logs HowTo - Linux / Unix Q & A from nixCraft

HowTo: Merge Apache / Lighttpd / Nginx Server Log Files

last updated May 3, 2017 in Apache, CentOS, Debian / Ubuntu, FreeBSD, Linux, Nginx, Perl, UNIX

My ecommerce site runs using a cluster of Apache web server. The cluster is behind nginx load balancer. I want to merge backend Apache web server log files for statistics purpose. How do I mere web server log files under Linux / UNIX like operating systems using cron jobs?

Linux RAM Disk: Creating A Filesystem In RAM

last updated March 5, 2010 in File system, Linux

Software RAM disks use the normal RAM in main memory as if it were a partition on a hard drive rather than actually accessing the data bus normally used for secondary storage such as hard disk. How do I create and store a web cache on a RAM disk to improve the speed of loading pages under Linux operating systems?

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

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

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?

MySQL Bin Files Eating Lots of Disk Space

last updated December 18, 2008 in CentOS, Debian / Ubuntu, File system, Linux, MySQL, Storage, Ubuntu Linux, UNIX

Q. I get a large amount of bin files in the MySQL data directory called “server-bin.n” or mysql-bin.00000n, where n is a number that increments. What is MySQL Binary Log? How do I stop these files being created?

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

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

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?

Apache Log POST Data To A Log File

last updated April 17, 2008 in Apache, Debian / Ubuntu, Linux, Troubleshooting, UNIX

How do I log POST data submitted by our user registration form to a log file under Debian Linux Apache 2 Web Server?

Linux kernel: Uhhuh. NMI received for unknown reason 30

last updated January 16, 2009 in CentOS, Linux, RedHat and Friends, Troubleshooting

Q. I’ve upgrade my CentOS / RHEL (Red Hat Enterprise Linux) 4.7 on HP ProLiant DL580 G5 and it is showing unknown NMI errors in the logs:

Uhhuh. NMI received for unknown reason 30.
Dazed and confused, but trying to continue
Do you have a strange power saving mode enabled?

Uhhuh. NMI received for unknown reason 20.
Dazed and confused, but trying to continue
Do you have a strange power saving mode enabled?

How do I fix this error?