The execution order is authoritative: Ansible always runs playbooks in the order that they define themselves. For administrators who regularly spend time in Puppet’s dependency hell, this fact greatly facilitates the migration to Ansible. Only when database is working on the two target hosts will it even start to process the backend server. In other words, if you stipulate for a playbook that the database role is restricted to the hosts db1 and db2, and the webserver role to the host backend, Ansible will process the steps precisely in this way.
If you only take one thing from this article, let it be this: Ansible can help you maintain and manage any server architecture you can imagine, and it’s a great place to get started in the world of automation. Hopefully this article gave you an idea as to why Ansible may be useful in your server architecture.
It also fits with its push around emerging technologies for DevOps, as Red Hat was an early supporter of container technologies Docker and Kubernetes. The Ansible deal is Red Hat placing its bets on where the industry and enterprise customers are going with faster, agile software release processes and management, Lyman said.
Ansible designates the hosts that it manages with an inventory file that simply lists the hosts and the IP addresses on which they are addressable – and that’s it. Listing 3 shows a complete inventory definition that creates the backend host described in Listing 2.
The agent is responsible for changing the server configuration to the target state. Any host that is managed by Puppet has at least one Puppet agent. Either you have a complete Puppet configuration on each host, in which case the agent simply accesses and implements the configuration locally, or you run Puppet with a master server, in which case the agents on the various hosts connect to the master server to pick up their configurations.
For the purposes of this article, having an Immutable server architecture means that we have the ability to create, destroy, and replace servers at any time without causing service disruptions. When starting a new project with Ansible, one of the first things to think about is whether or not you want your architecture to support Immutable servers.
One of the first projects I used Ansible for was to simultaneously deploy and remove a monitoring solution. This was incredibly easy with the help of Ansible. The project was simple: remove Zabbix and replace it with Server Density. I ended up enjoying the project so much, I open sourced it.
Red Hat admins await an Ansible vs. Puppet showdown – SearchITOperations;
Ansible 2. 0 rescales, resets configuration management.
People favor open source because of the flexibility and ability to avoid vendor lock-in, but a lack of infrastructure ownership creates limitations, particularly in public cloud, said Larry Carvalho, research manager at IDC, an analyst firm in Framingham, Mass. It’s a positive that OpenShift can run anywhere, but concerns about vendor lock-in and portability haven’t exactly hindered Amazon’s ability to lure in customers.
In other words, Ansible does not use its own protocol, nor does it need client software (Figure 2). Administrators can even install the main Ansible host from another computer, such as their own laptops. Ansible uses SSH to talk to the individual computers and run the configuration steps.
2013 · This definition explains what Puppet is and how it can be used to automate configuration management.
The emerging open source configuration management platform eases management of heterogeneous IT environments. At the same time, it could blow new life into the Satellite 6 management solution, which hasn’t been received with an equal amount of enthusiasm by all Red Hat customers. Red Hat acquired Ansible late in 2015.