mofe/netdata repository overview

⁠netdata

Dockerfile for building and running a netdata deamon for your host instance.

Netdata monitors your server with thoughts of performance and memory usage, providing detailed insight into very recent server metrics. It's nice, and now it's also dockerized.

More info about project: https://github.com/firehol/netdata⁠

⁠Using

docker run -d --cap-add SYS_PTRACE --name netdata -v /proc:/host/proc:ro -v /sys:/host/sys:ro -p 19999:19999 titpetric/netdata

Open a browser on http://server:19999/⁠ and watch how your server is doing.

⁠Environment variables

It's possible to pass a NETDATA_PORT environment variable with -e, to start up netdata on a different port.

docker run -e NETDATA_PORT=80 [...]

⁠Some explanation is in order

Docker needs to run with the SYS_PTRACE capability. Without it, the mapped host/proc filesystem is not fully readable to the netdata deamon, more specifically the "apps" plugin:

16-01-12 07:58:16: ERROR: apps.plugin: Cannot process /host/proc/1/io (errno 13, Permission denied)

See the following link for more details: https://github.com/docker/docker/issues/6607⁠

⁠Additional notes

Netdata provides monitoring via a plugin architecture. This plugin supports many projects that don't provide data over the /proc filesystem. When you're running netdata in the container, you will have difficulty providing many of these paths to the netdata container.

I'm not saying it's not possible - I'm saying that it's not easy, and it might not be worth the time.

If you're using the docker version, you should use it for two reasons:

1. Limited requirements: You only care about the system/network metrics which are available in /proc,
2. Evaluation: You'd like to run netdata in an isolated environment before you decide to go "all in".

What I can tell you is that it's very stable, and snappy. Godspeed!