Operating Systems - Spheron1

February 6, 2012

Regenerate statistics in Parallels Plesk for Linux

Every night Parallels Plesk for Linux servers run a cron job to process various log files and generate statistics. This includes generating the HTML for the AWStats or Webalizer log analysis packages used for the Plesk “web statistics” features as well as updating the disk usage and bandwidth usage for each domain. Sometimes you need to re-run this task, such...

Linux/Plesk Comments: 0

September 5, 2011

Windows Server 2008 with multiple IP addresses on one NIC

If you are running a Windows Server 2008 installation with multiple IP addresses on one interface then you might be surprised to know that the default behaviour when selecting the IP address to use for outbound connections has changed compared to Windows Server 2003. Previously, the “main” IP address on the adapter would have been used for initiating outbound connections...

Windows Comments: 2

June 26, 2011

EPEL NSD RPM and the missing PID file directory

NSD is a fantastic authoritative nameserver from NLnet Labs which was developed in conjunction with the RIPE NCC to be a highly scalable, secure authoritative nameserver which has no recursive features by design. In fact, it is such as good nameserver that it is used on three of the root namesevers (k.root-servers.net, h.root-servers.net and l.root-servers.net). Thanks to the EPEL project...

Red Hat and CentOS Comments: 0

March 20, 2011

Recovering Logical Volumes deleted with lvremove

Need to recover an LVM Logical Volume that you deleted by mistake? No problem, luckily LVM archives all of the old Logical Volume and Volume Group metadata in /etc/lvm/archive/ whenever you use something like lvremove to make adjustments to the Logical Volumes. Before you start, remember that any kind of operation like this is potentially dangerous and so backup anything...

Linux Comments: 6

December 27, 2010

Parallels Plesk for Windows upgrade and lots of session files

Be careful when running the Parallels Plesk update utility on Windows servers if you have a large number of files in “C:\Program Files (x86)\Parallels\Plesk\admin\sessions” as once it has finished the upgrade the utility will try and clear this directory before letting you do anything else, including the mandatory reboot. It seems that it is quite easy for there to be...

Plesk/Windows Comments: 0

November 9, 2010

Using kill to display dd progress

How long has that dd process been running for now? Is it even doing anything? How long is it going to take? If you want dd to give you a progress update, then find out the process ID (PID) and then send the USR1 signal to it with kill -USR1 And dd will then print out the same records in/out,...

Red Hat and CentOS Comments: 0

September 16, 2010

The dreaded scrolling GRUB GRUB GRUB on startup

Rebooting a server is always stressful, particularly when you don’t have immediate physical access to it. Of course, when the server inevitably doesn’t come back up you need to either get directly on the local console or connect in via KVMoIP and one of the worst things you can see is “GRUB GRUB GRUB” scrolling past endlessly. This is a...

Red Hat and CentOS Comments: 0

September 12, 2010

Python setuptools and get_python_version is not defined

If you run into the below error when using setuptools (setup.py), then it’s quite possible that you’re using an outdated version of Python’s setuptools. In particular, the python-setuptools package in the CentOS yum repository is too old. Traceback (most recent call last): File “setup.py”, line 19, in ? setup(**metadata) File “/usr/lib64/python2.4/distutils/core.py”, line 149, in setup dist.run_commands() File “/usr/lib64/python2.4/distutils/dist.py”, line 946,...

Red Hat and CentOS Comments: 0

August 16, 2010

Sysconfig ifcfg scripts and VLAN sub-interfaces

If you are using the ifcfg scripts in /etc/sysconfig/network-scripts to bring up VLAN sub-interfaces on a NIC and you are getting messages such as: Bringing up interface eth0.200: Device eth0.200 does not seem to be present, delaying initialization. instead of Bringing up interface eth0.200: Added VLAN with VID == 200 to IF -:eth0:- as you would expect, then make sure...

Red Hat and CentOS Comment: 1

August 16, 2010

HyperVM and yum update Transaction Check Errors

If you’re having file conflict problems when running “yum update” on servers with the lxlabsupdate repository for HyperVM (or Kloxo) installed then there’s a simple resolution: cd /var/cache/yum/lxlabsupdate/packages/ rpm -Uvh *.rpm –replacefiles –replacepkgs This should fix errors such as: file /usr/share/man/man1/pcregrep.1.gz from install of pcre-8.02-1.el5_5.1.x86_64 conflicts with file from package pcre-6.6-2.el5_1.7.i386 file /usr/share/man/man1/pcretest.1.gz from install of pcre-8.02-1.el5_5.1.x86_64 conflicts with file...

Red Hat and CentOS Comments: 0

Category: Operating Systems

Regenerate statistics in Parallels Plesk for Linux

Windows Server 2008 with multiple IP addresses on one NIC

EPEL NSD RPM and the missing PID file directory

Recovering Logical Volumes deleted with lvremove

Parallels Plesk for Windows upgrade and lots of session files

Using kill to display dd progress

The dreaded scrolling GRUB GRUB GRUB on startup

Python setuptools and get_python_version is not defined

Sysconfig ifcfg scripts and VLAN sub-interfaces

HyperVM and yum update Transaction Check Errors