Table of Contents
- YANG Development Kit (Python)
- Backward Compatibility
- System Requirements
- How to install
- Documentation and Support
- Release Notes
The YANG Development Kit (YDK) is a Software Development Kit that provides API's that are modeled in YANG. The main goal of YDK is to reduce the learning curve of YANG data models by expressing the model semantics in an API and abstracting protocol/encoding details. YDK is composed of a core package that defines services and providers, plus one or more module bundles that are based on YANG models.
The Python YDK-0.8.4 core package is compatible with all model bundles generated previously with ydk-gen releases starting from 0.7.3. Please see the release notes for details.
A docker image is automatically built with the latest ydk-py installed. This be used to run ydk-py without installing anything natively on your machine.
docker run -it ydkdev/ydk-py
The following packages must be present in your system before installing YDK-Py:
# Install Third-party software sudo apt-get install gdebi-core python3-dev python-dev libtool-bin sudo apt-get install libcurl4-openssl-dev libpcre3-dev libssh-dev libxml2-dev libxslt1-dev cmake
Download and install YDK core library libydk. You can install the library using prebuilt debian packages for Xenial and Bionic LTS distributions. For other Ubuntu distributions it is recommended to build core library from source.
For Xenial (Ubuntu 16.04.4):
# Upgrade compiler to gcc 5.* sudo apt-get install gcc-5 g++-5 -y > /dev/null sudo ln -sf /usr/bin/gcc-5 /usr/bin/cc sudo ln -sf /usr/bin/g++-5 /usr/bin/c++ wget https://devhub.cisco.com/artifactory/debian-ydk/0.8.4/xenial/libydk-0.8.4-1.amd64.deb sudo gdebi libydk-0.8.4-1.amd64.deb
For Bionic (Ubuntu 18.04.1):
wget https://devhub.cisco.com/artifactory/debian-ydk/0.8.4/bionic/libydk-0.8.4-1.amd64.deb sudo gdebi libydk-0.8.4-1.amd64.deb
The following packages must be present in your system before installing YDK-Py. Currently, only Centos7/RHEL7 are known to work:
# Install Third-party software sudo yum install epel-release sudo yum install libssh-devel gcc-c++ python-devel python3-devel # Upgrade compiler to gcc 5.* sudo yum install centos-release-scl -y > /dev/null sudo yum install devtoolset-4-gcc* -y > /dev/null sudo ln -sf /opt/rh/devtoolset-4/root/usr/bin/gcc /usr/bin/cc sudo ln -sf /opt/rh/devtoolset-4/root/usr/bin/g++ /usr/bin/c++ # Install YDK core library sudo yum install https://devhub.cisco.com/artifactory/rpm-ydk/0.8.4/libydk-0.8.4-1.x86_64.rpm
It is required to install Xcode command line tools, homebrew and the following homebrew packages on your system before installing YDK-Py:
xcode-select --install /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" brew install pkg-config libssh xml2 libxml2 curl pcre cmake pybind11 doxygen libgcrypt curl -O https://devhub.cisco.com/artifactory/osx-ydk/0.8.4/libydk-0.8.4-Darwin.pkg sudo installer -pkg libydk-0.8.4-Darwin.pkg -target /
The libssh-0.8.0 does not support separate threading library, which is required for YDK. If after installation of libssh package the libssh_threads.a is missing, please downgrade the installation to libssh-0.7.6, or upgrade to libssh-0.8.1 or higher.
Note for MacOS Before installing libssh make sure the environment for openssl is setup:
brew reinstall openssl export OPENSSL_ROOT_DIR=/usr/local/opt/openssl
Download libssh-0.7.6 source code, compile it and install:
wget https://git.libssh.org/projects/libssh.git/snapshot/libssh-0.7.6.tar.gz tar zxf libssh-0.7.6.tar.gz && rm -f libssh-0.7.6.tar.gz mkdir libssh-0.7.6/build && cd libssh-0.7.6/build cmake .. sudo make install
In order to enable YDK support for gNMI protocol, which is optional, the following third party software must be installed prior to gNMI YDK component installation.
