Time Zones and Remote ServersTime Zones and Remote Servers
It’s widely regarded that the best practice is to set the time zone of a server to UTC if people are going to be doing sys-admin work from various countries.[...]
Category: unix-tips
The Date Command and Seconds Since 1970-01-01The Date Command and Seconds Since 1970-01-01
The man page for the date command says that the %s option will give “seconds since 1970-01-01 00:00:00 UTC“. I had expected that everything that date did would give output[...]
Resizing the Root FilesystemResizing the Root Filesystem
Uwe Hermann has described how to resize a root filesystem after booting from a live-cd or recovery disk [1]. He makes some good points about resizing an LVM PV (which[...]
Redirecting Output from a Running ProcessRedirecting Output from a Running Process
Someone asked on a mailing list how to redirect output from a running process. They had a program which had been running for a long period of time without having[...]
Load AverageLoad Average
Other Unix systems apparently calculate the load average differently to Linux. According to the Wikipedia page about Load(computing) [1] most Unix systems calculate it based on the average number of[...]
Swap SpaceSwap Space
There is a wide-spread myth that swap space should be twice the size of RAM. This might have provided some benefit when 16M of RAM was a lot and disks[...]
Out Of Memory Errors and ApacheOut Of Memory Errors and Apache
I’ve been having problems with one of my Xen virtual servers crashing with kernel error messages regarding OOM conditions. One thing I had been meaning to do is to determine[...]
Pointers in Bash Shell ScriptsPointers in Bash Shell Scripts
# foo=bar # name=foo # echo ${!name} bar The above example shows how to make a bash environment variable reference the value of another. # echo ${!f*} foo fs_abc_opts fs_name[...]