Export host and docker metrics to a Prometheus instance
License: GNU General Public License v3.0
Package responsible of get metrics from the system to be able to check its healthy, based on the tools cadvisor and node_exporter.
This is early stage software and it's just a PoC
This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details
Original issue at dappnode/DAppNodePackage-DMS#26
Research how to decreas CPU consumption of cadvisor
Missing a license file only mentioned in the readme
Research for packages using exporter as dependency and put DMS
Debian Bullseye is using cgroups V2. Cadvisor has been releasing new updates to support this feature, whereas seems to still be under development.
Metrics that Cadvisor is not collecting propertly from cgroups V2:
Note solution should not go through downgrading cgroup from V1 to V2
Exporter package will be deprecated in favor of DMS package
A few users have reported already a problem with the docker grafana dashboard, saying that it is not displaying data. More info in this forum post,
When trying to visualize the catvisor at URL: http://dappnode-exporter.dappnode:8080/containers/, it throws the following message:
failed to get container "/" with error: unable to find data in memory cache
Error logs:
W0126 16:32:25.252736 8 container.go:526] Failed to update stats for container "/system.slice/systemd-udevd.service": failed to parse memory.usage_in_bytes - open /sys/fs/cgroup/system.slice/systemd-udevd.service/memory.usage_in_bytes: no such file or directory, continuing to push stats
W0126 16:32:26.760486 8 container.go:526] Failed to update stats for container "/init.scope": failed to parse memory.usage_in_bytes - open /sys/fs/cgroup/init.scope/memory.usage_in_bytes: no such file or directory, continuing to push stats
W0126 16:32:27.575993 8 container.go:526] Failed to update stats for container "/system.slice/containerd.service": failed to parse memory.usage_in_bytes - open /sys/fs/cgroup/system.slice/containerd.service/memory.usage_in_bytes: no such file or directory, continuing to push stats
W0126 16:32:27.762294 8 container.go:526] Failed to update stats for container "/system.slice/docker-d554732b6d34836c7af1cb17bc9b2f1410d371dfef390839235f616551697ad0.scope": failed to parse memory.usage_in_bytes - open /sys/fs/cgroup/system.slice/docker-d554732b6d34836c7af1cb17bc9b2f1410d371dfef390839235f616551697ad0.scope/memory.usage_in_bytes: no such file or directory, continuing to push stats
W0126 16:32:27.769149 8 container.go:526] Failed to update stats for container "/user.slice/user-1000.slice": failed to parse memory.usage_in_bytes - open /sys/fs/cgroup/user.slice/user-1000.slice/memory.usage_in_bytes: no such file or directory, continuing to push stats
After investigating this problem there might be two possible problem sources, both of them related to docker:
Docker version: it works on less than 19. Not working on 20.10.2
Users with dappnode instlled from an older version (core 0.2.39 or so): docker was installed in a completely different way, so the following path /usr/src/dappnode/bin/docker exists and this may be breaking how the catvisor read the logs from docker containers.
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