Bir Techs

Thursday, January 5, 2017

CentOS 7 Installation steps by steps

Installing steps on linux insert the media or attach the iso file.

Then run the setup next window will appear.

Select the options as per your need Install CentOS or Test the media.

After the welcome screen will come select your language.

Next , set the date , time and keyboard language. Then the installation media and software selection .

Generally we select server with GUI. You can select it your as per your environment

Also select the installation destination and set network & hostname.

Set System Hostname

Enable Ethernet Interface

Enter Network Settings

Click on Begin Installation

Select Root Password and give as per your eaisy.

Now, Select user creation create a local for linux.

CentOS 7 Installation Process start

CentOS 7 Installation Complete…

Enabling Auto Logins in CentOS 6

Head over to the trusty command line and edit /etc/gdm/custom.conf. The file already contains several sections, all of which are empty by default.

# GDM configuration storage

[daemon]

AutomaticLogin Enable = true

AutomaticLogin = admin

Disabling the Keyring Dialogue

you may experience a Keyring Dialogue which will ask for your root password every time after a restart. This isn’t much better than the login screen. This may or may not happen, depending on your current configuration:

One article I found suggested to head over to System – Preferences – Startup Applications and simply un-check from the list .

All we have to do is

– head over to the Network Connections Icon at the top of the screen
– and right-click it
– select Edit Connections…
– pick your current wireless connection and select Edit
– provide the root password (only necessary this once)
– check the tick box Available to all users

Wait! My system boots into the Command Line interface, even though I have GNOME installed. What gives?

You can tell your system in which mode to start. To do this, edit your /etc/inittab file:

// change this line id:3:initdefault: // to id:5:initdefault:

Configuring VNC Server on Linux

Install the VNC Server.

( Method – 1 )

For RHEL , CentOS ,OEL.

# yum install tigervnc-server

For Ubuntu.

# apt-get install tigervnc-server

Edit the “/etc/sysconfig/vncservers” file to configure the required displays.

The following entries enable VNC for display numbers “:2” and “:3”. Notice multiple “display:user” pairs are defined on a single line, but the arguments for each display are defined separately.

VNCSERVERS=”2:root 3:admin”

VNCSERVERARGS[2]=”-geometry 1280×1024 -nolisten tcp -localhost”
VNCSERVERARGS[3]=”-geometry 1280×1024″

Press Shift +C

:wq!

Set the VNC password for any users defined in the “/etc/sysconfig/vncservers” file.

# su admin

# vncpasswd
Password:
Verify:
Enable the “vncserver” service for autostart and start the service.

# chkconfig vncserver on
# service vncserver start

You should now be able to use a VNC viewer to connect to system using the display numbers and passwords defined.

Use the following commands to stop the service and disable autostart.

# service vncserver stop
# chkconfig vncserver off

(Method -2 )

Install the VNC Server.

# yum install tigervnc-server

Create a new configuration file for each of the display numbers you want to enable. In the following case, I am setting up the display number “:3”. Notice how the display number is included in the configuration file name.

# cp /lib/systemd/system/vncserver@.service /lib/systemd/system/vncserver@:3.service

Run the following command.

# systemctl daemon-reload

Set the VNC password for the user defined in the new configuration file.

# su – oracle

$ vncpasswd
Password:
Verify:
$ exit
Enable the service for autostart and start the service.

# systemctl enable vncserver@:3.service
# systemctl start vncserver@:3.service

You should now be able to use a VNC viewer to connect to system using the display number and password defined.

Use the following commands to stop the service and disable autostart.

# systemctl stop vncserver@:3.service

# systemctl disable vncserver@:3.service

Done. Thanks

Linux commands in brief

pstree Processes and parent-child relarionships

top Show top processes

ps -auxw process status

vmstat Monitor virtual memory

free Display amount of free and used memory

in the system. (Also: cat /proc/meminfo)

map Display/examine memory map and

libraries (so). Usage: pmap pid

cat /proc/sys/vm/freepages

Display virtual memory “free pages”.

One may increase/decrease this limit:

echo 300 400 500 > /proc/sys/vm/freepages

uname -a print system information

cat /proc/version Display Linux kernel version in use.

cat /etc/redhat-release Display Red Hat Linux Release.

(also /etc/issue)

uptime Tell how long the system has been

running. Also number of users and

system’s load average.

w Show who is logged on and what they are doing.

