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+ Add to Google NewsHow to synchronize data between two servers using rsync
Rsync: rsync is an application used in unix systems which synchronize files and directories between two machines.rsync behaves like rcp(remote file copy),but it much faster than rcp.because rsync sends the differences in the files instead of sending entire files.
10 ways to make Linux boot faster
Linux rarely needs to be rebooted. But when it does, it’s often slow to boot. Fortunately, there are ways to speed things up. Some of these methods are not terribly difficult (although some, unfortunately, are). Let’s take a look. 1: Disable unnecessary...
RAID - Redundant array of independent disks
RAID is an acronym for Redundant Array of Independent Disks. With RAID enabled on a storage system you can connect two or more drives in the system so that they act like one big fast drive or set them up so that one drive in the system is used to automatically and instantaneously duplicate (or mirror)...
IPtables - Basic concepts
The IPTables program that comes with Linux distributions allows administrators to configure the operating system so that it allows applications and clients to connect through the network and stop unwanted applications and clients from communicating and corrupting the operating system. It is really a...
How to record a UNIX terminal session
Start the recording of Unix terminal session with script command. And start doing your important configurations, it will recorded in a file.
After completing the task ,you can exit the recording with exit command
Example procedure:
Securing Your Network by Filtering MAC Addresses
If you live in the middle of nowhere you probably wonder why you should secure the access to your network. If you’re setting up a company network however, this probably seems obvious to you: you don’t want unwanted access to the network. Even at home, with wireless...
Xenserver stuck VM / VDI is not available / Master switch
Please only execute these commands if ur comfy with ssh and xenserver, if u dont know what ur doing u can get urself in alot of trouble by killing the wrong vm’s etc.
Sever Administration - mail troubleshooting
Go through this post to troubleshoot mail issues on your server.. Check emails in mail queue root@server [~]# exim -bp Count number of emails in mail queue root@server [~]# exim -bpc ...
No volume control GStreamer ... found — no sound on Ubuntu
I was introduced to Linux via RedHat distributions, such Fedora or CentOS. With Fedora you tend to learn a lot because so many things are broken! I also used Novell’s openSuSE for a while. I found it to be much more polished than Fedora. SuSE includes Yast...
Network config files in Linux
In most cases, the DNS configuration is stored within /etc/resolv.conf. To add a DNS server, you can simply add a line “namespace 123.123.123.123? in /etc/resolv.conf (assuming you want to use 123.123.123.123 as your DNS Server): nameserver 123.123.123.123 However,...
9 Server Configuration checking useful commands
Server Configuration checking commands: 1.HTTP Webserver: httpd -t Run syntax tests for configuration files only. The program immediately exits after these syntax parsing tests with either a return...
Connection reset by peer — ssh sshfs error
Recently, after re-installation of Ubuntu Linux, sshfs mount, from a Fedora Core, has failed with the following error message, read: Connection reset by peer. In fact this error is not due to sshfs but its ssh subsystem. Unlike ssh, sshfs does not give a very...
Basic commands a system admin need to know
Basic commands a system admin need to know. - tty – tty command will tells you current terminal. #tty /dev/pts/1 - whoami- whoami commands tells you current logged-in username #whoami ...
How To Perform HTTP-GET via Curl Commands inside PHP
PHP supports libcurl that allows you to connect and communicate to many different types of servers with many different types of protocols. libcurl currently supports the http, https, ftp, gopher, telnet, dict, file, and ldap protocols. libcurl also supports HTTPS...
important uses of LSOF Command for Linux admin
Important uses of LSOF Command - lsof is a Linux utility which lists the information about files opened by processes.LSOF is one of the powerful tool available for troubleshooting problems. Below listed important uses of LSOF Command Listing Files Open...
Xenserver stuck VM / VDI is not available / Master switch
Please only execute these commands if ur comfy with ssh and xenserver, if u dont know what ur doing u can get urself in alot of trouble by killing the wrong vm’s etc. Dont blame me if u seriously break something :). Stuck...
... xcb_xlib_unlock: Assertion ... failed — Matlab JVM error
Few days back I have installed Red Hat Fedora . I have put Matlab on there as well. When I tried to start Matlab using this command: matlab -nodesktop -nosplash # ©2021 gnulinux.ro the following error occurred. MATLAB:...
lsof | grep snd — how to free a Linux sound device
A program attempting to open a sound device for exclusive access may fail, if that audio device is already in use by another program. Also, depending on the capabilities of the audio device, such as whether it is full-duplex or not, errors may occur if capture is requested...
aspell — spelling with foreign dictionaries
Regardless of whether you are a spelling genius or a spelling disaster, like myself, it is useful to have a spellchecker handy. There are number of tools available for this purpose. For single words, Google is quite useful. There are many other websites with...
lprm — cancel print jobs
lprm is a useful tool for removal of active or queued print jobs. Lets start by having a look at line printer queue status using lpq utility. Simply type lpq at the shell to produce a list of active and queued jobs for your default printer. printer is ready and printing Rank Owner Job ...
cat /etc/*-release — finding out Linux release version
If you have a lot of different Linux distributions installed on many different machines it is easy to forget what distribution version runs on which PC. Well worry not! It is easy enough to findout. On Novell’s Open SuSE Linux, the distribution release information is...
tar — how to create and extract tar.gz and tar.bz2 archives
The commonly employed archive types on Linux and Unix systems are tar, tar.gz and tar.bz2 archives. Note that tar.gz and tar.bz2 archives are simply gzip-ped and bzip(2)-ped tar archives, respectively. Working with these files is made very simple through the use of GNU...
mmv — move multiple files by wildcard patterns
If you ever have to rename or move multiple files under Linux, then the mmv©2007 dsplabs.com.au shell command will make your life easy. The mmv utility will also come in handy for copying multiple files, appending content of one file to other files, as well as for creation of...
cups — fixing cups printer problem: lpd failed
Recently, our HP2420dn printer stopped working. Well, it was not really the printer… printing jobs went but nothing came out of the printer. The cups server has put the printer into a stopped state with the StateMessage /usr/lib/cups/backend/lpd failed. ...
growisofs — burning iso files to dvd using growisofs
It is very simple to burn ISO files to DVDs using growisofs under Linux. For example, to burn file.iso to /dev/dvd DVDR(W) device the following command can be used from bash. growisofs -dvd-compat -Z /dev/dvd=file.iso # ©2007...