Author Archives: Jens Kuehnel

For the Apple hater

I bought an IPhone for my mum this morning and had an interesting experience. Firefox on Mac showed the shop with a  “Please wait” sign, and with Safari the shop was open and ready to order. I Pressed Ctrl+Shift+r for … Continue reading

Posted in personal | Tagged | 2 Comments

Enterprise Software

I have seen a lot of broken and bad RPM packages. From vmware packages that contains one big tarfile and the rpm-postscript uncompressed this into a directory. To test scripts from Oracle DB 11.2 that does not detect the 32bit … Continue reading

Posted in Enterprise Linux, Linux, Uncategorized | Tagged | 3 Comments

That happens if you put to much output on your serial console

We searched for multiple days why one of our cluster machines was hanging for a couple of seconds, before it was fenced. We found out that the iptables LOG did put to much output onto the serial. I wrote a … Continue reading

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Oracle vs. Centos

As a lot of people have noticed Oracle is offering a “conversion” script to move from Centos to Oracle Linux. Of course it is not really a conversion, it only moves the yum repos from Centos to Oracle. The existing … Continue reading

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new packages for my default install

In the last couple of week I added 3 new packages to my default install: 1.) atop is a very good extension of top, it includes disk and network utilization among other things. 2.) mosh is a ssh replacement / … Continue reading

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yum behind proxy gets “No more mirrors to try”

Have you ever had the problem with “No more mirrors to try” when behind a caching proxy? Especially with rpmfusion? You tried yum clean all, and still you are not able to download the xml or sqlite db? To fix … Continue reading

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certwatch

Because I just fell into the “forgot the renew my cert” trap again. One very important hint. Install crypto-utils on all machines where ssl-certs are used. It will check automatically all  certs that are used by httpd.

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Enable serial console with systemd

If you need to enable a serial console on a systemd machine like Fedora 16, you have two possibilities. Start it immediately with: systemctl start getty@ttyS0.service or start it at every boot with: ln -s /usr/lib/systemd/system/getty@.service   /etc/systemd/system/getty.target.wants/getty@ttyS0.service

Posted in Fedora, Linux | Tagged | 3 Comments

Oracle Linux UEK broken

Hi, after my post Centos vs. ScientificLinux  which included Oracle Linux, I played around with OL6. The default kernel running is the “Unbreakable Enterprise Kernel” (UEK). This kernel is based on 2.6.39 and is currently the only Linux kernel that is … Continue reading

Posted in Enterprise Linux, Linux | Tagged | 1 Comment

Centos vs. ScientificLinux

I’ve been asked by a lot of people why I switched from Centos to ScientificLinux. My feeling was that ScientificLinux delivers security updates faster and more reliably, but feeling is not a good adviser when it comes to security. So … Continue reading

Posted in Enterprise Linux, Fedora, Linux | Tagged | 6 Comments