CAdvisor's latest update 0.24.1 adds support (dependence) on device-mapper.
It will look for thin_ls in both / and /rootfs/ so this is /probably/ only a problem for docker hosts that don't have the device-mapper kernels+tooling.
In my case:
$ cat /etc/issue
Amazon Linux AMI release 2016.03
==> /var/log/dataloop/cadvisor.log <==
Started container cadvisor service
E1103 22:53:36.998302 24 factory.go:291] devicemapper filesystem stats will not be reported: unable to find thin_ls binary
CAdvisor's latest update 0.24.1 adds support (dependence) on device-mapper. It will look for and /rootfs/ so this is /probably/ only a problem for docker hosts that don't have the device-mapper kernels+tooling.
In my case:
thin_lsin both /Some debug info: https://gist.github.com/zaquestion/17d485543af884b45a5f62b21f1f613c