Automated testing and deployment of a simple Flask-based (RESTful) micro-service to a production-like environment on AWS, using Docker containers and Travis-CI.

AlexIoannides, updated 🕥 2023-02-02 04:07:05

Automated Testing and Deployment of a Python Micro-service to AWS, using Docker, Boto3 and Travis-CI

The purpose of this project is to demonstrate how to automate the testing and deployment of a simple Flask-based (RESTful) micro-service to a production-like environment on AWS. The deployment pipeline is handled by Travis-CI, that has been granted access to this GitHub repository and configured to run upon a pull request or a merge to the master branch. The pipeline is defined in the .travis.yaml file and consists of the following steps:

define which Python version to use;
install the Pipenv package using pip;
use Pipenv to install the project dependencies defined in Pipfile.lock;
run unit tests by executing pipenv run python -m unittest tests/*.py; and,
if on the master branch - e.g. if a pull request has been merged - then start Docker and run the deploy_to_aws.py script.

The deploy_to_aws.py script defines the deployment process, which performs the following steps without any manual intervention:

build the required Docker image;
pushe the image to AWS's Elastic Container Registry (ECR); and,
trigger a rolling redeployment of the service across an Elastic Container Service (ECS) cluster.

It is reliant on the definition of three environment variables: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, and AWS_REGION. For security reasons, these are kept out of the .travis.yml and are instead defined using the Travis-CI UI.

Although the micro-service used in this example - as defined in microservice/api.py module - only returns a simple message upon a simple GET request, it could just as easily be a Machine Learning (ML) model-scoring service that receives the values of feature variables and returns a prediction - the overall pattern is the same.

Initial Configuration of AWS Infrastructure

Currently, the initial setup of the required AWS infrastructure is entirely manual (although this could also be scripted in the future). What's required, is an ECS cluster that is capable hosting multiple groups of Docker containers (or 'tasks' - i.e. web applications or in our case just a single micro-service), that sit behind a load balances that accepts incoming traffic and routes it to different containers in the cluster. Collectively,this constitutes a 'service' that is highly available. At a high-level, the steps required to setup this infrastructure using the AWS management console, are as follows (assuming the existence of a repository in ECR, containing our docker image):

create a new ECS cluster, in new VPC, using instance that are ~ t2.medium;
- when configuring the security group (firewall) for the cluster, consider allowing a rule for single IP to assist debugging (e.g. YOUR_LOCAL_IP_ADDRESS/32);
create a new application load balancer for new VPC;
- then create a custom security group for the load balancer (from the EC2 console), that allows anything from the outside world to pass;
modify ECS cluster's security group to allow the load balancer access, by explicitly referencing the security group for the load balancer, that we have just created;
create a new target group for the new VPC (from within the EC2 console under the 'Load Balancers' section), which we will eventually point the load balancer to;
- there is no need to add the instances from the ECS cluster in this step, as this will he handled automatically when creating the service;
- modify the health check path to /microservice, otherwise it won't get 200s and and will try to re-register hosts;
create a new task in ECS;
- for the sake of simplicity, choose daemon mode - i.e. assume there is only one container per-task;
- when adding the container for the task, be sure to reference the Docker image uploaded to ECR;
create a new service for our ECS cluster;
- referencing the task, load balancer and target group that we have created in the steps above.

Project Dependencies

We use pipenv for managing project dependencies and Python environments (i.e. virtual environments). All of the direct packages dependencies required to run the code (e.g. docker and boto3), as well as all the packages used during development (e.g. IPython for interactive console sessions), are described in the Pipfile. Their precise downstream dependencies are described in Pipfile.lock.

Installing Pipenv

To get started with Pipenv, first of all download it - assuming that there is a global version of Python available on your system and on the PATH, then this can be achieved by running the following command,

bash pip3 install pipenv

Pipenv is also available to install from many non-Python package managers. For example, on OS X it can be installed using the Homebrew package manager, with the following terminal command,

bash brew install pipenv

For more information, including advanced configuration options, see the official pipenv documentation.

Installing this Projects' Dependencies

Make sure that you're in the project's root directory (the same one in which Pipfile resides), and then run,

bash pipenv install --dev

This will install all of the direct project dependencies as well as the development dependencies (the latter a consequence of the --dev flag).

Running Python and IPython from the Project's Virtual Environment

In order to continue development in a Python environment that precisely mimics the one the project was initially developed with, use Pipenv from the command line as follows,

bash pipenv run python3

The python3 command could just as well be ipython3 or the Jupyter notebook server, for example,

bash pipenv run jupyter notebook

This will fire-up a Jupyter notebook server where the default Python 3 kernel includes all of the direct and development project dependencies. This is how we advise that the notebooks within this project are used.

