ARC Command in ChromeOS: Managing Android Runtime

The arc command in ChromeOS provides powerful tools for managing and monitoring the Android Runtime environment. This chapter explores how to use these tools effectively through the Chrome OS Shell (crosh).

Understanding Network Types

When using network-related commands, you can specify different network types: - wifi: Wireless network connection - eth/ethernet: Wired network connection - cell/cellular: Mobile network connection - vpn: Virtual Private Network connection

If no network type is specified, the default network will be used.

Network Diagnostics

Ping Command

Test network connectivity to a specific host:

bash arc ping [NETWORK] [<ip address> | <hostname>]

Examples: ```bash

Ping Google's DNS over WiFi

arc ping wifi 8.8.8.8

Ping a domain name using default network

arc ping example.com ```

HTTP Testing

Perform GET requests to test web connectivity:

bash arc http [NETWORK] <url>

This command performs a GET request and displays the response headers, useful for debugging web connectivity issues.

Example: bash arc http wifi https://www.google.com

DNS Resolution

Test domain name resolution:

bash arc dns [NETWORK] <domain>

Example: bash arc dns wifi google.com

Proxy Configuration

Check proxy settings for specific URLs:

bash arc proxy <url>

This command shows how a given URL would be accessed through your current proxy configuration.

System Monitoring

Network Information

View connected network properties:

bash arc list networks

This command displays detailed information about all Android-connected networks.

Statistical Analysis

Socket Statistics

Monitor TCP connections and DNS activity:

bash arc stats sockets

This shows TCP connect and DNS statistics organized by Android apps.

Traffic Analysis

View packet statistics by application:

bash arc stats traffic

This command provides detailed traffic information for Android apps.

System Idle Statistics

Monitor system idle states:

bash arc stats idle

This shows how the Android system manages idle states.

Resource Monitoring

Process Overview

View system resource usage:

bash arc top

This provides a snapshot of resource usage, similar to the Linux top command.

CPU Usage

Monitor CPU utilization:

bash arc cpuinfo

This shows detailed CPU usage statistics for the Android environment.

Memory Usage

Check memory allocation:

bash arc meminfo

This displays comprehensive memory usage information for the Android subsystem.

Debug and Development

Tracing Configuration

Enable or disable ARCVM tracing from the host:

bash arc tracing [on | off]

This is particularly useful for debugging and development purposes.

Best Practices

Network Diagnostics
Start with ping tests to verify basic connectivity
Use HTTP tests to verify web access
Check DNS resolution if hostname access fails
Performance Monitoring
Regularly check resource usage with top and meminfo
Monitor app-specific traffic patterns
Track system idle statistics for battery optimization
Troubleshooting
Use network-specific commands to isolate connection issues
Monitor socket statistics when debugging app connectivity
Enable tracing for detailed debugging information

Common Use Cases

Debugging Network Issues

```bash

Check basic connectivity

arc ping wifi google.com

Verify DNS resolution

arc dns wifi problematic-domain.com

Test web access

arc http wifi https://problematic-site.com ```

Performance Investigation

```bash

Check system resources

arc top

Monitor memory usage

arc meminfo

View network statistics

arc stats traffic ```