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Linux TIME_WAIT 状态深度调优指南

  • 2026-02-05 13:18:20
Linux TIME_WAIT 状态深度调优指南
一、TIME_WAIT 状态原理与诊断
1.1 TIME_WAIT 状态监控脚本
#!/bin/bash
# timewait-monitor.sh

echo"=== TIME_WAIT 状态深度监控 $(date) ==="
echo""

# 1. 总体连接统计
echo"1. 📊 总体TCP连接统计:"
ss -s | head -5
echo""

# 2. TIME_WAIT 详细统计
echo"2. 🔍 TIME_WAIT 状态详细分析:"
timewait_total=$(ss -s | awk '/TIME-WAIT/ {print $4}')
echo"   TIME_WAIT 总数: $timewait_total"

# 按端口统计TOP10
echo -e "\n3. 📈 TIME_WAIT 端口分布 (TOP10):"
ss -tan state time-wait | awk '{print $5}' | awk -F: '{print $NF}' | sort | uniq -c | sort -nr | head -10
echo""

# 4. 连接持续时间分析
echo"4. ⏰ TIME_WAIT 连接持续时间分布:"
# 获取所有TIME_WAIT连接的计时器值
echo"   计时器值分布:"
ss -to state time-wait | grep timer | awk '{print $NF}' | sort | uniq -c | sort -nr | head -5
echo""

# 5. 内存使用分析
echo"5. 💾 内存使用情况:"
if [ -f /proc/slabinfo ]; then
    slab_info=$(awk '/tw_sock_TCP/ {print "   TW sockets: "$2" objects, "$3"KB"}' /proc/slabinfo)
if [ -n "$slab_info" ]; then
echo"$slab_info"
else
echo"   未找到tw_sock_TCP slab信息"
fi
fi
echo""

# 6. 端口使用率
echo"6. 🔢 端口使用率分析:"
ports_used=$(ss -tan | wc -l)
ports_range=$(sysctl -n net.ipv4.ip_local_port_range | awk '{print $2-$1+1}')
timewait_ports=$(ss -tan state time-wait | wc -l)
echo"   总连接数: $ports_used"
echo"   TIME_WAIT连接数: $timewait_ports"
echo"   可用端口范围: $ports_range"
echo"   TIME_WAIT占比: $(echo "scale=2; $timewait_ports*100/$ports_used" | bc)%"
echo""

# 7. 系统参数检查
echo"7. ⚙️  当前系统参数:"
echo"   tcp_max_tw_buckets: $(sysctl -n net.ipv4.tcp_max_tw_buckets)"
echo"   tcp_tw_reuse: $(sysctl -n net.ipv4.tcp_tw_reuse)"
echo"   tcp_tw_recycle: $(sysctl -n net.ipv4.tcp_tw_recycle)"
echo"   tcp_fin_timeout: $(sysctl -n net.ipv4.tcp_fin_timeout)"
echo"   ip_local_port_range: $(sysctl -n net.ipv4.ip_local_port_range)"
echo""

# 8. 性能影响评估
echo"8. 📊 性能影响评估:"
if [ $timewait_ports -gt 10000 ]; then
echo"   ⚠️  检测到大量TIME_WAIT连接,可能影响性能"
elif [ $timewait_ports -gt 50000 ]; then
echo"   ❗ TIME_WAIT连接过多,急需优化"
else
echo"   ✅ TIME_WAIT连接数量正常"
fi
1.2 实时TIME_WAIT监控
#!/bin/bash
# timewait-realtime.sh

INTERVAL=2
DURATION=600

echo"开始TIME_WAIT实时监控,间隔 ${INTERVAL}s,持续 ${DURATION}s..."
end=$((SECONDS+DURATION))

while [ $SECONDS -lt $end ]; do
    clear
echo"=== TIME_WAIT实时监控 $(date) ==="

# 获取连接统计
    total_conn=$(ss -s | awk '/TCP:/ {print $2}')
    timewait=$(ss -s | awk '/TIME-WAIT/ {print $4}')
    established=$(ss -s | awk '/ESTAB/ {print $4}')