Running Unit Tests

All test have been written using the unittest package from the Python standard library. Tests are kept in the tests folder and can be run from the command line by - e.g. by evoking,

bash pipenv run python -m unittest tests/test_*.py

Starting the Micro-service Locally

This can be started via the command line, from the root directory using,

bash pipenv run python -m microservice.api

Which will start the server at http://localhost:5000/microservice.

Issues

Bump werkzeug from 0.14.1 to 0.15.5

opened on 2023-02-02 04:07:00 by dependabot[bot]

Bumps werkzeug from 0.14.1 to 0.15.5.

Release notes

Sourced from werkzeug's releases.

0.15.5

Changelog: http://werkzeug.palletsprojects.com/en/0.15.x/changes/#version-0-15-5

0.15.4

Blog: https://palletsprojects.com/blog/werkzeug-0-15-3-released/

Changes: https://werkzeug.palletsprojects.com/en/0.15.x/changes/#version-0-15-4

0.15.3

Blog: https://palletsprojects.com/blog/werkzeug-0-15-3-released/

Changes: https://werkzeug.palletsprojects.com/en/0.15.x/changes/#version-0-15-3

0.15.2

Blog: https://palletsprojects.com/blog/werkzeug-0-15-2-released/

Changes: https://werkzeug.palletsprojects.com/en/0.15.x/changes/#version-0-15-2

0.15.1

Blog: https://palletsprojects.com/blog/werkzeug-0-15-1-released/

Changes: https://werkzeug.palletsprojects.com/en/0.15.x/changes/

0.15.0

Blog: https://palletsprojects.com/blog/werkzeug-0-15-0-released/

Changes: https://werkzeug.palletsprojects.com/en/0.15.x/changes/

Changelog

Sourced from werkzeug's changelog.

Version 0.15.5

Released 2019-07-17

Fix a TypeError due to changes to ast.Module in Python 3.8. :issue:1551

Fix a C assertion failure in debug builds of some Python 2.7 releases. :issue:1553

:class:~exceptions.BadRequestKeyError adds the KeyError message to the description if e.show_exception is set to True. This is a more secure default than the original 0.15.0 behavior and makes it easier to control without losing information. :pr:1592

Upgrade the debugger to jQuery 3.4.1. :issue:1581

Work around an issue in some external debuggers that caused the reloader to fail. :issue:1607

Work around an issue where the reloader couldn't introspect a setuptools script installed as an egg. :issue:1600

The reloader will use sys.executable even if the script is marked executable, reverting a behavior intended for NixOS introduced in 0.15. The reloader should no longer cause OSError: [Errno 8] Exec format error. :issue:1482, :issue:1580

SharedDataMiddleware safely handles paths with Windows drive names. :issue:1589

Version 0.15.4

Released 2019-05-14

Fix a SyntaxError on Python 2.7.5. (:issue:1544)

Version 0.15.3

Released 2019-05-14

Properly handle multi-line header folding in development server in Python 2.7. (:issue:1080)

Restore the response argument to :exc:~exceptions.Unauthorized. (:pr:1527)

:exc:~exceptions.Unauthorized doesn't add the WWW-Authenticate header if www_authenticate is not given. (:issue:1516)

The default URL converter correctly encodes bytes to string rather than representing them with b''. (:issue:1502)

Fix the filename format string in

... (truncated)

Commits

8cfab30 release version 0.15.5
d1f5fab update project links
726b25b Merge pull request #1613 from pallets/revert-nixos-reloader-check
1f532b8 don't detect executable file for reloader
a8d26bf Merge pull request #1612 from pallets/shared-data
acc999e SharedDataMiddleware uses safe_join
8afe4eb Merge pull request #1582 from Cerebus/fix/1581-jquery-3.4.1
e0de4a4 Merge pull request #1601 from pokoli/reloader_package
ec68771 update to jQuery 3.4.1
7a01660 explain reloader workaround for egg script
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Bump certifi from 2018.4.16 to 2022.12.7

opened on 2022-12-08 02:18:26 by dependabot[bot]

Bumps certifi from 2018.4.16 to 2022.12.7.

