Domain: System and Network

System and Network

Monitoring processes and resources, managing services, testing connectivity, inspecting sockets, making HTTP requests, configuring firewalls, and connecting to GCP infrastructure.

mindmap
  ((System and Network))
    (viewing processes)
    (system resources)
    (killing processes)
    (managing services)
    (connectivity testing)
    (socket inspection)
    (HTTP, APIs)
    (firewalls)
    (IAP tunneling)
    (GCP resources)

01-viewing-processes

• Listing and monitoring processes
• Diagnosing a slow VM
• The D state (unkillable processes)
• PowerShell equivalents

04-system-resources

• Memory usage
• CPU and load average
• Combined system snapshot
• SQL Server memory interpretation
• PowerShell equivalents

02-killing-processes

• Kill by pattern
• Kill a process group
• Correct kill escalation
• PowerShell equivalents

03-managing-services

• Service lifecycle and logs
• Enable on boot
• Diagnosing OOM kills
• PowerShell equivalents

01-connectivity-testing

• Port reachability testing
• DNS lookup
• Path tracing
• Debugging failed connections
• PowerShell equivalents

03-socket-inspection

• Listening address scope
• Common ports reference
• Connection counting and filtering
• Refused vs timed out
• PowerShell equivalents

02-http-requests-and-apis

• Sending requests
• Retry and timeout
• Latency diagnosis
• Tool selection
• PowerShell equivalents

04-firewalls

• Linux firewall rules
• Default deny baseline
• Defense in depth strategy
• PowerShell equivalents

05-iap-tunneling

• How IAP works
• Tunnel commands
• Debugging tunnels
• IAP vs VPN vs bastion

06-connecting-to-gcp-resources

• Compute Engine SSH
• SQL Server via IAP
• BigQuery direct API
• Cloud Run
• Connection matrix