Linux Tips, Hacks, Tricks, and Tutorials
Finding the New Hard Drive in CentOS # ls /dev/sd* /dev/sda /dev/sda1 /dev/sda2 /dev/sdb Creating Linux Partitions # su – # fdisk /dev/sdb Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0xd1082b01. Changes will remain in memory only, until you decide […]
MySQL Cluster is designed to provide a MySQL compatible database with high availability and low latency. The MySQL Cluster technology is implemented through the NDB (Network DataBase) and NDBCLUSTER storage engines and provides shared-nothing clustering and auto-sharding for MySQL database systems. In the shared-nothing architecture, each of nodes has its own memory and disk, the […]
Step 1 – Enabling the kernel module This is a simple step – all you need to do is run the following command as the root user: modprobe fuse Step 2 – Installing Fuse/SSHFS yum install fuse-sshfs sshfs Step 3 – Using SSHFS The commands to use SSHFS are fairly simple. To mount a remote […]
To install, first you must add the Webtatic EL yum repository information corresponding to your CentOS/RHEL version to yum: CentOS/RHEL 7.x: rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm CentOS/RHEL 6.x: rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm rpm -Uvh https://mirror.webtatic.com/yum/el6/latest.rpm Remove old php version yum remove php* Now you can install PHP 5.6’s mod_php SAPI (along with an opcode cache) […]
Installing Gnokii Requirements – intltool-0.35.0-2.i386.rpm tar -xzvf gnokii-0.6.28.tar.gz cd gnokii-0.6.28 ./configure make make install cp -Rdp /usr/share/doc/gnokii/sample/gnokiirc /root/.gnokiirc or cp -Rdp /usr/share/doc/gnokii/sample/gnokiirc /etc/gnokiirc configure Gnokii for Wavecom GSM modem #vim /root/.gnokiirc [global] port = /dev/ttyS0 model = AT initlength = default connection = serial use_locking = no serial_baudrate = 9600 smsc_timeout = 10 [xgnokii] allow_breakage […]
Nagios is an awesome Open Source monitoring tool, its provides you more comprehensive monitoring environment to always keep an eye on your all machines / networks whether you are in a your data center or just your small labs. With Nagios, you can monitor your remote hosts and their services remotely on a single window. […]
Users who have been using Linux for awhile often learn that creating a basic script is a good way to run multiple, often-repeated commands. Adding a little color to scripts can additionally provide nice feedback. This can be done in a fairly straight-forward way by using the tput command. A common way of doing this […]
AWK is an interpreted programming language. It is very powerful and specially designed for text processing. AWK – Basic Examples This chapter describes several useful AWK commands and their appropriate examples. Consider a text file marks.txt to be processed with the following content − 1) Amit Physics 80 2) Rahul Maths 90 3) Shyam Biology […]
The sar command collect, report, or save UNIX / Linux system activity information. It will save selected counters in the operating system to the /var/log/sa/sadd file. Fromlinux-logo the collected data, you get lots of information about your server: CPU utilization Memory paging and its utilization Network I/O, and transfer statistics Process creation activity All block […]
1. Add ‘send snmp trap’ command to nagios vim /usr/local/nagios/etc/objects/commands.cfg define command{ command_name send_snmptrap command_line /usr/bin/snmptrap -v 2c -c public 10.50.24.34 ” NAGIOS-NOTIFY-MIB::nSvcEvent nSvcHostname s “$HOSTNAME$” nSvcDesc s “$SERVICEDESC$” nSvcStateID i $SERVICESTATEID$ nSvcOutput s “$SERVICEOUTPUT$” } 2. Add this event and enable the event to services which needed to send traps vim /usr/local/nagios/etc/objects/localhost.cfg define service{ […]