Scenario: Patching run yum update using Ansible to RHEL 6/7 remote machine
System: RHEL 7, Ansible 2.6 (Callback and ansible log is active)
Remote System: RHEL 6/7 (not using ssh key), same root password, PermitRootLogin yes
Example yum update host group devservers, here my steps:
1) Empty ansible log.
# cat /dev/null > /var/log/ansible.log
2) Input hosts devservers in /etc/ansible/hosts
# vi /etc/ansible/hosts
[devservers]
192.168.99.18
192.168.99.19
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: Set up Ansible callback to monitor running task on remote machine.
Ansible system: CentOS 7, Ansible 2.6
Remote machines:
Both have same root password
1. CentOS 7, ip address: 192.168.99.18
2. CentOS 6, ip address: 192.168.99.19
I set up callback plugins to see running ansible-playbook task on remote machine and it is fun and useful.
To set up callback, edit /etc/ansible/ansible.cfg and change the value to minimal.
# vi /etc/ansible/ansible.cfg
stdout_callback = minimal
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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System: CentOS 7, Ansible-2.6.0
Step 1 — Installing Ansible
To begin exploring Ansible as a means of managing our various servers, we need to install the Ansible software on at least one machine.
To get Ansible for CentOS 7, first ensure that the CentOS 7 EPEL repository is installed:
# yum install epel-release
Install Ansible
# yum install ansible
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