00. 目录

01. 命令概述

nstat命令是一个简单的监视内核的SNMP计数器和网络接口状态的实用工具 。

02. 命令格式

格式：nstat [选项]
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03. 常用选项

-z	显示0计数器
-h	显示帮助信息
-V	显示指令版本信息
-r	清零历史统计
-n	不显示任何内容，仅更新历史
-a	显示计数器的绝对值
-s	不更新历史
-d	以守护进程的方式运行本指令
-j	以json格式打印结果
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04. 参考示例

4.1 查询内核的SNMP计数器和网络接口状态

[root@localhost ~]# nstat 
#kernel
IpInReceives                    773                0.0
IpInDelivers                    773                0.0
IpOutRequests                   145                0.0
TcpInSegs                       203                0.0
TcpOutSegs                      146                0.0
UdpInDatagrams                  295                0.0
UdpOutDatagrams                 2                  0.0
Ip6InReceives                   1                  0.0
Ip6InDelivers                   1                  0.0
Ip6InMcastPkts                  1                  0.0
Ip6InOctets                     72                 0.0
Ip6InMcastOctets                72                 0.0
Ip6InNoECTPkts                  1                  0.0
Icmp6InMsgs                     1                  0.0
Icmp6InNeighborAdvertisements   1                  0.0
Icmp6InType136                  1                  0.0
TcpExtDelayedACKs               1                  0.0
TcpExtTCPHPHits                 68                 0.0
TcpExtTCPPureAcks               46                 0.0
TcpExtTCPHPAcks                 56                 0.0
TcpExtTCPAutoCorking            4                  0.0
TcpExtTCPOrigDataSent           137                0.0
IpExtInMcastPkts                290                0.0
IpExtOutMcastPkts               1                  0.0
IpExtInBcastPkts                280                0.0
IpExtInOctets                   75274              0.0
IpExtOutOctets                  31223              0.0
IpExtInMcastOctets              22608              0.0
IpExtOutMcastOctets             67                 0.0
IpExtInBcastOctets              33258              0.0
IpExtInNoECTPkts                773                0.0
[root@localhost ~]# 
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4.2 以json格式打印结果

[root@localhost ~]# nstat -j
{"kernel":{"IpInReceives":47,"IpInDelivers":47,"IpOutRequests":9,"TcpInSegs":15,"TcpOutSegs":10,"UdpInDatagrams":24,"TcpExtTCPHPHits":3,"TcpExtTCPPureAcks":4,"TcpExtTCPHPAcks":4,"TcpExtTCPAutoCorking":1,"TcpExtTCPOrigDataSent":10,"IpExtInMcastPkts":23,"IpExtInBcastPkts":9,"IpExtInOctets":4396,"IpExtOutOctets":2984,"IpExtInMcastOctets":1368,"IpExtInBcastOctets":1704,"IpExtInNoECTPkts":47}}
[root@localhost ~]# 
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4.3 不更新历史

[root@localhost ~]# nstat -s
nstat: history is stale, ignoring it.
#12240.1804289383 sampling_interval=2 time_const=60
IpInReceives                    879168             1.5
IpInDelivers                    879113             1.5
IpOutRequests                   3269               0.3
IpOutNoRoutes                   16                 0.0
IcmpInMsgs                      65                 0.0
IcmpInRedirects                 65                 0.0
IcmpOutMsgs                     11                 0.0
IcmpOutDestUnreachs             11                 0.0
IcmpMsgInType5                  65                 0.0
IcmpMsgOutType3                 11                 0.0
TcpActiveOpens                  8                  0.0
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4.4 显示计数器的绝对值

[root@localhost ~]# nstat  -a
nstat: history is stale, ignoring it.
#12240.1804289383 sampling_interval=2 time_const=60
IpInReceives                    879208             1.4
IpInDelivers                    879153             1.4
IpOutRequests                   3281               0.4
IpOutNoRoutes                   16                 0.0
IcmpInMsgs                      65                 0.0
IcmpInRedirects                 65                 0.0
IcmpOutMsgs                     11                 0.0
IcmpOutDestUnreachs             11                 0.0
IcmpMsgInType5                  65                 0.0
IcmpMsgOutType3                 11                 0.0
TcpActiveOpens                  8                  0.0
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4.5 清零历史统计

[root@localhost ~]# nstat -r
#12240.1804289383 sampling_interval=2 time_const=60
IpInReceives                    879249             1.0
IpInDelivers                    879194             1.0
IpOutRequests                   3289               0.1
IpOutNoRoutes                   16                 0.0
IcmpInMsgs                      65                 0.0
IcmpInRedirects                 65                 0.0
IcmpOutMsgs                     11                 0.0
IcmpOutDestUnreachs             11                 0.0
IcmpMsgInType5                  65                 0.0
IcmpMsgOutType3                 11                 0.0
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05. 附录

参考：【Linux】一步一步学Linux系列教程汇总