Linux

Converting crt to PEM

Byetzion 04/10/2006

Took two steps:

openssl x509 -in input.crt -out input.der -outform DER

openssl x509 -in input.der -inform DER -out output.pem -outform PEM

General Hardware | Linux

RHEL4 can see only 8 cores out of 16 cores server
Byetzion 21/05/2008

I have encountered it on several cases. RedHat Linux ES, by default, uses smp kernel which is limited to eight cores, or two sockets. You find out that your multi-socket hardware, with its 16 (or more…) cores show you only the first eight, both by the simple method of running ‘top‘ and then pressing on…

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Linux

VMware Perl SDK bug and workaround
Byetzion 10/11/2007

During an attempt to use the VMware Perl SDK, I have encountered the following error: VMControl Panic: SSLLoadSharedLibrary: Failed to load library /usr/bin/libcrypto.so.0.9.7:/usr/bin/libcrypto.so.0.9.7: cannot open shared object file: No such file or directory This is weird, as it was compiled successfully on my system (Centos4), but still… The workaround was to create two symlinks: ln…

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Linux

Windows 7 hammering dnsmasq
Byetzion 01/02/2014

I migrated to dnsmasq just yesterday, and discovered that a Windows 7 machine was hammering the server with messages like this: Feb 1 11:06:07 dns dnsmasq-dhcp[1078]: DHCPINFORM(eth0) 192.168.1.77 91:de:87:7b:e5:a8 Feb 1 11:06:07 dns dnsmasq-dhcp[1078]: DHCPACK(eth0) 192.168.1.77 91:de:87:7b:e5:a8 winpc Googling a bit, I found out this link (with an explanation). The solution is fairly simple. Add…

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Disk Storage | Linux

Hot-Adding SAN lun to Linux (RH with Qlogic drivers)
Byetzion 18/09/2006

cat /proc/scsi/qla2xxx/$Z” where Z represents the SCSI interface the Qlogic has taken for itself, you’ll get something like this: <Snip> . . </Snip> SCSI LUN Information: (Id:Lun) * – indicates lun is not registered with the OS. ( 0: 0): Total reqs 63185608, Pending reqs 0, flags 0x2, 0:0:81 00 Assuming you’ve just added the…

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Disk Storage | Linux

dm-multipath and loss of all paths
Byetzion 13/05/2008

dm-multipath is a great tool. Its abilities were proven to me on many occasions, and I’m sure I’m not the only one. NetApp, for example, use it. HP use it as well (a slightly modified version, and still), and it works. A problem I have encountered is as follow – if a single path fails,…

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Linux | Scripting/Programming

Customizing the Anaconda Installer Boot Image with product.img
Byetzion 04/02/202504/02/2025

Red Hat’s Anaconda installer, used by Red Hat Enterprise Linux, Oracle Linux, and other RHEL-like distributions, offers a powerful customization method through an additional product.img file. This technique allows you to modify the first boot sequence with relative ease. What is product.img? The product.img is an additional image file that can be used to override…

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