Metadata-Version: 2.1
Name: containerd
Version: 1.4.2
Summary: containerd API for Python
Home-page: https://github.com/siemens/pycontainerd
Author: Silvano Cirujano Cuesta
Author-email: silvano.cirujano-cuesta@siemens.com
License: Apache-2.0
Description: # containerd API Python package
        
        This repository provides a Python3 API to [containerd's](https://containerd.io)
        (gRPC) API, directly generated from the [original containerd `.proto` API
        definitions](https://github.com/containerd/containerd/tree/master/api). As it is
        generated from the protocol files, this Python package does not aim to be a
        fully Pythonesque package. In consequence, the usual idiosyncrasies of gRPC and
        protoc shine through.
        
        > **Note:** with Python2 going end-of-life in January 2020 we don't support
        > Python2 in this package at this very late time in the lifecycle.
        
        ## Versioning
        
        The versioning of this package complies with [PEP
        440](https://www.python.org/dev/peps/pep-0440/).
        
        The version is composed of the version of the supported containerd API (e.g. 1.2
        or 1.3) and an incremental number for each pycontainerd release for that
        specific containerd API version (starting from 0) connected with a '.' (a dot).
        
        Ideally the Python containerd API has to be generated only once per containerd
        API version, resulting in x.y.0 package versions.
        
        The result is version numbers like:
        
        - 1.2.1 for the second release for API 1.2
        - 1.3.0 for the first release for API 1.3
        
        ## License
        
        This project is licensed as [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0) (SPDX-License-Identifier: Apache-2.0).
        
        You can obtain the full license text from the file `License` of this repository.
        
        ## Install as Python Package
        
        Installation depends on your starting point:
        
        1. You have a `pycontainerd` Python Wheel package (something like
           `containerd-x.y.z-py3-none-any.whl`).
        2. You only have the source code (the result of cloning the git repository).
        
        ### Dependencies
        
        Python3 PIP is needed for Wheel installations (either from a ready Wheel package
        or from a self-built package). PIP takes care of installing all the Python
        packages listed as dependencies. Runtime dependencies are nevertheless listed
        below.
        
        ### Installation from Wheel package
        
        Go to the directory where the wheel package is available and run:
        
        ```bash
        sudo pip3 install containerd-<x.y.z>-py3-none-any.whl
        ```
        
        Being `containerd-<x.y.z>-py3-none-any.whl` the filename of the wheel package.
        
        > *NOTE*: a global installation is required (or rather, more convenient) because
        the `containerd` API socket is usually only reachable for `root`.
        
        ### Installation from source code
        
        Additionally, if building from source code you'll also need `make`.
        
        A Makefile is being provided that takes care of
        
        1. Building the Wheel package
        2. Installing the Wheel package
        
        Get into the directory corresponding the API version of your containerd installation and run following:
        
        ```bash
        make install
        ```
        
        The second step is under the hood simply running the installation of the wheel
        package explained above. Including the global installation, therefore a `sudo`
        execution is asking for the user's password (assuming the user has that right).
        
        ## Package Structure and Usage
        
        The resulting Wheel package provides following Python packages (they have to be
        imported individually), providing multiple modules:
        
        - containerd.events
        - containerd.services.containers.v1
        - containerd.services.content.v1
        - containerd.services.diff.v1
        - containerd.services.events.v1
        - containerd.services.images.v1
        - containerd.services.introspection.v1
        - containerd.services.leases.v1
        - containerd.services.namespaces.v1
        - containerd.services.snapshots.v1
        - containerd.services.tasks.v1
        - containerd.services.version.v1
        - containerd.types
        - containerd.types.tasks
        - containerd.protobuf (_note: this is not a protobuf alias_)
        - containerd.vendor.gogoproto
        
        In order to get the modules being provided by a package you can run:
        
        ```bash
        python3 -c 'import <package> ; help(<package>)'
        ```
        
        For example, for `containerd.events`:
        
        ```bash
        python3 -c 'import containerd.events ; help(containerd.events)'
        ```
        
        ## Examples
        
        ### List All Namespaces
        
        The following simple example queries containerd for its list of available
        containerd namespaces. Make sure you have the necessary privileges to connect to
        containerd; you may need to run this script as root:
        
        ```python
        import grpc
        from containerd.services.namespaces.v1 import namespace_pb2_grpc, namespace_pb2
        
        with grpc.insecure_channel('unix:///run/containerd/containerd.sock') as channel:
            namespacev1 = namespace_pb2_grpc.NamespacesStub(channel)
            namespaces = namespacev1.List(namespace_pb2.ListNamespacesRequest()).namespaces
            for namespace in namespaces:
                print('namespace:', namespace.name)
        ```
        
        Usually, you want to add proper error handling. This is just a very simplistic
        example to illustrate the principle.
        
        ### List Containers in a Specific Namespace
        
        Several of containerd's APIs are namespaced. That is, they work only on a single
        namespace at a time. The namespace applies on the level of individual service
        calls and needs to be specified as an (additional) metadata element to these
        calls. If not specified, it the namespace will default to the namespace named
        `default`. The following example lists all containers in the `"moby"` namespace;
        this is the containerd namespace used by Docker.
        
