How to fix OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "app": executable file not found in $PATH in Docker

# Start a shell in the image to explore
docker run -it --entrypoint /bin/sh <image_name>

# Or with bash if available
docker run -it --entrypoint /bin/bash <image_name>

# Then check if the file exists
ls -la /path/to/expected/executable
which <executable_name>

docker create --name temp <image_name>
docker export temp | tar -tvf - | grep <executable_name>
docker rm temp

# Exec form (preferred) - requires full path or PATH lookup
ENTRYPOINT ["/app/myapp"]
CMD ["--flag"]

# Shell form - runs through /bin/sh -c
ENTRYPOINT /app/myapp
CMD --flag

# In Dockerfile
COPY --chmod=755 myapp /app/myapp

# Or add chmod step
COPY myapp /app/myapp
RUN chmod +x /app/myapp

# Add directory to PATH
ENV PATH="/app:$PATH"

# Then you can use just the name
ENTRYPOINT ["myapp"]

# Build stage
FROM golang:1.21 AS builder
WORKDIR /src
COPY . .
RUN go build -o /app/myapp

# Final stage
FROM alpine:latest
# IMPORTANT: Copy the built binary
COPY --from=builder /app/myapp /app/myapp
ENTRYPOINT ["/app/myapp"]

# Run with shell to explore
docker run -it --entrypoint sh <image_name>

# Check what is in the container
ls -la /
cat /etc/os-release
echo $PATH