[root@fgedu101 ~]# cat > /memcached/app/scripts/memcached_monitor.sh << 'EOF'
> #!/bin/bash
> # memcached_monitor.sh
> # from:www.itpux.com.qq113257174.wx:itpux-com
> # web: http://www.fgedu.net.cn
>
> HOST=”192.168.1.101″
> PORT=”11211″
> LOG_FILE=”/memcached/app/logs/monitor.log”
> ALERT_LOG=”/memcached/app/logs/alert.log”
>
> # 获取统计数据
> STATS=$(echo “stats” | nc $HOST $PORT)
>
> # 解析关键指标
> BYTES=$(echo “$STATS” | grep “^STAT bytes ” | awk ‘{print $3}’)
> LIMIT=$(echo “$STATS” | grep “limit_maxbytes” | awk ‘{print $3}’)
> CURR_CONN=$(echo “$STATS” | grep “curr_connections” | awk ‘{print $3}’)
> MAX_CONN=$(echo “$STATS” | grep “max_connections” | awk ‘{print $3}’)
> GET_HITS=$(echo “$STATS” | grep “get_hits” | awk ‘{print $3}’)
> GET_MISSES=$(echo “$STATS” | grep “get_misses” | awk ‘{print $3}’)
> CMD_GET=$(echo “$STATS” | grep “cmd_get” | awk ‘{print $3}’)
> CMD_SET=$(echo “$STATS” | grep “cmd_set” | awk ‘{print $3}’)
> EVICTIONS=$(echo “$STATS” | grep “evictions” | awk ‘{print $3}’)
> CURR_ITEMS=$(echo “$STATS” | grep “curr_items” | awk ‘{print $3}’)
> UPTIME=$(echo “$STATS” | grep “uptime” | awk ‘{print $3}’)
>
> # 计算指标
> MEMORY_USAGE=$((BYTES * 100 / LIMIT))
> CONN_USAGE=$((CURR_CONN * 100 / MAX_CONN))
> TOTAL_GETS=$((GET_HITS + GET_MISSES))
> if [ $TOTAL_GETS -gt 0 ]; then
> HIT_RATE=$((GET_HITS * 100 / TOTAL_GETS))
> else
> HIT_RATE=0
> fi
>
> if [ $UPTIME -gt 0 ]; then
> QPS=$(( (CMD_GET + CMD_SET) / UPTIME ))
> else
> QPS=0
> fi
>
> # 记录监控数据
> TIMESTAMP=$(date ‘+%Y-%m-%d %H:%M:%S’)
> echo “$TIMESTAMP,MEMORY=$MEMORY_USAGE,HITRATE=$HIT_RATE,CONN=$CONN_USAGE,QPS=$QPS,ITEMS=$CURR_ITEMS,EVICTIONS=$EVICTIONS” >> $LOG_FILE
>
> # 告警判断
> ALERT_MSG=””
>
> if [ $MEMORY_USAGE -gt 90 ]; then
> ALERT_MSG=”[严重] 内存使用率: ${MEMORY_USAGE}%”
> elif [ $MEMORY_USAGE -gt 80 ]; then
> ALERT_MSG=”[警告] 内存使用率: ${MEMORY_USAGE}%”
> fi
>
> if [ $HIT_RATE -lt 70 ]; then
> ALERT_MSG=”$ALERT_MSG [严重] 命中率: ${HIT_RATE}%”
> elif [ $HIT_RATE -lt 85 ]; then
> ALERT_MSG=”$ALERT_MSG [警告] 命中率: ${HIT_RATE}%”
> fi
>
> if [ $CONN_USAGE -gt 95 ]; then
> ALERT_MSG=”$ALERT_MSG [严重] 连接使用率: ${CONN_USAGE}%”
> elif [ $CONN_USAGE -gt 80 ]; then
> ALERT_MSG=”$ALERT_MSG [警告] 连接使用率: ${CONN_USAGE}%”
> fi
>
> # 发送告警
> if [ -n “$ALERT_MSG” ]; then
> echo “[$TIMESTAMP] $ALERT_MSG” >> $ALERT_LOG
> echo “$ALERT_MSG”
> fi
>
> # 输出监控数据
> echo “===== Memcached监控报告 =====”
> echo “时间: $TIMESTAMP”
> echo “内存使用率: ${MEMORY_USAGE}%”
> echo “缓存命中率: ${HIT_RATE}%”
> echo “连接使用率: ${CONN_USAGE}%”
> echo “当前QPS: $QPS”
> echo “Key数量: $CURR_ITEMS”
> echo “Eviction次数: $EVICTIONS”
> EOF

[root@fgedu101 ~]# chmod +x /memcached/app/scripts/memcached_monitor.sh

3.2 Memcached监控脚本开发

执行监控脚本，验证监控功能。学习交流加群风哥QQ113257174。