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I was preparing Lenovo G400 laptop for my linux class, after I installed CentOS 6.5 on it, tada,,,, my ethernet adapter won't show up. I checked with ifconfig command but where the hell my eth0 ??. Then i type the command below : # lspci -v 01:00.0 Ethernet controller: Qualcomm Atheros AR8162 Fast Ethernet (rev 10)     Subsystem: Lenovo Device 3802     Flags: bus master, fast devsel, latency 0, IRQ 32     Memory at 90500000 (64-bit, non-prefetchable) [size=256K]     I/O ports at 2000 [size=128]     Capabilities: <access denied>     Kernel driver in use: alx It seem my wired network adapter do not have its driver. After searching on the net then I find this great article. I wrote it out on my blog to make it sure I have notes for the trouble. This is how we troubleshoot it :   First download this file : alx-linux-v2.0.0.6.rar unrar it, run make command, change directory...

Menyandingkan Windows 7 dan CentOS 7 dalam satu perangkat (komputer) yang sama ternyata tidak mudah, walaupun kedua OS tersebut sama-sama memiliki angka 7 di belakangnya :) Bila pada komputer kita sudah terinstal sistem operasi Windows dan berencana akan menginstal CentOS 7 sebagai sistem operasi yang kedua, ternyata caranya agak berbeda dengan tahapan instalasi dual-booting bila menggunakan CentOS 6. Bagi yang pernah mencoba untuk melakukannya mungkin kita mendapatkan setelah prosedur instalasi selesai ternyata pada menu GRUB2 kita tidak mendapatkan pilihan menu untuk masuk ke sistem operasi Windows kita. Hal tersebut ternyata akibat dari CentOS 7 belum bisa membaca partisi NTFS milik sistem operasi Windows, yang mengakibatkan menu GRUB2 tidak langsung menambahkannya di dalam menu booting komputer kita pada saat proses instalasi CentOS 7. Untuk memunculkan menu sistem operasi WIndows 7 di dalam menu GRUB2 berikut langkah-langkahnya : Lakukan instalasi paket yang ber...

Beberapa waktu lalu, baru saja selesai melaksanakan Uji Kompetensi Keahlian untuk Sekolah Menengah Kejuruan Teknik Komputer dan Jaringan. Kebetulan dari institusi tempat penulis bernaung, penulis masih dipercaya untuk menjadi Penguji Eksternal ( External Assesor ). Masih sama dengan pelaksanaan beberapa tahun yang lalu, pelaksanaan UKK ini merupakan bentuk kerjasama akademik yang dilakukan dengan sekolah-sekolah kejuruan yang berada di bawah Yayasan Abdi Karya Jakarta. Pada tahun akademik 2014/2015 ini siswa uji berasal dari sekolah-sekolah yang berada di Kabupaten Subang, Kota Bekasi dan Kabupaten Bogor . Berikut beberapa dokumentasi pelaksanaan uji kompetensi tersebut :   

  Check your Network Interface Card cat /sys/class/net/eth0/carrier or, cat /sys/class/net/eth0/operstate if the result is 0 or down , it means your NIC to cable is not connected . if the result is 1 or up , it means your NIC to cable is connected .    

Awal tahun 2015 ini kegiatan pengajaran dibuka dengan dilaksanakannya kelas industri di salah satu sekolah kejuruan yang terletak di kabupaten Bandung, yaitu SMK Yadika Soreang. Program yang diadakan sebagai kerjasama antara PT. Belogix Indonesia dengan Yayasan Abdi Karya ini merupakan suatu kalendar akademik yang telah rutin dilaksanakan di seluruh sekolah kejuruan yang berada di bawah naungan yayasan tersebut. Program ini merupakan bentuk kepedulian PT. Belogix Indonesia untuk lebih meningkatkan sumber daya manusia Indonesia dalam bidang teknologi informasi, yang dimulai dari sekolah kejuruan, agar menghasilkan lulusan-lulusan siap kerja yang mampu bersaing dan memiliki bekal yang tepat guna dalam menghadapi persaingan di dunia kerja yang sangat ketat. Informasi lebih detil tentang program kelas industri yang dimiliki oleh Belogix dapat dilihat pada tautan berikut ini : http://belogix.com/academic-alliance/ SMK Yadika Soreang sebagai sekolah kejuruan swasta yang cukup repre...

