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| 1 | +Docker Best Practices for Java 25 Applications |
| 2 | + |
| 3 | + Comprehensive guidelines for containerizing Java 25 applications using Docker, focusing on performance optimization, security enhancements, and efficient resource utilization. |
| 4 | + |
| 5 | + |
| 6 | + |
| 7 | + |
| 8 | + Use Appropriate Base Images |
| 9 | + |
| 10 | + Select the most suitable base image for your Java 25 application, considering size, security, and compatibility requirements. |
| 11 | + |
| 12 | + |
| 13 | + Use `eclipse-temurin:25-jre-alpine` for minimal production images |
| 14 | + Use `eclipse-temurin:25-jdk-alpine` only when JDK tools are required at runtime |
| 15 | + Prefer Alpine Linux variants for smaller image sizes |
| 16 | + Use specific version tags instead of `latest` for reproducible builds |
| 17 | + |
| 18 | + |
| 19 | +### Example : |
| 20 | + |
| 21 | +Title: |
| 22 | +Description: |
| 23 | + |
| 24 | + |
| 25 | + |
| 26 | + |
| 27 | + Implement Multi-Stage Builds |
| 28 | + |
| 29 | + Separate the build environment from the runtime environment to create lean, secure final images by excluding unnecessary build tools and dependencies. |
| 30 | + |
| 31 | + |
| 32 | + Use a build stage with JDK for compilation |
| 33 | + Use a runtime stage with JRE for execution |
| 34 | + Copy only necessary artifacts between stages |
| 35 | + Minimize the number of layers in the final image |
| 36 | + |
| 37 | + |
| 38 | +### Example : |
| 39 | + |
| 40 | +Title: |
| 41 | +Description: |
| 42 | + |
| 43 | + |
| 44 | + |
| 45 | + |
| 46 | + Optimize JVM Configuration for Containers |
| 47 | + |
| 48 | + Configure the JVM to work efficiently within container resource constraints, taking advantage of Java 25's container awareness features. |
| 49 | + |
| 50 | + |
| 51 | + Use `-XX:+UseContainerSupport` to enable container awareness (enabled by default in Java 25) |
| 52 | + Set appropriate heap size using `-Xms` and `-Xmx` based on container memory limits |
| 53 | + Use `-XX:+UseG1GC` for better performance in containerized environments |
| 54 | + Enable JVM ergonomics with `-XX:+UnlockExperimentalVMOptions` for Java 25 features |
| 55 | + Use `-XX:+ExitOnOutOfMemoryError` to ensure container restart on OOM |
| 56 | + |
| 57 | + |
| 58 | +### Example : |
| 59 | + |
| 60 | +Title: |
| 61 | +Description: |
| 62 | + |
| 63 | + |
| 64 | + |
| 65 | + |
| 66 | + Implement Security Best Practices |
| 67 | + |
| 68 | + Enhance container security by following the principle of least privilege and implementing defense-in-depth strategies. |
| 69 | + |
| 70 | + |
| 71 | + Create and use a non-root user for running the application |
| 72 | + Use read-only root filesystem when possible |
| 73 | + Minimize the attack surface by removing unnecessary packages |
| 74 | + Scan images for vulnerabilities regularly |
| 75 | + Use secrets management for sensitive data |
| 76 | + |
| 77 | + |
| 78 | +### Example : |
| 79 | + |
| 80 | +Title: |
| 81 | +Description: |
| 82 | + |
| 83 | + |
| 84 | + |
| 85 | + |
| 86 | + Optimize Image Layers and Caching |
| 87 | + |
| 88 | + Structure Dockerfile commands to maximize Docker layer caching and minimize image size. |
| 89 | + |
| 90 | + |
| 91 | + Order commands from least to most frequently changing |
| 92 | + Copy dependency files before source code to leverage cache |
| 93 | + Combine related RUN commands to reduce layers |
| 94 | + Use `.dockerignore` to exclude unnecessary files |
| 95 | + Clean up package caches and temporary files in the same layer |
| 96 | + |
| 97 | + |
| 98 | +### Example : |
| 99 | + |
| 100 | +Title: |
| 101 | +Description: |
| 102 | + |
| 103 | + |
| 104 | + |
| 105 | + |
| 106 | + Configure Health Checks and Monitoring |
| 107 | + |
| 108 | + Implement comprehensive health checking and monitoring to ensure application reliability and observability. |
| 109 | + |
| 110 | + |
| 111 | + Define Docker health checks for container orchestration |
| 112 | + Implement application health endpoints |
| 113 | + Configure proper logging to stdout/stderr |
| 114 | + Use structured logging formats (JSON) for better parsing |
| 115 | + Include JVM metrics and garbage collection monitoring |
| 116 | + |
| 117 | + |
| 118 | +### Example : |
| 119 | + |
| 120 | +Title: |
| 121 | +Description: |
| 122 | + |
| 123 | + |
| 124 | + |
| 125 | + |
| 126 | + Manage Configuration and Secrets |
| 127 | + |
