原理：
netstat -an|awk '/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}'
TIME_WAIT 79
ESTABLISHED 6
LISTEN 3
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.
2.在需要被监控的zabbix-agent端添加脚本编写
创建文件夹
mkdir -p /usr/local/zabbix-agent/scripts/
mkdir -p /etc/zabbix/zabbix_agentd.d/
vim /usr/local/zabbix-agent/scripts/tcp_conn_status.sh
#!/bin/bash
#this script is used to get tcp and udp connetion status
#tcp status
metric=$1
tmp_file=/tmp/tcp_status.txt
/bin/netstat -an|awk '/^tcp/{++S[$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 0
else
echo $output
fi
;;
listen)
output=$(awk '/LISTEN/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
synrecv)
output=$(awk '/SYN_RECV/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
synsent)
output=$(awk '/SYN_SENT/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
established)
output=$(awk '/ESTABLISHED/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
timewait)
output=$(awk '/TIME_WAIT/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
closing)
output=$(awk '/CLOSING/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
closewait)
output=$(awk '/CLOSE_WAIT/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
lastack)
output=$(awk '/LAST_ACK/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
finwait1)
output=$(awk '/FIN_WAIT1/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
finwait2)
output=$(awk '/FIN_WAIT2/{print $2}' $tmp_file)
if [ "$output" == "" ];then
echo 0
else
echo $output
fi
;;
*)
echo -e "\e[033mUsage: sh $0 [closed|closing|closewait|synrecv|synsent|finwait1|finwait2|listen|established|lastack|timewait]\e[0m"
esac
赋予脚本执行权限
chmod o+x /usr/local/zabbix-agent/scripts/tcp_conn_status.sh
3.agent的配置文件 /etc/zabbix/zabbix_agentd.conf 中定义了其他key的包含目录 Include=/etc/zabbix/zabbix_agentd.d/, 接着在 /etc/zabbix/zabbix_agentd.d/ 目录新建一个文件 tcp-status-params.conf, 内容如下
vim /etc/zabbix/zabbix_agentd.d/tcp-status-params.conf
UserParameter=tcp.status[*],/usr/local/zabbix-agent/scripts/tcp_conn_status.sh $1
重启agent
service zabbix-agent restart
4.zabbix-master服务端测试
zabbix_get -s 192.168.3.86 -p 10050 -k "tcp.status[listen]"
13
5.zabbix web端配置：
登录Zabbix3.0 的web界面，一次选择 Configuration > Templates ， 在主界面的右上角有个 Import 按钮，用来导入模板
zabbix-tcp-status.xml
<?xml version="1.0" encoding="UTF-8"?> <zabbix_export> <version>2.0</version> <date>2014-12-04T09:41:57Z</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>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[closed]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>CLOSE_WAIT</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[closewait]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>CLOSING</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[closing]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>ESTABLISHED</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[established]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>FIN_WAIT1</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[finwait1]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>FIN_WAIT2</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[finwait2]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>LAST_ACK</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[lastack]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>LISTEN</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[listen]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>SYN_RECV</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[synrecv]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>SYN_SENT</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[synsent]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</inventory_link> <applications> <application> <name>TCP Status</name> </application> </applications> <valuemap/> </item> <item> <name>TIME_WAIT</name> <type>0</type> <snmp_community/> <multiplier>0</multiplier> <snmp_oid/> <key>tcp.status[timewait]</key> <delay>60</delay> <history>90</history> <trends>365</trends> <status>0</status> <value_type>3</value_type> <allowed_hosts/> <units/> <delta>0</delta> <snmpv3_contextname/> <snmpv3_securityname/> <snmpv3_securitylevel>0</snmpv3_securitylevel> <snmpv3_authprotocol>0</snmpv3_authprotocol> <snmpv3_authpassphrase/> <snmpv3_privprotocol>0</snmpv3_privprotocol> <snmpv3_privpassphrase/> <formula>1</formula> <delay_flex/> <params/> <ipmi_sensor/> <data_type>0</data_type> <authtype>0</authtype> <username/> <password/> <publickey/> <privatekey/> <port/> <description/> <inventory_link>0</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()}>10000</expression> <name>There are too many TCP TIME_WAIT status</name> <url/> <status>0</status> <priority>4</priority> <description/> <type>0</type> <dependencies/> </trigger> </triggers> <graphs> <graph> <name>TCP Status</name> <width>900</width> <height>200</height> <yaxismin>0.0000</yaxismin> <yaxismax>100.0000</yaxismax> <show_work_period>1</show_work_period> <show_triggers>1</show_triggers> <type>0</type> <show_legend>1</show_legend> <show_3d>0</show_3d> <percent_left>0.0000</percent_left> <percent_right>0.0000</percent_right> <ymin_type_1>0</ymin_type_1> <ymax_type_1>0</ymax_type_1> <ymin_item_1>0</ymin_item_1> <ymax_item_1>0</ymax_item_1> <graph_items> <graph_item> <sortorder>0</sortorder> <drawtype>0</drawtype> <color>C80000</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[closed]</key> </item> </graph_item> <graph_item> <sortorder>1</sortorder> <drawtype>0</drawtype> <color>00C800</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[closewait]</key> </item> </graph_item> <graph_item> <sortorder>2</sortorder> <drawtype>0</drawtype> <color>0000C8</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[closing]</key> </item> </graph_item> <graph_item> <sortorder>3</sortorder> <drawtype>0</drawtype> <color>C800C8</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[established]</key> </item> </graph_item> <graph_item> <sortorder>4</sortorder> <drawtype>0</drawtype> <color>00C8C8</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[finwait1]</key> </item> </graph_item> <graph_item> <sortorder>5</sortorder> <drawtype>0</drawtype> <color>C8C800</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[finwait2]</key> </item> </graph_item> <graph_item> <sortorder>6</sortorder> <drawtype>0</drawtype> <color>C8C8C8</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[lastack]</key> </item> </graph_item> <graph_item> <sortorder>7</sortorder> <drawtype>0</drawtype> <color>960000</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[listen]</key> </item> </graph_item> <graph_item> <sortorder>8</sortorder> <drawtype>0</drawtype> <color>009600</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[synrecv]</key> </item> </graph_item> <graph_item> <sortorder>9</sortorder> <drawtype>0</drawtype> <color>000096</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[synsent]</key> </item> </graph_item> <graph_item> <sortorder>10</sortorder> <drawtype>0</drawtype> <color>960096</color> <yaxisside>0</yaxisside> <calc_fnc>2</calc_fnc> <type>0</type> <item> <host>Template TCP Connection Status</host> <key>tcp.status[timewait]</key> </item> </graph_item> </graph_items> </graph> </graphs> </zabbix_export>
在对应主机上添加tcp的监控：
添加报警，当tcp连接数超过5W报警：
{Template TCP Connection Status:tcp.status[established].last()}>50000
最终效果图：
后记：发现通过netstat监控服务器的tcp等连接数效率比较低，netstat统计占用大量cpu带来服务器额外的压力，通过ss命令会更加合适，详情请看：