# 计算百分比
if [ $total_conn -gt 0 ]; then
        timewait_pct=$(echo"scale=2; $timewait*100/$total_conn" | bc)
else
        timewait_pct=0
fi

echo"总连接: $total_conn, ESTABLISHED: $established, TIME_WAIT: $timewait ($timewait_pct%)"

# 端口使用情况
    ports_used=$(ss -tan | wc -l)
    ports_range=$(sysctl -n net.ipv4.ip_local_port_range | awk '{print $2-$1+1}')
    ports_pct=$(echo"scale=2; $ports_used*100/$ports_range" | bc)

echo"端口使用: $ports_used/$ports_range ($ports_pct%)"

# 检查端口耗尽风险
if (( $(echo"$ports_pct > 80" | bc -l) )); then
echo -e "⚠️  端口使用率过高!"
fi

# 显示TOP TIME_WAIT端口
echo"TOP TIME_WAIT端口:"
    ss -tan state time-wait | awk '{print $5}' | awk -F: '{print $NF}' | sort | uniq -c | sort -nr | head -3

    sleep $INTERVAL
done
二、内核参数调优
2.1 TIME_WAIT内核参数优化
#!/bin/bash
# optimize-timewait-kernel.sh

echo"=== TIME_WAIT内核参数深度优化 ==="

# 备份当前配置
BACKUP_DIR="/etc/backup/timewait_$(date +%Y%m%d_%H%M%S)"
mkdir -p $BACKUP_DIR
cp /etc/sysctl.conf $BACKUP_DIR/

echo"当前TIME_WAIT参数:"
echo"tcp_max_tw_buckets: $(sysctl -n net.ipv4.tcp_max_tw_buckets)"
echo"tcp_tw_reuse: $(sysctl -n net.ipv4.tcp_tw_reuse)"
echo"tcp_tw_recycle: $(sysctl -n net.ipv4.tcp_tw_recycle)"
echo"tcp_fin_timeout: $(sysctl -n net.ipv4.tcp_fin_timeout)"
echo""

# 应用优化参数
echo"应用TIME_WAIT优化参数..."
cat >> /etc/sysctl.conf << 'EOF'

# ================ TIME_WAIT 状态优化 ================

# 1. 增加TIME_WAIT桶数量(根据内存调整)
# 默认值: 180000
# 建议值: 根据系统内存调整,每连接约消耗1KB内存
net.ipv4.tcp_max_tw_buckets = 2000000

# 2. 启用TIME_WAIT连接重用
# 允许将TIME_WAIT连接用于新的出站连接
# 安全且推荐启用
net.ipv4.tcp_tw_reuse = 1

# 3. 禁用TIME_WAIT快速回收(NAT环境下必须禁用)
# 在NAT环境下启用会导致连接问题
# 建议保持禁用状态
net.ipv4.tcp_tw_recycle = 0

# 4. 减少FIN_WAIT_2超时时间
# 加速连接关闭过程
net.ipv4.tcp_fin_timeout = 30

# 5. 增加本地端口范围
# 提供更多可用端口,减少端口耗尽风险
net.ipv4.ip_local_port_range = 10000 65535

# 6. 优化连接关闭参数
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_keepalive_probes = 5

# 7. 减少SYN重试次数
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_synack_retries = 2

# 8. 启用TCP时间戳(有助于连接重用)
net.ipv4.tcp_timestamps = 1

# 9. 连接跟踪优化(如果使用防火墙)
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60
EOF

# 应用配置
sysctl -p

echo""
echo"优化后的参数:"
echo"tcp_max_tw_buckets: $(sysctl -n net.ipv4.tcp_max_tw_buckets)"
echo"tcp_tw_reuse: $(sysctl -n net.ipv4.tcp_tw_reuse)"
echo"tcp_tw_recycle: $(sysctl -n net.ipv4.tcp_tw_recycle)"
echo"tcp_fin_timeout: $(sysctl -n net.ipv4.tcp_fin_timeout)"
echo""

echo"TIME_WAIT内核参数优化完成!"
2.2 内存优化配置
#!/bin/bash
# optimize-timewait-memory.sh

echo"=== TIME_WAIT连接内存优化 ==="