| 128 | + Externalize configuration and handle secrets securely to support different deployment environments. |
| 129 | + |
| 130 | + |
| 131 | + Use environment variables for configuration |
| 132 | + Support configuration files mounted as volumes |
| 133 | + Never embed secrets in Docker images |
| 134 | + Use Docker secrets or external secret management |
| 135 | + Implement configuration validation at startup |
| 136 | + |
| 137 | + |
| 138 | +### Example : |
| 139 | + |
| 140 | +Title: |
| 141 | +Description: |
| 142 | + |
| 143 | + |
| 144 | + |
| 145 | + |
| 146 | + Optimize for Different Deployment Scenarios |
| 147 | + |
| 148 | + Create flexible Docker configurations that work well across development, testing, and production environments. |
| 149 | + |
| 150 | + |
| 151 | + Use build arguments for environment-specific customization |
| 152 | + Support both standalone and orchestrated deployments |
| 153 | + Implement graceful shutdown handling |
| 154 | + Configure appropriate resource limits and requests |
| 155 | + Use init systems for proper signal handling in containers |
| 156 | + |
| 157 | + |
| 158 | +### Example : |
| 159 | + |
| 160 | +Title: |
| 161 | +Description: |
| 162 | + |
| 163 | + |
| 164 | + |
| 165 | + |
| 166 | + Leverage Java 25 Specific Features |
| 167 | + |
| 168 | + Take advantage of Java 25's latest features and improvements for better container performance and developer experience. |
| 169 | + |
| 170 | + |
| 171 | + Use Virtual Threads for improved scalability in I/O-intensive applications |
| 172 | + Leverage Pattern Matching and Switch Expressions for cleaner code |
| 173 | + Use Record Classes for data transfer objects |
| 174 | + Take advantage of improved garbage collection algorithms |
| 175 | + Use Text Blocks for embedded configuration or SQL |
| 176 | + |
| 177 | + |
| 178 | +### Example : |
| 179 | + |
| 180 | +Title: |
| 181 | +Description: |
| 182 | + |
| 183 | + |
| 184 | + |
| 185 | + |
| 186 | + Implement Efficient Development Workflow |
| 187 | + |
| 188 | + Create Docker configurations that support efficient development cycles and debugging capabilities. |
| 189 | + |
| 190 | + |
| 191 | + Use Docker Compose for local development environments |
| 192 | + Implement hot-reload capabilities for development |
| 193 | + Support remote debugging configurations |
| 194 | + Create separate profiles for development and production |
| 195 | + Use volume mounts for rapid iteration during development |
| 196 | + |
| 197 | + |
| 198 | +### Example : |
| 199 | + |
| 200 | +Title: |
| 201 | +Description: |
| 202 | + |
| 203 | + |
| 204 | + |
| 205 | + |
| 206 | + |
| 207 | + |
| 208 | + Using Root User in Production |
| 209 | + Running applications as root user increases security risks |
| 210 | + |
| 211 | +### Example : |
| 212 | + |
| 213 | +Title: |
| 214 | +Description: |
| 215 | + |
| 216 | + |
| 217 | + |
| 218 | + |
| 219 | + Installing Unnecessary Packages |
| 220 | + Including development tools and unnecessary packages in production images |
| 221 | + |
| 222 | +### Example : |
| 223 | + |
| 224 | +Title: |
| 225 | +Description: |
| 226 | + |
| 227 | + |
| 228 | + |
| 229 | + |
| 230 | + Hardcoding Configuration |
| 231 | + Embedding environment-specific configuration in Docker images |
| 232 | + |
| 233 | +### Example : |
| 234 | + |
| 235 | +Title: |
| 236 | +Description: |
| 237 | + |
| 238 | + |
| 239 | + |
| 240 | + |
| 241 | + Ignoring JVM Container Settings |
| 242 | + Not configuring JVM for container resource limits |
| 243 | + |
| 244 | +### Example : |
| 245 | + |
| 246 | +Title: |
| 247 | +Description: |
| 248 | + |
| 249 | + |
| 250 | + |
| 251 | + |
| 252 | + Using Latest Tags in Production |
| 253 | + Using unstable or latest tags for base images in production |
| 254 | + |
| 255 | +### Example : |
| 256 | + |
| 257 | +Title: |
| 258 | +Description: |
| 259 | + |
| 260 | + |
| 261 | + |
| 262 | + |
| 263 | + |
| 264 | + Use multi-stage builds with appropriate base images |
| 265 | + Configure JVM for container environments |
| 266 | + Implement security best practices with non-root users |
| 267 | + Optimize Docker layers and caching strategies |
| 268 | + Configure comprehensive health checks and monitoring |
| 269 | + Externalize configuration and manage secrets properly |
| 270 | + Leverage Java 25 specific features and improvements |
| 271 | + Support efficient development workflows |
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