http://www.cyberciti.biz/tips This is a Linux sys admin journal by Vivek about sys admin work, Linux tips & tricks, hacks, news and more. Wed, 24 Apr 2013 18:50:55 +0000 en-US hourly 1 http://wordpress.org/?v=3.5.1 http://www.cyberciti.biz/tips/php-security-best-practices-tutorial.html http://www.cyberciti.biz/tips/php-security-best-practices-tutorial.html#comments Wed, 23 Nov 2011 05:48:07 +0000 nixCraft http://www.cyberciti.biz/tips/?p=8173 PHP is an open-source server-side scripting language and it is a widely used. The Apache web server provides access to files and content via the HTTP OR HTTPS protocol. A misconfigured server-side scripting language can create all sorts of problems. So, PHP should be used with caution. Here are twenty-five php security best practices for sysadmins for configuring PHP securely.]]> http://www.cyberciti.biz/tips/php-security-best-practices-tutorial.html/feed 51 http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html#comments Sat, 27 Jun 2009 02:26:39 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4934 Need to monitor Linux server performance? Try these built-in command and a few add-on tools. Most Linux distributions are equipped with tons of monitoring. These tools provide metrics which can be used to get information about system activities. You can use these tools to find the possible causes of a performance problem. The commands discussed below are some of the most basic commands when it comes to system analysis and debugging server issues such as:

1. Finding out bottlenecks.
2. Disk (storage) bottlenecks.
3. CPU and memory bottlenecks.
4. Network bottlenecks.

]]> http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html/feed 316 http://www.cyberciti.biz/tips/linux-convert-ext3-to-ext4-file-system.html http://www.cyberciti.biz/tips/linux-convert-ext3-to-ext4-file-system.html#comments Fri, 23 Jan 2009 15:45:57 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4348 Some time ago ext4 was released and available for Linux kernel. ext4 provides some additional benefits and perforce over ext3 file system. You can easily convert ext3 to ext4 file system. The next release of Fedora, 11, will default to the ext4 file system unless serious regressions are seen. In this quick tutorial you will learn about converting ext3 to ext4 file system.]]> http://www.cyberciti.biz/tips/linux-convert-ext3-to-ext4-file-system.html/feed 19 http://www.cyberciti.biz/tips/freebsd-process-accounting-tutorial.html http://www.cyberciti.biz/tips/freebsd-process-accounting-tutorial.html#comments Thu, 08 Jan 2009 10:00:08 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4259 I've already written about Linux process accounting under Linux ( see how to keep a detailed audit trail of what's being done on your Linux systems). You can easily setup process accounting under FreeBSD. This tutorial expalins how to enable and utilizing FreeBSD process accounting including many other useful options are explained to keep track of system resources used, and their allocation among users.]]> http://www.cyberciti.biz/tips/freebsd-process-accounting-tutorial.html/feed 1 http://www.cyberciti.biz/tips/rhel-fedora-centos-apache2-external-php-spawn.html http://www.cyberciti.biz/tips/rhel-fedora-centos-apache2-external-php-spawn.html#comments Tue, 30 Dec 2008 12:49:34 +0000 nixCraft http://www.cyberciti.biz/tips/?p=4182 Now, mod_fastcgi is configured and running. FastCGI supports connection via UNIX sockets or TCP/IP networking. This is useful to spread load among various backends. For example, php will be severed from 192.168.1.10 and python / ruby on rails will be severed from 192.168.1.11. This is only possible with mod_fastcgi. ]]> http://www.cyberciti.biz/tips/rhel-fedora-centos-apache2-external-php-spawn.html/feed 8 http://www.cyberciti.biz/tips/linux-swap-space.html http://www.cyberciti.biz/tips/linux-swap-space.html#comments Wed, 19 Nov 2008 08:50:49 +0000 nixCraft http://www.cyberciti.biz/tips/?p=3586 Linux and other Unix-like operating systems use the term "swap" to describe both the act of moving memory pages between RAM and disk, and the region of a disk the pages are stored on. It is common to use a whole partition of a hard disk for swapping. However, with the 2.6 Linux kernel, swap files are just as fast as swap partitions. Now, many admins (both Windows and Linux/UNIX) follow an old rule of thumb that your swap partition should be twice the size of your main system RAM. Let us say I've 32GB RAM, should I set swap space to 64 GB? Is 64 GB of swap space really required? How big should your Linux / UNIX swap space be? ]]> http://www.cyberciti.biz/tips/linux-swap-space.html/feed 64 http://www.cyberciti.biz/tips/centos-rhel-poor-nfs-write-performance.html http://www.cyberciti.biz/tips/centos-rhel-poor-nfs-write-performance.html#comments Fri, 22 Aug 2008 09:41:58 +0000 nixCraft http://www.cyberciti.biz/tips/?p=2759 A few days ago I noticed that NFS performance between a web server node and NFS server went down by 50%. NFS was optimized and the only thing was updated Red Hat kernel v5.2. I also noticed same trend on CentOS 5.2 64 bit edition.]]