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uptime # uptime and CPU stress
w # or better yet:last |head # who is/has been in
netstat -tlpn # find server role
df -h # out of disk space?
grep kill /var/log/messages # out of memory?
ps auxf # what's running
htop # stressed? , look out for D (waiting on I/O typically) processes
history # what has changed recently
tail /var/log/application.log # anything interesting logged?
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