connections
check_connections
Checks the number of tcp connections.
Implementation
| Windows | Linux | FreeBSD | MacOSX |
|---|---|---|---|
| ✅ | ✅ | ✅ |
Examples
Default Check
check_connections
OK - total connections 60
Check only ipv6 connections:
check_connections inet=ipv6
OK - total ipv6 connections 13
Example using NRPE and Naemon
Naemon Config
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -n -c $ARG1$ -a $ARG2$
}
define service {
host_name testhost
service_description check_connections
use generic-service
check_command check_nrpe!check_connections!'warn=total > 500' 'crit=total > 1500'
}
Argument Defaults
| Argument | Default Value |
|---|---|
| filter | inet=total |
| warning | total > 1000 |
| critical | total > 2000 |
| empty-state | 0 (OK) |
| empty-syntax | |
| top-syntax | %(status) - ${list} |
| ok-syntax | |
| detail-syntax | total ${prefix}connections: ${total} |
Check Specific Arguments
| Argument | Description |
|---|---|
| inet | Use specific address family only. Can be: total, any, ipv4 or ipv6 |
Attributes
Filter Keywords
these can be used in filters and thresholds (along with the default attributes):
| Attribute | Description |
|---|---|
| inet | address family, can be total (sum of any), all (any+total), any (v4+v6), inet4 or inet6 |
| prefix | address family as prefix, will be empty, inet4 or inet6 |
| total | total number of connections |
| established | total number of connections of type: established |
| syn_sent | total number of connections of type: syn_sent |
| syn_recv | total number of connections of type: syn_recv |
| fin_wait1 | total number of connections of type: fin_wait1 |
| fin_wait2 | total number of connections of type: fin_wait2 |
| time_wait | total number of connections of type: time_wait |
| close | total number of connections of type: close |
| close_wait | total number of connections of type: close_wait |
| last_ack | total number of connections of type: last_ack |
| listen | total number of connections of type: listen |
| closing | total number of connections of type: closing |
| new_syn_recv | total number of connections of type: new_syn_recv |