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Docker
Copyright 2012-2015 Docker, Inc.
This product includes software developed at Docker, Inc. (https://www.docker.com).
The following is courtesy of our legal counsel:
Use and transfer of Docker may be subject to certain restrictions by the
United States and other governments.
It is your responsibility to ensure that your use and/or transfer does not
violate applicable laws.
For more information, please see https://www.bis.doc.gov
See also https://www.apache.org/dev/crypto.html and/or seek legal counsel.

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You will need to make sure that you have Go installed on your system and the containerd repository is cloned
in your `$GOPATH`. You will also need to make sure that you have all the dependencies cloned as well.
Currently, contributing to containerd is not for the first time devs as many dependencies are not vendored and
work is being completed at a high rate.
After that just run `make` and the binaries for the daemon and client will be localed in the `bin/` directory.
## Downloads
The easy way to test and use containerd is to view the [releases page](https://github.com/docker/containerd/releases) for binary downloads.
We encourage everyone to use containerd this way until it is out of alpha status.
## Performance
Starting 1000 containers concurrently runs at 126-140 containers per second.
@ -43,196 +50,303 @@ Overall start times:
[containerd] 2015/12/04 14:59:54 99.9%: 355ms
```
## Telemetry
# REST API v1
Currently containerd only outputs metrics to stdout but will support dumping to various backends in the future.
## Starting a container
To start a container hit the `/containers/{name}` endpoint with a `POST` request.
The checkpoint field is option but allows you to start the container with the specified
checkpoint name instead of a new instance of the container.
Example:
```bash
curl -XPOST localhost:8888/containers/redis -d '{
"bundlePath": "/containers/redis",
"checkpoint: "checkpoint-name"
}'
```
[containerd] 2015/12/16 11:48:28 timer container-start-time
[containerd] 2015/12/16 11:48:28 count: 22
[containerd] 2015/12/16 11:48:28 min: 25425883
[containerd] 2015/12/16 11:48:28 max: 113077691
[containerd] 2015/12/16 11:48:28 mean: 68386923.27
[containerd] 2015/12/16 11:48:28 stddev: 20928453.26
[containerd] 2015/12/16 11:48:28 median: 65489003.50
[containerd] 2015/12/16 11:48:28 75%: 82393210.50
[containerd] 2015/12/16 11:48:28 95%: 112267814.75
[containerd] 2015/12/16 11:48:28 99%: 113077691.00
[containerd] 2015/12/16 11:48:28 99.9%: 113077691.00
[containerd] 2015/12/16 11:48:28 1-min rate: 0.00
[containerd] 2015/12/16 11:48:28 5-min rate: 0.01
[containerd] 2015/12/16 11:48:28 15-min rate: 0.01
[containerd] 2015/12/16 11:48:28 mean rate: 0.03
[containerd] 2015/12/16 11:48:28 counter containers
[containerd] 2015/12/16 11:48:28 count: 1
[containerd] 2015/12/16 11:48:28 counter events
[containerd] 2015/12/16 11:48:28 count: 87
[containerd] 2015/12/16 11:48:28 counter events-subscribers
[containerd] 2015/12/16 11:48:28 count: 2
[containerd] 2015/12/16 11:48:28 gauge goroutines
[containerd] 2015/12/16 11:48:28 value: 38
[containerd] 2015/12/16 11:48:28 gauge fds
[containerd] 2015/12/16 11:48:28 value: 18
```
## Add a process to an existing container
## Daemon options
To add an additional process to a running container send a `PUT` request to the
`/containers/{name}/processes` endpoint.
Example:
```bash
curl -s -XPUT localhost:8888/containers/redis/process -d '{
"user" : {
"gid" : 0,
"uid" : 0
},
"args" : [
"sh",
"-c",
"sleep 10"
],
"env" : [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"TERM=xterm"
]
}'
```
$ containerd -h
NAME:
containerd - High performance container daemon
USAGE:
containerd [global options] command [command options] [arguments...]
VERSION:
0.0.4
AUTHOR(S):
@crosbymichael <crosbymichael@gmail.com>
COMMANDS:
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--id "deathstar" unique containerd id to identify the instance
--debug enable debug output in the logs
--state-dir "/run/containerd" runtime state directory
-c, --concurrency "10" set the concurrency level for tasks
--metrics-interval "1m0s" interval for flushing metrics to the store
--listen, -l "/run/containerd/containerd.sock" Address on which GRPC API will listen
--oom-notify enable oom notifications for containers
--help, -h show help
--version, -v print the version
```
# Roadmap
## Signal a specific process in a container
The current roadmap and milestones for alpha and beta completion are in the github issues on this repository. Please refer to these issues for what is being worked on and completed for the various stages of development.
To send a signal to any of the containers processes send a `POST` request to
the `/containers/{name}/process/{pid}` endpoint.
# API
Example
## GRPC API
The API for containerd is with GRPC over a unix socket located at the default location of `/run/containerd/containerd.sock`.
At this time please refer to the [proto at](https://github.com/docker/containerd/blob/master/api/grpc/types/api.proto) for the API methods and types.
There is a Go implementation and types checked into this repository but alternate language implementations can be created using the grpc and protoc toolchain.
## containerd CLI
There is a default cli named `ctr` based on the GRPC api.
This cli will allow you to create and manage containers run with containerd.
```
NAME:
ctr - High performance conatiner daemon controller
USAGE:
ctr [global options] command [command options] [arguments...]
VERSION:
0.0.4
AUTHOR(S):
@crosbymichael <crosbymichael@gmail.com>
COMMANDS:
checkpoints list all checkpoints
containers interact with running containers
events receive events from the containerd daemon
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--debug enable debug output in the logs
--address "/run/containerd/containerd.sock" address of GRPC API
--help, -h show help
--version, -v print the version
```
### Listing containers
```bash
curl -s -XPOST localhost:8888/containers/redis/process/1234 -d '{"signal": 15}'
$ sudo ctr containers
ID PATH STATUS PID1
1 /containers/redis running 14063
19 /containers/redis running 14100
14 /containers/redis running 14117
4 /containers/redis running 14030
16 /containers/redis running 14061
3 /containers/redis running 14024
