How to add sudo user on CentOS 7

Scenario: add sudo user on CentOS 7
System: CentOS 7

Steps to Create a New Sudo User
– Log in to your server as the root user.
– Use the adduser command to add a new user to your system,example add user with username bachem.

[root@horse ~]# useradd bachem
[root@horse ~]# passwd bachem
Changing password for user bachem.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root@horse ~]#

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Install Openfiler

Scenario: Installing Openfiler at sda 40GB size.

System: Openfiler ESA 2.99.1

Steps:
– Download Openfiler iso from here.
– Booting from Openfiler iso/DVD.
– Select Graphical Mode press Enter.
– Click Next.
– Select Keyboard -> Click Next then select Yes to initialize drive,erasing ALL DATA.
– Continue click Next if using default Openfiler partition table. I setup LVM for /var and swap for easy increase the space in the future.
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Create Partition on New Disk using Parted on CentOS


Scenario: Create partition and Volume Group 60GB size from 100GB disk on new disk using Parted on CentOS
System: CentOS/RHEL 6 or 7

Steps:
Show new disk:
# fdisk -l | grep sd

[root@server ~]# fdisk -l | grep sd
Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectors
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    81797119    39848960   8e  Linux LVM
Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors
[root@server ~]#

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Mount Windows Folder Sharing on RHEL 6/CentOS 6

Scenario:
-Mount Windows Folder Sharing (CIFS) on RHEL 6/CentOS 6.
-Set only Linux user >> user1 that have RWX access.
-Hide sharing credentials from other Linux users.
-Mount permanent at boot.

System: CentOS 6

Steps:
1) Edit /etc/fstab
# vi /etc/fstab
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Setup Virtual Domain Postfix

Scenario:
– Forward certain email recipient to another email address.
– Forward local Unix account email address to another email recipient because in the Postfix server don’t have mailbox.

System:
Postfix on CentOS 7/RHEL 7 (also work on CentOS 6/RHEL 6)

Steps:
– Edit main.cf
# vi /etc/postfix/main.cf
Edit the below parameter.

virtual_alias_domains = example1.com,example2.com
virtual_alias_maps = hash:/etc/postfix/virtual

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Setup Ethernet Bonding on RHEL 6

Scenario: Configure 4 ethernet into 2 ethernet bond0 and bond1 on RHEL 6/CentOS 6.
System: RHEL 6.9

Steps:
1) Create new file bond0 (Eth0+Eth1) with IP Address = 172.16.10.70
# vi /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
IPADDR=172.16.10.70
NETMASK=255.255.255.0
TYPE=Bond
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=none
USERCTL=no
PEERDNS=yes
IPV6INIT=no

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