zabbix加入TCP连接数及状态的监控
一 监控原理：
[root@ nginx]# /bin/netstat -an|awk '/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}'
TIME_WAIT
FIN_WAIT2
ESTABLISHED
LISTEN
可以使用man netstat查看TCP的各种状态信息描述
ESTABLISHED socket已经建立连接
CLOSED socket没有被使用，无连接
CLOSING 服务器端和客户端都同时关闭连接
CLOSE_WAIT 等待关闭连接
TIME_WAIT 表示收到了对方的FIN报文，并发送出了ACK报文，等待2MSL后就可回到CLOSED状态
LAST_ACK 远端关闭，当前socket被动关闭后发送FIN报文，等待对方ACK报文
LISTEN 监听状态
SYN_RECV 接收到SYN报文
SYN_SENT 已经发送SYN报文
FIN_WAIT1 The socket is closed, and the connection is shutting down
FIN_WAIT2 Connection is closed, and the socket is waiting for a shutdown from the remote end.
二 监控脚本：
tcp_conn_status.sh，放在zabbix-agent的应用服务器上/usr/local/zabbix/bin/tcp_conn_status.sh
#!/bin/bash
#this script is used to get tcp and udp connetion status
#tcp status
metric=$
tmp_file=/tmp/tcp_status.txt
/bin/netstat -an|awk '/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}' > $tmp_file case $metric in
closed)
output=$(awk '/CLOSED/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
listen)
output=$(awk '/LISTEN/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
synrecv)
output=$(awk '/SYN_RECV/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
synsent)
output=$(awk '/SYN_SENT/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
established)
output=$(awk '/ESTABLISHED/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
timewait)
output=$(awk '/TIME_WAIT/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
closing)
output=$(awk '/CLOSING/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
closewait)
output=$(awk '/CLOSE_WAIT/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
lastack)
output=$(awk '/LAST_ACK/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
finwait1)
output=$(awk '/FIN_WAIT1/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
finwait2)
output=$(awk '/FIN_WAIT2/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo
else
echo $output
fi
;;
*)
echo -e "\e[033mUsage: sh $0 [closed|closing|closewait|synrecv|synsent|finwait1|finwait2|listen|established|lastack|timewait]\e[0m" esac
三 zabbix-agent配置
1、修改tcp_conn_status.sh文件权限：
chmod o+x /usr/local/zabbix/bin/tcp_conn_status.sh
2、在/usr/local/zabbix/etc目录下，创建文件tcp-status-params.conf
vi /usr/local/zabbix/etc/tcp-status-params.conf
3、在tcp-status-params.conf加入以下内容：
UserParameter=tcp.status[*],/usr/local/zabbix/bin/tcp_conn_status.sh $1
4、创建日志文件
# vi /tmp/tcp_status.txt
# chown zabbix:zabbix tcp_status.txt
# chmod tcp_status.txt
5、在/usr/local/zabbix/etc/zabbix_agentd.conf加入以下配置：
UserParameter=tcp.status[*],/usr/local/zabbix/bin/tcp_conn_status.sh $
四 重启zabbix-agent服务
/etc/init.d/zabbix_agentd restart
五 添加监控模板
<?xml version="1.0" encoding="UTF-8"?>
<zabbix_export>
<version>2.0</version>
<date>--04T09::57Z</date>
<groups>
<group>
<name>Templates</name>
</group>
</groups>
<templates>
<template>
<template>Template TCP Connection Status</template>
<name>Template TCP Connection Status</name>
<groups>
<group>
<name>Templates</name>
</group>
</groups>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<items>
<item>
<name>CLOSED</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[closed]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>CLOSE_WAIT</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[closewait]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>CLOSING</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[closing]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>ESTABLISHED</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[established]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>FIN_WAIT1</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[finwait1]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>FIN_WAIT2</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[finwait2]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>LAST_ACK</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[lastack]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>LISTEN</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[listen]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>SYN_RECV</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[synrecv]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>SYN_SENT</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[synsent]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
