init

.gitlab/.gitlab-ci.yml

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+image: docker:latest
+
+stages:
+    - publish
+
+docker:
+    stage: publish
+    before_script:
+        - docker login -u $CI_REGISTRY_USER -p $CI_JOB_TOKEN $CI_REGISTRY
+    script:
+        - docker build --no-cache -t "$CI_REGISTRY_IMAGE:latest" -t ztimson/node-exporter:latest .
+        - docker push "$CI_REGISTRY_IMAGE:latest"
+        - docker push "ztimson/node-exporter:latest"
+    rules:
+        - if: $CI_COMMIT_BRANCH

Dockerfile

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+FROM prom/node-exporter:latest
+
+COPY entrypoint.sh /etc/node-exporter/
+RUN chmod +x /etc/node-exporter/entrypoint.sh
+
+ENTRYPOINT  [ "/etc/node-exporter/docker-entrypoint.sh" ]
+CMD [ "/bin/node_exporter" ]

README.md

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+# Node-Exporter
+
+This is a copy of [prom/node-exporter](https://hub.docker.com/r/prom/node-exporter) which also add's the hostname metric.
+
+## Example
+
+For the hostname to be detected, you must load the host filesystem into the container's `/host` directory as seen here.
+
+```
+version: '3.8'
+
+services:
+  node-exporter:
+    image: ztimson/node-exporter:latest
+    command:
+      - --path.rootfs=/host
+    volumes:
+      - /:/host:ro,rslave
+    networks:
+      - network
+    deploy:
+      mode: global
+```
+
+Otherwise use the `$HOSTNAME` variable to specify the path to the *hostname file* & ensure it's mounted.

entrypoint.sh

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+#!/bin/sh
+
+if [ -z "$HOSTNAME" ]; then $HOSTNAME="/host/hostname"; fi
+
+NODE_NAME=$(cat "$HOSTNAME")
+echo "node_meta{node_name=\"$NODE_NAME\"} 1" > /etc/node-exporter/node-meta.prom
+set -- /bin/node_exporter "$@"
+exec "$@"