How to install centos7 on virtual box

With the help of virtualbox & vmware its very easy to install 2 or more operating systems on the          same hardware. Today we are going to learn how to install centos7 on virtualbox. where i have           install virtual box on windows system. Link to how to install virtual box is here:

After installation of virtualbox if you open it. We will see below window. Then click on Add button.

After add you will see Create Virtual Machine image. where You can give name to your new OS. I have given here as Centos1. Type i have used as Linux with Red Hat(64 bit) OS. Then Please click on Next Button.

Now, you need to edit memory size for your system. I have set it as 2048 MB which is nothing but 2 GB. Then click on next button.

Then next window appears, where you have to select hard disk of 8 GB. Click on create a virtual disk now. Then click on create.

    Then select hard disk file type as VDI ( Virtual disk Image). Then click on next button.

Then Storage on physical hard disk select as dynamically allocated. Then click on next button. 

Now provide File location and size. I have given File location as C:\Users\Shree\Virtualbox VMs\Centos1.vdi . Next Assign memory as per requirement. Then, Click on create. 

 Now Virtually vm has created. Now Start the System by using start button.

   An iso image of os is nothing but the mirror image of operating system. Download Centos 7 64/32     bit OS as per the your system requirement. Then browse the downloaded iso image. Click on start       button. It will start the installation process.

    Select by using up arrow  Install Centos7. Click on it. Then installation begins.

 Do the country & language setting, as per your requirement.Then Continue.

Select hard disk & click on done button. Need to complete user & root creation with        password.Then actual installation will start. It will take approximately half an hour for complete  installation. When installation will finish. You will get below window. Then reboot your system by clicking reboot button.

    You can able to login to centos system by using root user & password. as below.

Now, You have successfully login to your newly installed centos7 OS. In the same way you can try another OS installation like fedora, ubuntu, kali linux, windows different versions, Redhat OS, etc.

Thank you very much for reading above article.

Configuration of Network- File-Sharing(NFS)

 Hello friends, today i am going to share you how to perform Network file sharing (NFS) on centos7 system. This configurations are mainly used for linux to linux machin files sharing.

File sharing steps are given below:

You will required 2 systems to perform the above mentioned configuration. If suppose, you have windows machine with you.Then by using virtualbox/vmware install centos7 or redhat7.Then consider one system of centos as a server & other as a client.

1)Install nfs package on server side by using command sudo yum install nfs*

install nfs package on client side by using command sudo yum install nfs-utils

2)Linux is very secure because it provides 3 layers of security like root,firewall,selinux.

Now disable selinux on both server & client side.

Steps to disabled selinux: Edit below mentioned configuration file.

i)vi /etc/selinux/config

 selinux=disabled

ii)reboot - then reboot the system.

iii) getenforce - check selinux is disabled or not by using getenforce command, output should be disabled.

3) STOP firewall as below:

Check the firewall status by using systemctl status firewalld command.

Stop the firewall by using systemctl stop firewalld.

4) Steps to perform server side:

i) Make new directory onto /mnt file as Mkdir /mnt/nfs1

change the directory by using command cd /mnt/nfs1

create empty files by using command touch 1 2 3 4 . This will create 1, 2, 3 & 4 empty files.

Edit file 1 as vi 1 and write the file like This is my nfs file.

5) Edit /etc/exports file as below:

i) vi /etc/exports then press enter write below content like

ii) /mnt/nfs1 * (rw,sync) where * indicates all ip addresses

iii) Change the permissions of /mnt/nfs1 file.

  chmod 777 /mnt/nfs1

6) Then, Start nfs service by using systemctl start nfs command.

7) Check the firewall status again, if firewalld is not stopped then stop it again by using systemctl stop firewalld

8) write exportfs-av command you will get output as below.

9) Check the ip address by using hostname –I

10) Steps to perform at client side:

i) mount 192.168.1.100:/mnt/nfs1 /mnt

11) Check the connectivity from client to server side by using ping command as ping 192.168.1.100

Where 192.168.1.100 is a server ip.

If ping is successful that means file sharing is successful.

12) at client side change directory to mnt by using cd /mnt, Then list the files associated with respective directory. You will get output as below.

Then Cat 1 you will get output as below.

If any error observer do the changes into network as bridge adapter on both system.

Thanks for reading above blog.