uptime []

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Process Uptime
Server uptime
Apache uptime
mysql uptime

Process Uptime

Find the process ID of the master (parent process), then:

        
              ls -ld /proc/3380

Output looks like:

        
              dr-xr-xr-x 8 root root 0 Nov 12 23:05 /proc/3380

or

        
              ps -eo user,pid,cmd,etime,ppid | grep apache

        
              ps -eo user,pid,cmd,etime | grep service

Output is simlar:

        
              3380 nginx: master process /usr/  1-02:50:02
nginx: worker process          02:50:10
nginx: worker process          02:50:10
nginx: worker process          02:50:10
nginx: worker process          02:50:10
nginx: worker process          02:50:10
nginx: worker process          02:50:10
nginx: worker process          02:50:10
nginx: worker process          02:50:10

The bit we are interested in is the master process:

        
              3380 nginx: master process /usr/  1-02:50:02

This represents 1 days, 2 hours, 50 mins and 2 seconds

Server uptime

w

        
              uptime

Apache uptime

CentOS

        
              service httpd fullstatus

Ubuntu

        
              apache2ctl fullstatus

Sometimes the correct packages are not installed to run these commands
Alternative:

        
              grep -i resuming /var/log/httpd/error.log

        
              grep -i resuming /var/log/apache2/error.log

mysql uptime

You can use any of the following commands

        
              mysqladmin  version | grep -i uptime

or

        
              SHOW GLOBAL STATUS LIKE 'Uptime';

or

        
              mysql -e 'SHOW GLOBAL STATUS LIKE "Uptime"' | grep ''[[:digit:]]'' | awk '{ print $2 / 60 / 60 / 24 " days"}'