# Execution flow of `docker run`:

Q: # Execution flow of `docker run`:

1. **Docker CLI** converts the command to a REST API call and sends it to `dockerd`. 2. `dockerd` calls `containerd` via gRPC. 3. `containerd` downloads the image (if missing) and creates the runtime bundle metadata. 4. `containerd` calls `containerd-shim` (which keeps the container alive without keeping containerd active). 5. `containerd-shim` calls `runc` to create namespaces, attach cgroups, and start the container process. 6. Once the process is running, `runc` exits.

💬Answer

Docker CLI converts the command to a REST API call and sends it to dockerd.
dockerd calls containerd via gRPC.
containerd downloads the image (if missing) and creates the runtime bundle metadata.
containerd calls containerd-shim (which keeps the container alive without keeping containerd active).
containerd-shim calls runc to create namespaces, attach cgroups, and start the container process.
Once the process is running, runc exits.

Apurv Gujjar

DevOps & Cloud Engineer

Specialized in:DevOpsAWSGCPKubernetesTerraformDocker

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# Execution flow of `docker run`:

💬Answer

Docker CLI converts the command to a REST API call and sends it to dockerd.
dockerd calls containerd via gRPC.
containerd downloads the image (if missing) and creates the runtime bundle metadata.
containerd calls containerd-shim (which keeps the container alive without keeping containerd active).
containerd-shim calls runc to create namespaces, attach cgroups, and start the container process.
Once the process is running, runc exits.

Apurv Gujjar

DevOps & Cloud Engineer

Specialized in:DevOpsAWSGCPKubernetesTerraformDocker

View Portfolio

# Execution flow of `docker run`:

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Apurv Gujjar

# Execution flow of `docker run`:

Related Docker Questions

How would you explain the difference between a container and a virtual machine to someone new to DevOps?

What is Docker, and what specific advantages does it bring to the software development lifecycle?

Can you walk me through the low-level container runtime stack (runc, containerd, CRI-O)? What actually happens under the hood when 'docker run' executes?

How does Docker use Linux namespaces to isolate container processes?

Apurv Gujjar