Scenario: How to get the list of expired local users on Linux.
System :
CentOS/RHEL 6/7
IP address: 192.168.99.11
Hostname : horse
Steps:
1) Create the bash script file with file name listchageusers.sh
$ vi /home/bachem/listchageusers.sh
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Scenario: How to get the list of normal users and System users in Linux.
System : CentOS/RHEL 6/7
Steps:
1) Login as local users (work without login to root), example I login as bachem.
2) Create the bash script file with file name listusers.sh
$ vi /home/bachem/listusers.sh
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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 ~]#
Scenario: Reset root password CentOS/RHEL 7
System: CentOS/RHEl 7
Steps:
1) On first boot menu select first kernel(on top) then Press ‘e’
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Scenario: Create LUN in Openfiler from new disk.
System: Openfiler ESA 2.9
Steps:
1) Click Volumes >> Click Block Devices,in picture below we see new drive /dev/sdb and /dev/sdc as plan we will create LUN in /dev/sdb then continue click /dev/sdb.
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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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Scenario: Added new disk /dev/sdc then extend Volume Group and extend Logical Volume /var on CentOS 7
System: CentOS 7
Steps:
– After added disk /dev/sdc then create partition on /dev/sdc
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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 ~]#
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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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