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Tag: ubuntu

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Check All Apache Virtual Host Logs on Ubuntu

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Sometimes I need to check all my virtual hosts on my Apache server.

The best way to do it is with a cat command like this

/var/log/apache2# cat *.access.log

If I want to keep observing the log I use the command tail as follows

/var/log/apache2# tail -f *.access.log

But if I want to check something more specific I can use a grep too

/var/log/apache2# cat *.access.log | grep root

This is a quick way to verify my logs without having to check them one by one.

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Load Averages on Ubuntu

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Many times you check your Ubuntu server and you see high load averages.

First number is 1 minute average, second one is 5 minute average and third one is 15 minute average.

~/backup# uptime
11:09:31 up 40 days, 17:38, 2 users, load average: 1.01, 0.66, 0.47
~/backup# cat /proc/loadavg
0.40 0.54 0.44 1/255 30135

Some interpretations:

  • If the averages are 0.0, then your system is idle.
  • If the 1 minute average is higher than the 5 or 15 minute averages, then load is increasing.
  • If the 1 minute average is lower than the 5 or 15 minute averages, then load is decreasing.
  • If they are higher than your CPU count, then you might have a performance problem (it depends).

What it means on Linux or Ubuntu is this:

On Linux, load averages are (or try to be) “system load averages“, for the  system as a whole, measuring the number of threads that are working and waiting to work (CPU, disk, uninterruptible locks). Put differently, it measures the number of threads that aren’t completely idle. Advantage: includes demand for different resources.

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