Commits

9e9e840 2022.12.07
b81bdb2 2022.09.24
939a28f 2022.09.14
aca828a 2022.06.15.2
de0eae1 Only use importlib.resources's new files() / Traversable API on Python ≥3.11 ...
b8eb5e9 2022.06.15.1
47fb7ab Fix deprecation warning on Python 3.11 (#199)
b0b48e0 fixes #198 -- update link in license
9d514b4 2022.06.15
4151e88 Add py.typed to MANIFEST.in to package in sdist (#196)
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Bump ipython from 6.4.0 to 7.16.3

opened on 2022-01-21 19:34:16 by dependabot[bot]

Bumps ipython from 6.4.0 to 7.16.3.

Commits

d43c7c7 release 7.16.3
5fa1e40 Merge pull request from GHSA-pq7m-3gw7-gq5x
8df8971 back to dev
9f477b7 release 7.16.2
138f266 bring back release helper from master branch
5aa3634 Merge pull request #13341 from meeseeksmachine/auto-backport-of-pr-13335-on-7...
bcae8e0 Backport PR #13335: What's new 7.16.2
8fcdcd3 Pin Jedi to <0.17.2.
2486838 release 7.16.1
20bdc6f fix conda build
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Bump urllib3 from 1.23 to 1.26.5

opened on 2021-06-01 22:34:24 by dependabot[bot]

Bumps urllib3 from 1.23 to 1.26.5.

Release notes

Sourced from urllib3's releases.

1.26.5

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed deprecation warnings emitted in Python 3.10.

Updated vendored six library to 1.16.0.

Improved performance of URL parser when splitting the authority component.

If you or your organization rely on urllib3 consider supporting us via GitHub Sponsors

1.26.4

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Changed behavior of the default SSLContext when connecting to HTTPS proxy during HTTPS requests. The default SSLContext now sets check_hostname=True.

If you or your organization rely on urllib3 consider supporting us via GitHub Sponsors

1.26.3

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed bytes and string comparison issue with headers (Pull #2141)

Changed ProxySchemeUnknown error message to be more actionable if the user supplies a proxy URL without a scheme (Pull #2107)

If you or your organization rely on urllib3 consider supporting us via GitHub Sponsors

1.26.2

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed an issue where wrap_socket and CERT_REQUIRED wouldn't be imported properly on Python 2.7.8 and earlier (Pull #2052)

1.26.1

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed an issue where two User-Agent headers would be sent if a User-Agent header key is passed as bytes (Pull #2047)

1.26.0

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Added support for HTTPS proxies contacting HTTPS servers (Pull #1923, Pull #1806)

Deprecated negotiating TLSv1 and TLSv1.1 by default. Users that still wish to use TLS earlier than 1.2 without a deprecation warning should opt-in explicitly by setting ssl_version=ssl.PROTOCOL_TLSv1_1 (Pull #2002) Starting in urllib3 v2.0: Connections that receive a DeprecationWarning will fail

Deprecated Retry options Retry.DEFAULT_METHOD_WHITELIST, Retry.DEFAULT_REDIRECT_HEADERS_BLACKLIST and Retry(method_whitelist=...) in favor of Retry.DEFAULT_ALLOWED_METHODS, Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT, and Retry(allowed_methods=...) (Pull #2000) Starting in urllib3 v2.0: Deprecated options will be removed

... (truncated)

Changelog

Sourced from urllib3's changelog.

1.26.5 (2021-05-26)

Fixed deprecation warnings emitted in Python 3.10.

Updated vendored six library to 1.16.0.

Improved performance of URL parser when splitting the authority component.

1.26.4 (2021-03-15)

Changed behavior of the default SSLContext when connecting to HTTPS proxy during HTTPS requests. The default SSLContext now sets check_hostname=True.

1.26.3 (2021-01-26)

Fixed bytes and string comparison issue with headers (Pull #2141)

Changed ProxySchemeUnknown error message to be more actionable if the user supplies a proxy URL without a scheme. (Pull #2107)

1.26.2 (2020-11-12)

Fixed an issue where wrap_socket and CERT_REQUIRED wouldn't be imported properly on Python 2.7.8 and earlier (Pull #2052)

1.26.1 (2020-11-11)

Fixed an issue where two User-Agent headers would be sent if a User-Agent header key is passed as bytes (Pull #2047)

1.26.0 (2020-11-10)

NOTE: urllib3 v2.0 will drop support for Python 2. Read more in the v2.0 Roadmap <https://urllib3.readthedocs.io/en/latest/v2-roadmap.html>_.

