10 Best Linux Server Distributions of 2017

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How to Remove Packstack Answer File


Watch :- How to Install of OpenStack Using RDO in CentOS 7 Step by Step Procedure
https://itcloudnet.blogspot.in/2017/05/how-to-install-of-openstack-in-centos-7.html

Watch :- How to Install Openstack Using Devstack in All-In-One Single Machine on CentOS 7
https://itcloudnet.blogspot.in/2017/05/how-to-install-openstack-using-devstack.html

Watch :- Interview Questions and Answers on OpenStack for Fresher and Experience 
https://itcloudnet.blogspot.in/2017/05/interview-questions-and-answers-on.html

Error 1 :-  No Such File or Directory: /etc/pki/tls/certs/selfcert.crt


Solution 1:-  Just edit the Packstack file ( # vi 09.05.17.conf) then Search for CONFIG_HORIZON_SSL=y  (remove y put n) Save and Quit File

Error 2 :-  Failed to Stop postfix.service: unit postfix.service not loaded


Need to Create a New File of Postfix

Solution 2 :-   cd  /etc/init.d/
                       touch postfix
                       chmod +x /etc/init.d/postfix
                 



Error 3 :-   No such file or directory: '~/packstackca/certs/192.168.0.102ssl_vnc.crt'

Solution 3 :-   ln -s /etc/pki/tls/certs/ssl_vnc.crt  /root/packstackca/certs/192.168.2.102ssl_vnc.crt


Error 4 :-   packstack --allinone issues
cat /var/tmp/packstack/20170504-024009-_PiZap/openstack-setup.log
2017-05-04 02:40:23::ERROR::run_setup::1027::root:: Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 1019, in main
    raise Exception(output_messages.ERR_NO_ANSWER_FILE % confFile)
Exception: Error: Could not find file date +"%d.%m.%y".conf

Solution 4 :- 

Edit the Configuration file of environment
# vi or nano  /etc/environment
Search for LANG change to your prefer language see below image.

Solution 2 :- 

What is OpenStack ?
How to Solve All Error's During Installation of Single & Multiple Node OpenStack in CentOS 7 with Screenshot
https://itcloudnet.blogspot.in/2017/05/how-to-solve-all-errors-during.html

How to Install Openstack Using Devstack in All-In-One Single Machine on CentOS 7
https://itcloudnet.blogspot.in/2017/05/how-to-install-openstack-using-devstack.html

Interview Questions and Answers on OpenStack for Fresher and Experience 
https://itcloudnet.blogspot.in/2017/05/interview-questions-and-answers-on.html

OpenStack is a free and open-source software platform for cloud computing, mostly deployed as an infrastructure-as-a-service (IaaS). The software platform consists of interrelated components that control diverse, multi-vendor hardware pools of processing, storage, and networking resources throughout a data center.

Minimum Hardware Requirements

Note :-  To verify that the processor of a system running Red Hat Enterprise Linux has the required CPU extensions and that they are enabled, check the contents of the /proc/cpuinfo

Step1 :- grep -E 'svm|vmx' /proc/cpuinfo | grep nx

If any output is displayed, the processor is capable of hardware virtualization. Otherwise, it is still possible that your processor supports hardware virtualization because manufacturers sometimes just disable the virtualization extensions in the BIOS. Consult the system's BIOS and the motherboard manual provided by the manufacturer.

Single Node ("All in One") Deployments

Processor :- Intel 64bit or AMD64 CPU Extensions and the AMD-V or Intel VT Hardware Virtualization Extensions should be enabled

Memory :- A minimum of 2GB of RAM is recommended
                   A maximum of 4GB of RAM is recommended

Disk Space :-  A minimum of 50 GB of available disk space is recommended
                        A maximum of 1 TB of available disk space is recommended