<item>
<name>TIME_WAIT</name>
<type></type>
<snmp_community/>
<multiplier></multiplier>
<snmp_oid/>
<key>tcp.status[timewait]</key>
<delay></delay>
<history></history>
<trends></trends>
<status></status>
<value_type></value_type>
<allowed_hosts/>
<units/>
<delta></delta>
<snmpv3_contextname/>
<snmpv3_securityname/>
<snmpv3_securitylevel></snmpv3_securitylevel>
<snmpv3_authprotocol></snmpv3_authprotocol>
<snmpv3_authpassphrase/>
<snmpv3_privprotocol></snmpv3_privprotocol>
<snmpv3_privpassphrase/>
<formula></formula>
<delay_flex/>
<params/>
<ipmi_sensor/>
<data_type></data_type>
<authtype></authtype>
<username/>
<password/>
<publickey/>
<privatekey/>
<port/>
<description/>
<inventory_link></inventory_link>
<applications>
<application>
<name>TCP Status</name>
</application>
</applications>
<valuemap/>
</item>
</items>
<discovery_rules/>
<macros/>
<templates/>
<screens/>
</template>
</templates>
<triggers>
<trigger>
<expression>{Template TCP Connection Status:tcp.status[timewait].last()}></expression>
<name>There are too many TCP TIME_WAIT status</name>
<url/>
<status></status>
<priority></priority>
<description/>
<type></type>
<dependencies/>
</trigger>
</triggers>
<graphs>
<graph>
<name>TCP Status</name>
<width></width>
<height></height>
<yaxismin>0.0000</yaxismin>
<yaxismax>100.0000</yaxismax>
<show_work_period></show_work_period>
<show_triggers></show_triggers>
<type></type>
<show_legend></show_legend>
<show_3d></show_3d>
<percent_left>0.0000</percent_left>
<percent_right>0.0000</percent_right>
<ymin_type_1></ymin_type_1>
<ymax_type_1></ymax_type_1>
<ymin_item_1></ymin_item_1>
<ymax_item_1></ymax_item_1>
<graph_items>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color>C80000</color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[closed]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color>00C800</color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[closewait]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color>0000C8</color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[closing]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color>C800C8</color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[established]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color>00C8C8</color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[finwait1]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color>C8C800</color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[finwait2]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color>C8C8C8</color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[lastack]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color></color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[listen]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color></color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[synrecv]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color></color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[synsent]</key>
</item>
</graph_item>
<graph_item>
<sortorder></sortorder>
<drawtype></drawtype>
<color></color>
<yaxisside></yaxisside>
<calc_fnc></calc_fnc>
<type></type>
<item>
<host>Template TCP Connection Status</host>
<key>tcp.status[timewait]</key>
</item>
</graph_item>
</graph_items>
</graph>
</graphs>
</zabbix_export>
zabbix加入TCP连接数及状态的监控的更多相关文章
- zabbix系列(七)zabbix3.0添加对tcp连接数及状态的监控
原理: netstat -an|awk '/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}' TIME_WAIT 79 ESTABLISHED 6 LISTE ...
- 使用ss命令对tcp连接数和状态的监控性能优化
之前对tcp的监控采用netstat命令,发现在服务器繁忙的时候效果不理想,这个命令占用大量的cpu有时候高达90%以上,可能会导致业务的不稳定,所以改用ss命令对脚本进行优化 对tcp连接数和状态的 ...
- zabbix3.0对tcp连接数和状态的监控优化
zabbix3.0对tcp连接数及状态的监控优化 之前对tcp的监控采用netstat命令,发现在服务器繁忙的时候效果不理想,这个命令占用大量的cpu有时候高达90%以上,可能会导致业务的不稳定,所以 ...
- zabbix3.0使用ss命令对tcp连接数和状态的监控性能优化
zabbix3.0对tcp连接数及状态的监控优化 之前对tcp的监控采用netstat命令,发现在服务器繁忙的时候效果不理想,这个命令占用大量的cpu有时候高达90%以上,可能会导致业务的不稳定,所以 ...