Added support for HTTPS proxies contacting HTTPS servers (Pull #1923, Pull #1806)

Deprecated negotiating TLSv1 and TLSv1.1 by default. Users that still wish to use TLS earlier than 1.2 without a deprecation warning

... (truncated)

Commits

d161647 Release 1.26.5
2d4a3fe Improve performance of sub-authority splitting in URL
2698537 Update vendored six to 1.16.0
07bed79 Fix deprecation warnings for Python 3.10 ssl module
d725a9b Add Python 3.10 to GitHub Actions
339ad34 Use pytest==6.2.4 on Python 3.10+
f271c9c Apply latest Black formatting
1884878 [1.26] Properly proxy EOF on the SSLTransport test suite
a891304 Release 1.26.4
8d65ea1 Merge pull request from GHSA-5phf-pp7p-vc2r
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Bump pygments from 2.2.0 to 2.7.4

opened on 2021-03-29 17:59:06 by dependabot[bot]

Bumps pygments from 2.2.0 to 2.7.4.

Release notes

Sourced from pygments's releases.

2.7.4

Updated lexers:

Apache configurations: Improve handling of malformed tags (#1656)

CSS: Add support for variables (#1633, #1666)

Crystal (#1650, #1670)

Coq (#1648)

Fortran: Add missing keywords (#1635, #1665)

Ini (#1624)

JavaScript and variants (#1647 -- missing regex flags, #1651)

Markdown (#1623, #1617)

Shell

Lex trailing whitespace as part of the prompt (#1645)

Add missing in keyword (#1652)

SQL - Fix keywords (#1668)

Typescript: Fix incorrect punctuation handling (#1510, #1511)

Fix infinite loop in SML lexer (#1625)

Fix backtracking string regexes in JavaScript/TypeScript, Modula2 and many other lexers (#1637)

Limit recursion with nesting Ruby heredocs (#1638)

Fix a few inefficient regexes for guessing lexers

Fix the raw token lexer handling of Unicode (#1616)

Revert a private API change in the HTML formatter (#1655) -- please note that private APIs remain subject to change!

Fix several exponential/cubic-complexity regexes found by Ben Caller/Doyensec (#1675)

Fix incorrect MATLAB example (#1582)

Thanks to Google's OSS-Fuzz project for finding many of these bugs.

2.7.3

Updated lexers:

Ada (#1581)

HTML (#1615, #1614)

Java (#1594, #1586)

JavaScript (#1605, #1589, #1588)

JSON (#1569 -- this is a complete rewrite)

Lean (#1601)

LLVM (#1612)

Mason (#1592)

MySQL (#1555, #1551)

Rust (#1608)

Turtle (#1590, #1553)

Deprecated JsonBareObjectLexer, which is now identical to JsonLexer (#1600)

The ImgFormatter now calculates the exact character width, which fixes some issues with overlapping text (#1213, #1611)

... (truncated)

Changelog

Sourced from pygments's changelog.

Version 2.7.4

(released January 12, 2021)

Updated lexers:

Apache configurations: Improve handling of malformed tags (#1656)

CSS: Add support for variables (#1633, #1666)

Crystal (#1650, #1670)

Coq (#1648)

Fortran: Add missing keywords (#1635, #1665)

Ini (#1624)

JavaScript and variants (#1647 -- missing regex flags, #1651)

Markdown (#1623, #1617)

Shell

Lex trailing whitespace as part of the prompt (#1645)

Add missing in keyword (#1652)

SQL - Fix keywords (#1668)

Typescript: Fix incorrect punctuation handling (#1510, #1511)

Fix infinite loop in SML lexer (#1625)

Fix backtracking string regexes in JavaScript/TypeScript, Modula2 and many other lexers (#1637)

Limit recursion with nesting Ruby heredocs (#1638)

Fix a few inefficient regexes for guessing lexers

Fix the raw token lexer handling of Unicode (#1616)

Revert a private API change in the HTML formatter (#1655) -- please note that private APIs remain subject to change!

Fix several exponential/cubic-complexity regexes found by Ben Caller/Doyensec (#1675)

Fix incorrect MATLAB example (#1582)

Thanks to Google's OSS-Fuzz project for finding many of these bugs.

Version 2.7.3

(released December 6, 2020)

Updated lexers:

Ada (#1581)

HTML (#1615, #1614)

Java (#1594, #1586)

JavaScript (#1605, #1589, #1588)

JSON (#1569 -- this is a complete rewrite)

Lean (#1601)

LLVM (#1612)

Mason (#1592)

... (truncated)

Commits

4d555d0 Bump version to 2.7.4.
fc3b05d Update CHANGES.
ad21935 Revert "Added dracula theme style (#1636)"
e411506 Prepare for 2.7.4 release.
275e34d doc: remove Perl 6 ref
2e7e8c4 Fix several exponential/cubic complexity regexes found by Ben Caller/Doyensec
eb39c43 xquery: fix pop from empty stack
2738778 fix coding style in test_analyzer_lexer
02e0f09 Added 'ERROR STOP' to fortran.py keywords. (#1665)
c83fe48 support added for css variables (#1633)
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Bump jinja2 from 2.10 to 2.11.3

opened on 2021-03-19 23:42:16 by dependabot[bot]

Bumps jinja2 from 2.10 to 2.11.3.

