Forked from basi/node-exporter
It is a simple node-exporter image that adds the capability of obtain the host hostname and expose it as a value in the container.
To launch it as a global service in a swarm cluster:
docker \
service create --mode global \
--name node-exporter \
--mount type=bind,source=/proc,target=/host/proc \
--mount type=bind,source=/sys,target=/host/sys \
--mount type=bind,source=/,target=/rootfs \
--mount type=bind,source=/etc/hostname,target=/etc/host_hostname \
-e HOST_HOSTNAME=/etc/host_hostname \
basi/node-exporter:latest \
--path.procfs /host/proc \
--path.sysfs /host/sys \
--collector.filesystem.ignored-mount-points "^/(sys|proc|dev|host|etc)($|/)" \
--collector.textfile.directory /etc/node-exporter/
The important add over the official image is the bind mount of the host /etc/hosts file in a specific location in the service. This mount is used by the container to obtain the hostname of the host where the service is running.
It can be useful to use this value in a swarm cluster when obtaining data in Prometheus, while it does not support swarm mode natively.
With original version, Grafan will still shows inactive hosts in host dropdown list. By setting the real hostname as file name at /etc/node-exporter/$host_hostname.prom, quering label_values(node_textfile_mtime,file) in Grafana can show hostnames only from running hosts.