By Yi Xian
This article shows the new feature of the Fun tool and fun install, which can help you easily install apt and pip software packages. Also, through this, you can install these third-party dependencies to the system directory of Function Compute, developing Function Compute. But before we get to all the nitty gritty stuff of this article, let's first take a look at several important concepts mentioned in this article.
First, there's Function Compute, which is an event-driven service that allows users to write and upload code without having to manage server health or consider some other factors. Function Compute prepares and auto scales to the necessary amount of computing resources to run user code. The user only pays for the resources required to run their code.
Next, there's Fun, which is a deployment tool for serverless applications. It helps you manage resources, such as Function Compute, API Gateway, and Log Service. You can use Fun to develop, build, and deploy resources by describing specified resources in the
Last, there's also fun install, which is a sub-command of the Fun tool for installing pip and apt dependencies. It provides two forms, command line interface and
fun.yml description file.
Note: The tips described in this article require the Fun version 2.9.3 and later.
For Function Compute, installing third-party dependencies is a big pain point. However,
Fun install solidifies the best practices into tools based on previous experiences and achievements, which is convenient for users to install dependencies.
fun install init command to initialize a
fun.yml file in the current directory. This step is not necessary if you plan to write
fun.yml and run tasks in batches using the "fun install" command, init is a good start.
fun install init command in the root directory of the Function Compute project, and choose a runtime.
$ fun install init ? Select runtime (Use arrow keys) python2.7 python3 nodejs6 nodejs8 java8 php7.2
A fun.yml file is generated in the current directory. The content is as follows:
runtime: python2.7 tasks: 
The following command installs the Python TensorFlow package
$ fun install --runtime python2.7 --package-type pip tensorflow skip pulling image aliyunfc/runtime-python2.7:build-1.2.0... Task => [UNNAMED] => PYTHONUSERBASE=/code/.fun/python pip install --user tensorflow
Below is a description of the parameters in the above code script:
--runtimespecifies the runtime. If the fun.yml file has been initialized, this option can be omitted because the runtime is declared in the fun.yml.
--package-typespecifies the type of dependency to install. pip and apt are the current two optional values.
This command is run in the container provided by
fc-docker. The commands run inside the container are printed line by line. For example, the
PYTHONUSERBASE=/code/.fun/python pip install --user tensorflow command is actually run, too.
After the installation has complete, a .fun directory is generated, the runable files are placed in the
.fun/python/bin directory, and the library files are placed in the
.fun └── python ├── bin │ ├── freeze_graph │ ├── markdown_py │ ├── pbr │ ├── saved_model_cli │ ├── tensorboard │ ├── tflite_convert │ ├── toco │ └── toco_from_protos └── lib └── python2.7 └── site-packages ├── tensorboard ├── tensorboard-1.12.2.dist-info ├── tensorflow ├── tensorflow-1.12.0.dist-info ├── termcolor-1.1.0.dist-info ...
Compared with the previous
pip install -t . <package-name> method, the storage location of installed files for the "fun install" command is more organized, and the dependency files and code files are separated, which is convenient to clean up, and initialize the dependency files with OSS or NAS after splitting. However, this also brings a new issue, which is that it requires the user to customize the environment variable library file before it can be found by the program. For the convenience of users, the
fun install env is provided to print the necessary environment variables.
$ fun install env LD_LIBRARY_PATH=/code/.fun/root/usr/lib/x86_64-linux-gnu:/code:/code/lib:/usr/local/lib PATH=/code/.fun/root/usr/local/bin:/code/.fun/root/usr/local/sbin:/code/.fun/root/usr/bin:/code/.fun/root/usr/sbin:/code/.fun/root/sbin:/code/.fun/root/bin:/code/.fun/python/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/sbin:/bin PYTHONUSERBASE=/code/.fun/python
If you use
fun local and
fun deploy for debugging and deployment, you do not need to worry about environment variables, which have been set up for you.
--save parameter is added to the install command, the command is persisted as a task, and saved to the
$ fun install --runtime python2.7 --package-type pip --save tensorflow skip pulling image aliyunfc/runtime-python2.7:build-1.2.0... Task => [UNNAMED] => PYTHONUSERBASE=/code/.fun/python pip install --user tensorflow
--save parameter is added to the above command, check the contents of
runtime: python2.7 tasks: - pip: tensorflow local: true
Then, directly run
fun install without parameters to run the tasks in sequence.
$ fun install skip pulling image aliyunfc/runtime-python2.7:build-1.2.0... Task => [UNNAMED] => PYTHONUSERBASE=/code/.fun/python pip install --user tensorflow
$ fun install -v skip pulling image aliyunfc/runtime-python3.6:build-1.2.0... Task => [UNNAMED] => apt-get update (if need) Ign http://mirrors.aliyun.com stretch InRelease Get:1 http://mirrors.aliyun.com stretch-updates InRelease [91.0 kB] Get:2 http://mirrors.aliyun.com stretch-backports InRelease [91.8 kB] Get:3 http://mirrors.aliyun.com stretch/updates InRelease [94.3 kB] Hit http://mirrors.aliyun.com stretch Release.gpg Hit http://mirrors.aliyun.com stretch Release Get:4 http://mirrors.aliyun.com stretch-updates/main Sources [3911 B] ....
