About node_exporter

node_exporter exposes Linux host metrics to Prometheus. dbbot now ships it as a separate playbook so you can deploy it only on the hosts that actually need host monitoring.

Default values

The default variables are located in mysql_ansible/playbooks/default/var_node_exporter_install.yml:

node_exporter_install: true
node_exporter_install_type: dbbot
node_exporter_port: 9100

Notes:

By default, dbbot uses the built-in node_exporter binary bundled in the repository.
The target inventory group is dbbot_node_exporter, so you can list DB hosts, Router hosts, or any other Linux hosts independently.
If the customer already has another host monitoring solution, this playbook can be skipped entirely.

Dependency chain

Item	Details
Prerequisites	Target hosts are reachable over SSH; for `package` mode the control node either has internet access or the offline tarball is already prepared
Required variables	`node_exporter_install_type` and `node_exporter_port`
Next step	Register the exporter with `dbbotctl exporter register -t node`

Common scenarios

Default dbbot mode:

node_exporter_install: true
node_exporter_install_type: dbbot
node_exporter_port: 9100

Official package mode:

node_exporter_install: true
node_exporter_install_type: package
node_exporter_package: node_exporter-1.10.2.linux-amd64.tar.gz

Official download example:

wget "https://github.com/prometheus/node_exporter/releases/download/v1.10.2/node_exporter-1.10.2.linux-amd64.tar.gz"

Inventory example

Edit mysql_ansible/inventory/hosts.ini and place the hosts that need host metrics into dbbot_node_exporter:

[dbbot_node_exporter]
192.0.2.131 ansible_user=root ansible_ssh_pass="'<your_ssh_password>'"
192.0.2.151 ansible_user=root ansible_ssh_pass="'<your_ssh_password>'"

Execution entry

cd /usr/local/dbbot/mysql_ansible/playbooks
ansible-playbook node_exporter_install.yml

Registration examples

dbbotctl exporter register -t node -H 192.0.2.131 -s 192.0.2.161 -p ${prometheus_server_root_password}
dbbotctl exporter register -t node -H 192.0.2.151 -s 192.0.2.161 -p ${prometheus_server_root_password}