/sbin/lsmod List all currently loaded kernel modules. Same as cat /proc/modules

/sbin/runlevel Displays the system’s current runlevel .

hostname Displays/changes the system’s nodename . (Must also manually change

hostname setting in /etc/sysconfig/network . Command will change entry in /etc/hosts) service Display status of system services.

Example: service –status-all

Help: service –help

df -k report filesystem disk space usage.

(-k reports in Kbytes)

du -sh Calculates file space usage for a given

directory. (and everything under it) (-s option summarizes)

mount Displays all mounted devices, their

mountpoint, filesystem, and access. Used

with command line arguments to mount file system.

cat /proc/filesystems Display filesystems currently in use.

cat /proc/mounts Display mounted filesystems currently in use.

showmount Displays mount info for NFS filesystems.

cat /proc/swaps Displays swap partition(s) size, type and

quantity used.

cat /proc/ide/hda/anyfile

Displays disk information held by kernel.

who Displays currently logged in users.

Use who -uH for idle time and terminal info.

users Show all users logged in.

w Displays currently logged in users and processes they are running.

whoami Displays user id.

groups Display groups you are part of.

Use groups user-id to display groups for a given user.

set Display all environment variables in your current environment.

id Display user and all group ids. Use id user-id to display info for another user id.

last Show listing of last logged in users.

history Shell command to display previously entered commands

Installing SoapUI on Linux/Unix

Prerequisite

Make sure that you have Java (JRE) installed on your system

Installation

Download the Linux binary zip (no JRE) from http://www.soapui.org/
Unzip it into a preferable directory such as your home folder or /opt
Make sure that you have proper permissions on the unziped soapUI folder
Go into the folder and run $ bin/soapui.sh (open source) or $ bin/soapui-pro.sh (Pro)

32-bit systems

Once you’ve downloaded the installer the installation is pretty strait forward. Start it by just double-clicking on it. After preparing the installation which takes only a few seconds you’ll see the starting screen:

Just click Next to continue. You’ll be asked to accept our license agreement

After accepting and clicking Next you’ll be able to select the destination folder which by default is set to home/User/SmartBear/SoapUI-5.2.0 but can be changed.

Next step gives you an opportunity to optionally include, as additional components, SoapUI source files, Hermes installation and tutorials.

If you’ve chosen to install Hermes, next you’ll get the Hermes license agreement

If you have chosen to install tutorials, you will then be prompted to specify the tutorials location.

After that, specify the location where SoapUI will place symbolic links to.

After that, a window appears where you’ll be asked to select if a desktop icon should be created.

Finally, click Next to start the installation.

After a couple of minutes at most, the installation should be finished and you should see the next screen.

Now you are ready to use it. Good luck

Run System File Checker in Safe Mode, Boot Time or Offline on Windows 7 / 8

How to run System File Checker in Safe Mode, Offline or at Boot Time in Windows 8.1. This is useful if SFC will not run or start.

One of the useful tool Microsoft introduced on Windows, is the ability to run system file checker to check the stability of core system files.
One of the most effective ways to run this tool or SFC is to run in Safe Mode or at boot-time. This may be an option you may want to consider, if you find that your system file checker run does not complete successfully. At boot time, system files won’t be connected to any other Windows services so it could be easier for the to complete its run successfully and replace the files.

Run System File Checker in Safe Mode

Simply boot in Safe Mode, open an elevated command prompt, type sfc/scannow and hit Enter. System File Checker will run in Safe Mode too.

Run System File Checker at boot

On Windows XP we have a command called sfc /scanboot. It scans all protected system files every time the computer is booted. Running sfc /scanonce would run it once only at the next reboot. Unfortunately, these commands have been removed on later versions of Windows. So in order to run this command, we have to go to Windows RE and run it from here. We can also call it Run Offline System File Checker.

Run Offline System File Checker

To execute this run, do the following:

Insert the Windows installation disc or USB flash drive, or a system repair disc, and then shut down your computer. Then restart your Computer When prompted, press any key, and then follow the instructions that appear.

On the Install Windows page, or on the System Recovery Options page, choose your language and other preferences, and then click Next.

Click Repair your computer.

Select the Windows installation you want to repair, and then click next.

