At 11:00 PM, the phone rings.
A client says:
“The website is down.”
This is where a junior administrator starts guessing.
A strong system administrator starts asking questions.
Is the server reachable?
Is the web server running?
Is PHP-FPM healthy?
Is the database responding?
Is the disk full?
Did someone deploy something 10 minutes ago?
Are there errors in the logs?
The difference between a beginner and an experienced SysAdmin isn't how many commands they memorized.
It's how systematically they think when something breaks.
The SysAdmin Mental Model
Almost every production incident can be approached with the same pattern:
Verify → Isolate → Inspect → Fix → Verify → Prevent
Don't restart everything.
Don't randomly change configuration.
Don't immediately blame the application.
Find the failure.
Then fix the failure.
Scenario #1: The Website Is Down
Imagine a production website stops responding at 11 PM.
Your first step isn't:
sudo systemctl restart nginx
Your first step is verification.
Try:
curl -I https://example.com
Check connectivity:
ping SERVER_IP
Then connect to the server:
ssh user@SERVER_IP
Check the basic health:
uptime
free -h
df -h
top
Now inspect the web server:
systemctl status nginx
If you're using Apache:
systemctl status apache2
Then check logs.
For Nginx:
tail -50 /var/log/nginx/error.log
For PHP-FPM:
tail -50 /var/log/php8.2-fpm.log
If the site returns 502 Bad Gateway, investigate the upstream service.
For example:
systemctl status php8.2-fpm
Then check the database:
systemctl status mysql
And finally:
df -h
Because a surprisingly large number of “application problems” are actually disk-full problems.
The interview answer
Don't simply say:
“I would restart Nginx.”
Say:
“First I would verify the outage and determine whether it's isolated to one website or affects the entire server. Then I'd check server resources, web-server status, application services, database connectivity and logs. I would identify the root cause before making changes, verify the fix, and document the incident.”
That sounds like an administrator.
Scenario #2: The Server Is Slow
“It's slow” is not a diagnosis.
It's a symptom.
Start with:
uptime
free -h
htop
Check CPU:
ps aux --sort=-%cpu | head
Check memory:
ps aux --sort=-%mem | head
Check disk I/O:
iostat
Then investigate the web server.
How much traffic are you receiving?
Which IPs are generating the most requests?
For example:
awk '{print $1}' /var/log/nginx/access.log | sort | uniq -c | sort -rn | head
Then investigate the database.
SHOW PROCESSLIST;
A slow website might actually be:
Nginx → PHP-FPM → MySQL → slow query
Restarting Nginx won't fix that.
This is why troubleshooting must follow the request path.
Scenario #3: SSL Certificate Expired
Users see:
“Your connection is not private.”
Check the certificate:
echo | openssl s_client \
-connect example.com:443 2>/dev/null \
| openssl x509 -noout -dates
For Let's Encrypt:
sudo certbot renew --dry-run
If renewal is required:
sudo certbot renew
Then validate Nginx before reloading:
sudo nginx -t
sudo systemctl reload nginx
The important interview point isn't knowing Certbot.
It's knowing the sequence:
Identify → Renew → Validate → Reload → Verify → Automate
And always test automatic renewal before assuming it works.
Scenario #4: Disk Is 95% Full
This is where many administrators make dangerous mistakes.
Don't immediately start deleting files.
First identify the problem.
df -h
Then:
sudo du -sh /* 2>/dev/null | sort -rh | head -20
Drill deeper:
sudo du -sh /var/* 2>/dev/null | sort -rh | head -20
Common culprits include:
- Nginx/Apache logs
- systemd journal logs
- database binary logs
- old backups
- temporary files
- application-generated files
Clean safely.
For example:
sudo apt clean
sudo journalctl --vacuum-time=7d
Then investigate log rotation.
The real solution isn't:
“I deleted some files.”
It's:
“I identified the source of disk growth and implemented log rotation, backup retention and monitoring so the problem doesn't return.”
That's the difference between incident response and systems administration.
Scenario #5: Database Connection Errors
Multiple websites suddenly report:
Cannot connect to database.
Start with:
sudo systemctl status mysql
Check the logs:
sudo tail -50 /var/log/mysql/error.log
Check disk:
df -h
Check memory:
free -h
Look for OOM events:
dmesg | grep -i "oom\|killed process"
If MySQL is running but applications can't connect, investigate:
- credentials
- database existence
- user permissions
- connection limits
- host restrictions
- application configuration
Test directly:
mysql -u appuser -p -h localhost database_name
Then:
SHOW STATUS LIKE 'Threads_connected';
And:
SHOW GRANTS FOR 'appuser'@'localhost';
Again, don't jump to:
systemctl restart mysql
Understand why connections are failing.
