/var/log/messages HowTo - Linux / Unix Q & A from nixCraft

Linux Command To Find SATA Link Speed Such as 1.5 / 3.0 / 6.0 Gbps [ Hard Disk ]

September 4, 2012April 12, 2015in Hardware, Linux, Troubleshooting last updated April 12, 2015

How do I find out my SATA link speed? How do I make sure my sata hard disk is working at 6Gbps speed and how do I verify this on a Linux server running on HP or IBM amd64 hardware?

Linux: Neighbour Table Overflow Error and Solution

December 19, 2011in CentOS, Linux, Troubleshooting last updated December 19, 2011

I setup a CentOS Linux based Linux server running as a gateway and firewall server. However, I’m getting the following messages in the /var/log/messages log file:

Dec 20 00:41:01 fw01 kernel: Neighbour table overflow.
Dec 20 00:41:01 fw01 last message repeated 20 times

Dec 20 00:41:01 fw03 kernel: [ 8987.821184] Neighbour table overflow.
Dec 20 00:41:01 fw03 kernel: [ 8987.860465] printk: 100 messages suppressed.

Why does kernel throw “Neighbour table overflow” messages in syslog? How do I fix this problem under Debian / CentOS / RHEL / Fedora / Ubuntu Linux?

Ubuntu Linux Set Iscsi Initiator

July 2, 2010July 2, 2010in Ubuntu Linux last updated July 2, 2010

ISCSI is a network protocol standard that allows the use of the SCSI protocol over TCP/IP networks. How do I setup Iscsi Initiator under Ubuntu Linux? How do I format and connect to an iSCSI volume under Ubuntu Linux? How do I store VMware or Virtualbox virtual machine images using iscsi storage?

CentOS / Redhat Linux: Install Keepalived To Provide IP Failover For Web Cluster

February 21, 2010May 3, 2017in CentOS, High Availability, KeepAlived, Linux, Nginx, RedHat and Friends, UNIX last updated May 3, 2017

Keepalived provides a strong and robust health checking for LVS clusters. It implements a framework of health checking on multiple layers for server failover, and VRRPv2 stack to handle director failover. How do I install and configure Keepalived for reverse proxy server such as nginx or lighttpd?

BIND: Max open files (1024) is smaller than max sockets (4096) Error and Solution

May 1, 2009May 1, 2009in Bind dns, CentOS, Debian / Ubuntu, Networking, Package Management, RedHat and Friends, Troubleshooting last updated May 1, 2009

While going though my logs I found that BIND9 on Debian version 5.x is giving a warning which read as follows:

max open files (1024) is smaller than max sockets (4096)

How do I fix this problem?

BIND: Clocks are Unsynchronized Error and Solution

February 1, 2009in Bind dns, CentOS, Debian / Ubuntu, FreeBSD, HP-UX Unix, Linux, Networking, OpenBSD, Package Management, RedHat and Friends, Solaris-Unix, Suse, Troubleshooting, Ubuntu Linux, UNIX last updated February 1, 2009

Q. I’ve configured BIND named TSIG as documented here. It worked for some time, but my /var/log/messages got the errors as follows:

zone example.org/IN: refresh: failure trying master 71.22.11.22#53 (source 0.0.0.0#0): clocks are unsynchronized: 9 Time(s)
zone example.org/IN: refresh: failure trying master 71.22.11.22#53 (source 71.22.11.22#0): clocks are unsynchronized: 9 Time(s)

How do I fix these errors under Debian Linux 64 bit etch server?

Linux bnx2: eth1: No interrupt was generated using MSI, switching to INTx mode

August 4, 2008December 4, 2008in CentOS, Hardware, Linux, Networking, RedHat and Friends, Troubleshooting last updated December 4, 2008

Q. I see following message in my logs files:

Linux bnx2: eth1: No interrupt was generated using MSI, switching to INTx mode

My server hangs occasionally after rebooting with above message in /var/log/message. How do I get rid of this problem under CentOS Linux / RHEL version 4.x?