Prometheus WireGuard Exporter

Intro

A Prometheus exporter for WireGuard, written in Rust. This tool exports the wg show all dump (or wg show <interface> dump if you specify a config file) results in a format that Prometheus can understand. The exporter is very light on your server resources, both in terms of memory and CPU usage.

Changelog

• From release 3.3.1 the exporter accepts multiple interfaces in the command line options. Just pass the -i parameter multiple times. Note the not specifying the interface is equivalent to specifying every one of them (the exporter will pass the all parameter to wg show command).
• BREAKING Starting from release 3.3.0 the exporter allows you to specify a different interface from the file name. Previously if you specified the file name (the -n flag) the program would infer the interface name from the file name. Now the two items are decoupled: you need to specify the file name (with -n) and the interface name (with -i) separately. Thank you Vincent Debergue for helping with this (see issue #22). Upgrading from 3.2.4: Please note that the -n flag no longer infer automatically the interface name from the file name. We now have the -i parameter for that. In order to keep the previous behaviour (if you use the -n flag) please add the -i flag to the command line arguments as well. For example, if you had prometheus_wireguard_exporter -n /etc/wireguard/wg0.conf you must specify prometheus_wireguard_exporter -n /etc/wireguard/wg0.conf -i wg0 to keep the same behaviour.
• From release 3.0.0 the exporter allows two label modes: one is to dump every allowed ip in a single label (called allowed_ips) along with their subnets. The second one is to create a pair of labels for each allowed ip/subnet pair (called allowed_ip_0/allowed_subnet_0, allowed_ip_1/allowed_subnet_1 and so on for every allowed ip). The default if the single label mode but you can enable the second mode by specifying the -s switch at startup. Thank you Toon Schoenmakers for this solution (see issue #8).
• Starting from release 2.0.2 this exporter supports IPv6 addresses too (thanks to Maximilian Bosch's PR #5).

Prerequisites

• You need Rust to compile this code. Simply follow the instructions on Rust's website to install the toolchain. If you get weird errors while compiling please try and update your Rust version first (I have developed it on rustc 1.42.0 (b8cedc004 2020-03-09)).
• You need WireGuard and the wg CLI in the path. The tool will call wg show <interface(s)>|all dump and of course will fail if the wg executable is not found. If you want I can add the option of specifying the wg path in the command line, just open an issue for it.

Compilation

To compile the latest master version:

git clone https://github.com/MindFlavor/prometheus_wireguard_exporter.git
cd prometheus_wireguard_exporter
cargo install --path .

If you want the latest release you can simply use:

cargo install prometheus_wireguard_exporter

Usage

Start the binary with -h to get the complete syntax. The parameters are:

Parameter	Mandatory	Valid values	Default	Accepts multiple occurrences?	Description
-v	no			No	Enable verbose mode.
-l	no	any valid ip address	0.0.0.0	No	Specify the service address. This is the address your Prometheus instance should point to.
-p	no	any valid port number	9586	No	Specify the service port. This is the port your Prometheus instance should point to.
-n	no	path to the wireguard configuration file		No	This flag adds the friendly_name attribute to the exported entries. See Friendly names for more details.
-s	no		off	No	Enable the allowed ip + subnet split mode for the labels.
-r	no		off	No	Exports peer's remote ip and port as labels (if available).
-i	no	your interface name(s)	all	Yes	Specifies the interface(s) passed to the wg show <interface> dump parameter. Multiple parameters are allowed.

Once started, the tool will listen on the specified port (or the default one, 9586, if not specified) and return a Prometheus valid response at the url /metrics. So to check if the tool is working properly simply browse the http://localhost:9586/metrics (or whichever port you choose).

Friendly Names

Starting from version 1.2 you can instruct the exporter to append a friendly name to the exported entries. This can make the output more understandable than using the public keys. For example this is the standard output:

# HELP wireguard_sent_bytes_total Bytes sent to the peer
# TYPE wireguard_sent_bytes_total counter
wireguard_sent_bytes_total{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ips="10.70.0.2/32,10.70.0.66/32"} 3208804
wireguard_sent_bytes_total{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ips="10.70.0.3/32"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ips="10.70.0.4/32"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ips="10.70.0.50/32"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ips="10.70.0.40/32"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ips="10.70.0.80/32"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ips="10.70.0.5/32"} 0
# HELP wireguard_received_bytes_total Bytes received from the peer
# TYPE wireguard_received_bytes_total counter
wireguard_received_bytes_total{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ips="10.70.0.2/32,10.70.0.66/32"} 71420072
wireguard_received_bytes_total{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ips="10.70.0.3/32"} 0
wireguard_received_bytes_total{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ips="10.70.0.4/32"} 0
wireguard_received_bytes_total{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ips="10.70.0.50/32"} 0
wireguard_received_bytes_total{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ips="10.70.0.40/32"} 0
wireguard_received_bytes_total{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ips="10.70.0.80/32"} 0
wireguard_received_bytes_total{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ips="10.70.0.5/32"} 0
# HELP wireguard_latest_handshake_seconds Seconds from the last handshake
# TYPE wireguard_latest_handshake_seconds gauge
wireguard_latest_handshake_seconds{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ips="10.70.0.2/32,10.70.0.66/32"} 1562834127
wireguard_latest_handshake_seconds{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ips="10.70.0.3/32"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ips="10.70.0.4/32"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ips="10.70.0.50/32"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ips="10.70.0.40/32"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ips="10.70.0.80/32"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ips="10.70.0.5/32"} 0

And this is the one augmented with friendly names:

# HELP wireguard_sent_bytes_total Bytes sent to the peer
# TYPE wireguard_sent_bytes_total counter
wireguard_sent_bytes_total{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ips="10.70.0.2/32,10.70.0.66/32",friendly_name="OnePlus 6T"} 3208804
wireguard_sent_bytes_total{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ips="10.70.0.3/32",friendly_name="varch.local (laptop)"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ips="10.70.0.4/32",friendly_name="cantarch"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ips="10.70.0.50/32",friendly_name="frcognoarch"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ips="10.70.0.40/32",friendly_name="frcognowin10"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ips="10.70.0.80/32",friendly_name="OnePlus 5T"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ips="10.70.0.5/32",friendly_name="folioarch"} 0
# HELP wireguard_received_bytes_total Bytes received from the peer
# TYPE wireguard_received_bytes_total counter
wireguard_received_bytes_total{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ips="10.70.0.2/32,10.70.0.66/32",friendly_name="OnePlus 6T"} 71420072
wireguard_received_bytes_total{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ips="10.70.0.3/32",friendly_name="varch.local (laptop)"} 0
wireguard_received_bytes_total{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ips="10.70.0.4/32",friendly_name="cantarch"} 0
wireguard_received_bytes_total{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ips="10.70.0.50/32",friendly_name="frcognoarch"} 0
wireguard_received_bytes_total{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ips="10.70.0.40/32",friendly_name="frcognowin10"} 0
wireguard_received_bytes_total{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ips="10.70.0.80/32",friendly_name="OnePlus 5T"} 0
wireguard_received_bytes_total{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ips="10.70.0.5/32",friendly_name="folioarch"} 0
# HELP wireguard_latest_handshake_seconds Seconds from the last handshake
# TYPE wireguard_latest_handshake_seconds gauge
wireguard_latest_handshake_seconds{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ips="10.70.0.2/32,10.70.0.66/32",friendly_name="OnePlus 6T"} 1562834127
wireguard_latest_handshake_seconds{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ips="10.70.0.3/32",friendly_name="varch.local (laptop)"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ips="10.70.0.4/32",friendly_name="cantarch"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ips="10.70.0.50/32",friendly_name="frcognoarch"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ips="10.70.0.40/32",friendly_name="frcognowin10"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ips="10.70.0.80/32",friendly_name="OnePlus 5T"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ips="10.70.0.5/32",friendly_name="folioarch"} 0

In order for this to work, you need to add comments to your wireguard configuration file (below the [Peer] definition). The comment will be interpreted as friendly_name and added to the entry exported to Prometheus. Note that this is not a standard but, since it's a comment, will not interfere with WireGuard in any way. For example this is how you edit your WireGuard configuration file:

[Peer]
PublicKey = lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=
AllowedIPs = 10.70.0.40/32

[Peer]
PublicKey = 928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=
AllowedIPs = 10.70.0.80/32

[Peer]
# frcognowin10
PublicKey = lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=
AllowedIPs = 10.70.0.40/32

[Peer]
# OnePlus 5T
PublicKey = 928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=
AllowedIPs = 10.70.0.80/32

As you can see, all you need to do is to add the friendly name as comment (and enable the flag since this feature is opt-in).

