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Adrien Beaudouin
2022-02-25 15:06:30 +01:00
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content/posts/06-build-your-own-docker-swarm-cluster-part-5/index.md
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@ -30,7 +30,7 @@ I'll not use GlusterFS volume for storing Prometheus data, because :
First go to the `manager-01` node settings in Portainer inside *Swarm Cluster overview*, and apply a new label that indicates that this node is the host of Prometheus data.
![Prometheus host overview](portainer-host-overview.png)
[![Prometheus host overview](portainer-host-overview.png)](portainer-host-overview.png)
It's equivalent of doing :
@ -105,11 +105,11 @@ Deploy it and <https://prometheus.sw.okami101.io> should be available after few
You should now have access to some metrics !
![Prometheus graph](prometheus-graph.png)
[![Prometheus graph](prometheus-graph.png)](prometheus-graph.png)
In *Status > Targets*, you should have 2 endpoints enabled, which correspond to above scrape config.
![Prometheus targets](prometheus-targets.png)
[![Prometheus targets](prometheus-targets.png)](prometheus-targets.png)
### Get cluster metrics
@ -135,7 +135,7 @@ set -- /bin/node_exporter "$@"
exec "$@"
```
![Portainer configs](portainer-configs.png)
[![Portainer configs](portainer-configs.png)](portainer-configs.png)
It will take the node hostname and create an exploitable data metric for prometheus.
@ -212,11 +212,11 @@ You need to restart Prometheus service in order to apply above config.
Go back to the Prometheus targets UI in order to confirm the apparition of 2 new targets.
![Prometheus targets all](prometheus-targets-all.png)
[![Prometheus targets all](prometheus-targets-all.png)](prometheus-targets-all.png)
Confirm you fetch the `node_meta` metric with proper hostnames :
![Prometheus targets all](prometheus-node-meta.png)
[![Prometheus targets all](prometheus-node-meta.png)](prometheus-node-meta.png)
## Visualization with Grafana 📈
@ -284,7 +284,7 @@ networks:
Set proper `GF_DATABASE_PASSWORD` and deploy. Database migration should be automatic (don't hesitate to check inside pgAdmin). Go to <https://grafana.sw.okami101.io> and login as admin / admin.
![Grafana home](grafana-home.png)
[![Grafana home](grafana-home.png)](grafana-home.png)
### Docker Swarm dashboard
@ -292,11 +292,11 @@ For best show-case scenario of Grafana, let's import an [existing dashboard](htt
First we need to add Prometheus as main metrics data source. Go to *Configuration > Data source* menu and click on *Add data source*. Select Prometheus and set the internal docker prometheus URL, which should be `http://prometheus:9090`.
![Grafana prometheus datasource](grafana-prometheus-datasource.png)
[![Grafana prometheus datasource](grafana-prometheus-datasource.png)](grafana-prometheus-datasource.png)
Then go to *Create > Import*, load `11939` as dashboard ID, and select Prometheus source and woha!
![Grafana home](grafana-docker-swarm-dashboard.png)
[![Grafana home](grafana-docker-swarm-dashboard.png)](grafana-docker-swarm-dashboard.png)
The *Available Disk Space* metrics card should indicate N/A because not properly configured for Hetzner disks. Just edit the card and change the PromQL inside *Metrics browser* field by replacing `device="rootfs", mountpoint="/"` by `device="/dev/sda1", mountpoint="/host"`.
@ -403,7 +403,7 @@ Expand the prometheus config with 3 new jobs :
Then restart Prometheus service and go back to targets to check you have all new `data-01` endpoints.
![Prometheus targets data](prometheus-targets-data.png)
[![Prometheus targets data](prometheus-targets-data.png)](prometheus-targets-data.png)
### Grafana dashboards for data
@ -419,15 +419,15 @@ Nothing more to do !
#### Node Dashboard
![Prometheus targets data](grafana-node-exporter.png)
[![Prometheus targets data](grafana-node-exporter.png)](grafana-node-exporter.png)
#### MySQL Dashboard
![Prometheus targets data](grafana-mysql-exporter.png)
[![Prometheus targets data](grafana-mysql-exporter.png)](grafana-mysql-exporter.png)
#### PostgreSQL Dashboard
![Prometheus targets data](grafana-postgres-exporter.png)
[![Prometheus targets data](grafana-postgres-exporter.png)](grafana-postgres-exporter.png)
## 4th check ✅