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[continue 912] strip rootfs prefix for run in docker (#1058)

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* strip rootfs prefix for run in docker
* Use `/` as default value of path.rootfs, and parse mounts from `/proc/1/mounts`.
* No need to mount `/proc` and `/sys` because we share host's PID
namespace, which allows processes within the container to see all of the
processes on the system.

Closes: #66

Signed-off-by: Ivan Mikheykin <ivan.mikheykin@flant.com>
Signed-off-by: Yecheng Fu <cofyc.jackson@gmail.com>
This commit is contained in:
Yecheng Fu 2018-10-04 20:11:21 +08:00 • committed by Ben Kochie
commit 0f9842f20a
4 changed files with 48 additions and 6 deletions
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7
README.md
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@ -144,12 +144,17 @@ The `node_exporter` is designed to monitor the host system. It's not recommended
to deploy it as a Docker container because it requires access to the host system.
Be aware that any non-root mount points you want to monitor will need to be bind-mounted
into the container.
If you start container for host monitoring, specify `path.rootfs` argument.
This argument must match path in bind-mount of host root. The node\_exporter will use
`path.rootfs` as prefix to access host filesystem.
```bash
docker run -d \
--net="host" \
--pid="host" \
quay.io/prometheus/node-exporter
-v "/:/host:ro,rslave" \
quay.io/prometheus/node-exporter \
--path.rootfs /host
```
On some systems, the `timex` collector requires an additional Docker flag,