Add differ options and package with interface.
Update optional values on diff interface to use options.
Signed-off-by: Derek McGowan <derek@mcgstyle.net>
With this change, we integrate all the plugin changes into the
introspection service.
All plugins can be listed with the following command:
```console
$ ctr plugins
TYPE ID PLATFORM STATUS
io.containerd.content.v1 content - ok
io.containerd.metadata.v1 bolt - ok
io.containerd.differ.v1 walking linux/amd64 ok
io.containerd.grpc.v1 containers - ok
io.containerd.grpc.v1 content - ok
io.containerd.grpc.v1 diff - ok
io.containerd.grpc.v1 events - ok
io.containerd.grpc.v1 healthcheck - ok
io.containerd.grpc.v1 images - ok
io.containerd.grpc.v1 namespaces - ok
io.containerd.snapshotter.v1 btrfs linux/amd64 error
io.containerd.snapshotter.v1 overlayfs linux/amd64 ok
io.containerd.grpc.v1 snapshots - ok
io.containerd.monitor.v1 cgroups linux/amd64 ok
io.containerd.runtime.v1 linux linux/amd64 ok
io.containerd.grpc.v1 tasks - ok
io.containerd.grpc.v1 version - ok
```
There are few things to note about this output. The first is that it is
printed in the order in which plugins are initialized. This useful for
debugging plugin initialization problems. Also note that even though the
introspection GPRC api is a itself a plugin, it is not listed. This is
because the plugin takes a snapshot of the initialization state at the
end of the plugin init process. This allows us to see errors from each
plugin, as they happen. If it is required to introspect the existence of
the introspection service, we can make modifications to include it in
the future.
The last thing to note is that the btrfs plugin is in an error state.
This is a common state for containerd because even though we load the
plugin, most installations aren't on top of btrfs and the plugin cannot
be used. We can actually view this error using the detailed view with a
filter:
```console
$ ctr plugins --detailed id==btrfs
Type: io.containerd.snapshotter.v1
ID: btrfs
Platforms: linux/amd64
Exports:
root /var/lib/containerd/io.containerd.snapshotter.v1.btrfs
Error:
Code: Unknown
Message: path /var/lib/containerd/io.containerd.snapshotter.v1.btrfs must be a btrfs filesystem to be used with the btrfs snapshotter
```
Along with several other values, this is a valuable tool for evaluating the
state of components in containerd.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
After several requests for information about platform support,
configuration introspection and feature switches, we now have a solution
that should work in all these use cases. The Introspection API hooks
into the plugin subsystem registration process. During registration,
plugins declare several pieces of information, allowing clients to
discover the cababilities and support that a containerd instance
provides, including whether or not it loaded with an error.
To allow symmetrical error reporting, the `google/rpc.Status` protobuf
definitions have been brought in from the googleapis project.
Unfortunately, we had to generate these in place to match our protobuf
system.
Once we like this design, we can add an implementation to integrate it
directly with the plugin system.
Enjoy!
Signed-off-by: Stephen J Day <stephen.day@docker.com>
By default, the generated spec will place containers in cgroups by their
ids, we need to use the namespace as the cgroup root to avoid
containers with the same name being placed in the same cgroup.
```
11:perf_event:/to/redis
10:freezer:/to/redis
9:memory:/to/redis
8:devices:/to/redis
7:net_cls,net_prio:/to/redis
6:pids:/to/redis
5:hugetlb:/to/redis
4:cpuset:/to/redis
3:blkio:/to/redis
2:cpu,cpuacct:/to/redis
1:name=systemd:/to/redis
11:perf_event:/te/redis
10:freezer:/te/redis
9:memory:/te/redis
8:devices:/te/redis
7:net_cls,net_prio:/te/redis
6:pids:/te/redis
5:hugetlb:/te/redis
4:cpuset:/te/redis
3:blkio:/te/redis
2:cpu,cpuacct:/te/redis
1:name=systemd:/te/redis
```
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This prevents `task.Wait()` to return an error if it is called before the task
is started.
Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
This commit adds a collection step in the Stop() task handler which will
retrieve the metrics available for this container at that time, and
store them until the next prometheus Collect() cycle.
This allows short-lived containers to be visible in prometheus, which
would otherwise be ignored (for example, running containerd-stress would
show something like 2 or 3 containers in the end, while now we can see
all of them). It also allows for more accurate collection when
long-running containers end (for example CPU usage could spike in the
last few seconds).
A simple case illustrating this with cpu usage would be:
ctr run -t --rm docker.io/library/alpine:latest mycontainer sh -c 'yes > /dev/null & sleep 3 && pkill yes'
Signed-off-by: Mathieu Pasquet <mathieu.pasquet@alterway.fr>
This makes sure the client is always in sync with the server before
performing any type of operations on the container metadata.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Updates metadata plugin to require content and
snapshotter plugins be loaded and initializes with
those plugins, keeping the metadata database structure
static after initialization. Service plugins now only
require metadata plugin access snapshotter or content
stores through metadata, which was already required
behavior of the services.
Signed-off-by: Derek McGowan <derek@mcgstyle.net>
Adds back links from parent to children in order to prevent
deletion of a referenced snapshot in a namespace.
Avoid removing snapshot during metadata delete to
prevent shared namespaces from being mistakenly deleted.
Signed-off-by: Derek McGowan <derek@mcgstyle.net>
This is needed for users on kernel older than 3.18 so they can avoid EBUSY
errors when trying to unlink, rename or remove a mountpoint that is present in
a shim namespace.
Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
