# Ipset Input Plugin

The ipset plugin gathers packets and bytes counters from Linux ipset.
It uses the output of the command "ipset save".
Ipsets created without the "counters" option are ignored.

Results are tagged with:

- ipset name
- ipset entry

There are 3 ways to grant telegraf the right to run ipset:

- Run as root (strongly discouraged)
- Use sudo
- Configure systemd to run telegraf with CAP_NET_ADMIN and CAP_NET_RAW capabilities.

## Using systemd capabilities

You may run `systemctl edit telegraf.service` and add the following:

```text
[Service]
CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN
AmbientCapabilities=CAP_NET_RAW CAP_NET_ADMIN
```

## Using sudo

You will need the following in your telegraf config:

```toml
[[inputs.ipset]]
  use_sudo = true
```

You will also need to update your sudoers file:

```bash
$ visudo
# Add the following line:
Cmnd_Alias IPSETSAVE = /sbin/ipset save
telegraf  ALL=(root) NOPASSWD: IPSETSAVE
Defaults!IPSETSAVE !logfile, !syslog, !pam_session
```

## Configuration

```toml
  [[inputs.ipset]]
    ## By default, we only show sets which have already matched at least 1 packet.
    ## set include_unmatched_sets = true to gather them all.
    include_unmatched_sets = false
    ## Adjust your sudo settings appropriately if using this option ("sudo ipset save")
    ## You can avoid using sudo or root, by setting appropriate privileges for
    ## the telegraf.service systemd service.
    use_sudo = false
    ## The default timeout of 1s for ipset execution can be overridden here:
    # timeout = "1s"

```

## Example Output

```sh
$ sudo ipset save
create myset hash:net family inet hashsize 1024 maxelem 65536 counters comment
add myset 10.69.152.1 packets 8 bytes 672 comment "machine A"
```

```sh
$ telegraf --config telegraf.conf --input-filter ipset --test --debug
* Plugin: inputs.ipset, Collection 1
> ipset,rule=10.69.152.1,host=trashme,set=myset bytes_total=8i,packets_total=672i 1507615028000000000
```