This is a sample of the label split mode:

# HELP wireguard_sent_bytes_total Bytes sent to the peer
# TYPE wireguard_sent_bytes_total counter
wireguard_sent_bytes_total{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ip_0="10.70.0.2",allowed_subnet_0="32",allowed_ip_1="10.70.0.66",allowed_subnet_1="32",friendly_name="OnePlus 6T"} 3208804
wireguard_sent_bytes_total{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ip_0="10.70.0.3",allowed_subnet_0="32",friendly_name="varch.local (laptop)"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ip_0="10.70.0.4",allowed_subnet_0="32",friendly_name="cantarch"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ip_0="10.70.0.50",allowed_subnet_0="32",friendly_name="frcognoarch"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ip_0="10.70.0.40",allowed_subnet_0="32",friendly_name="frcognowin10"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ip_0="10.70.0.80",allowed_subnet_0="32",friendly_name="OnePlus 5T"} 0
wireguard_sent_bytes_total{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ip_0="10.70.0.5",allowed_subnet_0="32",friendly_name="folioarch"} 0
# HELP wireguard_received_bytes_total Bytes received from the peer
# TYPE wireguard_received_bytes_total counter
wireguard_received_bytes_total{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ip_0="10.70.0.2",allowed_subnet_0="32",allowed_ip_1="10.70.0.66",allowed_subnet_1="32",friendly_name="OnePlus 6T"} 71420072
wireguard_received_bytes_total{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ip_0="10.70.0.3",allowed_subnet_0="32",friendly_name="varch.local (laptop)"} 0
wireguard_received_bytes_total{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ip_0="10.70.0.4",allowed_subnet_0="32",friendly_name="cantarch"} 0
wireguard_received_bytes_total{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ip_0="10.70.0.50",allowed_subnet_0="32",friendly_name="frcognoarch"} 0
wireguard_received_bytes_total{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ip_0="10.70.0.40",allowed_subnet_0="32",friendly_name="frcognowin10"} 0
wireguard_received_bytes_total{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ip_0="10.70.0.80",allowed_subnet_0="32",friendly_name="OnePlus 5T"} 0
wireguard_received_bytes_total{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ip_0="10.70.0.5",allowed_subnet_0="32",friendly_name="folioarch"} 0
# HELP wireguard_latest_handshake_seconds Seconds from the last handshake
# TYPE wireguard_latest_handshake_seconds gauge
wireguard_latest_handshake_seconds{interface="wg0",public_key="2S7mA0vEMethCNQrJpJKE81/JmhgtB+tHHLYQhgM6kk=",allowed_ip_0="10.70.0.2",allowed_subnet_0="32",allowed_ip_1="10.70.0.66",allowed_subnet_1="32",friendly_name="OnePlus 6T"} 1562834127
wireguard_latest_handshake_seconds{interface="wg0",public_key="qnoxQoQI8KKMupLnSSureORV0wMmH7JryZNsmGVISzU=",allowed_ip_0="10.70.0.3",allowed_subnet_0="32",friendly_name="varch.local (laptop)"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="L2UoJZN7RmEKsMmqaJgKG0m1S2Zs2wd2ptAf+kb3008=",allowed_ip_0="10.70.0.4",allowed_subnet_0="32",friendly_name="cantarch"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="MdVOIPKt9K2MPj/sO2NlWQbOnFJ6L/qX80mmhQwsUlA=",allowed_ip_0="10.70.0.50",allowed_subnet_0="32",friendly_name="frcognoarch"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="lqYcojJMsIZXMUw1heAFbQHBoKjCEaeo7M1WXDh/KWc=",allowed_ip_0="10.70.0.40",allowed_subnet_0="32",friendly_name="frcognowin10"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="928vO9Lf4+Mo84cWu4k1oRyzf0AR7FTGoPKHGoTMSHk=",allowed_ip_0="10.70.0.80",allowed_subnet_0="32",friendly_name="OnePlus 5T"} 0
wireguard_latest_handshake_seconds{interface="wg0",public_key="wTjv6hS6fKfNK+SzOLo7O6BQjEb6AD1TN9GjwZ08IwA=",allowed_ip_0="10.70.0.5",allowed_subnet_0="32",friendly_name="folioarch"} 0

Systemd service file

Now add the exporter to the Prometheus exporters as usual. I recommend to start it as a service. It's necessary to run it as root (if there is a non-root way to call wg show all dump please let me know). My systemd service file is like this one:

[Unit]
Description=Prometheus WireGuard Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=root
Group=root
Type=simple
ExecStart=/usr/local/bin/prometheus_wireguard_exporter -n /etc/wireguard/peers.conf -i wg0 -i wg1

[Install]
WantedBy=multi-user.target