12 /containers/redis running 14097
10 /containers/redis running 14131
18 /containers/redis running 13977
13 /containers/redis running 13979
15 /containers/redis running 13998
5 /containers/redis running 14021
9 /containers/redis running 14075
6 /containers/redis running 14107
2 /containers/redis running 14135
11 /containers/redis running 13978
17 /containers/redis running 13989
8 /containers/redis running 14053
7 /containers/redis running 14022
0 /containers/redis running 14006
```
## Get the state of containerd and all of its containers
### Starting a container
To the the entire state of the containerd instance send a `GET` request
to the `/state` endpoint.
Example:
```bash
curl -s localhost:8888/state
```
$ ctr containers start -h
NAME:
start - start a container
USAGE:
command start [command options] [arguments...]
OPTIONS:
--checkpoint, -c checkpoint to start the container from
--attach, -a connect to the stdio of the container
Response:
```json
{
"containers" : [
{
"state" : {
"status" : "running"
},
"bundlePath" : "/containers/redis",
"id" : "redis",
"processes" : [
{
"args" : [
"redis-server",
"--bind",
"0.0.0.0"
],
"user" : {
"gid" : 1000,
"uid" : 1000
},
"terminal" : false,
"pid" : 11497,
"env" : [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"TERM=xterm"
]
}
]
}
],
"machine" : {
"cpus" : 4,
"memory" : 7872909312
}
}
```
## Create a checkpoint for a container
To create a checkpoint for a container send a `POST` request to the
`/containers/{name}/checkpoint/{checkpointname}` endpoint. All of the options
to this endpoint are optional.
If you send `"exit": true` the container will be stopped after the checkpoint is complete,
the default is to keep the container running.
Example:
```bash
curl -s -XPOST localhost:8888/containers/redis/checkpoint/test1 -d '{
"exit": false,
"tcp": false,
"unixSockets": false,
"shell": false
}'
$ sudo ctr containers start redis /containers/redis
```
## List all checkpoints for a container
### Kill a container's process
To list all checkpoints for a container send a `GET` request to the
`/containers/{name}/checkpoint` endpoint.
```
$ ctr containers kill -h
NAME:
kill - send a signal to a container or it's processes
Example:
USAGE:
command kill [command options] [arguments...]
```bash
curl -s localhost:8888/containers/redis/checkpoint
OPTIONS:
--pid, -p "0" pid of the process to signal within the container
--signal, -s "15" signal to send to the container
```
Response:
### Exec another process into a container
```
$ ctr containers exec -h
NAME:
exec - exec another process in an existing container
USAGE:
command exec [command options] [arguments...]
OPTIONS:
--id container id to add the process to
--attach, -a connect to the stdio of the container
--cwd current working directory for the process
--tty, -t create a terminal for the process
--env, -e [--env option --env option] environment variables for the process
--uid, -u "0" user id of the user for the process
--gid, -g "0" group id of the user for the process
```json
[
{
"name" : "test1",
"unixSockets" : false,
"tcp" : false,
"shell" : false,
"timestamp" : "2015-12-04T15:09:14.915868934-08:00"
},
{
"name" : "test2",
"tcp" : false,
"unixSockets" : false,
"shell" : false,
"timestamp" : "2015-12-04T15:09:14.915868934-08:00"
}
]
```
## Delete a container's checkpoint
### Stats for a container
To delete a container's checkpoint send a `DELETE` request to the
`/containers/redis/checkpoint/{checkpointname}` endpoint.
```
$ ctr containers stats -h
NAME:
stats - get stats for running container
Example:
```bash
curl -XDELETE -s localhost:8888/containers/redis/checkpoint/test1
USAGE:
command stats [arguments...]
```
## Update a container
### List checkpoints
The update endpoint for a container accepts a JSON object with various fields
for the actions you with to perform. To update a container send a `PATCH` request
to the `/containers/{name}` endpoint.
### Pause and resume a container
To pause or resume a continer you want to send a `PATCH` request updating the container's state.
Example:
```bash
# pause a container
curl -XPATCH localhost:8888/containers/redis -d '{"status": "paused"}'
# resume the container
curl -XPATCH localhost:8888/containers/redis -d '{"status": "running"}'
```
$ sudo ctr checkpoints redis
NAME TCP UNIX SOCKETS SHELL
test false false false
test2 false false false
```
### Signal the main process of a container
### Create a new checkpoint
To signal the main process of the container hit the same update endpoint with a different state.
Example:
```bash
curl -s -XPATCH localhost:8888/containers/redis -d '{"signal": 9}'
```
$ ctr checkpoints create -h
NAME:
create - create a new checkpoint for the container
USAGE:
command create [command options] [arguments...]
OPTIONS:
--tcp persist open tcp connections
--unix-sockets perist unix sockets
--exit exit the container after the checkpoint completes successfully
--shell checkpoint shell jobs
```
### Get events
```
$ sudo ctr events
TYPE ID PID STATUS
exit redis 24761 0
```
# License
Apache 2.0 found in the LICENSE file.
### Sign your work
The sign-off is a simple line at the end of the explanation for the patch. Your
signature certifies that you wrote the patch or otherwise have the right to pass
it on as an open-source patch. The rules are pretty simple: if you can certify
the below (from [developercertificate.org](http://developercertificate.org/)):
```
Developer Certificate of Origin
Version 1.1
Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
660 York Street, Suite 102,
San Francisco, CA 94110 USA
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
Developer's Certificate of Origin 1.1
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file; or
(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or
(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.
(d) I understand and agree that this project and the contribution
are public and that a record of the contribution (including all
personal information I submit with it, including my sign-off) is
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.
```
Then you just add a line to every git commit message:
Signed-off-by: Joe Smith <joe.smith@email.com>
Use your real name (sorry, no pseudonyms or anonymous contributions.)
If you set your `user.name` and `user.email` git configs, you can sign your
commit automatically with `git commit -s`.