wget https://github.com/google/protobuf/releases/download/v3.5.0/protobuf-cpp-3.5.0.zip unzip protobuf-cpp-3.5.0.zip cd protobuf-3.5.0 ./configure make sudo make install sudo ldconfig
git clone -b v1.9.1 https://github.com/grpc/grpc cd grpc git submodule update --init make sudo make install sudo ldconfig
For Xenial (Ubuntu 16.04.4):
wget https://devhub.cisco.com/artifactory/debian-ydk/0.8.4/xenial/libydk_gnmi-0.4.0-4.amd64.deb sudo gdebi libydk_gnmi-0.4.0-4.amd64.deb
For Bionic (Ubuntu 18.04.1):
wget https://devhub.cisco.com/artifactory/debian-ydk/0.8.4/bionic/libydk_gnmi-0.4.0-4.amd64.deb sudo gdebi libydk_gnmi-0.4.0-4.amd64.deb
sudo yum install https://devhub.cisco.com/artifactory/rpm-ydk/0.8.4/libydk_gnmi-0.4.0-4.x86_64.rpm
curl -O https://devhub.cisco.com/artifactory/osx-ydk/0.8.4/libydk_gnmi-0.4.0-4.Darwin.pkg sudo installer -pkg libydk_gnmi-0.4.0-4.Darwin.pkg -target /
There is an open issue with gRPC on Centos/Fedora, which requires an extra step before running any YDK gNMI application. See this issue on GRPC GitHub for details. As a workaround, the YDK based application runtime environment must include setting of LD_LIBRARY_PATH variable:
PROTO="/Your-Protobuf-and-Grpc-installation-directory" export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PROTO/grpc/libs/opt:$PROTO/protobuf-3.5.0/src/.libs:/usr/local/lib64
YDK supports both Python2 and Python3 versions. At least Python2.7 or Python3.4 must be installed on your system.
It is also required for Python installation to include corresponding shared library. As example:
python2.7 - /usr/lib/x86_64-linux-gnu/libpython2.7.so python3.5m - /usr/lib/x86_64-linux-gnu/libpython3.5m.so
Please follow System Requirements to assure presence of shared Python libraries.
If you choose to install Python from source (need specific version), please include --enable-shared flag in configure command to include build of shared library:
cd Python3.4.1 ./configure --prefix=/opt/python --enable-shared make make install
Here the /opt/python is your Python installation directory. If installation directory is different from the system path, you need to configure CMAKE_LIBRARY_PATH environment variable to assure that cmake uses correct Python library:
Run pip install ydk command with -v option and in the console output note location of found PythonLibs. Make sure it matches with your installed Pyton dynamic library location:
-- Found PythonLibs: /opt/python/lib/libpython3.4m.so
In some OS configurations during YDK package installation the cmake fails to find C/C++ headers for previously installed YDK libraries. In this case the header location must be specified explicitly (in below commands the default location is shown):
export C_INCLUDE_PATH=/usr/local/include export CPLUS_INCLUDE_PATH=/usr/local/include
The developers of Python2 on Mac OS might face an installation issue. This is well known and documented issue. Each developer might have different approaches for its resolution. One of them is to use Python2 virtual environment. See section Using Python virtual environment for details.
In addition it is required properly set CMAKE_LIBRARY_PATH environment variable to assure that cmake uses correct Python library. Follow these steps to find and set correct library path.
- Find installations of libpython2.7 library:
locate libpython2.7.dylib /System/Library/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config/libpython2.7.dylib /usr/lib/libpython2.7.dylib /usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib /usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config/libpython2.7.dylib
- Choose non-system Python library installation and set CMAKE_LIBRARY_PATH before any YDK component installation. Example:
- Run YDK core package installation with '-v' flag to check that PythonLibs points to correct library path. Example:
$ ./generate.py --core $ pip install -v gen-api/python/ydk/dist/ydk*.tar.gz
- In 'cmake' log look for 'PythonLibs' and 'found version' settings line:
-- Found PythonLibs: /usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib (found version "2.7.15")
- Finally test you YDK core library installation from CLI, making sure there are no errors:
$ python -c "import ydk.types"
You may want to perform the installation under Python virtual environment (virtualenv/virtualenvwrapper). The virtual environment allows you to install multiple versions of YDK if needed. In addition, it prevents any potential conflicts between package dependencies in your system.
