Docker Custom Environment Dengan Sed & Envsubst ::

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Awalan

Bagi yang sering menggunakan docker-compose, sudah familiar dengan opsi environment, kita coba lihat dari Shlink

name: service-contoh
services:
    service-contoh:
        .
        .
        .
        #kita akan belajar custom bagian ini
        environment:
            - DB_DRIVER=${DB_DRIVER}
            - DB_USER=${DB_USER}
            - DB_PASSWORD=${DB_PASSWORD}
            - DB_HOST=${DB_HOST}
            - DB_NAME=${DB_NAME}
        #dengan yg lebih simpel tentunya
          .
          .
          .

Menggunakan `sed`

Siapkan beberapa file .env, docker-compose.yml, Dockerfile, entrypoint.sh, index.html & nginx.conf
File index.html

<html>
    <head>
        <title>Test</title>
    </head>
    <body>
        Selamat datang di {URL}
    </body>
</html>

nginx.conf

worker_processes 1;
error_log stderr warn;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include mime.types;
    default_type application/octet-stream;

    # Define custom log format to include reponse times
   # log_format main_timed '$remote_addr - $remote_user [$time_local] "$request" '
 #                         '$status $body_bytes_sent "$http_referer" '
  #                        '"$http_user_agent" "$http_x_forwarded_for" '
   #                       '$request_time $upstream_response_time $pipe $upstream_cache_status';

    access_log off;
    error_log off;

    # allow the server to close connection on non responding client, this will free up memory
    reset_timedout_connection on;

    # request timed out -- default 60
    client_body_timeout 10;

    # if client stop responding, free up memory -- default 60
    send_timeout 2;

    # server will close connection after this time -- default 75
    keepalive_timeout 30;

    # number of requests client can make over keep-alive -- for testing environment
    keepalive_requests 100000;

    # Write temporary files to /tmp so they can be created as a non-privileged user
    client_body_temp_path /tmp/client_temp;
    proxy_temp_path /tmp/proxy_temp_path;
    fastcgi_temp_path /tmp/fastcgi_temp;
    uwsgi_temp_path /tmp/uwsgi_temp;
    scgi_temp_path /tmp/scgi_temp;

    # Default server definition
    server {
        #please use uncommon port
        listen [::]:80 default_server;
        listen 80 default_server;
        server_name _;
        server_tokens off;
        sendfile off;
        root /var/www/html;

        location / {
            index index.html;
        }


    }

    gzip on;
    gzip_proxied any;
    gzip_types text/plain application/xml text/css text/js text/xml application/x-javascript text/javascript application/json application/xml+rss font/truetype font/opentype;
    gzip_vary on;
    gzip_disable "msie6";

    # Include other server configs
    include /etc/nginx/conf.d/*.conf;
}

entrypoint.sh

#!/bin/bash

find /var/www/html -type f -name "*.html" -exec sed -i -e "s|{URL}|URL|g" {} \;

nginx -g "daemon off;"

Dockerfile

FROM nginx:alpine

# Install tzdata and remove default.conf
RUN apk --no-cache add tzdata && \
    rm /etc/nginx/conf.d/default.conf

WORKDIR /var/www/html

# Set timezone to Asia/Jakarta
RUN cp /usr/share/zoneinfo/Asia/Jakarta /etc/localtime && \
    echo "Asia/Jakarta" > /etc/timezone

# Copy custom nginx.conf
COPY nginx.conf /etc/nginx/nginx.conf

# Create document root directory
RUN mkdir -p /var/www/html

# Copy application files
COPY . /var/www/html/

# Set ownership of document root
RUN chown -R nginx:nginx /var/www/html

EXPOSE 8080

COPY entrypoint.sh /var/www/html/entrypoint.sh
RUN chmod +x /var/www/html/entrypoint.sh

ENTRYPOINT [ "sh", "/var/www/html/entrypoint.sh" ]
CMD []

docker-compose.yml

name: env-custom-test

services:
  env-custom-test:
    image: docker.io/library/env-custom-test-image:latest
    container_name: env-custom-test-ctr
    restart: always
    ports:
      - 88:80
    env_file:
      - .env
    environment:
      - URL=${URL}
    networks:
      - env-custom-test-net

networks:
  env-custom-test-net:

File .env

URL=ipang.my.id

Build image dengan docker build -t env-custom-test-image:latest .
Jalankan docker compose up -d
Coba ganti value di .env untuk bereksperimen

Menggunakan `envsubst`

Siapkan beberapa file .env, docker-compose.yml, Dockerfile, entrypoint.sh, index.html & nginx.conf
File index.html

<html>
    <head>
        <title>Test</title>
    </head>
    <body>
        Selamat datang di $URL
    </body>
</html>

nginx.conf

worker_processes 1;
error_log stderr warn;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include mime.types;
    default_type application/octet-stream;

    # Define custom log format to include reponse times
   # log_format main_timed '$remote_addr - $remote_user [$time_local] "$request" '
 #                         '$status $body_bytes_sent "$http_referer" '
  #                        '"$http_user_agent" "$http_x_forwarded_for" '
   #                       '$request_time $upstream_response_time $pipe $upstream_cache_status';

    access_log off;
    error_log off;

    # allow the server to close connection on non responding client, this will free up memory
    reset_timedout_connection on;

    # request timed out -- default 60
    client_body_timeout 10;

    # if client stop responding, free up memory -- default 60
    send_timeout 2;

    # server will close connection after this time -- default 75
    keepalive_timeout 30;

    # number of requests client can make over keep-alive -- for testing environment
    keepalive_requests 100000;

    # Write temporary files to /tmp so they can be created as a non-privileged user
    client_body_temp_path /tmp/client_temp;
    proxy_temp_path /tmp/proxy_temp_path;
    fastcgi_temp_path /tmp/fastcgi_temp;
    uwsgi_temp_path /tmp/uwsgi_temp;
    scgi_temp_path /tmp/scgi_temp;

    # Default server definition
    server {
        #please use uncommon port
        listen [::]:80 default_server;
        listen 80 default_server;
        server_name _;
        server_tokens off;
        sendfile off;
        root /var/www/html;

        location / {
            index index.html;
        }


    }

    gzip on;
    gzip_proxied any;
    gzip_types text/plain application/xml text/css text/js text/xml application/x-javascript text/javascript application/json application/xml+rss font/truetype font/opentype;
    gzip_vary on;
    gzip_disable "msie6";

    # Include other server configs
    include /etc/nginx/conf.d/*.conf;
}

entrypoint.sh

#!/bin/bash

#envsubst cannot override original file
envsubst < "index.html" > "index.html.temp"

mv index.html.temp index.html

nginx -g "daemon off;

Dockerfile

FROM nginx:alpine

# Install tzdata and remove default.conf
RUN apk --no-cache add tzdata && \
    rm /etc/nginx/conf.d/default.conf

WORKDIR /var/www/html

# Set timezone to Asia/Jakarta
RUN cp /usr/share/zoneinfo/Asia/Jakarta /etc/localtime && \
    echo "Asia/Jakarta" > /etc/timezone

# Copy custom nginx.conf
COPY nginx.conf /etc/nginx/nginx.conf

# Create document root directory
RUN mkdir -p /var/www/html

# Copy application files
COPY . /var/www/html/

# Set ownership of document root
RUN chown -R nginx:nginx /var/www/html

EXPOSE 8080

COPY entrypoint.sh /var/www/html/entrypoint.sh
RUN chmod +x /var/www/html/entrypoint.sh

ENTRYPOINT [ "sh", "/var/www/html/entrypoint.sh" ]
CMD []

docker-compose.yml

name: envsubst-custom-test

services:
  envsubst-custom-test:
    image: docker.io/library/envsubst-custom-test-image:latest
    container_name: envsubst-custom-test-ctr
    restart: always
    ports:
      - 888:80
    env_file:
      - .env
    environment:
      - URL=${URL}
    networks:
      - envsubst-custom-test-net

networks:
  envsubst-custom-test-net:

File .env

URL=ipang.my.id

Build image dengan docker build -t envsubst-custom-test-image:latest . --no-cache
Jalankan docker compose up -d
Coba ganti value di .env untuk bereksperimen

Docker Custom Environment Dengan Sed & Envsubst

Docker custom environment dengan sed & envsubst

Awalan

Menggunakan sed

Menggunakan envsubst

Docker custom environment dengan `sed` & `envsubst`

Menggunakan `sed`

Menggunakan `envsubst`