Scenario #6: Migrating 15 Websites
This is where planning matters more than commands.
A migration should look something like:
Before migration
Inventory:
- domains
- DNS records
- databases
- application versions
- PHP versions
- web-server configuration
- SSL certificates
- cron jobs
- firewall rules
- backups
Lower DNS TTL before migration.
For example:
300 seconds
Prepare the new server.
Then perform an initial data synchronization.
For example:
rsync -avz /var/www/ user@NEW_SERVER:/var/www/
Import databases.
Test websites against the new server before changing DNS.
A useful technique is testing through the local hosts file.
Then:
- Final sync
- Final database migration
- DNS change
- Verify applications
- Monitor logs
- Keep the old server available as rollback
The goal isn't simply:
“Move the websites.”
The goal is:
Move the websites while minimizing risk and maintaining a rollback path.
Scenario #7: The Server Is Under Attack
First determine what you're dealing with.
Look at traffic:
awk '{print $1}' /var/log/nginx/access.log \
| sort | uniq -c | sort -rn | head -20
Check connections:
ss -s
For HTTP connections:
ss -ant | grep ':80' | wc -l
But remember:
Not every traffic spike is a DDoS attack.
It could be:
- legitimate traffic
- a broken client
- a crawler
- a brute-force attack
- an application bug
- a real DDoS
For application-layer attacks, rate limiting can help.
For larger attacks, move protection upstream.
A service such as Cloudflare can provide:
- WAF
- rate limiting
- bot protection
- DDoS mitigation
The key interview answer:
“I would identify the attack pattern first, apply the least disruptive mitigation available, involve the provider or upstream DDoS protection when necessary, and then implement permanent controls.”
The 10 Commands I Want Every SysAdmin to Know
If you remember nothing else, remember these:
uptime
free -h
df -h
htop
ss -tlnp
systemctl status nginx
journalctl -u nginx
nginx -t
tail -f /var/log/nginx/error.log
lsof -i :80
They answer some of the most important questions:
Is the server healthy?
uptime
free -h
df -h
What's consuming resources?
htop
What's listening?
ss -tlnp
Is the service healthy?
systemctl status nginx
What went wrong?
journalctl -u nginx
Is my configuration valid?
nginx -t
What's happening right now?
tail -f /var/log/nginx/error.log
What's using the port?
lsof -i :80
The Two-Week Interview Plan
Don't spend two weeks just reading.
Build.
Week 1
Day 1: Linux commands
Day 2: Users, permissions and SSH
Day 3: Apache
Day 4: Nginx
Day 5: DNS
Day 6: SSL
Day 7: PHP and PHP-FPM
Week 2
Day 8: MySQL/MariaDB
Day 9: Monitoring
Day 10: Firewall and security
Day 11: Backups and cron
Day 12: Docker
Day 13: Cloud and Git
Day 14: Scenario practice
Every day:
1 hour theory
2 hours hands-on
1 hour interview practice
And don't just read answers.
Say them out loud.
Build Your Own Production-Like Lab
A cheap Ubuntu VM is enough to learn the fundamentals.
Install:
- Nginx
- PHP-FPM
- MySQL
- Docker
- Git
- UFW
- Fail2ban
Then deliberately break things.
Stop Nginx.
Fill the disk.
Break a configuration file.
Stop PHP-FPM.
Change a database password.
Break DNS.
Expire a certificate.
Kill a process.
Then recover.
That is where real learning happens.
The Golden Rule of Troubleshooting
When something breaks:
Don't panic.
Don't guess.
Don't restart everything.
Use:
Verify → Isolate → Inspect → Fix → Verify → Prevent
And remember five things interviewers want to hear:
1. Systematic thinking
You investigate before changing things.
2. Security
You don't use root unnecessarily.
You don't expose databases publicly.
You don't give developers root access.
3. Backups
Before risky changes:
Have a rollback plan.
4. Communication
During incidents, stakeholders need updates.
5. Prevention
Fixing today's problem isn't enough.
Ask:
“How do we make sure this doesn't happen again?”
That's what separates a command runner from a system administrator.
Final Interview Advice
When asked:
“Tell me about your experience.”
Don't give a list of technologies.
Tell a story.
Instead of:
“I know Linux, Nginx, MySQL, AWS and Docker.”
