linux server – nixCraft

Debian / Ubuntu Linux apt-get: Blacklist a Package From Installing

September 29, 2012in Debian / Ubuntu last updated September 29, 2012

I‘ve build my own lighttpd .deb package and I do not want to upgrade it using the apt-get command. Also, I do not want to upgrade a few more packages such as php5-cgi, httpd and so on. How do I blacklist a package or packages so that when I run apt-get upgrade, it will ignore blacklisted packages and install the rest of updates under Debian or Ubuntu Linux server system?

Linux: Find Out What’s Using Up All Virtual Memory

August 12, 2012August 12, 2012in Linux, Troubleshooting last updated August 12, 2012

How do I list or display all processes, executables, and shared libraries that are using up all virtual memory under CentOS or Debian Linux server for troubleshooting purpose?

RHEL / Centos Linux Disable Firewall

June 27, 2012October 19, 2013in CentOS, Iptables, RedHat and Friends last updated October 19, 2013

How do I disable firewall on CentOS or Red Hat Enterprise Linux server version 5.x/6.x running on my HP micro server?

Upgrading Red Hat Enterprise Linux From Version 6.2 to 6.3

June 22, 2012June 22, 2012in CentOS, RedHat and Friends last updated June 22, 2012

Red Hat Enterprise Linux v6.3 has been released and available via RHN for immediate update. How do I upgrade my RHEL from 6.2 to the latest 6.3 version?

Could not chdir to home directory /root: No such file or directory Error and Solution

April 15, 2012October 25, 2012in Troubleshooting last updated October 25, 2012

When I ssh into my server and login as t root user and I’m getting the following error on screen:

Could not chdir to home directory /root: No such file or directory

How do I fix this error under CentOS or Debian Linux server?

Linux: NFS4 mount Error reason given by server: No such file or directory

September 6, 2011May 3, 2017in File system, Linux, Troubleshooting, UNIX last updated May 3, 2017

I recently installed NFS server v4 on my HP Linux server. However, I’m not able to mount it from Linux nfs4 client using the following command:

mount.nfs4 server2:/data /data

I’m getting the following error:

mount.nfs4: mounting server2:/data failed, reason given by server:
No such file or directory

How do I fix this problem?

JBD: Barrier-based Sync Failed On md0-8 – Disabling Barriers Error and Solution

September 4, 2011in Linux last updated September 4, 2011

I‘ve used the mdadm command line utility to setup and manage software RAID 6 under Debian Linux server. However, I get the following message in /var/log/messages file:
[ 14.003707] JBD: barrier-based sync failed on md0-8 – disabling barriers

How do I fix the message ‘JBD error message “barrier-based sync failed”‘?