Gitlab CI/CD with kaniko for Codeigniter 3

In order to accomplish this we need to have up and running the following:

• kubernetes cluster, docker swarm or single node docker host
• gitlab installed
• gitlab runners deployed to a host (container or VM)
• a valid Dockerfile
• gitlab ci/cd configuration yml
• kubernetes deployment file

Before starting we need to enable Container Registry. Easiest way to do this is by configuring gitlab to do this for us.

Configuration change should be applied to the file /etc/gitlab/gitlab.rb. Add the following lines to the bottom of file:

registry_external_url 'https://gitlab.0x01.link:5001'
gitlab_rails['registry_enabled'] = true
gitlab_rails['registry_host'] = "gitlab.0x01.link"
gitlab_rails['registry_port'] = "5005"
gitlab_rails['registry_path'] = "/var/opt/gitlab/gitlab-rails/shared/registry"

In order to apply our new configuration change we need to run command gitlab-ctl reconfigure

Right now we are ready to create our Dockerfile required for CI/CD. Paste the following example in a file named Dockerfile in the root of your project:

FROM php:7.4-apache

RUN apt-get update

RUN apt-get install -y \
        libfreetype6-dev \
        libjpeg62-turbo-dev \
        libmcrypt-dev \
        libpng-dev \
        zlib1g-dev \
        libxml2-dev \
        libzip-dev \
        libonig-dev \
        graphviz \
    && docker-php-ext-configure gd \
    && docker-php-ext-install -j$(nproc) gd \
    && docker-php-ext-install pdo_mysql \
    && docker-php-ext-install mysqli \
    && docker-php-ext-install zip \
    && docker-php-source delete

RUN apt-get clean

RUN a2enmod rewrite

RUN curl --silent --show-error https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

# RUN composer global require "phpoffice/phpspreadsheet"

RUN mkdir -p /myproject/

COPY CI/ /myproject/CI/

COPY https/ /myproject/https/

COPY docker/entrypoint.sh /

ENV APACHE_DOCUMENT_ROOT=/var/www/html/https

EXPOSE 80
CMD ["bash", "/entrypoint.sh"]

In order to create our Gitlab build stage is to create our .gitlab-ci.yml. Paste the following example in your yml:

variables:
  CI_REGISTRY: gitlab.0x01.link:5001
  CONTAINER_IMAGE: $CI_REGISTRY/0x01/myproject:v${CI_PIPELINE_ID}
  CONTAINER_IMAGE_LATEST: $CI_REGISTRY/0x01/myproject:latest

stages:
- build
- deploy

build:
  tags:
    - DC1
  stage: build
  image:
    name: gcr.io/kaniko-project/executor:debug
    entrypoint: [""]
  script:
    - mkdir -p /kaniko/.docker
    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_USERNAME\",\"password\":\"$CI_PASSWORD\"}}}" > /kaniko/.docker/config.json
    - /kaniko/executor --context ${CI_PROJECT_DIR}/${KANIKO_CONTEXT:-.} --dockerfile Dockerfile --destination $CONTAINER_IMAGE --destination $CONTAINER_IMAGE_LATEST
  only:
    - master

While we are near by ready in the latest step we need to create a deployment file for kubernetes cluster. You can use the following deployment.yml as an valid example for your implementation:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myproject
  namespace: myproject
  labels:
    app: myproject
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myproject
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 33%
  template:
    metadata:
      labels:
        app: myproject
    spec:
      containers:
        - name: myproject
          image: gitlab.0x01.link:5001/0x01/myproject:latest
          ports:
            - containerPort: 80
      imagePullSecrets:
        - name: registry-secret

In the final step we need to append the following block of code to our .gitlab-ci.yml.

deploy:
  tags:
    - DC1
  stage: deploy
  image:
    name: lwolf/helm-kubectl-docker:latest
  before_script:
    - mkdir -p ~/.kube
    - echo ${kube_config} | base64 -d > ~/.kube/config
    - sed -i -e "s/:latest/:v${CI_PIPELINE_ID}/g" docker/deployment.yaml
    - echo "v${CI_PIPELINE_ID}"
  script:
    - kubectl apply -f deployment.yaml

With this final step we have our build and deploy stages ready.