Say:
“I manage Linux-based servers and web applications, including Nginx/Apache, PHP-FPM and databases. I handle deployments, SSL, DNS, backups, monitoring and security. When incidents occur, I troubleshoot systematically using logs, system metrics and service health checks, then focus on preventing the same issue from happening again.”
Technology tells them what you know.
Problem-solving tells them why they should hire you.
The best SysAdmins aren't the people who know the most commands.
They're the people who can stay calm at 11 PM, find the signal inside the noise, restore service safely, and explain exactly what happened afterward.
Learn the commands.
Practice the scenarios.
Build the habit of thinking in systems.
That's how you become interview-ready.
Part 7: Scenario Questions, Study Plan & Quick Reference
7.1 Scenario-Based Interview Questions (MOST IMPORTANT)
[!IMPORTANT]
Interviewers love scenario questions because they test real-world problem-solving. Practice explaining these OUT LOUD.
Scenario 1: Website is Down
Q: "It's 11 PM and a client reports their website is down. Walk me through your troubleshooting process."
Answer:
1. VERIFY the issue
- Try accessing the site myself from browser + curl
- Check if it's site-specific or all sites on the server
- Ping the server IP
2. CHECK server connectivity
- SSH into the server (if can't → check provider's console)
- Run: uptime, free -h, df -h, top
3. CHECK web server
- systemctl status nginx (or apache2)
- If stopped → systemctl start nginx → check logs for why it stopped
4. CHECK error logs
- tail -50 /var/log/nginx/error.log
- tail -50 /var/log/php8.2-fpm.log
5. CHECK PHP-FPM (if PHP site)
- systemctl status php8.2-fpm
- If 502 → restart PHP-FPM
6. CHECK database
- systemctl status mysql
- If site shows DB error → restart MySQL, check credentials
7. CHECK disk space
- df -h → if full → find and clean large files/logs
8. CHECK for recent changes
- Did someone deploy code? Change config? Update server?
9. COMMUNICATE
- Update client with status and ETA
- Document the incident
Scenario 2: Server is Slow
Q: "Users report the website is very slow. How do you investigate?"
Answer:
1. CHECK server resources
- htop → CPU usage, RAM usage, load average
- free -h → is swap being used heavily?
- iostat → disk I/O bottleneck?
2. CHECK what's consuming resources
- ps aux --sort=-%cpu | head → top CPU processes
- ps aux --sort=-%mem | head → top RAM processes
3. CHECK web server
- Access log analysis: are there too many requests? Bot traffic?
- awk '{print $1}' access.log | sort | uniq -c | sort -rn | head
4. CHECK database
- SHOW PROCESSLIST → stuck/slow queries?
- Enable slow query log
- Check if indexes are missing
5. CHECK PHP
- PHP-FPM status → are all workers busy?
- Check PHP error log for warnings
- Check if OPcache is enabled
6. CHECK network
- Is bandwidth maxed? → nload, vnstat
- Is there a DDoS attack? → check access logs for patterns
7. QUICK FIXES
- Kill stuck processes
- Restart PHP-FPM (clears memory leaks)
- Enable caching (Redis, OPcache, Nginx cache)
- Block abusive IPs with fail2ban or UFW
8. LONG-TERM
- Scale server (more CPU/RAM)
- Add CDN (Cloudflare)
- Optimize database queries
- Implement application-level caching
Scenario 3: SSL Certificate Expired
Q: "A client's SSL certificate has expired and users are seeing security warnings. What do you do?"
Answer:
1. IDENTIFY which certificate
- echo | openssl s_client -connect domain.com:443 2>/dev/null | openssl x509 -noout -dates
2. RENEW the certificate
- If Let's Encrypt: sudo certbot renew --force-renewal
- If paid cert: generate new CSR, submit to provider, download new cert
3. INSTALL/VERIFY
- sudo nginx -t && sudo systemctl reload nginx
- Verify in browser: check padlock icon
4. PREVENT recurrence
- Verify certbot timer: sudo systemctl status certbot.timer
- Or set up monitoring: SSL expiry alert 30 days before
- Test auto-renewal: sudo certbot renew --dry-run
Scenario 4: Disk Space Full
Q: "You receive an alert that the server's disk is 95% full. What steps do you take?"
Answer:
1. IDENTIFY what's consuming space
- df -h (which partition is full?)
