Tag: system

Howto Reboot or halt Linux system in emergency

Linux kernel includes magic system request keys. It was originally developed for kernel hackers. However, you can use this hack to reboot, shutdown or halt computer safely (remember safe reboot/shutdown == flush filesystem buffers and unmount file system and then reboot so that data loss can be avoided). This is […]

Five minutes to a secure Linux system

You must be thinking that I’m kidding. Nope I’m not. Let me explain. After installing Linux the first thing you should do is turn off all services and deny all incoming traffic till you configured the box securely. But why…? A default installation could run many nonessential services. These services […]

Solaris > Gathered System Information or How to print system configuration

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Howto: find the Linux kernel version?

The ‘uname’ command is use to determine certain system information in all the Linux/Unix flavours like CentOS, Ubuntu, Debian, Fedora, FreeBSD etc. With specific ‘uname’ options, you can display all the details of the current working kernel on the server. To display the working kernel name, version, date and time, […]

Get Hardware Information On Linux Using dmidecode Command

The tool dmidecode reads the system DMI table to display BIOS and hardware information of the server. Apart from getting current configuration of the system, you can also get information about maximum supported interface slots and memory capacity. dmidecodeis able to give information about the current RAM size on the […]

How to clear the cache from memory in Linux System

I am having 4 gb of ram in my production systems. and normally after 24 hours my nagios gives warning for insufficient memmory. when we check systems ,it always shows the memory in cache. So we normally reboot the system to clear the cache from the memory till we find […]

How do I Find Out Linux CPU Utilization?

Whenever a Linux system CPU is occupied by a process, it is unavailable for processing other requests. Rest of pending requests must wait till CPU is free. This becomes a bottleneck in the system. Following command will help you to identify CPU utilization, so that you can troubleshoot CPU related […]

HowTo: Increase /tmp partition size

How to increase /tmp partition? In case your server isn’t built with a /tmp partition OR you need to increase the disk space of the partition for some reason, you will have to create a virtual partition and have to mount it on /tmp. The following steps will guide you […]

FreeBSD >Sending a Message to All Users on a System

You can use the wall command to send a message to every user on a system. General syntax of wall command is as follows: wall Message Message … …. .. When the message is complete, press Control-D. 1) To display message “Disk failure system will be down for 30 minute” […]

hotplug a CPU on a running Red Hat system?

Problem You want to dynamically enable or disable a CPU on a running system. Solution Red Hat Enterprise Linux 5 supports the cpu-hotplug mechanism, which allows for CPUs to be dynamically disabled and re-enabled on a system without requiring a system reboot. Note: CPU hot-plugging will only work if physical […]