- Linux下查看tcp连接数及状态
netstat -n | awk ‘/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}’ TIME_WAIT 8947FIN_WAIT1 15FIN_W ...
- zabbix 监控 tcp 连接数
一.zabbix-agent 服务器配置 1.编辑zabbix_agent配置文件,添加以下内容 vim /etc/zabbix/zabbix_agentd.conf ##添加此行 UserParam ...
- zabbix经常报警elasticsearch节点TCP连接数过高问题
单服务器最大tcp连接数及调优汇总 单机最大tcp连接数 网络编程 在tcp应用中,server事先在某个固定端口监听,client主动发起连接,经过三路握手后建立tcp连接.那么对单机,其最大并发t ...
- 服务器最大TCP连接数及调优汇总
启动线程数: 启动线程数=[任务执行时间/(任务执行时间-IO等待时间)]*CPU内核数 最佳启动线程数和CPU内核数量成正比,和IO阻塞时间成反比.如果任务都是CPU计算型任务,那么线程数最多不超过 ...
- 单服务器最大tcp连接数及调优汇总
启动线程数: 启动线程数=[任务执行时间/(任务执行时间-IO等待时间)]*CPU内核数 最佳启动线程数和CPU内核数量成正比,和IO阻塞时间成反比.如果任务都是CPU计算型任务,那么线程数最多不超过 ...
随机推荐
- mongoDB之监控工具mongostat
mongostat是mongdb自带的状态检测工具,在命令行下使用.它会间隔固定时间获取mongodb的当前运行状态,并输出.如果你发现数据库突然变慢或者有其他问题的话,你第一手的操作就考虑采用mon ...
- node学习笔记9——cookie,session相关操作
下面讲的都是基Express及相关的包.所以在实践本篇文章之前,通过npm安装好Express, cookie-parser, cookie-session这三个安装包. 先简单说一下,如何用Expr ...
- r语言 load Rdata 获取表名 并直接转为数据表
首先指定 load结果为一个对象 然后此对象的值 即为 str的 数据表名 然后使用 eval(parse(text = l)) 两个函数 将字符串 转可执行对象 即可完成重新赋值 > l & ...
- MAC配置Xcode的Cocos2d-x环境
Version:0.9 StartHTML:-1 EndHTML:-1 StartFragment:00000099 EndFragment:00003988 1.Mac配置环境变量,即编辑命令: o ...
- 【转】IntelliJ IDEA 创建 hello world Java web Maven项目
学Java的大部分吧都是要整Java web开发项目的,那么最好用的编辑器估计就是这个 IntelliJ IDEA,然后现在maven管理项目是很流行的.然后我就示范一下,如何使用这个IntelliJ ...
- 为什么要有handler机制？handler机制的原理
为什么要有handler机制? 在Android的UI开发中,我们经常会使用Handler来控制主UI程序的界面变化.有关Handler的作用,我们总结为:与其他线程协同工作,接收其他线程的消息并通过 ...
- JDBC存储过程调用
在讨论JDBC Statement教程文章时,我们已经学习了如何在JDBC中使用存储过程. 本教程文章与该部分类似,但它将讲解演示有关JDBC SQL转义语法的其他信息. 就像Connection对象 ...
- nodejs基础 -- 路由
我们要为路由提供请求的URL和其他需要的GET/POST参数,随后路由需要根据这些数据(URL.GET/POST参数)来执行相应的代码. 因此,需要查看HTTP请求,从中提取出请求的URL及GET/P ...
- python模块之 - subprocess执行unix/linux命令
subprocess模块提供了一种一致的方法来创建和处理附加进程,与标准库中的其它模块相比,提供了一个更高级的接口,subprocess模块用来生成子进程,并可以通过管道连接它们的输入/输出/错误,以 ...
- C# 线程安全与 lock锁
如果你的代码所在的进程中有多个线程在同时运行,而这些线程可能会同时运行这段代码.如果每次运行结果和单线程运行的结果是一样的,而且其他的变量的值也和预期的是一样的,就是线程安全的. 或者说:一个类或者 ...