Ansible: The changed_when parameter
By default, when a playbook is executed, in the display mode stdout we will see various piece of information. IT provides us a the sections through which the execution is proceeding, displaying the name is…
Ansible: Add and remove crontab files
Ansible can be used to remotely configure cron entries or even create a crontab files in managed nodes. The below example creates a crontab file named “/etc/cron.d/the-date-time” in the managed nodes. First let us verify…
Ansible : Running jobs as a specific user
Though ansible server will run jobs in managed nodes as a root user, we can specify the user account using which the jobs should get executed in the remote nodes. This is done using the…
Redhat – Boot Target
A Linux systems can boot up in various modes based on user preference. For example we can configure a node to start on GUI mode, where once the node boots, the user will get a GUI based…
Ansible: Scheduling jobs using AT and CRON
Ansible provides a means to schedule jobs to be executed on a future time, weather it is a one time job or ones to be repeated at regular interval. This is done using the modules…
AT command : Running one time future task
Unlike the the cron job is mainly used to schedule repetitive tasks, the “at” command is used to run a command just once, but schedule at a later time. That yum package to be installed…
Ansible: Adding a line to a file. At the end of file, and replacement of line
Ansible allows admins to add lines to files. The below playbook adds a sudoers configuration file, and adds an entry to allow users of group “webadmin” sudo to all users and execute all commands as root….
Ansible: The Authorized Key Module
In order for a user to ssh to a remote node, usually some form of authentication such as user credentials, SSH keys, etc are required. However Linux provides provision for password-less authentication too once a…
Ansible: The The Known Hosts Module
When a user access a remote node using ssh for the first time, a prompt will appear asking the following: This key is not known by any other names. Are you sure you want to continue…
Ansible: User management – Add user – ssh key
In this section we will try to understand few of the operations we can do using User module. In the below example, we will create anew user named shiju in the managed node, and will…