invoke-kubesae 0.1.0

An invoke tasks library to manage a kubernetes project.

invoke-kubesae

The kubesae library is an invoke tasks library to provide some basic management tasks for working with a kubernetes cluster.

License

This invoke library is released under the BSD License. See the LICENSE file for more details.

Releases

We attempt to not make changes that break backward-compatibility. Nonetheless, you should always use a pinned version of this repo to be safe. Check the release history before upgrading for any notes or warnings.

Contributing

If you think you’ve found a bug or are interested in contributing to this project, check out invoke-kubesae on Github.

Development sponsored by Caktus Consulting Group, LLC.

Installation

pip install into your virtualenv:

$ pip install invoke-kubesae

Usage

Invoke works from a tasks.py file usually found in the project root.

The following code snippet imports all of the the current collections to show an example for supporting AWS, then sets some configuration values for various tasks. Note that GCP is also supported in the providers.gcp module, and works similarly to the providers.aws module. See below for more documentation on the configuration each task uses.

tasks.py:

import invoke
from colorama import init
from kubesae import *


init(autoreset=True)


@invoke.task
def staging(c):
    c.config.env = "staging"
    c.config.namespace = "myproject-staging"
    c.config.container_name = "myproject-web"


ns = invoke.Collection()
ns.add_collection(image)
ns.add_collection(aws)
ns.add_collection(deploy)
ns.add_collection(pod)
ns.add_task(staging)
ns.configure(
    {
        "app": "appname",
        "aws": {
            "region": "us-west-2",
            "profile_name": "my-aws-profile",  # a profile from .aws/credentials
        },
        "repository": "123456789012.dkr.ecr.us-east-1.amazonaws.com/myproject",
        "run": {
            "echo": True,
            "pty": True,
        },
    }
)

Note

The profile_name in the config above is only used when you run custom playbooks, not the main deploy playbook. It is used because boto doesn’t work well with AssumedRoles, so if your playbook needs an AssumedRole we have to convert the role credentials to standard AWS access_key/secret credentials and we use the profile above to do that. This assumes that all devs in your project are using the same profile name, but if you want to customize it, you can create a project-level task to customize it.

Now you can see all of the currently available tasks by running:

$ inv -l

Build an image:

$ inv image.build

Log in to the AWS docker registry:

$ inv aws.docker-login

Push the image just built:

$ inv image.push

Set up your kubectl context:

$ inv aws.configure-eks-kubeconfig

Install Ansible roles:

$ inv deploy.install

Deploy the same tag we just pushed:

$ inv image.tag staging deploy.deploy

Task reference

(In alphabetical order, and by collection)

AWS

configure-eks-kubeconfig

Obtain an EKS access token.

Config:

aws.region: Name of AWS region (default: us-east-1)

cluster: Name of EKS cluster

docker-login

Obtain ECR credentials to use with docker login.

Config:

aws.region: Name of AWS region (default: us-east-1)

repository: Name of docker repository, e.g. dockerhub.com/myproject.

sync-media

Syncs a media bucket between two namespaces (e.g. production to staging, or staging to local).

Deploy

deploy

Deploy your k8s application. (Default)

WARNING: if you are running this in CI, make sure to set –verbosity=0 to prevent environment variables from being logged in plain text in the CI console.

Prereq: deploy.install

Config:

env: The target ansible host (“staging”, “production”, etc …)

tag: Image tag to deploy (default: same as default tag for build & push)

verbosity: integer level of verbosity from 0 to 4 (most verbose)

install

Install ansible-galaxy requirements.yml.

playbook

Run a specified Ansible playbook, located in the deploy/ directory. Used to run a different playbook than the default playbook.

WARNING: if you are running this in CI, make sure to set –verbosity=0 to prevent environment variables from being logged in plain text in the CI console.

Config:

name: The name of the Ansible playbook to run, including the extension

extra: Additional command line arguments to ansible-playbook

verbosity: integer level of verbosity from 0 to 4 (most verbose)

GCP

configure-gcp-kubeconfig

Authenticate into GCP to get credentials for the cluster.

Config:

app: Name of the project in GCP

gcp.region: Name of GCP region (default: us-east1)

cluster: Name of cluster in GCP (default config.cluster)

docker-login

Authenticate into GCP, and configure Docker.

Config:

app: Name of the project in GCP

repository: Name of docker repository, e.g. us.gcr.io/myproject/myproject

sync-media

Syncs a media bucket between two namespaces (e.g. production to staging, or staging to local).

