A while ago I wrote a blog post debunking the idea that swap should be twice as large as RAM . The issue of swap size has come up for discussion in a mailing list so it seems that it’s worth another blog post.
In my previous post I suggested making swap space [...]
I’ve just installed BTRFS on some systems that matter to me. It is still regarded as experimental but Oracle supports it with their kernel so it can’t be too bad – and it’s almost guaranteed that anything other than BTRFS or ZFS will lose data if you run as many systems as I do. Also [...]
I run some servers that use the DJB Daemontools to manage their daemons . This is something I would have changed years ago if given a chance because DJB software always seems to do things in a different way to other Unix software and causes pain. Unfortunately when you have a lot of semi-embedded systems [...]
In my post about getting started with KVM I noted the fact that I had problems keeping screen output after the program exits .
The following snippet of shell code demonstrates the solution I’ve discovered for this problem. It determines whether SCREEN is the parent process of the shell script and if so it sleeps [...]
I recently had the misfortune to be compelled to install Proftpd on SCO Unix. There’s nothing wrong with Proftpd of course, but everything is wrong with SCO.
LDFLAGS=-L/usr/ucblib ./configure –libdir=/usr/ucblib --enable-builtin-getnameinfo
To get it to compile the above ./configure line is needed. It uses /usr/ucblib because having the basic BSD sockets API residing in a [...]
When writing a shell script you need to take some care to ensure that it won’t run amok. Extra care is needed for shell scripts that run as root, firstly because of the obvious potential for random destruction, and secondly because of the potential for interaction between accounts that can cause problems.
One possible first [...]
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. I’m currently running some RHEL4 servers that are set to Los Angeles time. So I have to convert the time from Melbourne time to UTC [...]
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 in my time zone unless I requested otherwise.. But it seems that in this case the result is in UTC, and the same seems to [...]
Uwe Hermann has described how to resize a root filesystem after booting from a live-cd or recovery disk . He makes some good points about resizing an LVM PV (which I hadn’t even realised was possible).
The following paragraph is outdated, see the update at the end: Incidentally it should be noted that if your [...]
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 stdout redirected to a file. They wanted to logout (to move the laptop that was used for the ssh session) but not kill the process [...]