Ansible is CM tool and orchestration engine. Ansible, unline other does not utilize master-minion setup instead uses the basic logic of shh. Ansible is dependant on python libraries. It uses agentless architechture.
Ansible Tower is a web-based GUI for ansible containing important Ansible features.
Ansible tower features:
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Role-based access control: you can set up teams and users in various roles. These can integrate with your existing LDAP or AD environment.
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Job scheduling: schedule your jobs and set repetition options
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Portal mode: this is a simplified view of automation jobs for newbies and less experienced Ansible users. This is an excellent feature as it truly lowers the entry barriers to starting to use Ansible.
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Fully documented REST API: allows you to integrate Asible into your existing toolset and environment
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Tower Dashboard: use this to quickly view a summary of your entire environment. Simplifies things for sysadmins while sipping their coffee.
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Cloud integration: Tower is compatible with the major cloud environments: Amazon EC2, Rackspace, Azure.