Category: Centos

Centos

How to configure DNS server on Centos 7

Domain Name System(DNS) is a name resolution server. its basic function is translated (convert) the IP address into domain name or translated (convert) the domain name into IP address. it has a collection of domain names with mapped IP addresses...

Types of permission in Linux (Centos, Redhat, Ubuntu)

Linux having three type of permission as below, 1. Read permission 2. Write permission 3. Execute permission 1. Read Permission: Read permission give you the authority to open and read a file. Read permission on a directory gives you the...

How to install openstack in centos 7.4 with queen

Step 1: Update the Centos Repository yum update -y     Step 2: Disable and stop the firewall and selinux systemctl disable firewalld systemctl stop firewalld setenforce 0 Step: 4 Disable and stop the Network Manager and start the network service systemctl disable NetworkManager systemctl stop NetworkManager systemctl enable network systemctl start network Step: 5...

Linux directory structure and details

Linux common directory structure of Centos/Ubuntu Use of directory’s /bin      1. contains user(Essential) command binaries (executable file) 2. Examples: /bin/top,/bin/mv,/bin/cut,/bin/cp,/bin/rename,/bin/mkdir,etc… /boot 1. contains  boot related file 2. Examples: grup, boot loader,kernel /dev    1. contains internal attached device ...

How to create LVM Partitions ?

LVM partition has three levels of structure as below Physical volume Volume Group Logical volume Step: 1 – Physical volume creation First, we have to create the physical volume before creating the volume group, Now I’m going to make physical...

What is LVM Partition ?

LVM is a tool for Logical Volume Management which includes Allocating disks Striping Mirroring Snapshot Resizing logical volumes LVM Architecture LVM functions by three layering abstractions Physical Volumes Physical block devices or other disk-like devices (for example, other devices created...

What is firewalld ?

Firewalld provides a dynamically managed firewall with support for network/firewall zones that define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings, ethernet bridges and IP sets. There is a separation of runtime...