On the System Recovery Options menu

Click on Command prompt, then type in the following command and hit Enter:

sfc /scannow /offbootdir=d:\ /offwindir=d:\windows

Refer the second image above. I have used D, since the Windows drive is D.

Once it has completed the repair, type Exit and then reboot the system. In case the command does work or if the Windows failed to repair, then you need to run a Repair Windows 7 or Refresh Windows 8 to fix those corrupted files.

Cisco VPN installation on Window 10

First , Download these two setups links are

create a system restore Point

Dell Sonic Wall

http://www.firewall.cx/downloads/cisco-tools-a-applications/170-sonicwall-vpn-clent-1/file.html

Cisco VPN

http://www.firewall.cx/downloads/cisco-tools-a-applications/40-cisco-vpn-client-64bit-version/file.html

Install Dell Sonic Wall setup first. After Installation complete .

Install Cisco VPN setup .Once setup is complete .

Uninstall Dell Sonic setup and uncheck both the Delete preference options when ask and next & finish it.

Now you can import the VPN pcf files into Cisco VPN client .

How to remove Search Box/Bar above header/logo on Wordpress

To remove the search bar, you’ll need to remove it from header.php. Just go to Appearance → Editor → Header (header.php) and find this line:

 <div id="nav_search">
 <?php get_search_form(); ?> 
 </div>

<?php get_search_form(); ?>
</div>
</div>
<div class="clear"></div>
</div>
</header>
</div>

How to Upgrade PHP 5.3 to PHP 5.4 on CentOS 6.7

1. Confirm your version of PHP is the CentOS 6.7 default

Type in the following:

rpm -qa | grep php

Should output similar to the following:

php-cli-5.3.3-46.el6_6.x86_64

php-common-5.3.3-46.el6_6.x86_64
php-5.3.3-46.el6_6.x86_64

Great, let’s move on.

2. Install and activate the REMI and EPEL RPM Repositories

Type in the following to download and install the required files:

wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm && rpm -Uvh epel-release-latest-6.noarch.rpm

wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm && rpm -Uvh remi-release-6*.rpm

Now to enable the REMI repository globally:

nano /etc/yum.repos.d/remi.repo

Under the section that looks like [remi] make the following changes:

[remi]

name=Remi's RPM repository for Enterprise Linux 6 - $basearch
#baseurl=http://rpms.remirepo.net/enterprise/6/remi/$basearch/
mirrorlist=http://rpms.remirepo.net/enterprise/6/remi/mirror
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi

Press CTRL-O to save, and CTRL-X to exit, and we can continue.

3. Update PHP from 5.3 to 5.4

Easy as pie, simply type in the following:

yum -y update php*

Once that’s done, we can verify:

rpm -qa | grep php

And we should see something similar to the below:

php-common-5.4.45-1.el6.remi.x86_64

php-5.4.45-1.el6.remi.x86_64
php-cli-5.4.45-1.el6.remi.x86_64

Make sure PHP is working correctly:

php -v

You should see something similar to the following:

PHP 5.4.45 (cli) (built: Sep 2 2015 18:54:00)

Installing Apache ActiveMQ on Windows

Follow the instructions below to install Apache ActiveMQ on Windows.

Step 1. Download Apache ActiveMQ

1. Open a Web browser and access the following URL:

http://activemq.apache.org

2. Apache ActiveMQ home page opens. There is a link to the latest version on the homepage. Follow this link if the version is compatible with the WSO2 product you intend to use.

3. The link to the latest stable version is usually at the top of the page, separated from the general list. Follow the link.

4. Go to the "Getting the Binary Distributions" section of the page and follow the download link for Windows.

5. The link redirects to the page suggesting a mirror site for the download. Follow the link on the page.

6. The download dialog opens. Click "OK" to start the download.

Step 2. Extract The Archive

After the download is complete, extract files to a user-defined folder. For example, C:\WSO2\apache-activemq-5.5.0.

Step 3. Run Apache ActiveMQ

Follow the instructions below to run Apache ActiveMQ.

1. Open the Windows command prompt (CMD).

2. Use the following command to change the current directory to the ActiveMQ installation directory:

cd <activemq_install_dir>

where "<activemq_install_dir>" is the directory where ActiveMQ files were extracted to. For example,

3. Execute the following command to run ActiveMQ:

bin\activemq

4. Apache ActiveMQ will start running.The operation log will be displayed.