Image

build

Build Docker image. Tags with <tag> parameter and “latest”.

Config:

tag: tag to apply. (Will be generated from git branch/commit if not set).

app_build_target: The dockerfile target for a multistage build. Most often this will be “deploy”

Params:

tag: tag to apply. (Will be generated from git branch/commit if not set).

dockerfile: A non-standard Dockerfile location and/or name

target: Use if the config var has not been set in tasks, or you need to target a non-standard build stage.

push

Push docker image to remote repository. (Default)

This command does the build and tag tasks before pushing.

Config:

repository: Name of docker repository, e.g. dockerhub.com/myproject.

tag: tag to push. (Will be generated from git branch/commit if not set).

Params:

tag: tag to apply. (Will be generated from git branch/commit if not set).

stop

Stops the deployable image in docker-compose

tag

Generate tag based on local branch & commit hash. Set the config “tag” to the resulting tag.

up

Brings up the deployable image locally in docker-compose for testing

Info

print-ansible-vars

A command to inspect any ansible variable by environment. If no variable is specified then it will print out the current k8s environment variables.

Params:

c (invoke.Context): The current invoke context. var (string, optional): The ansible variable you want to expose. Defaults to None. yaml (string, optional): An ansible path. Defaults to None. pty (bool, optional): If piping the output to another command you might need this to be False. Defaults to True. hide (bool, optional): If you don’t want the results to print to the console set to “out”. Defaults to False.

pod-stats

Report total pods vs pod capacity in a cluster.

Pod

clean-collectstatic

Removes all collectstatic pods

Config:

namespace: the k8s namespace that will be cleaned

clean-debian

Clears away the old debian pod so a new one may live.

clean-migrations

Removes all migration jobs

Config:

namespace: the k8s namespace that will be cleaned

debian

An ephemeral container with which to run sysadmin tasks on the cluster

fetch_namespace_var

Takes a variable name that may be present on a running container. Queries the container for the value of that variable and returns it as a Result object.

Config:

namespace: the k8s namespace that will be cleaned

container_name: Name of the Docker container.

Params:

fetch_var (str): An environment variable expected on the target container

hide (bool, optional): Hides the stdout if True. Defaults to False.

get_db_dump

Get a dump of an environment’s database

Config:

namespace: the k8s namespace that will be cleaned

container_name: Name of the Docker container.

Params:

db_var (str): The variable name that the database connection is stored in.

filename (string, optional): A filename to store the dump. If None, will default to {namespace}_database.dump.

restore_db_from_dump

Load a database dump file into an environment’s database

Config:

namespace: the k8s namespace that will be cleaned

container_name: Name of the Docker container.

Params:

db_var (str): The variable the database connection is stored in.

filename (string): An filename of the dump to restore.

shell

Gives you a shell on the application pod. (Default)

Config:

container_name: Name of the Docker container.

Utils

get_backup_from_hosting

Downloads a backup from the caktus hosting services bucket

Params:

c (invoke.Context): the running context latest (str, optional): Gets the latest backup from the specified temporal period. Defaults to “daily”. Options are “daily”, “weekly”, “monthly”, “yearly” profile (str, optional): The AWS profile to allow access to the s3 bucket. DEFAULT: “caktus” backup_name(str, optional): A specific backup filename. list(bool, optional): If set, will list the contents of the bucket for the projects folder and exit.

The use of this task requires the addition of hosting_services_backup_folder to your tasks.py configuration:

ns.configure({“hosting_services_backup_folder”: “<PROJECT_FOLDER>”,})

count_backups

Sorts the backups generated with caktus-hosting-services cronjob and prints the number found of each type.

Params:

c (invoke.Context): The running context bucket_identifier (str, optional): The name of the bucket that holds the backups. DEFAULT: caktus-hosting-services-backups profile (str, optional): The AWS profile with list access to the bucket. DEFAULT: caktus extra_schedules (str, optional): A comma delimited string with each additional schedule name no spaces. EXAMPLE: ‘every2hours,every-hour,every-thursday’

list_backup_schedules

Lists the backup schedules found in a project’s hosting bucket.

Params:

c (invoke.Context): The running context bucket_identifier (str, optional): The name of the bucket that holds the backups. DEFAULT: caktus-hosting-services-backups profile (str, optional): The AWS profile with list access to the bucket. DEFAULT: caktus