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The iptables plugin aims at monitoring bytes and packet counters matching a given set of iptables rules. Typically the user would set a dedicated monitoring chain into a given iptables table, and add the rules to monitor to this chain. The plugin will allow to focus on the counters for this particular table/chain. closes #1471 |
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| README.md | ||
| iptables.go | ||
| iptables_nocompile.go | ||
| iptables_test.go | ||
README.md
Iptables Plugin
The iptables plugin gathers packets and bytes counters for rules within a set of table and chain from the Linux's iptables firewall.
Rules are identified through associated comment. Rules without comment are ignored.
The iptables command requires CAP_NET_ADMIN and CAP_NET_RAW capabilities. You have several options to grant telegraf to run iptables:
- Run telegraf as root. This is strongly discouraged.
- Configure systemd to run telegraf with CAP_NET_ADMIN and CAP_NET_RAW. This is the simplest and recommended option.
- Configure sudo to grant telegraf to run iptables. This is the most restrictive option, but require sudo setup.
Using systemd capabilities
You may run systemctl edit telegraf.service and add the following:
[Service]
CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN
AmbientCapabilities=CAP_NET_RAW CAP_NET_ADMIN
Since telegraf will fork a process to run iptables, AmbientCapabilities is required to transmit the capabilities bounding set to the forked process.
Using sudo
You may edit your sudo configuration with the following:
telegraf ALL=(root) NOPASSWD: /usr/bin/iptables -nvL *
Configuration:
# use sudo to run iptables
use_sudo = false
# defines the table to monitor:
table = "filter"
# defines the chains to monitor:
chains = [ "INPUT" ]
Measurements & Fields:
- iptables
- pkts (integer, count)
- bytes (integer, bytes)
Tags:
- All measurements have the following tags:
- table
- chain
- ruleid
The ruleid is the comment associated to the rule.
Example Output:
$ iptables -nvL INPUT
Chain INPUT (policy DROP 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
100 1024 ACCEPT tcp -- * * 192.168.0.0/24 0.0.0.0/0 tcp dpt:22 /* ssh */
42 2048 ACCEPT tcp -- * * 192.168.0.0/24 0.0.0.0/0 tcp dpt:80 /* httpd */
$ ./telegraf -config telegraf.conf -input-filter iptables -test
iptables,table=filter,chain=INPUT,ruleid=ssh pkts=100i,bytes=1024i 1453831884664956455
iptables,table=filter,chain=INPUT,ruleid=httpd pkts=42i,bytes=2048i 1453831884664956455