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Linux inetd and shell input redirection
I was required to write a small listener. This listener doesn’t have to do anything fancy – it has to process input from a network source (over TCP) and shove it into a file with random name. The quick...
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HP EVA SSSU and fixed LUN WWID
Linux works perfectly well with multiple storage links using dm-multipath. Not only that, but HP has released their own spawn of dm-multipath, which is optimized (or so claimed, but, anyhow, well...
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Xen VMs performance collection
Unlike VMware Server, Xen’s HyperVisor does not allow an easy collection of performance information. The management machine, called “Domain-0″ is actually a privileged virtual machine, and thus – get...
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Xen Networking – Bonding with VLAN Tagging
The simple scripts in /etc/xen/scripts which manage networking are fine for most usages, however, when your server is using bonding together with VLAN tagging (802.11q) you should consider an...
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Attach USB disks to XenServer VM Guest
There is a very nice script for Windows dealing with attaching XenServer USB disk to a guest. It can be found here. This script has several problems, as I see it. The first – this is a Windows batch...
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Two advanced bash tricks
Well, tricks is not the right word to describe advanced shell scripting usage, however, it does make some sense. These two topics are relevant to Bash version 4.0 and above, which is common for all...
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ZFS with Redhat Cluster Suite
This is a very nice project I have been working on. The hardware at hand – two servers, with a shared SAS bus containing several SAS disks. Since it’s a shared bus, no RAID solution would cut it, and...
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RaspberryPi Zero loses connectivity
I have had a problem with RPI Zero. The system was working fine, and then it did not. I am using Raspbery Linux (Debian-based) with kernel 5.10.17+. Once a while (usually with network load) the system...
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An excellent alternative to ‘rsync’ for backups to cloud
I have been using NextCloud for a long while now. It is a smart solution, and although I do not like its agent (I’ve had many problems with it around Hebrew file names on multiple types of operating...
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Preventing AutoFS from slowing down the system
I am using autofs (or automout) to handle shares presented on an NFS server I am using. When I am not home, or when the server is inaccessible, I do not want to be delayed by autofs failure to mount....
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