First cut on 2.0 stats API. Main change in returned stats is that presence checks (eg. HasCPU) are embedded in each stat.
Added support to handle querying container with name.
Current syntax:
/stats?name=/&count=1,
/stats?name=docker/928c058ce260ac2a55972b18cb991fa0475fbbb7bc15bd295e62b76964d05fe6 [default count: 64]
Other handlers to include: dockerid, dockeralias. We can make subcontainers inclusion as an option too.
/storage returns {device, mountpoint, capacity, usage} for all filesystems.
In addition, it also detect and applies label for each filesystem - currently two - "root", "docker-images".
/storage/<label> returns info about the filesystem with specific label. eg. /storage/root returns info for root filesystem.
Before this change, we do not return anything meaningful till cadvisor has been up
for a minute. Also, having instant usage in the same stat gives a more complete
picture.
Type can be one of "none", "noop", "deadline", "cfq".
For block devices that don't use scheduler (like dm), the type will be "none".
We'll also report "none" for partitions when we start reporting those.
The stats are only populated when cAdvisor is running outside network namespaces.
We'll add a different backend to retrieve the same data from within namespaces.
This is read once at start of cAdvisor. We can use this to report
machine state as well as return logical name for block devices in UI.
Signed-off-by: Rohit Jnagal <jnagal@google.com> (github: rjnagal)
This is done by introducting the concept of "namespaces" of container
names. The aliases of a container are under this namespace. Namespace
names are of the form:
//<namespace>/<alias>
This allows us to (within cAdvisor) query all docker containers as
//docker regardless of whether this is a systemd or a non-systemd system.
This does break our ability to handle Docker aliases with the /container
endpoint. I think this is acceptable as our support there was not
consistent between system types.
