In this config you will learn how to block or redirect web traffic based on the visitor’s country geographical location using Apache’s geoip mod.
Assuming that you already have Apache webserver installed and running we start by the installation of mod_geoip:
UBUNTU/DEBIAN # apt-get install libapache2-mod-geoip CENTOS/REDHAT/FEDORA ( epel enabled only ) # yum install mod_geoip.x86_64
Below is a quick config on how to to encrypt and decrypt large files using OpenSSL and Linux such as Redhat, Ubuntu, Debian, CentOS, Fedora etc. First, what you will need is a some sort of arbitrary file. Let’s create 1GB file now:
$ fallocate -l 1G large_file.img $ ls -lh large_file.img -rw-r--r--. 1 lrendek lrendek 1.0G Jan 2 16:40 large_file.img
The nc ( netcat ) command can be used to transfer arbitrary data over the network. It represents a quick way for Linux administrators to transfer data without the need for an additional data transfer services such as FTP, HTTP, SCP etc. This config will show you an example on how to transfer data between to network hosts. We will be transferring data myfile.txt file from a localhost to a destination host with an IP address 10.1.1.2.
The nc command first needs to be started on the network host to which we need to transfer data. We will instruct nc to listen for an incoming request on user defined port number and once the client request comes receive the desired data. Pick the port number of your choice to ensure that it is not blocked by firewall and it is accessible from the source host.
$ nc -l -p 7555 > myfile.txt
The following linux commands will help you to obtain the information about your laptop battery such as manufacturer, part type, capacity, voltage etc. First, tool which can be used for this job is dmidecode command. If you currently do not have dmidecode available on your Linux system you can install it by:
UBUNTU/DEBIAN # apt-get install dmidecode CENTOS/FEDORA # yum install dmidecode
next, using dmidecode we can obtain some hardware information about our battery:
# dmidecode -t 22
# dmidecode 2.12
SMBIOS 2.6 present.
Handle 0x002E, DMI type 22, 26 bytes
Portable Battery
Location: Rear
Manufacturer: LGC
Name: 42T4942
Design Capacity: 93240 mWh
Design Voltage: 11100 mV
SBDS Version: 03.01
Maximum Error: Unknown
SBDS Serial Number: 073C
SBDS Manufacture Date: 2012-03-23
SBDS Chemistry: LION
OEM-specific Information: 0x00000000
Using an ENTRYPOINT Docker command specified within a Dockerfile one can pass an arguments to an interactive Docker container upon its launch. Consider a following Dockerfile content:
FROM debian:8 ENTRYPOINT ["echo"]
In this config you can learn how to convert documents format between LibreOffice and Microsoft Office file formats on Linux. The preferred tool to use for a file format conversion between LibreOffice and Microsoft Office is unoconv. Let’s start with the installation of unoconv package:
FEDORA/REDHAT/CENTOS # yum install unoconv DEBIAN/UBUNTU # apt-get install unoconv
and create some LibreOffice document document.odt and spreadsheet spreadsheet.ods to play with:
$ file document.odt document.odt: OpenDocument Text $ file spreadsheet.ods spreadsheet.ods: OpenDocument Spreadsheet
Questions:
How can I remove all docker containers based on a docker image name. I do not wish to remove all available containers, only the those which are based on particular image. For example I would like to remove all containers based on image centos:7.
Answer:
To remove all docker containers based on centos:7 run the following linux command:
# docker ps -a | awk '{ print $1,$2 }' | grep centos:7 | awk '{print $1 }' | xargs -I {} docker rm {}
Amazon currently accepts limited number of ebook formats that you can directly send to your Amazon Kindle. In this config we are going to show few Linux tools which may assist you with the conversion between various Document and eBook formats.
Based on your amazon Kindle type the supported formats may include:
The first tool you might consider is ebook-convert. This tool is available on Fedora , CentOS, Redhat Linux under the package named ebook-tools. To install ebook-tools package run the command below:
# yum install ebook-tools
This article will provide you with some hints on how to generate random password using shell. Among many other tools which can be used on the Linux command line to generate random passwords such as openssl, mktemp, od or /dev/urandom the specific and easiest tool designed for this purpose is pwgen.
DEBIAN/UBUNTU # apt-get install -y pwgen FEDORA # dnf install -y pwgen CENTOS # yum install -y pwgen
Let’s start by generating bunch of passwords by simple executing pwgen command. If no options are used pwgen will simply spit out 160 passwords with 8 characters each:
# pwgen AeD7Amiv Reech6ie dei7aiPe yoogh1Ch Quoh0zae shu2Eepa aoquu3Xa aiR4Raiv eeWah9Ro uPhe9pif uZiegh2h xie6Mail wa2xaHai saeLoh4O Yai8be7u aGhue7fe unieB3du yaiK7She ooh0ohGe Go5zuKai Aeseeph1 UJ3Moo5i xaeg6ohG aJ8oogah suFo3ohr jaTee0mi eeK9zuoh tho5xieP Ec6uob9j iyap1eNo at1Hahqu viebei2O zeeg9cuX iP9pooW6 ohS1nahl zaese9Vu dee1Tooh aS2Bahyu aeH5shoh hichooW6 Aishie2v phee8Ahp ce2Peith Ez0thoos oot0Aibo aizepe8J reeC6she aihaeSh6 EVaaroh1 apuviCh2 Ui2aec5t Yoh8jong eo2zaeWo queiTo7i aebai4Oe jahj5ieN Co5aije5 ooSh1oon taeJe5ae Kah3quie eeXae6Ma wu6ohp8U Eil4sha4 iiSohc4a eeNg0ied HaeH3ohl Shie9aih ohC5phoi boos6euG uadai3Oo Cohpai9I thuogh8E thie7Zai aem6sooN ieFu7uif tiewoh4U Kaes1bai Aox4zah0 OoH5utoh uo4aWied eew7baeV Iej7piel ohMa4iet Oi2aephi Yailov9t oaTheiz2 lexea9Ie iez0The2 et3Phaey hee2Oa7u Pee1Ibee ohbae1iZ thoo9eiZ eiCh3aiw Veiqu1ph quohF2oh xoh2Iwo3 aiQuai8i aeKae5Hi owaiz3Ve oJa2ret8 yie4baiK iex3Chug ruPie2ig Ahv7ciev kiemok7U veiX5cae thuL0Pho AiyeuB5t ooX4igeb bi0sohBu Ohl0hoaf Wooy1ja9 ue8ooj3B iik5yeP5 Ieboo1oi neeNiu7E aeV8aimu oojeiW6x Thoh6Eix zoaPh1au aiCh3eem quevoo8T Iey0soRo ceiC3Do4 Dae9ua4f pieyie2U noXu5ooK Zuexe5du oNeu8eef heu7iTah kahpa8Um thoSa7sh Lai4Keik oit7Dahc aiy5iaZo siv2Ut3a Tha8eePh eb6ieM2c DeVie1ee Cocofo7E Rihee6ya thi1Iigi iBi6quar Adeeh6Us Eicho5so siTho2Pu Dahcho5I kowe7Iev gee9IeNu Ohso2jae Aegha1oo Oomil4Ee Ahghoot3 Izai3oov yegeey6C ea8uG1ai Ahsh4Aeb quie5aeR paWaiqu4