Docker / Build Image From Current Directory
Build Image From Current Directory
Build a Docker image from the current directory using the Dockerfile present.
docker build . docker build . #!/bin/bash
# Build Image From Current Directory
docker build . import subprocess
# Build Image From Current Directory
# Make sure to replace <placeholders> with actual values
def run_command():
cmd = [
"docker",
"build",
"."
]
try:
print(f"Executing: {' '.join(cmd)}")
subprocess.run(cmd, check=True)
except subprocess.CalledProcessError as e:
print(f"Error: {e}")
except FileNotFoundError:
print("Error: docker not found. Please install it first.")
if __name__ == "__main__":
run_command() When To Use
When developing a Docker container image based on local project files.
Pro Tip
Optimize layers in your Dockerfile. Cache layers efficiently to improve build times.
Terminal Output
Expected runtime feedback
Sending build context to Docker daemon 3.072kB\nStep 1/5 : FROM ubuntu:latest\n ---> 47b19964fb50\nStep 2/5 : COPY . /app\n ---> 1f25e5f38a3a\nStep 3/5 : RUN make /app\n ---> Running in 123abc456def\nRemoving intermediate container 123abc456def\n ---> 88e237rdssomething\nStep 4/5 : CMD ["/app/myapp"]\n ---> Running in 789xyz123abc\nRemoving intermediate container 789xyz123abc\n ---> 91askdjfklasjd\nSuccessfully built 91askdjfklasjd\nSuccessfully tagged myapp:latest Anatomy of Output
Understanding the result
Successfully built a1b2c3d4e5f6 Image ID Unique identifier for the newly created Docker image.
Successfully tagged myimage:latest Image Tag Tag name assigned to the built image.
Step 1/5 : FROM ubuntu:20.04 Dockerfile Step Current step in the Dockerfile while building the image.
Power User Variants
Optimized versions
docker build -f Dockerfile.custom . Specify a custom Dockerfile during the build.
docker build --no-cache . Force a complete rebuild without cache.
Troubleshooting
Common pitfalls
Error response from daemon: Dockerfile not found
Solution: Ensure a Dockerfile exists in the current directory.
Error processing tar file: malformed tar file
Solution: Check your context for corruption or issues with included files.
Error: No source files were specified
Solution: Specify context or files required for building the image.
Command Breakdown
What each part is doing
-
docker - Base Command
- The executable that performs this operation. Here it runs Docker before the shell applies any redirect operators.
How To Run
Execution path
- Step 1
Run the command: `docker build .`
- Step 2
Verify the image creation with: `docker images | grep myapp`
- Step 3
Check the output for the image 'myapp'.
Alternative Approaches
Comparable commands in other tools
Alternative containers tools for the same job.
exif -e -o <path/to/thumbnail.jpg> <path/to/image.jpg> Jpegtran / Crop Image Rectangular Region Linux jpegtran -crop <W>x<H> -outfile <path/to/output.jpg> <path/to/image.jpg> Jpegtran / Crop Image Starting At Point Linux jpegtran -crop <W>x<H>+<X>+<Y> <path/to/image.jpg> > <path/to/output.jpg> Virt Sparsify / Convert Image Format Linux virt-sparsify <path/to/image> --convert <qcow2|raw|vdi|...> <path/to/new_image> Scrun / Send Specific Signal To Container scrun kill <container_id> <SIGKILL>