For Function Compute, using
apt-get to install dependencies is another common installation problem. The
fun install command can also be used for installation purposes.
$ fun install --runtime python3 --package-type apt libzbar0 skip pulling image aliyunfc/runtime-python3.6:build-1.2.0... Task => [UNNAMED] => apt-get update (if need) => apt-get install -y -d -o=dir::cache=/code/.fun/tmp libzbar0 => bash -c 'for f in $(ls /code/.fun/tmp/archives/*.deb); do dpkg -x $f /code/.fun/root; done;' => bash -c 'rm -rf /code/.fun/tmp/archives'
The usage method and its parameters of this command are similar to that of the pip package dependency. You only need to set
apt, and the package name to the deb package name that can be installed by apt-get.
fun.yml is composed of a group of tasks. When you run the
fun install command, tasks are executed in sequence to achieve batch installation.
The file format of
fun.yml is as follows:
runtime: python3 tasks: - name: install libzbar0 apt: libzbar0 local: true - name install Pillow by pip pip: Pillow local: true - name: just test shell task shell: echo '111' > 1.txt
runtime field is required. Currently, three types of tasks are available: apt, pip, and shell. The fun.yml file is stored in the directory to which the function
codeUri in the
template.yml file pointed. If multiple functions are declared in the
template.yml and stored in different
codeUri directories, multiple
fun.yml files need to be created.
name field of all tasks is optional. If the
name field is not entered, the output is as follows:
Task => [UNNAMED]
The tasks of apt and pip type are subtypes of
install tasks. The description format is similar to the following:
name: install libzbar0 apt: libzbar0 local: true
The preceding task description is equivalent to the following command:
fun install --package-type apt libzbar0
During installation using
fun install, use the
--save parameter to generate the description structure of the above task in the
fun.yml file of the current directory.
local field defaults to
true, indicating that the dependency will be installed in the
.fun subdirectory of the current directory, and will be packed together in the zip package. Set it to
false to install the dependency into the system directory. This is generally used to compile the dependency. For example, if an execution file or library is required at compile or build time but not at run time, then
local: false can be set, so that the file will be ignored during packaging, and the file size of the final zip package will not be affected.
shell tasks are designed for source code-based installation scenarios.
name: install from source shell: ./autogen.sh --disable-report-builder --disable-lpsolve --disable-coinmp
The following is an example of python3 implementing the deployment of a simple QR code identification program to Function Compute. In this example, the
pip pyzbar library is used to identify the QR code. The
pyzbar library relies on the
libzbar0 library installed by apt-get. The pip Pillow library is required to load images. The
fun.yml file is described as follows:
runtime: python3 tasks: - apt: libzbar0 local: true - pip: Pillow local: true - pip: pyzbar local: true
fun install to install dependencies
$ fun install skip pulling image aliyunfc/runtime-python3.6:build-1.2.0... Task => [UNNAMED] => apt-get update (if need) => apt-get install -y -d -o=dir::cache=/code/.fun/tmp libzbar0 => bash -c 'for f in $(ls /code/.fun/tmp/archives/*.deb); do dpkg -x $f /code/.fun/root; done;' => bash -c 'rm -rf /code/.fun/tmp/archives' Task => [UNNAMED] => PYTHONUSERBASE=/code/.fun/python pip install --user Pillow Task => [UNNAMED] => PYTHONUSERBASE=/code/.fun/python pip install --user pyzbar
The content of the template.yml file is as follows:
ROSTemplateFormatVersion: '2015-09-01' Transform: 'Aliyun::Serverless-2018-04-03' Resources: pyzbar-srv: Type: 'Aliyun::Serverless::Service' pyzbar-fun: Type: 'Aliyun::Serverless::Function' Properties: Handler: index.handler Runtime: python3 Timeout: 60 MemorySize: 128 CodeUri: .
The content of the
index.py file is as follows:
from pyzbar.pyzbar import decode from pyzbar.pyzbar import ZBarSymbol from PIL import Image def handler(event, context): img = Image.open('./qrcode.png') return decode(img, symbols=[ZBarSymbol.QRCODE]).data
fun local to execute locally
fun local invoke pyzbar-fun skip pulling image aliyunfc/runtime-python3.6:1.2.0... Thalassiodracon RequestId: 964980d1-1f1b-4f91-bfd8-eadd26a307b3 Billed Duration: 630 ms Memory Size: 1998 MB Max Memory Used: 32 MB
Thalassiodracon is the output result after identification.
This article introduces a new feature of the Fun tool, fun install, which allows you to easily install apt and pip software packages. For engineering requirements of multiple installations, you can consider persisting the installation steps as the
fun.yml file. The
fun.yml file provides more features than the command line, and shell tasks can be written to support source code installation. The dependency can be installed to the system directory by setting local: false to deal with the situation of compiling dependency instead of running dependency.
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