- du -sh /* | sort -rh | head -20
- Then drill down: du -sh /var/* | sort -rh | head -20
2. QUICK CLEANUP
- sudo apt clean # Clear apt cache
- sudo journalctl --vacuum-time=7d # Clear old systemd logs
- find /var/log -name "*.gz" -delete # Delete compressed old logs
- find /tmp -type f -mtime +7 -delete # Clean temp files
- Check /var/log for huge log files → truncate or rotate
3. CHECK for common culprits
- Large log files: /var/log/apache2/access.log, error.log
- Old backups still on server
- MySQL binary logs: PURGE BINARY LOGS BEFORE '2024-01-01'
- Mail queue: mailq → clear if large
4. PREVENT recurrence
- Set up logrotate for all logs
- Move backups to S3/remote storage
- Set up disk space alert at 80%
- Add cron to clean old files
Scenario 5: Database Connection Errors
Q: "Multiple websites are showing 'Cannot connect to database'. How do you fix this?"
Answer:
1. CHECK MySQL status
- sudo systemctl status mysql
- If stopped → sudo systemctl start mysql
- Check: sudo tail -50 /var/log/mysql/error.log
2. IF MySQL won't start
- Check disk space: df -h
- Check RAM: free -h (OOM killer may have killed MySQL)
- Check: sudo dmesg | grep -i "oom\|mysql"
- Try: sudo mysqld_safe &
3. IF MySQL is running but connections fail
- Check max connections: SHOW STATUS LIKE 'Threads_connected';
- If maxed: kill idle connections, increase max_connections
- Check credentials in website config files (.env, wp-config.php)
- Test: mysql -u appuser -p -h localhost database_name
4. IF one site works but another doesn't
- Check database-specific credentials
- Check if specific database exists
- Check user permissions: SHOW GRANTS FOR 'user'@'localhost';
Scenario 6: Server Migration
Q: "We need to migrate 15 websites from an old server to a new server with zero downtime. How?"
Answer:
1. PLAN (1-2 days before)
- Inventory: list all domains, databases, configs, SSL certs
- Set up new server with same software stack
- Lower DNS TTL to 300 seconds (do this early!)
2. PREPARE NEW SERVER
- Install: OS updates, Nginx/Apache, PHP (same version), MySQL
- Configure: firewall, SSH, fail2ban
- Set up same PHP extensions and configurations
3. SYNC DATA (night before)
- rsync website files (first sync - bulk transfer)
- Export all databases
- Copy SSL certificates, configs, crontabs
4. MIGRATION DAY
- Final rsync (only changed files, very fast)
- Final database dump and import
- Copy latest configs
- Test each site on new server (use hosts file to test)
5. DNS SWITCH
- Update A records to new server IP
- Monitor propagation: dnschecker.org
6. VERIFY
- Test all 15 sites on new server
- Test SSL, forms, databases, email
- Monitor error logs for 24-48 hours
7. POST-MIGRATION
- Keep old server running 7 days as fallback
- Raise DNS TTL back to normal
- Update all documentation
Scenario 7: Server Under Attack
Q: "The server is being hit by a DDoS attack. What do you do?"
Answer:
1. IDENTIFY the attack
- Check access logs for patterns:
awk '{print $1}' /var/log/nginx/access.log | sort | uniq -c | sort -rn | head -20
- Check: ss -s (total connections)
- Check: netstat -an | grep :80 | wc -l
2. IMMEDIATE ACTIONS
- Block top attacking IPs:
sudo ufw deny from ATTACKER_IP
- Enable rate limiting in Nginx:
limit_req_zone $binary_remote_addr zone=one:10m rate=10r/s;
3. CLOUDFLARE (if available)
- Enable "Under Attack Mode"
- Set up rate limiting rules
- Block suspicious countries/ASNs
- Enable Bot Fight Mode
4. SERVER-LEVEL
- Configure fail2ban for HTTP flood
- Increase worker_connections in Nginx
- Enable connection limiting
5. LONG-TERM
- Set up Cloudflare on all domains
- Configure WAF rules
- Set up monitoring alerts for traffic spikes
More Rapid-Fire Scenario Questions
| Scenario | Key Actions |
|---|---|
| PHP upgrade needed | Install new PHP alongside old, test sites, update Nginx/Apache fastcgi_pass, remove old version |
| Email not being delivered | Check SPF/DKIM/DMARC, check mail logs, check blacklist status (mxtoolbox), verify port 25/587 open |
| Cron job not running | Check grep CRON /var/log/syslog, verify path, check permissions, test command manually |