Release notes

Sourced from jinja2's releases.

2.11.3

This contains a fix for a speed issue with the urlize filter. urlize is likely to be called on untrusted user input. For certain inputs some of the regular expressions used to parse the text could take a very long time due to backtracking. As part of the fix, the email matching became slightly stricter. The various speedups apply to urlize in general, not just the specific input cases.

PyPI: https://pypi.org/project/Jinja2/2.11.3/

Changes: https://jinja.palletsprojects.com/en/2.11.x/changelog/#version-2-11-3

2.11.2

Changelog: https://jinja.palletsprojects.com/en/2.11.x/changelog/#version-2-11-2

2.11.1

This fixes an issue in async environment when indexing the result of an attribute lookup, like {{ data.items[1:] }}.

Changes: https://jinja.palletsprojects.com/en/2.11.x/changelog/#version-2-11-1

2.11.0

Changes: https://jinja.palletsprojects.com/en/2.11.x/changelog/#version-2-11-0

Blog: https://palletsprojects.com/blog/jinja-2-11-0-released/

Twitter: https://twitter.com/PalletsTeam/status/1221883554537230336

This is the last version to support Python 2.7 and 3.5. The next version will be Jinja 3.0 and will support Python 3.6 and newer.

2.10.3

Changes: http://jinja.palletsprojects.com/en/2.10.x/changelog/#version-2-10-3

2.10.2

Changes: http://jinja.palletsprojects.com/en/2.10.x/changelog/#version-2-10-2

2.10.1

Changes: https://jinja.palletsprojects.com/en/2.10.x/changelog/#version-2-10-1

Blog: https://palletsprojects.com/blog/jinja-2-10-1-released/

Twitter: https://twitter.com/PalletsTeam/status/1114605127308992513

Changelog

Sourced from jinja2's changelog.

Version 2.11.3

Released 2021-01-31

Improve the speed of the urlize filter by reducing regex backtracking. Email matching requires a word character at the start of the domain part, and only word characters in the TLD. :pr:1343

Version 2.11.2

Released 2020-04-13

Fix a bug that caused callable objects with __getattr__, like :class:~unittest.mock.Mock to be treated as a :func:contextfunction. :issue:1145

Update wordcount filter to trigger :class:Undefined methods by wrapping the input in :func:soft_str. :pr:1160

Fix a hang when displaying tracebacks on Python 32-bit. :issue:1162

Showing an undefined error for an object that raises AttributeError on access doesn't cause a recursion error. :issue:1177

Revert changes to :class:~loaders.PackageLoader from 2.10 which removed the dependency on setuptools and pkg_resources, and added limited support for namespace packages. The changes caused issues when using Pytest. Due to the difficulty in supporting Python 2 and :pep:451 simultaneously, the changes are reverted until 3.0. :pr:1182

Fix line numbers in error messages when newlines are stripped. :pr:1178

The special namespace() assignment object in templates works in async environments. :issue:1180

Fix whitespace being removed before tags in the middle of lines when lstrip_blocks is enabled. :issue:1138

:class:~nativetypes.NativeEnvironment doesn't evaluate intermediate strings during rendering. This prevents early evaluation which could change the value of an expression. :issue:1186

Version 2.11.1

Released 2020-01-30

Fix a bug that prevented looking up a key after an attribute ({{ data.items[1:] }}) in an async template. :issue:1141

... (truncated)

Commits

cf21539 release version 2.11.3
15ef8f0 Merge pull request #1343 from pallets/urlize-speedup
ef658dc speed up urlize matching
eeca0fe Merge pull request #1207 from mhansen/patch-1
2dd7691 Merge pull request #1209 from mhansen/patch-3
4892940 do_dictsort: update example ready to copy/paste
7db7d33 api.rst: bugfix in docs, import PackageLoader
9ec465b fix changelog header
737a4cd release version 2.11.2
179df6b Merge pull request #1190 from pallets/native-eval
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Alex Ioannides

machine learning engineer - (data)scientist - reformed quant - habitual coder - PhD

GitHub Repository

python microservice docker aws ecs travis-ci continuous-integration continuous-deployment boto3