Network Interface Cards 1 x 1 Gbps

Let Begins the Installation in CentOS Linux 7 (Core) - x86_64

Step1 :- First You Need to Login with Root Account Type  (root or su) then update and upgrade of system - yum update -y
              yum upgrade -y
 Step2 :- Now Type (ss -tulpn) in terminal to check all services are running
 Step2 :- Now we are removing, disabled and stop this services postfix firewalld and networkmanger Type systemctl stop postfix firewalld NetworkManager
or
systemctl stop postfix
systemctl stop firewalld
systemctl stop NetworkManager
Now Type systemctl disable postfix firewalld NetworkManager
or
systemctl disable postfix
systemctl disable firewalld
systemctl disable NetworkManager
 Step3 :-  Now disabled the SELINUX see below image
 Step4 :-  Set FQDN see below image or screenshot
 Step5 :- Now Update the NTPDATE by issuing a command see below image and Official NTP Public Pool Time Servers

 Step6 :- Install the RPM to setup the OpenStack repository by issuing a below command
 and after that update

 Step6 :- Now Install Main Openstack Packstack see below image
 Step7 :- Now edit the generated answer configuration file with a text editor
 and replace the following parameters to match the below values in images you can see
 Please consult http://www.pool.ntp.org/en/ server list in order to use a public NTP server near your physical location.



Step 9 :- After you finished editing save and close the file.

 Also, open SSH server configuration file and uncomment PermitRootLogin line by removing the front hashtag as illustrated on the below screenshot.
 Step10 :- restart the sshd service see below screenshot
 Step11 :- Finally start Openstack installation process via the answer file edited see below screenshot

In this Lab You Will be Learn About Configuration of Virtualization

Step1 :- Install the Virtualization Application

Note :- Restart the Machine and Boot From Virtualization Kernel Option from the GRUB Screen

Step2 :- To Create Virtual Machine 


Step3 :- To Start the Virtual Machine Execute the Following Commands

Step4 :- To Shutdown the Virtual Machine

In this Tutorial You Will be Learn About Web Authentication Client Configuration

Step1 :- Provide the IP Add of DNS Server is Configured

Step2 :- Provide the Website Information in Host File


Step3 :- Open the Browser & Type  

In this Tutorial You Will be Learn About Web Authentication

Step1 :- To Secure Website from Unauthorized Users.

Step2 :- Edit the Web Server File


Step3 :- Create a User and Set Password For Web Authentication   


Step4 :- Start the Service

In this Tutorial You Will be Learn About Port Based Client Configuration

Step1 :- Provide the IP Add of DNS if DNS Server is Configured

Step2 :- Provide the Website Information in Host File


Step3 :- Open the Browser & Type

In this Tutorial You Will be Learn About Port Based Hosting

Step1 :- Edit the Web Server File by Providing Port

Step2 :- Start the Service 

In this Tutorial You Will be Learn About IP Based Hosting

Step1 :- Assigning Another Virtual IP Add on Ethernet Device for IP Based Hosting

Step2 :- Make Sure the Hostfile Configuration by Providing New IP Add to Website 

Step3 :- Edit the Web Server File by Providing New IP Add

Step4 :- Start the Service by Restarting Apache

In this Lab You Will be Learn About Name Based Client Configuration

Step1 :- Provide the IP Address of DNS if DNS Server is Configured

Step2 :- Provide the Websites Information in Host File 


Step3 :- Open the Browser & Type

In this Lab You Will be Learn About Web Server (Apache)