| MySQL table crashed |
REPAIR TABLE tablename, or restore from backup if repair fails |
| Server rebooted unexpectedly | Check last reboot, check dmesg, check /var/log/syslog, check OOM killer, check provider status |
| New website deployment | Create vhost, set up DNS, create DB + user, deploy code, fix permissions, install SSL, test |
| Developer needs database access | Create MySQL user with limited permissions, never give root. GRANT SELECT, INSERT, UPDATE on db.* TO 'dev'@'ip'
|
| Backup restoration needed | Verify backup integrity, create fresh DB, import SQL, update config, fix permissions, test |
7.2 Two-Week Study Plan (Zero to Interview-Ready)
Week 1: Core Skills
| Day | Topic | Practice |
|---|---|---|
| Day 1 | Linux commands, file operations | Set up Ubuntu VM, practice all commands from Part 1 |
| Day 2 | Users, permissions, SSH | Create users, set permissions, configure SSH keys & hardening |
| Day 3 | Apache configuration | Install Apache, create 3 virtual hosts, set up .htaccess |
| Day 4 | Nginx configuration | Install Nginx, create 3 server blocks, set up reverse proxy |
| Day 5 | DNS & Domains | Set up a domain with all record types (use free domains or Cloudflare) |
| Day 6 | SSL Certificates | Install Let's Encrypt on both Apache & Nginx, practice troubleshooting |
| Day 7 | PHP & PHP-FPM | Install PHP, configure php.ini, set up PHP-FPM with Nginx |
Week 2: Advanced Skills
| Day | Topic | Practice |
|---|---|---|
| Day 8 | MySQL/MariaDB | Install, create databases/users, backup/restore, slow query log |
| Day 9 | Server monitoring | Practice htop, disk analysis, log analysis, set up monitoring |
| Day 10 | Firewall & Security | Configure UFW, install fail2ban, SSH hardening, security audit |
| Day 11 | Backup & Cron | Write backup scripts, set up cron jobs, test restore |
| Day 12 | Docker basics | Install Docker, run containers, create docker-compose.yml |
| Day 13 | Cloud & Git | Deploy on DigitalOcean, set up Git deployment workflow |
| Day 14 | Scenario practice | Review all scenarios, practice explaining solutions out loud |
Daily Routine
Morning (1 hour): Read theory for today's topic
Afternoon (2 hours): Hands-on practice on VM/VPS
Evening (1 hour): Review interview Q&A, practice explaining answers
7.3 Hands-On Lab Setup
Option A: Local VM (Free)
# 1. Download VirtualBox: virtualbox.org
# 2. Download Ubuntu Server 22.04 LTS ISO
# 3. Create VM: 2 CPU, 2GB RAM, 20GB disk
# 4. Install Ubuntu Server
# 5. Practice everything locally
# Network setup for SSH from host:
# VirtualBox → Settings → Network → Adapter 1 → Bridged Adapter
# OR Port Forwarding: Host 2222 → Guest 22
ssh -p 2222 user@localhost
Option B: DigitalOcean (Paid but realistic)
# 1. Sign up at digitalocean.com (get $200 free credit with referral)
# 2. Create a $6/month Droplet: Ubuntu 22.04 LTS
# 3. SSH in: ssh root@YOUR_DROPLET_IP
# 4. Practice everything on real cloud server
# 5. Destroy when done to stop billing
7.4 Critical Commands Cheat Sheet
# === SERVER STATUS ===
uptime # Uptime + load average
free -h # Memory usage
df -h # Disk space
htop # Interactive process viewer
ss -tlnp # Listening ports
# === SERVICE MANAGEMENT ===
systemctl status nginx # Check service
systemctl restart nginx # Restart service
systemctl reload nginx # Reload config (zero downtime)
systemctl enable nginx # Start on boot
journalctl -u nginx -f # Follow service logs
# === WEB SERVER ===
nginx -t # Test Nginx config
apache2ctl configtest # Test Apache config
tail -f /var/log/nginx/error.log # Follow error log
# === DNS ===
dig example.com # DNS lookup
dig @8.8.8.8 example.com # Lookup via Google DNS
dig example.com MX # Mail records
dig TXT _dmarc.example.com # DMARC record
# === SSL ===
certbot --nginx -d example.com # Get SSL cert
certbot renew --dry-run # Test renewal
openssl s_client -connect example.com:443 # Check SSL
# === DATABASE ===
mysql -u root -p # Login
mysqldump -u root -p dbname | gzip > backup.sql.gz # Backup
gunzip < backup.sql.gz | mysql -u root -p dbname # Restore
SHOW PROCESSLIST; # Running queries
# === FIREWALL ===
ufw status # Check firewall