IP Masquerade is a networking function in Linux similar to the one-to-many (1:Many) NAT (Network Address Translation) servers found in many commercial firewalls and network routers. For example, if a Linux host is connected to the Internet via PPP, Ethernet, etc., the IP Masquerade feature allows other "internal" computers connected to this Linux box (via PPP, Ethernet, etc.) to also reach the Internet as well. Linux IP Masquerading allows for this functionality even though these internal machines don't have an officially assigned IP address . MASQ allows a set of machines to invisibly access the Internet via the MASQ gateway. To other machines on the Internet, the outgoing traffic will appear to be from the IP MASQ Linux server itself. In addition to the added functionality, IP Masquerade provides the foundation to create a HEAVILY secured networking environment. With a well built firewall, breaking the security of a well configured masquerading sys...

this is tutorial to install nvidia display driver on enterprise linux *all of the command must be executed as root user  1. check the nvidia product type lspci -nn | grep VGA here you will have the infomation what proprietary driver you should download from www.nvidia.com site. 2. install the Development Tools group packages, kernel headers, kernel devel, and dkms yum groupinstall "Development Tools" yum install dkms kerne-devel kernel-headers 3. disable the nouveau driver using your text editor vim /etc/modprobe.d/blacklist.conf #add this line blacklist nouveau 4. go to /boot directory make a copy of initramfs file cd /boot mv initramfs-$(uname -r).img initramfs-$(uname -r).img.bak 5. proceed to create new initramfs file dracut -v initramfs-$(uname -r).img $(uname -r) 6. change inittab to start the system with no X11 vim /etc/inittab change runlevel to 3 7. restart the system reboot 8. login in command line as root, run the script to install t...

in our tour of duty, we are facing another case where the ethernet device on motherboard didn't recognize by linux kernel. here are the specification : motherboard  : GIGABYTE G41MT-S2PT linux operating system :   Scientific Linux 6.0 another enterprise-based linux (centos, oracle linux) will works (i hope). we have try with fedora 14 , but it didn't recognize the device and the driver is not available yet. fortunate we have found the driver in binary (RPM package). first download the package file from the following links : i386 driver : kmod-atl1e-1.0.1.14-1.el6.elrepo.i686.rpm x86_64 driver : kmod-atl1e-1.0.1.14-1.el6.elrepo.x86_64.rpm step 1 install the package by typing  (as root) rpm -ivh kmod-atl1e... .rpm step 2 change directory to /etc/sysconfig/, please check whether there is a file called network, if there isn't create new file with your favourite text editor. cd /etc/sysconfig/ vim network the content of network file : NETWORKING=...

systemd does not use /etc/inittab file to change the default runlevel. systemd uses symlinks to point to the default runlevel. You have to delete the existing symlink first before creating a new one. # rm /etc/systemd/system/default.target example to switch to runlevel 3 : # ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target next example if you want to switch to run level 5 : # ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target another options that may apply : poweroff.target --> runlevel 0 rescue.target    --> runlevel 1 multi.user.target --> runlevel 2,3,4 graphical.target --> runlevel 5 reboot.target --> runlevel 6 source: http://fedoraproject.org/wiki/Systemd

basic usage to access the remote server $ rdesktop (serveraddr) example to access the computer on 192.168.1.1 $ rdesktop 192.168.1.1 to enable full screen mode $ rdesktop -f 192.168.1.1 to set spesific windows size $ rdesktop -g 800x600 192.168.1.1 (some common screen resolution can be use: 800x600, 1024x768, 1280x1024) sharing files to share a local directory with windows os remote server $ rdesktop -r disk:(sharename)=(path) (serveraddr) example to access the remote server on 192.168.1.1 and the sharing directory /home/vadya/pub/ using network share name "sharing" $ rdesktop -r disk:sharing=/home/vadya/pub 192.168.1.1 optimizing speed enabling compression (-z) and disabling mouse events (-m) will reduce network bandwidth and can make the connection much more responsive.  $ rdesktop -z -m 192.168.1.1 using a smaller color palette helps reduce network bandwidth $ rdesktop -a 16 192.168.1.1 source: http://wiki.rrc.uic.edu/wiki/RRC-SCS:_Using_rd...