        ```python
        import grpc
        from containerd.services.containers.v1 import containers_pb2_grpc, containers_pb2
        
        with grpc.insecure_channel('unix:///run/containerd/containerd.sock') as channel:
            containersv1 = containers_pb2_grpc.ContainersStub(channel)
            containers = containersv1.List(
                containers_pb2.ListContainersRequest(),
                metadata=(('containerd-namespace', 'moby'),)).containers
            for container in containers:
                print('container ID:', container.id)
        ```
        
        ### Watch containerd Events Flowing
        
        Containerd events can be easily read from the endless event stream via the
        `containerd.services.events.v1` API, using the `Subscribe` service. The
        following example subscribes to all events and then prints their type and
        contents as the events come:
        
        ```python
        import grpc
        
        from containerd.services.events.v1 import unwrap, events_pb2, events_pb2_grpc
        from google.protobuf import any_pb2
        
        with grpc.insecure_channel('unix:///run/containerd/containerd.sock') as channel:
            print("waiting for containerd events...")
            eventsv1 = events_pb2_grpc.EventsStub(channel)
            for ev in eventsv1.Subscribe(events_pb2.SubscribeRequest()):
                print('event type: ', ev.event.type_url)
                print('value: ', unwrap(ev))
        ```
        
        > **Note:** `containerd.services.events.v1.unwrap(envelope)` is a convenience
        > function which unwraps the event object inside an event envelope returned by
        > `Subscribe()`: the unwrapped event object is returned as a Python object of
        > sub class `containerd.events.*` (as opposed to the arbitrary "any" binary
        > value inside the event envelope).
        
        ## Executable Programs
        
        To help containerd client developers getting started, we've included two simple
        examples which are also made available as the CLI programs `lsctr` and
        `watchctr` (source code in `examples/`) when cloning the repository.
        
        You first have to install the wheel package for the `containerd` package.
        
        - `lsctr` lists all containerd containers in all namespaces. It is basically
          kind of an all-in-one combination of the `ctr` commands for namespaces,
          containers, and tasks in a single command.
        - `watchctr` watches containerd events, such as container creation, start, stop,
          et cetera, and then prints them to the terminal.
        
        To check that it works, run the `lsctr` command: this should list all available
        containerd containers, across all containerd namespaces (remember to use `sudo`
        in case you don't have the necessary privileges as an ordinary user to talk to
        containerd):
        
        ```bash
        sudo lsctr
        ```
        
        This should spit out something like this, when running on a recent Docker CE
        installation, which uses containerd under the hood:
        
        ```txt
        moby
          ⤏ labels (0):
          ▩ container: 0eeb9e2862e9f68e832a2e2c60a2e44e74d54b05266532cf19b112f4d959e3fb
            ▷ PID: 3359 ⚐ status: RUNNING
            ⚙ runtime: io.containerd.runtime.v1.linux
            ⤏ labels (1):
                "com.docker/engine.bundle.path": "/var/run/docker/containerd/0eeb9e2862e9f68e832a2e2c60a2e44e74d54b05266532cf19b112f4d959e3fb"
            ◷ created: 2019-09-04 07:24:32.646856 ◷ updated: 2019-09-04 07:24:32.646856
          ▩ container: 1663afd0ddc6e0bba30b7fcc27b26044ece6022d970e32731db5dcb807b168df
            ▷ PID: 66062 ⚐ status: RUNNING
            ⚙ runtime: io.containerd.runtime.v1.linux
            ⤏ labels (1):
                "com.docker/engine.bundle.path": "/var/run/docker/containerd/1663afd0ddc6e0bba30b7fcc27b26044ece6022d970e32731db5dcb807b168df"
            ◷ created: 2019-08-16 08:08:21.471493 ◷ updated: 2019-08-16 08:08:21.471493
        ...
        ```
        
        You can use `lsctr -h` to see the few CLI options available.
        
        ## Package Requirements
        
        The following Python packages are required:
        
        - [`grpcio`](https://pypi.org/project/grpcio/) – gRPC for Python; required in
          order to communicate with containerd. This is a runtime dependency.
        - [`protobuf`](https://pypi.org/project/protobuf/) – protobuf for Python;
          required in order to communicate with containerd. This is a runtime
          dependency.
        - (optional) `grpcio-tools` – only required when re-generating the containerd
          API Python code using `genpb2.sh`.
        
        ## Python ContainerD API
        
        ### API Package (Re)Generation
        
        In case you need to regenerate or update the Python code for the containerd API,
        in the top-level directory of this repository, run:
        
        ```bash
        ./genpb2.sh
        ```
        
        Normally, you should not need to regenerate the grpc/pb2 Python modules unless
        you are a project contributor or maintainer.
        
        ### Project Organization
        
        The overall directory structure of the Python containerd API package is as
        follows (inside the `api_1.x/` directories):
        
        - `containerd/` contains the Python modules generated by protoc as well as a
          very few hand-made modules. In order to avoid polluting the top-level package
          namespace with proto dependencies, `genpb2.sh` "vendorizes" dependencies only
          for such `.proto` files for which no PyPI packages are available, moving such
          dependencies inside the `containerd` top-level Python package namespace.
          - `services/` contains the containerd service API v1.
          - `events/` contains the containerd event definitions.
          - `types/` contains containerd type definitions required by services and
            events.
          - `protobuf/` internal dependency.
          - `vendor/` contains the "vendorized" dependencies.
            - `gogoproto/` modules not available as a PyPI package.
        - `genpb2.sh` is a script to recreate or update the `_pb2.py` and `_pb2_grpc.py`
          Python modules from the containerd API `.proto` file definitions and
          dependencies. See `genpb2.sh` for more information on its workings.
        
        ## Survival References
        
        - [gRPC Basics – Python](https://grpc.io/docs/tutorials/basic/python/).
        - [Protocol Buffers Python Reference: Python Generated
          Code](https://developers.google.com/protocol-buffers/docs/reference/python-generated).
        - [containerd API protocol
          definitions](https://github.com/containerd/containerd/tree/master/api).
        
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Operating System :: POSIX :: Linux
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3 :: Only
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: System :: Clustering
Classifier: Topic :: Utilities
Description-Content-Type: text/markdown