Name Based Hosting

Step1 :- Assigning an IP Address in Linux, CentOS and Fedora 

Step2 :- Make Sure the Host File Configuration Should be Set

Step3 :- Edit the Main Configuration File

Step4 :- Create the Files with .html Extension 

Step5 :- Start the Web Service (Apache) by Restarting Services 

In this Lab You Will be Learn About DNS Client Configuration 

Step1 :- Provide the DNS Server IP Address in Resolve Conf File

Step2 :- Check the Resolution Answer by Using dig or nslookup Commands

In this Lab You Will be Learn About DNS Server Configuration

Step1 :- How to Check/Set IP Address & Hostname Entries

Step2 :- How to Check & Install the Packages 

Step3 :- How to Install the Packages 

Step4 :- Edit DNS File by Giving IP's 

Step5 :- Edit DNS File by Providing Zone File Names 

Step6 :- Create a Forward Zone and Reverse Zone 

Step7 :- Edit Forward Zone File 

Step8 :- Edit Reverse Zone File

Step9 :- How to Check the Syntax Errors of Configuration File

Step10 :- To Check the Zone File Syntax Errors

Step11 :- Restart the DNS Service


Step12 :- Provide the IP Address DNS

In this Lab You Will be Learn About How to Reset Root Password 

Step1 :- To Recover Root Password

Step2 :- Assigning Grub Password 

In this Lab You Will be Learn About To Share Data from Windows to Linux


Step1 :- To Share Data from Server by Using Mounting Method 

Note :- In Windows System Set Share Name on Selected Folder

Step2 :- To Share Data from Server by Using SMBClient Method 

In this Lab You Will be Learn About Configuration For Linux Client

Step1 :- To See the List Linux Samba Server in Network

Step2 :- To See the List of Shares on Samba Server 

Step3 :- To Share Data from Server by Using Mounting Method 

Step4 :- To Share Data from Server by Using SMBClient Method 

In this Lab You Will be Learn About Configuration For Windows Client

Step1 :- Login into Windows System

In this Lab You Will be Learn About Samba Server Configuration

Step1 :- Check & Install Packages

Step2 :- Create the Resources on Samba Server (File/Folders and Users) 

Step3 :- Edit the Main Configuration File 


Step4 :- Provide a Separate Samba Password for Samba Users

Step5 :- Check the Syntax of Configuration File 

Step6 :- Start the Services

In this Tutorial You Will be Learn About Yum Server

Step1 :- Creating a Repository at Server Side Where all rpms are Copied

Step2 :- Remove the Old Repodata 

Step3 :- Create a New Repodata 

Step4 :- At Client Side Edit the Yum Configuration File, Provide the Path of Repository

In this Lab You Will be Learn About FTP Client Side Configuration For Uploading Files

Step1 :- Required FTP Clients Application

Step2 :- To Upload a Single/Multiple File Use put/mput Command

Step3 :- To Check Uploaded Files, Move to FTP Server and Check 


Step4 :- To Block the FTP Server Users (For Eg:- Tom) Write the Username in 

In this Lab You Will be Learn About FTP Server Configuration For Uploading Files

Step1 :- Add New Directory in FTP Default Directory

Step2 :- Give Full Permission on New Directory 

Step3 :- Edit the FTP File as Follows 


Step4 :- Restart the FTP Service 

In this Lab You Will be Learn About FTP Server Configuration for Downloading Files

Step1 :- Required FTP Client Applications

Step2 :- To Download a Single/Multiple File Use get/mget Command

In this Lab You Will be Learn About FTP Server Configuration for Downloading Files


Step1 :- Create the Resources Files, Directory and Users

Step2 :- Add Some Files or Any Extensions Inside /var/ftp/pub

Step3 :- Start the Services 

In this Lab You Will be Learn About Boot Process

Step1 :- To View the Default runlevel on Boot

Step2 :- How to View the Present runlevel 

Step3 :- How to Switch to Another runlevel 

Step4 :- How to View the Grub Configuration File 

Step5 :- How to View the Status of the Services in All runlevels 

Step6 :- How to View the Status of a Particular Service 

Step7 :- How to Set the Status of a Service 

  

In this Tutorial You Will be Learn About NIS Client Side Configuration


How to NIS Client Side Configuration in Redhat Linux, Fedora and CentOS

Step1 :- How to Check IP and Host Entries

Step2 :- Make the Client Machine as Member of NIS-Server

Step3 :- How to Share Home Directory of User Mount to NFS Exported Directory

Step4 :- How to Check Result Log in as a NIS Server User

In this Lab You Will be Learn About Network File System (NFS) Server and Client Side Configuration



How to Configure Network File System (NFS) Server & Client in Redhat Linux, Fedora and CentOS

Step1 :- Network File System (NFS) Server Configuration

In this Lab You Will be Learn About Network Information Service (NIS)



How to Configure Network Information Service (NIS) in Redhat Linux, CentOS and Fedora.