# 计算系统内存和推荐配置
total_mem_kb=$(grep MemTotal /proc/meminfo | awk '{print $2}')
total_mem_mb=$((total_mem_kb / 1024))

echo"系统总内存: ${total_mem_mb}MB"

# 根据内存大小推荐配置
if [ $total_mem_mb -lt 4096 ]; then
# 小内存系统
    tw_buckets=180000
    tcp_mem="196608 262144 393216"
elif [ $total_mem_mb -lt 16384 ]; then
# 中等内存系统
    tw_buckets=360000
    tcp_mem="524288 699050 1048576"
else
# 大内存系统
    tw_buckets=2000000
    tcp_mem="786432 1048576 1572864"
fi

echo"推荐配置:"
echo"tcp_max_tw_buckets = $tw_buckets"
echo"tcp_mem = $tcp_mem"

# 应用内存优化配置
cat >> /etc/sysctl.conf << EOF

# 内存相关的TIME_WAIT优化
net.ipv4.tcp_max_tw_buckets = $tw_buckets
net.ipv4.tcp_mem = $tcp_mem

#  socket缓冲区优化
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.rmem_default = 16777216
net.core.wmem_default = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
EOF

# 应用配置
sysctl -p

echo"内存优化配置完成!"
三、应用程序级优化
3.1 连接池优化配置
#!/bin/bash
# optimize-connection-pool.sh

echo"=== 应用程序连接池优化 ==="

# 检测常见的应用服务并优化其连接池配置
SERVICES=("nginx""apache2""httpd""mysql""postgresql""redis""tomcat")

for service in"${SERVICES[@]}"do
if systemctl is-active --quiet $servicethen
echo"检测到运行的服务: $service"

case$servicein
            nginx|apache2|httpd)
                optimize_web_server $service
                ;;
            mysql)
                optimize_mysql
                ;;
            postgresql)
                optimize_postgresql
                ;;
            redis)
                optimize_redis
                ;;
            tomcat)
                optimize_tomcat
                ;;
esac
fi
done

optimize_web_server() {
local service=$1
echo"优化Web服务器 $service 连接池..."

# 对于Nginx
if [ "$service" = "nginx" ]; then
# 备份配置
        cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.backup.$(date +%Y%m%d)

# 优化keepalive配置
        sed -i '/keepalive_timeout/c\keepalive_timeout 30;' /etc/nginx/nginx.conf
        sed -i '/keepalive_requests/c\keepalive_requests 1000;' /etc/nginx/nginx.conf

# 优化worker连接数
        sed -i '/worker_connections/c\    worker_connections 50000;' /etc/nginx/nginx.conf

        systemctl reload nginx
echo"Nginx连接池优化完成"
fi
}

optimize_mysql() {
echo"优化MySQL连接池..."

# MySQL连接池配置优化
    MYSQL_CONF="/etc/mysql/my.cnf"
if [ -f $MYSQL_CONF ]; then
        cp $MYSQL_CONF$MYSQL_CONF.backup.$(date +%Y%m%d)

# 添加或修改连接池配置
if grep -q "\[mysqld\]"$MYSQL_CONFthen
            cat >> $MYSQL_CONF << 'EOF'

# 连接池优化
max_connections = 1000
max_connect_errors = 1000000
wait_timeout = 600
interactive_timeout = 600
EOF
fi

        systemctl restart mysql
echo"MySQL连接池优化完成"
fi
}

echo"应用程序连接池优化完成!"
3.2 客户端连接优化
#!/bin/bash
# optimize-client-connections.sh

echo"=== 客户端连接行为优化 ==="

