Install and run on other CI/CD, Host, Linux and Buildah

Requirements

• CI system;

• Linux host to run CI jobs, with:

  • Shell Runner of your CI system of choice;

  • Bash;

  • Git version 2.18.0 or above;

  • GPG.

Installing Buildah

To install Buildah, do the following on the host for running CI jobs:

• Install the Buildah package following the official instructions but refrain from configuring it. If there are no pre-made Buildah packages for your distribution, refer to the following guidelines:

• (For Linux 5.12 and below) Install the package that provides the fuse-overlayfs utility.

• Make sure the /home/<user to run CI jobs>/.local/share/containers path is created and the user to run CI jobs has read and write access.

• The sysctl -ne kernel.unprivileged_userns_clone command should NOT return 0, otherwise run echo 'kernel.unprivileged_userns_clone = 1' | sudo tee -a /etc/sysctl.conf && sudo sysctl -p.

• The sysctl -n user.max_user_namespaces command should return 15000 or more, otherwise run echo 'user.max_user_namespaces = 15000' | sudo tee -a /etc/sysctl.conf && sudo sysctl -p.

Installing werf

On the host for running CI jobs, run the following command to install werf:

curl -sSL https://werf.io/install.sh | bash -s -- --ci

Configuring the container registry

Enable garbage collection for your container registry.

Preparing the system for cross-platform building (optional)

This step only needed to build images for platforms other than host platform running werf.

Register emulators on your system using qemu-user-static:

docker run --restart=always --name=qemu-user-static -d --privileged --entrypoint=/bin/sh multiarch/qemu-user-static -c "/register --reset -p yes && tail -f /dev/null"

Configuring CI/CD of the project

This is how the repository that uses werf for build and deploy might look:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
        - name: app
          image: {{ .Values.werf.image.app }}

apiVersion: v1
kind: Service
metadata:
  name: app
spec:
  selector:
    app: app
  ports:
    - name: app
      port: 80

FROM node

WORKDIR /app
COPY . .
RUN npm ci

CMD ["node", "server.js"]

{
  "name": "app",
  "version": "1.0.0",
  "lockfileVersion": 2,
  "requires": true,
  "packages": {
    "": {
      "name": "app",
      "version": "1.0.0"
    }
  }
}

{
  "name": "app",
  "version": "1.0.0",
  "main": "server.js",
  "scripts": {
    "start": "node server.js"
  }
}

const http = require('http');

const hostname = '127.0.0.1';
const port = 80;

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World');
});

server.listen(port, hostname, () => {
  console.log(`Server running at http://${hostname}:${port}/`);
});

environment_variables:
  WERF_BUILDAH_MODE: auto
  WERF_REPO: registry.example.org/myrepo
  WERF_ENV: "${CI_ENVIRONMENT}"
  WERF_ENABLE_PROCESS_EXTERMINATOR: "1"

before_every_job:
  - source "$(~/bin/trdl use werf 2 stable)"
  - werf cr login -u "${REGISTRY_USER:?}" -p "${REGISTRY_PASSWORD:?}" "${WERF_REPO:?}"

jobs:
  prod:
    commands:
      - werf converge
    environment: prod
    on: master
    how: manually

  images:cleanup:
    commands:
      - werf cleanup
    on: master
    how: daily

configVersion: 1
project: myproject
---
image: app
dockerfile: Dockerfile
context: ./app

Extras:

• Add authorization options for werf cleanup in the container registry by following instructions.