Step1 :- How to Check IP and NIS Domain Entries

Step2 :- How to Check & Install the Packages

Step3 :- How to Install the Packages

Step4 :- How to Edit Main Configuration File

Step5 :- How to Restart the Services

Step6 :- How to Create NIS Databases

Step7 :- How to Create New Users Account

Note :-  If a New User/Group/Password's are Created or Modified, then the NIS Database has to be Manually Updated

In this Lab You Will be Learn About Package Management


How to Install Packages Through RPM or YUM in Redhat Linux, Fedora and CentOS.

Step1 :- How to Install From DVD Go to Packages Location Generally in /media/dvd/packages

Step2 :- How to Install From Server by Using NFS Services

Step3 :- How to Install Packages

Step4 :- How to Remove the Packages

Step5 :- How to Query the Packages

Step6 :- How to Install Application From Server with YUM at Client Side Edit the YUM Configuration File.

Step7 :- Installing through YUM

In this Lab You Will be Learn About Introduction to Linux, Networking Command, 


Step1 :- How to Set the Hostname Temporarily in Linux, Ubuntu

Step2 :- How to View the Hostname in Linux, Ubuntu

Step3 :- How to Set Hostname Permanently in Linux, Ubuntu

Step4 :- How to Set IP Address Temporarily in Linux, Ubuntu

Step5 :- How to View the Interfaces of Ethernet in Linux, Ubuntu

Step6 :- How to Set IP Address Permanently in Linux, Ubuntu

Step7 :- Restart the Service to Enable New IP Address

Step8 :- How to Set or View the Network Parameters

Step9 :- How to Enable the LAN Card

Step10 :- How to Disable LAN Card

In This Tutorial You Will be Learn About Backup / Recovery and Dump

In This Tutorial You Will be Learn About RAID

How to Configure RAID in Ubuntu, CentOS

Step1 :- How to Install the Required Packages in RAID

Step2 :- How to Create the Required Partition

Step3 :- How to See the Detail Information of  /dev/md0

Step4 :- Format the RAID Meta Device

Step5 :- Mount the Partition

Step6 :- Write Some Content Inside the RAID Partition

Step7 :- To Add a New Device as Spare

Step8 :- To See the Detail Information of  /dev/md0

Step9 :- To Remove the Faulty Device

Step10 :- To Stop the RAID First Unmount  the Meta  Device

Step11 :- To Activate or Assemble the RAID Meta Device

In This Tutorial You Will be Learn About Logical Volume Manager (LVM) 

How to Configure Logical Volume Manager (LVM)

How to Configure Logical Volume Manager (LVM) in Ubuntu Desktop or Server 14.04, 15.04, 16.04 & 17.04. Same in Linux Mint 17.3 and Debian 8.


Step1 :- How to View Hard Disk Name and Partition Information

Step2 :- How to Create 3 Partitions

Step3 :- How to Activate the Partition Table

Step4 :- Create a Physical Volume

Step5 :- How to View Physical Volume

Step6 :- How to Create Volume Group

Step7 :- How to Display Volume Group Information

Step8 :- How to Create Logical Volume

Step9 :- How to View Logical Volume Information

Step10 :- Format the Logical Volume

Step11:- To Resize the Logical Volume

Step12 ;- To Remove Logical Volume

Step13 :- To Extend the Volume Group

In This Tutorial You Will be Learn About Access Control List (ACL)

How to Configure Access Control List (ACL)

How to Configure Access Control List (ACL) in Ubuntu Desktop or Server 14.04, 15.04, 16.04 & 17.04. Same in Linux Mint 17.3 and Debian 8.

Step1 :- Create Required Users & Group

Step2 :-  Add a File by Using Cat Command




Step3 :-  To Apply ACL on Users and Groups