238 lines
5.8 KiB
Markdown
238 lines
5.8 KiB
Markdown
# containerd
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Another container runtime built for performance and density.
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containerd has advanced features such as seccomp and user namespace support as well
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as checkpoint and restore for cloning and live migration of containers.
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#### Status
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*alpha*
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What does alpha, beta, etc mean?
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* alpha - not feature complete
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* beta - feature complete but needs testing
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* prod ready - read for production
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## Docs
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For more documentation on various subjects refer to the `/docs` directory in this repository.
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## Building
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To build the daemon you will need to cd into the `containerd` directory in the respository and type `make`.
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You will need to make sure that you have Go installed on your system and the containerd repository is cloned
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in your `$GOPATH`. You will also need to make sure that you have all the depedencies cloned as well.
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## Performance
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Starting 1000 containers concurrently runs at 126-140 containers per second.
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Overall start times:
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```
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[containerd] 2015/12/04 15:00:54 count: 1000
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[containerd] 2015/12/04 14:59:54 min: 23ms
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[containerd] 2015/12/04 14:59:54 max: 355ms
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[containerd] 2015/12/04 14:59:54 mean: 78ms
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[containerd] 2015/12/04 14:59:54 stddev: 34ms
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[containerd] 2015/12/04 14:59:54 median: 73ms
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[containerd] 2015/12/04 14:59:54 75%: 91ms
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[containerd] 2015/12/04 14:59:54 95%: 123ms
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[containerd] 2015/12/04 14:59:54 99%: 287ms
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[containerd] 2015/12/04 14:59:54 99.9%: 355ms
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```
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# REST API v1
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## Starting a container
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To start a container hit the `/containers/{name}` endpoint with a `POST` request.
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The checkpoint field is option but allows you to start the container with the specified
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checkpoint name instead of a new instance of the container.
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Example:
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```bash
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curl -XPOST localhost:8888/containers/redis -d '{
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"bundlePath": "/containers/redis",
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"checkpoint: "checkpoint-name"
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}'
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```
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## Add a process to an existing container
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To add an additional process to a running container send a `PUT` request to the
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`/containers/{name}/processes` endpoint.
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Example:
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```bash
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curl -s -XPUT localhost:8888/containers/redis/process -d '{
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"user" : {
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"gid" : 0,
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"uid" : 0
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},
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"args" : [
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"sh",
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"-c",
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"sleep 10"
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],
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"env" : [
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"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
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"TERM=xterm"
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]
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}'
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```
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## Signal a specific process in a container
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To send a signal to any of the containers processes send a `POST` request to
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the `/containers/{name}/process/{pid}` endpoint.
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Example
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```bash
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curl -s -XPOST localhost:8888/containers/redis/process/1234 -d '{"signal": 15}'
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```
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## Get the state of containerd and all of its containers
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To the the entire state of the containerd instance send a `GET` request
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to the `/state` endpoint.
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Example:
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```bash
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curl -s localhost:8888/state
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```
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Response:
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```json
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{
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"containers" : [
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{
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"state" : {
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"status" : "running"
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},
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"bundlePath" : "/containers/redis",
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"id" : "redis",
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"processes" : [
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{
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"args" : [
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"redis-server",
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"--bind",
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"0.0.0.0"
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],
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"user" : {
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"gid" : 1000,
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"uid" : 1000
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},
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"terminal" : false,
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"pid" : 11497,
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"env" : [
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"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
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"TERM=xterm"
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]
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}
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]
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}
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],
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"machine" : {
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"cpus" : 4,
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"memory" : 7872909312
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}
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}
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```
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## Create a checkpoint for a container
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To create a checkpoint for a container send a `POST` request to the
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`/containers/{name}/checkpoint/{checkpointname}` endpoint. All of the options
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to this endpoint are optional.
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If you send `"exit": true` the container will be stopped after the checkpoint is complete,
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the default is to keep the container running.
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Example:
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```bash
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curl -s -XPOST localhost:8888/containers/redis/checkpoint/test1 -d '{
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"exit": false,
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"tcp": false,
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"unixSockets": false,
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"shell": false
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}'
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```
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## List all checkpoints for a container
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To list all checkpoints for a container send a `GET` request to the
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`/containers/{name}/checkpoint` endpoint.
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Example:
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```bash
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curl -s localhost:8888/containers/redis/checkpoint
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```
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Response:
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```json
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[
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{
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"name" : "test1",
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"unixSockets" : false,
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"tcp" : false,
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"shell" : false,
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"timestamp" : "2015-12-04T15:09:14.915868934-08:00"
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},
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{
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"name" : "test2",
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"tcp" : false,
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"unixSockets" : false,
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"shell" : false,
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"timestamp" : "2015-12-04T15:09:14.915868934-08:00"
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}
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]
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```
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## Delete a container's checkpoint
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To delete a container's checkpoint send a `DELETE` request to the
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`/containers/redis/checkpoint/{checkpointname}` endpoint.
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Example:
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```bash
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curl -XDELETE -s localhost:8888/containers/redis/checkpoint/test1
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```
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## Update a container
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The update endpoint for a container accepts a JSON object with various fields
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for the actions you with to perform. To update a container send a `PATCH` request
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to the `/containers/{name}` endpoint.
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### Pause and resume a container
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To pause or resume a continer you want to send a `PATCH` request updating the container's state.
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Example:
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```bash
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# pause a container
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curl -XPATCH localhost:8888/containers/redis -d '{"status": "paused"}'
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# resume the container
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curl -XPATCH localhost:8888/containers/redis -d '{"status": "running"}'
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```
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### Signal the main process of a container
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To signal the main process of the container hit the same update endpoint with a different state.
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Example:
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```bash
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curl -s -XPATCH localhost:8888/containers/redis -d '{"signal": 9}'
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```
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