To install virtual environment support in your system, execute:
pip install virtualenv virtualenvwrapper source /usr/local/bin/virtualenvwrapper.sh
To create and activate new virtual environment:
mkvirtualenv -p python2.7 ydk-py
To activate existing virtual environment:
To exit virtual environment:
Once Python virtual environment is activated, you can perform quick installation or installation from source described above. Take into consideration that you must not attempt to install YDK as root user under virtual environment.
You can install the latest model packages from the Python package index. Note that, in some systems, you need to install the new package as root.
You get a fully operational YDK environment by installing the
cisco-ios-xe bundle(s) (depending on whether you're developing for an IOS XR or IOS XE platform),
which automatically installs all other YDK-related packages (
pip install ydk-models-cisco-ios-xr pip install ydk-models-cisco-ios-xe
Alternatively, you can perform a partial installation. If you only want to install the
openconfig bundle and its dependencies (
ietf packages), execute:
pip install ydk-models-openconfig
If you only want to install the
ietf bundle and its dependencies (
ydk package), execute:
pip install ydk-models-ietf
To installation of model bundles on CentOS/RedHat platforms require special handling; please follow the below steps.
pip install ydk pip install --install-option="--install-purelib=/usr/lib64/python2.7/site-packages" --no-deps ydk-models-ietf pip install --install-option="--install-purelib=/usr/lib64/python2.7/site-packages" --no-deps ydk-models-openconfig pip install --install-option="--install-purelib=/usr/lib64/python2.7/site-packages" --no-deps ydk-models-cisco-ios-xr pip install --install-option="--install-purelib=/usr/lib64/python2.7/site-packages" --no-deps ydk-models-cisco-ios-xe
pip install ydk pip install --install-option="--install-purelib=/usr/lib64/python3.4/site-packages" --no-deps ydk-models-ietf pip install --install-option="--install-purelib=/usr/lib64/python3.4/site-packages" --no-deps ydk-models-openconfig pip install --install-option="--install-purelib=/usr/lib64/python3.4/site-packages" --no-deps ydk-models-cisco-ios-xr pip install --install-option="--install-purelib=/usr/lib64/python3.4/site-packages" --no-deps ydk-models-cisco-ios-xe
pip install ydk pip install --install-option="--install-purelib=/usr/lib64/python3.6/site-packages" --no-deps ydk-models-ietf pip install --install-option="--install-purelib=/usr/lib64/python3.6/site-packages" --no-deps ydk-models-openconfig pip install --install-option="--install-purelib=/usr/lib64/python3.6/site-packages" --no-deps ydk-models-cisco-ios-xr pip install --install-option="--install-purelib=/usr/lib64/python3.6/site-packages" --no-deps ydk-models-cisco-ios-xe
If you prefer not to use the YDK packages in the Python package index, you need to install manually the
ydk core package and then the model bundles you plan to use.
To install the
ydk core package, execute:
$ cd core core$ python setup.py sdist core$ pip install dist/ydk*.gz
Once you have installed the
ydk core package, you can install one more model bundles. Note that some bundles have dependencies on other bundles.
Those dependencies are already captured in the bundle package. Make sure you install the desired bundles in the order below. To install the
ietf bundle, execute:
core$ cd ../ietf ietf$ python setup.py sdist ietf$ pip install dist/ydk*.gz
To install the
openconfig bundle, execute:
ietf$ cd ../openconfig openconfig$ python setup.py sdist openconfig$ pip install dist/ydk*.gz
To install the
cisco-ios-xr bundle, execute:
openconfig$ cd ../cisco-ios-xr cisco-ios-xr$ python setup.py sdist cisco-ios-xr$ pip install dist/ydk*.gz cisco-ios-xr$ cd ..
- Read the API documentation for details on how to use the API and specific models
- Samples can be found under the samples directory
- Hundreds of additional samples can be found in the YDK-PY samples repository
- Join the YDK community to connect with other users and with the makers of YDK
- Additional YDK information can be found at ydk.io
The current YDK release version is 0.8.4. YDK-Py is licensed under the Apache 2.0 License.