> http://www.cyberciti.biz/tips/centos-rhel-poor-nfs-write-performance.html/feed 4 http://www.cyberciti.biz/tips/lighttpd-drupal-htacess-seo-clean-urls.html http://www.cyberciti.biz/tips/lighttpd-drupal-htacess-seo-clean-urls.html#comments Wed, 30 Jul 2008 13:54:06 +0000 nixCraft http://www.cyberciti.biz/tips/?p=2544 Drupal is modular framework and content management system (CMS) and works under Lighttpd too. By default, Drupal passes path arguments to itself via its internally generated URLs. This small howto explains setting up clean url using Lighttpd web sever.]]> http://www.cyberciti.biz/tips/lighttpd-drupal-htacess-seo-clean-urls.html/feed 4 http://www.cyberciti.biz/tips/linux-assign-static-names-to-scsi-devices.html http://www.cyberciti.biz/tips/linux-assign-static-names-to-scsi-devices.html#comments Fri, 20 Jun 2008 14:48:11 +0000 nixCraft http://www.cyberciti.biz/tips/?p=2396 http://www.cyberciti.biz/tips/linux-assign-static-names-to-scsi-devices.html/feed 1 http://www.cyberciti.biz/tips/lighttpd-mod_rewrite-redirect-hotlink-image.html http://www.cyberciti.biz/tips/lighttpd-mod_rewrite-redirect-hotlink-image.html#comments Thu, 12 Jun 2008 12:19:33 +0000 nixCraft http://www.cyberciti.biz/tips/?p=2363 http://www.cyberciti.biz/tips/lighttpd-mod_rewrite-redirect-hotlink-image.html/feed 3 http://www.cyberciti.biz/tips/linux-set-io-scheduling-class-priority.html http://www.cyberciti.biz/tips/linux-set-io-scheduling-class-priority.html#comments Tue, 03 Jun 2008 13:13:44 +0000 nixCraft http://www.cyberciti.biz/tips/?p=2339 Describes how to deal with high disk I/O generating scripts or programs using ionice and CFQ scheduling class under Linux.]]> http://www.cyberciti.biz/tips/linux-set-io-scheduling-class-priority.html/feed 11 http://www.cyberciti.biz/tips/rt-enterprise-grade-ticketing-system.html http://www.cyberciti.biz/tips/rt-enterprise-grade-ticketing-system.html#comments Fri, 25 Apr 2008 18:15:42 +0000 nixCraft http://www.cyberciti.biz/tips/?p=2238 http://www.cyberciti.biz/tips/rt-enterprise-grade-ticketing-system.html/feed 0 http://www.cyberciti.biz/tips/tool-to-monitor-linux-system-call-latencies.html http://www.cyberciti.biz/tips/tool-to-monitor-linux-system-call-latencies.html#comments Sat, 19 Jan 2008 08:51:02 +0000 nixCraft http://www.cyberciti.biz/tips/tool-to-monitor-linux-system-call-latencies.html http://www.cyberciti.biz/tips/tool-to-monitor-linux-system-call-latencies.html/feed 0 http://www.cyberciti.biz/tips/linux-unix-configuration-for-rssh.html http://www.cyberciti.biz/tips/linux-unix-configuration-for-rssh.html#comments Sat, 22 Dec 2007 00:00:00 +0000 nixCraft http://www.cyberciti.biz/tips/linux-unix-configuration-for-rssh.html http://www.cyberciti.biz/tips/linux-unix-configuration-for-rssh.html/feed 6 http://www.cyberciti.biz/tips/linux-unix-sets-the-page-size-to-size.html http://www.cyberciti.biz/tips/linux-unix-sets-the-page-size-to-size.html#comments Fri, 21 Dec 2007 11:18:43 +0000 nixCraft http://www.cyberciti.biz/tips/linux-unix-sets-the-page-size-to-size.html http://www.cyberciti.biz/tips/linux-unix-sets-the-page-size-to-size.html/feed 2 http://www.cyberciti.biz/tips/linux-disk-performance-monitoring-howto.html http://www.cyberciti.biz/tips/linux-disk-performance-monitoring-howto.html#comments Mon, 17 Dec 2007 14:24:49 +0000 nixCraft http://www.cyberciti.biz/tips/linux-disk-performance-monitoring-howto.html http://www.cyberciti.biz/tips/linux-disk-performance-monitoring-howto.html/feed 17 http://www.cyberciti.biz/tips/rhel-linux-optimize-3ware-raid-read-performance.html http://www.cyberciti.biz/tips/rhel-linux-optimize-3ware-raid-read-performance.html#comments Thu, 22 Nov 2007 05:17:59 +0000 nixCraft http://www.cyberciti.biz/tips/rhel-linux-optimize-3ware-raid-read-performance.html http://www.cyberciti.biz/tips/rhel-linux-optimize-3ware-raid-read-performance.html/feed 5 http://www.cyberciti.biz/tips/reboot-linux-box-after-a-kernel-panic.html http://www.cyberciti.biz/tips/reboot-linux-box-after-a-kernel-panic.html#comments Fri, 16 Nov 2007 07:18:41 +0000 nixCraft http://www.cyberciti.biz/tips/reboot-linux-box-after-a-kernel-panic.html http://www.cyberciti.biz/tips/reboot-linux-box-after-a-kernel-panic.html/feed 3 http://www.cyberciti.biz/tips/howto-linux-iptables-block-p2p-traffic.html http://www.cyberciti.biz/tips/howto-linux-iptables-block-p2p-traffic.html#comments Thu, 15 Nov 2007 01:17:29 +0000 nixCraft http://www.cyberciti.biz/tips/howto-linux-iptables-block-p2p-traffic.html http://www.cyberciti.biz/tips/howto-linux-iptables-block-p2p-traffic.html/feed 3 http://www.cyberciti.biz/tips/howto-linux-increase-pid-limits.html http://www.cyberciti.biz/tips/howto-linux-increase-pid-limits.html#comments Sat, 03 Nov 2007 02:13:09 +0000 nixCraft http://www.cyberciti.biz/tips/howto-linux-increase-pid-limits.html http://www.cyberciti.biz/tips/howto-linux-increase-pid-limits.html/feed 0