ufw allow 80/tcp # Allow HTTP
ufw deny from 1.2.3.4 # Block IP
fail2ban-client status sshd # Check banned IPs
# === FILES & PERMISSIONS ===
chown -R www-data:www-data /var/www/ # Fix ownership
chmod 755 /var/www/html # Dir permissions
chmod 644 /var/www/html/index.html # File permissions
find /var/www -type f -perm 0777 # Find insecure files
# === TROUBLESHOOTING ===
tail -f /var/log/syslog # System log
dmesg | tail # Kernel messages
grep "error" /var/log/nginx/error.log # Search for errors
lsof -i :80 # What's using port 80
7.5 Documentation Template
Server Inventory Template
# Server: production-web-01
## Server Details
- Provider: DigitalOcean
- IP: 192.168.1.100
- OS: Ubuntu 22.04 LTS
- CPU: 4 vCPUs
- RAM: 8 GB
- Disk: 160 GB SSD
## Software Stack
- Nginx 1.22
- PHP 8.2-FPM
- MySQL 8.0
- Redis 7.0
- Node.js 20 LTS
## Hosted Domains
| Domain | Type | Document Root | Database | SSL |
|--------|------|---------------|----------|-----|
| example.com | WordPress | /var/www/example.com | example_db | Let's Encrypt |
| app.company.com | Laravel | /var/www/app | app_db | Let's Encrypt |
| api.company.com | Node.js | Port 3000 | N/A | Let's Encrypt |
## Backups
- Database: Daily at 2 AM, retained 30 days
- Files: Weekly Sunday 3 AM, retained 12 weeks
- Location: S3 bucket: s3://company-backups/production/
## Access
- SSH: Port 2222, key-based only
- Users: john (sudo), deploy (limited)
## Monitoring
- UptimeRobot: All domains monitored
- Disk alert: > 80%
- CPU alert: > 90% for 5 minutes
## Last Incidents
| Date | Issue | Resolution | Duration |
|------|-------|------------|----------|
| 2024-01-15 | Disk full | Cleaned old logs | 15 min |
| 2024-02-03 | MySQL crashed | OOM, increased RAM | 30 min |
Incident Report Template
# Incident Report: [Brief Description]
## Summary
- Date/Time: 2024-01-15 23:30 IST
- Duration: 45 minutes
- Impact: example.com was unreachable
- Severity: High
## Timeline
- 23:30 - Alert received: example.com is down
- 23:32 - SSHed into server
- 23:33 - Found: Nginx running but PHP-FPM stopped
- 23:34 - Checked logs: OOM killer killed PHP-FPM
- 23:35 - Restarted PHP-FPM, site came back up
- 23:40 - Investigated: memory leak in custom plugin
- 00:15 - Increased server RAM, disabled problematic plugin
## Root Cause
A WordPress plugin had a memory leak, causing PHP-FPM workers to consume
all available RAM. The OOM killer terminated PHP-FPM processes.
## Resolution
1. Restarted PHP-FPM
2. Disabled the problematic plugin
3. Increased server RAM from 4GB to 8GB
4. Set pm.max_requests = 500 to restart workers periodically
## Prevention
- Set up memory usage alerting at 80%
- Added pm.max_requests to PHP-FPM config
- Scheduled weekly plugin updates and review
7.6 Final Tips for the Interview
[!TIP]
How to answer "Tell me about your experience":
- "I have X years managing Linux servers running Ubuntu with Nginx/Apache, PHP-FPM, and MySQL"
- "I manage Y domains across Z servers on [DigitalOcean/AWS]"
- "I handle SSL certificates, DNS management, server security, and automated backups"
- "I monitor server health including CPU, RAM, disk, and uptime using [tools]"
- Mention specific scenarios you've resolved
[!IMPORTANT]
Key behaviors interviewers look for:
- Systematic troubleshooting - Don't jump to random fixes. Check logs first
- Security mindset - Always mention security considerations
- Backup awareness - Always mention backup before making changes
- Communication - Mention updating stakeholders during incidents
- Documentation - Mention documenting changes and incidents
- Proactive approach - Mention monitoring, alerts, and prevention
[!CAUTION]
Common interview mistakes to avoid:
- Don't say "I would Google it" - show you know the commands
- Don't say "rm -rf /" as a joke - shows carelessness
- Don't say "just restart the server" for everything - shows lack of depth
- Don't admit to using root for everything - shows bad security practice
- Don't forget to mention testing config before restarting (
nginx -t,apache2ctl configtest)
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