Openfire is a powerful instant messaging (IM) and chat server that implements the XMPP protocol. This document will guide you through installing Openfire. For a full list of features and more information, please visit the Openfire website: http://www.igniterealtime.org/projects/openfire/ A. INSTALLATIONS first download the binary package from : http://www.igniterealtime.org/openfire-3.8.1-1.i386.rpm then r un it using your package manager to install Openfire to /opt/openfire (as root): rpm -ivh openfire_3_0_0.rpm Note: if you are using the .tar.gz build, it does not contain a bundled Java runtime (JRE). Therefore, you must have JDK or JRE 1.5.0 (Java 5) or later installed on your system. You can check your java version by typing "java -version" at the command line and (if necessary) upgrade your Java installation by visiting http://java.sun.com. B. SETUP the database In the Openfire setup tool, use the following values: driver: com.mysql.jdbc...

here are examples of the systemctl version of a few common chkconfig and service commands. 1. to list processes # chkconfig --list # systemctl list-units 2. to enable a service # chkconfig (servicename) on # systemctl enable (servicename).service 3. to disable a service # chkconfig (servicename) off # systemctl disable(servicename).service 4. to start a service # service (servicename) start # systemctl start (servicename).service 5. to stop a service # service (servicename) stop # systemctl stop (servicename).service 6. to see the status of a service # service (servicename) status # systemctl status (servicename).service or # systemctl is-active (servicename).service source: http://fedoraproject.org/wiki/SysVinit_to_Systemd_Cheatsheet

create VMs in guest headless mode guest headless is a term to create virtual guest by using the linux terminal (CLI). the computer server facilitates installation through command lines, and guest installation process will be done by remote application (ssh). here are the steps how to create fedora 18 (for example) virtual machine using image file (iso).  1. creating guest name $ VBoxManage createvm --name "fedora 18" --register 2. allocating amounts of RAM and networking type $ VBoxManage modifyvm "fedora 18" --ostype fedora --memory 1024 --acpi on --pae on --boot1 dvd --nic1 bridged --bridgeadapter1 eth0 3. create amount of hard disk capacity $ VBoxManage createhd --filename fedora18.vdi --size 10000 4. selecting hard disk device type $ VBoxManage storagectl "fedora18" --name "IDE Controller" --add ide 5. connecting fedora18.vdi file to hard disk device type $ VBoxManage storageattach "fedora 18" --storagectl ...

Network Address Translation Network Address Translation (NAT) is the process where a network device, usually a firewall, assigns a public address to a computer (or group of computers) inside a private network. The main use of NAT is to limit the number of public IP addresses an organization or company must use, for both economy and security purposes. The most common form of network translation involves a large private network using addresses in a private range (10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, or 192.168.0 0 to 192.168.255.255). The private addressing scheme works well for computers that only have to access resources inside the network, like workstations needing access to file servers and printers. Routers inside the private network can route traffic between private addresses with no trouble. However, to access resources outside the network, like the Internet, these computers have to have a public address in order for responses to their requ...

March 12th 2013 The CentOS team is pleased to announce the immediate availability of CentOS 6.4 for i386 and x86_64 architectures. CentOS 6.4 is based on the upstream release EL 6.4 and includes packages from all variants. All upstream repositories have been combined into one, to make it easier for end users to work with. There are some very important changes to this release compared with the previous versions of CentOS and we highly recommend reading this announcement along with the Release Notes . Especially take a look at the "Known Issues" section. There is also a minimal install CD that will get you a very small base install that you can add to. Download link: i386 | x86_64

this is tutorial how to install desktop environment on base server configuration installation of enterprise linux installation desktop environment (gnome) install several group packages below : # yum groupinstall “Base” # yum groupinstall “X Window System” # yum groupinstall “Desktop” # yum groupinstall “General Purpose Desktop” to install web browser application (mozilla firefox)  : # yum groupinstall “Internet Browser” to install office and mail client applications (openoffice.org, evolution)  : # yum groupinstall “Office Suite and Productivity” notes : *enterprise linux distribution on the example is Oracle Linux Server 6.0. *group package 'Office Suite and Productivity' is not available on DVD repository OLS 6.0.  *for fedora install group package “X Window System” and “GNOME Desktop Environment” only.

on several gigabyte motherboard, onboard network interface card  will not be detected on enterprise linux distribution (e.g. scientific linux, oracle linux server, etc). alternatively you must supply add-on card. or if you insist to use the onboard card, you must install the unofficial nic driver. this is tutorial how to install driver for onboard network interface card GIGABYTE first of all prepare your system. make sure it has package group "Development Tools" installed. if it has not, install it # yum groupinstall “Development Tools” download the source code : https://www.dropbox.com/s/na91bu4az4p9827/AR81Family-linux-v1.0.1.14.tar.gz extract the source code : # tar zxvf AR81Family-linux1.0.1.14.tar.gz the extraction process will make the new directory "AR81Family*", change to the directory # cd AR81Family* compile the source by type on terminal : # make then, # make install wait until the compiling process finish. next make the new scrip...