Linux Troubleshooting

# Linux Troubleshooting Workflow

Overview

Specialized workflow for diagnosing and resolving Linux system issues including performance problems, service failures, network issues, and resource constraints.

When to Use This Workflow

Use this workflow when:

- Diagnosing system performance issues

- Troubleshooting service failures

- Investigating network problems

- Resolving disk space issues

- Debugging application errors

Workflow Phases

Phase 1: Initial Assessment

#### Skills to Invoke

- `bash-linux` - Linux commands

- `devops-troubleshooter` - Troubleshooting

#### Actions

1. Check system uptime

2. Review recent changes

3. Identify symptoms

4. Gather error messages

5. Document findings

#### Commands

uptime
hostnamectl
cat /etc/os-release
dmesg | tail -50

#### Copy-Paste Prompts

Use @bash-linux to gather system information

Phase 2: Resource Analysis

#### Skills to Invoke

- `bash-linux` - Resource commands

- `performance-engineer` - Performance analysis

#### Actions

1. Check CPU usage

2. Analyze memory

3. Review disk space

4. Monitor I/O

5. Check network

#### Commands

top -bn1 | head -20
free -h
df -h
iostat -x 1 5

#### Copy-Paste Prompts

Use @performance-engineer to analyze system resources

Phase 3: Process Investigation

#### Skills to Invoke

- `bash-linux` - Process commands

- `server-management` - Process management

#### Actions

1. List running processes

2. Identify resource hogs

3. Check process status

4. Review process trees

5. Analyze strace output

#### Commands

ps aux --sort=-%cpu | head -10
pstree -p
lsof -p PID
strace -p PID

#### Copy-Paste Prompts

Use @server-management to investigate processes

Phase 4: Log Analysis

#### Skills to Invoke

- `bash-linux` - Log commands

- `error-detective` - Error detection

#### Actions

1. Check system logs

2. Review application logs

3. Search for errors

4. Analyze log patterns

5. Correlate events

#### Commands

journalctl -xe
tail -f /var/log/syslog
grep -i error /var/log/*

#### Copy-Paste Prompts

Use @error-detective to analyze log files

Phase 5: Network Diagnostics

#### Skills to Invoke

- `bash-linux` - Network commands

- `network-engineer` - Network troubleshooting

#### Actions

1. Check network interfaces

2. Test connectivity

3. Analyze connections

4. Review firewall rules

5. Check DNS resolution

#### Commands

ip addr show
ss -tulpn
curl -v http://target
dig domain

#### Copy-Paste Prompts

Use @network-engineer to diagnose network issues

Phase 6: Service Troubleshooting

#### Skills to Invoke

- `server-management` - Service management

- `systematic-debugging` - Debugging

#### Actions

1. Check service status

2. Review service logs

3. Test service restart

4. Verify dependencies

5. Check configuration

#### Commands

systemctl status service
journalctl -u service -f
systemctl restart service

#### Copy-Paste Prompts

Use @systematic-debugging to troubleshoot service issues

Phase 7: Resolution

#### Skills to Invoke

- `incident-responder` - Incident response

- `bash-pro` - Fix implementation

#### Actions

1. Implement fix

2. Verify resolution

3. Monitor stability

4. Document solution

5. Create prevention plan

#### Copy-Paste Prompts

Use @incident-responder to implement resolution

Troubleshooting Checklist

- [ ] System information gathered

- [ ] Resources analyzed

- [ ] Logs reviewed

- [ ] Network tested

- [ ] Services verified

- [ ] Issue resolved

- [ ] Documentation created

Quality Gates

- [ ] Root cause identified

- [ ] Fix verified

- [ ] Monitoring in place

- [ ] Documentation complete

Related Workflow Bundles

- `os-scripting` - OS scripting

- `bash-scripting` - Bash scripting

- `cloud-devops` - DevOps