS=$(get_info_value instantaneous_ops_per_sec) echo " 累计命令数: $TOTAL_COMMANDS" echo " 当前OPS: $INSTANTANEOUS_OPS" # Top命令 echo " Top 5命令:" $REDIS_CMD INFO commandstats 2>/dev/null | grep '^cmdstat_' | head -5 | while read line; do CMD=$(echo "$line" | cut -d: -f1 | sed 's/cmdstat_//') CALLS=$(echo "$line" | grep -oP 'calls=\K[0-9]+') USEC=$(echo "$line" | grep -oP 'usec=\K[0-9]+') if [ -n "$CALLS" ] && [ "$CALLS" -gt 0 ]; then AVG_USEC=$((USEC / CALLS)) echo " $CMD: 调用$CALLS次, 平均${AVG_USEC}微秒" fi done echo "" # 7. 持久化状态 echo "【7. 持久化状态】" RDB_LAST_SAVE=$(get_info_value rdb_last_save_time) RDB_CHANGES=$(get_info_value rdb_changes_since_last_save) AOF_ENABLED=$(get_info_value aof_enabled) echo " RDB最后保存: $(date -d @$RDB_LAST_SAVE '+%Y-%m-%d %H:%M:%S' 2>/dev/null || echo 'N/A')" echo " RDB未保存变更: $RDB_CHANGES" echo " AOF启用: $([ "$AOF_ENABLED" = "1" ] && echo '是' || echo '否')" if [ "$AOF_ENABLED" = "0" ]; then echo " ⚠️ AOF未启用，建议启用AOF持久化提高数据安全性" fi echo "" # 8. 慢查询 echo "【8. 慢查询日志】" SLOWLOG_LEN=$($REDIS_CMD SLOWLOG LEN 2>/dev/null) echo " 慢查询总数: $SLOWLOG_LEN" if [ "$SLOWLOG_LEN" -gt 0 ]; then echo " 最近5条慢查询:" $REDIS_CMD SLOWLOG GET 5 2>/dev/null | while read line; do echo " $line" done fi echo "" # 9. 优化建议汇总 echo "【9. 优化建议汇总】" echo " 1. 内存优化:" echo " - 设置maxmemory限制最大内存使用" echo " - 选择合适的淘汰策略(allkeys-lru推荐)" echo " - 定期执行 --bigkeys 查找大key" echo " 2. 性能优化:" echo " - 使用pipeline减少网络往返" echo " - 避免使用KEYS命令，改用SCAN" echo " - 大对象考虑拆分或压缩" echo " 3. 持久化优化:" echo " - 启用AOF持久化，appendfsync设为everysec" echo " - RDB和AOF同时使用，兼顾性能和安全" echo " 4. 高可用:" echo " - 配置主从复制" echo " - 使用Sentinel或Cluster实现高可用" echo " - 定期备份数据" echo "" echo "========== 监控完成 =========="

[{"name": "REDIS_HOST", "label": "Redis\u4e3b\u673a", "default": "127.0.0.1"}, {"name": "REDIS_PORT", "label": "Redis\u7aef\u53e3", "default": "6379"}, {"name": "REDIS_PASS", "label": "\u5bc6\u7801", "default": ""}]