# 创建连接优化建议文档
cat > /tmp/connection-optimization-guide.md << 'EOF'
# 客户端连接优化指南

## 1. HTTP客户端优化

### 1.1 使用连接池
```python
# Python requests
import requests
from requests.adapters import HTTPAdapter

session = requests.Session()
adapter = HTTPAdapter(pool_connections=100, pool_maxsize=100, max_retries=3)
session.mount('http://', adapter)
session.mount('https://', adapter)
// Java HttpClient
HttpClient client = HttpClient.newBuilder()
    .connectTimeout(Duration.ofSeconds(10))
    .version(HttpClient.Version.HTTP_2)
    .build();
1.2 合理设置超时
  • 连接超时: 5-10秒
  • 读取超时: 30-60秒
  • 保持连接: 启用HTTP Keep-Alive
2. 数据库连接优化
2.1 使用连接池
// HikariCP配置
HikariConfig config = new HikariConfig();
config.setMaximumPoolSize(20);
config.setMinimumIdle(5);
config.setIdleTimeout(300000);
config.setConnectionTimeout(10000);
2.2 连接生命周期管理
  • 及时关闭连接
  • 使用try-with-resources
  • 避免连接泄漏
3. TCP连接最佳实践
3.1 连接建立
  • 使用TCP_NODELAY禁用Nagle算法
  • 启用TCP_QUICKACK快速确认
  • 合理设置SO_LINGER
3.2 连接关闭
  • 优雅关闭连接(SHUT_WR -> SHUT_RD)
  • 避免强制关闭连接
  • 处理连接超时和重试
4. 监控和诊断
4.1 连接监控
# 监控TIME_WAIT连接
ss -tan state time-wait | wc -l

#
 监控端口使用
netstat -an | grep :80 | wc -l

#
 监控连接错误
dmesg | grep -i "drop"
4.2 能测试
使用工具测试连接池性能:
  • wrk
  • ab
  • siege
  • jmeter
EOF
echo "客户端连接优化指南已生成: /tmp/connection-optimization-guide.md"
echo "请根据应用程序类型参考相应的优化建议"
## 四、网络栈优化

### 4.1 网络接口和队列优化
```bash
#!/bin/bash
# optimize-network-stack.sh

echo"=== 网络栈深度优化 ==="

# 获取主要网络接口
INTERFACE=$(ip route | awk '/default/ {print $5}' | head -1)

if [ -z "$INTERFACE" ]; then
echo"未找到默认网络接口"
exit 1
fi

echo"优化网络接口: $INTERFACE"

# 1. 网络接口参数优化
echo"1. 优化网络接口参数..."
ethtool -G $INTERFACE rx 4096 tx 4096 2>/dev/null || echo"无法调整队列长度"
ethtool -K $INTERFACE gro on gso on tso on 2>/dev/null || echo"无法调整卸载功能"

# 2. 中断亲和性优化
echo"2. 优化中断亲和性..."
ifcommand -v irqbalance &>/dev/null; then
    systemctl enable irqbalance
    systemctl start irqbalance
else
echo"安装irqbalance: apt install irqbalance"
fi

# 3. RPS/RFS优化(多队列网卡)
echo"3. 配置RPS/RFS..."
if [ -d /sys/class/net/$INTERFACE/queues ]; then
#

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  1. CONNECT:[ UseTime:0.000626s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000308s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001381s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000633s ]
  6. SELECT * FROM `set` [ RunTime:0.000650s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000612s ]
  8. SELECT * FROM `article` WHERE `id` = 467895 LIMIT 1 [ RunTime:0.001982s ]
  9. UPDATE `article` SET `lasttime` = 1770496031 WHERE `id` = 467895 [ RunTime:0.005898s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.006740s ]
  11. SELECT * FROM `article` WHERE `id` < 467895 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006107s ]
  12. SELECT * FROM `article` WHERE `id` > 467895 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007254s ]
  13. SELECT * FROM `article` WHERE `id` < 467895 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.044977s ]
  14. SELECT * FROM `article` WHERE `id` < 467895 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.031303s ]
  15. SELECT * FROM `article` WHERE `id` < 467895 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020343s ]
0.198316s