Dockerfile - Ubuntu with basic Java configurations

Dockerfile

# Use Ubuntu as base image
FROM ubuntu:25.04

# Set non-interactive frontend for apt
ENV DEBIAN_FRONTEND=noninteractive

# Install prerequisites
RUN apt update && apt upgrade -y && apt install -y \
    wget \
    curl \
    git \
    build-essential \
    software-properties-common \
    unzip \
    vim \
    neovim \
    openjdk-21-jdk

# Install Gradle 8.11.1
RUN wget https://services.gradle.org/distributions/gradle-8.11.1-bin.zip -P /tmp && \
    unzip /tmp/gradle-8.11.1-bin.zip -d /opt/ && \
    ln -s /opt/gradle-8.11.1/bin/gradle /usr/bin/gradle


# Verify installations
RUN java -version && \
    gradle -v && \
    git -v && \
    curl --version && \
    wget --version && \
    nvim --version

# Default work directory
WORKDIR /workspace

# Set container's entry point
CMD ["/bin/bash"]

# Base Image
FROM ubuntu:22.04

# Set non-interactive frontend for apt
ENV DEBIAN_FRONTEND=noninteractive

# Update package list and install dependencies
RUN apt-get update && apt-get install -y \
    software-properties-common \
    wget \
    gnupg2 \
    lsb-release \
    && add-apt-repository ppa:openjdk-r/ppa \
    && apt-get update

# Install OpenJDK 21
RUN apt-get install -y openjdk-21-jdk

# Install PostgreSQL
RUN apt-get install -y postgresql postgresql-contrib

# Configure PostgreSQL to listen on all interfaces
RUN sed -i "s/#listen_addresses = 'localhost'/listen_addresses = '*'/g" /etc/postgresql/*/main/postgresql.conf

# Allow all IPs for PostgreSQL connections (adjust for security in production)
RUN echo "host all  all    0.0.0.0/0  trust" >> /etc/postgresql/*/main/pg_hba.conf

# Expose PostgreSQL default port
EXPOSE 5432

# Environment Variables for PostgreSQL
ENV POSTGRES_USER=postgres
ENV POSTGRES_PASSWORD=postgres

# Start PostgreSQL service
CMD service postgresql start && tail -f /dev/null