Monitor & Troubleshoot
1.Monitor Process
#top
2.Monitor Network
#netstat -tulp (t=tcp, u=utp, l=listening, p=program)
3.Monitor Log
#tail /var/log/message =System logs
#tail /var/log/maillog =mail server logs
#tail /var/log/httpd/ =Web server logs
#tail /var/log/secure =Authentication logs
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firewall-cmd --reload
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sovle IT Problem
1/ monitor:
- Date/time
- log, report....
=> Clue
2/ Troubleshoot => Fix:
- Knowlede+skill
- google/Youtube => Keyword
- IT Teacher
- Expert /Vendor /listense
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cat /var/log/message = view full content |more
tail /var/log/message = view the end of content: view lastest new
head /var/log/message = view the first of content= view old log
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