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)
const (
Usage = `High performance conatiner daemon`
Usage = `High performance container daemon`
minRlimit = 1024
)

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@ -9,7 +9,7 @@ import (
"github.com/docker/containerd"
)
const Usage = `High performance conatiner daemon controller`
const Usage = `High performance container daemon cli`
func main() {
app := cli.NewApp()

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# Attaching to STDIO or TTY
The model for STDIO, TTY, and logging is a little different in containerd.
Because of the various methods that consumers want on the logging side these types of decisions
are pushed to the client.
Containerd API is developed for access on a single host therefore many things like paths on the host system are acceptable in the API.
For the STDIO model the client requesting to start a container provides the paths for the IO.
## Logging
If no options are specified on create all STDIO of the processes launched by containerd will be sent to `/dev/null`.
If you want containerd to send the STDIO of the processes to a file, you can pass paths to the files in the create container method defined by this proto in the stdin, stdout, and stderr fields:
```proto
message CreateContainerRequest {
string id = 1; // ID of container
string bundlePath = 2; // path to OCI bundle
string stdin = 3; // path to the file where stdin will be read (optional)
string stdout = 4; // path to file where stdout will be written (optional)
string stderr = 5; // path to file where stderr will be written (optional)
string console = 6; // path to the console for a container (optional)
string checkpoint = 7; // checkpoint name if you want to create immediate checkpoint (optional)
}
```
## Attach
In order to have attach like functionality for your containers you use the same API request but named pipes or `fifo`s can be be used to achieve this type of functionality.
The default CLI for containerd does this if you specify the `--attach` flag on `create`.
It will create fifos for each of the containers stdio which the CLI can read and write to.
This can be used to create an interactive session with the container, `bash` for example, or to have a blocking way to collect the container's STDIO and forward it to your logging facilities.
## TTY
The tty model is the same as above only the client creates a pty and provides to other side to containerd in the create request in the `console` field.
Containerd will provide the pty to the container to use and the session can be opened with the container after it starts.

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# containerd changes to the bundle
Containerd will make changes to the container's bundle by adding additional files or folders by default with
options to change the output.
The current change that it makes is if you create a checkpoint of a container the checkpoints will be saved
by default in a `{bundle}/checkpoints/{checkpoint name}` in the bundle of the container.
A user can also populate this directory and provide the checkpoint name on the create request so that the container is started from this checkpoint.
As of this point, containerd names no other additions to the bundle and runtime state is currently stored in a tmp filesystem like `/run`.