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Get started with Ansible - installation and basics.We start by creating an SSH key into my Digital Ocean account. To create this SSH key, we'd locally run:
That SSH key will be added to any server I create on Digital Ocean. This will ensure Ansible can log into any server we want to provision.
For this example, I create 3 servers on Digital Ocean. Download microsoft access bill of material template free.
In my local server I connect to the servers like so:
I can see I can connect, so I know the key-pair authentication is working over SSH.
Install Ansible
We're using an Ubuntu server (locally, via Vagrant). To install Ansible, run:
You can see how to install Ansible on other distributions here.
Ansible is agentless - we don't need to install an agent on the servers we provision. The servers just need Python and the ability to connect over SSH.
Configure Ansible
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Ansible is inside of /etc/ansible. Lets move the original out of the way and edit create a new one.
Edit /etc/ansible/hosts and make it look like this:
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Now we have our three servers defined as hosts for Ansible to use.
Functional shift. Definition of functional shift.: the process by which a word or form comes to be used in another grammatical function. In linguistics, functional shift occurs when an existing word takes on a new syntactic function. If no change in form occurs, it is called a zero derivation. For example, the word like, formerly only used as a preposition in comparisons (as in 'eats like a pig'), is now also used in the same way as the subordinating conjunction as in many dialects of English (as in 'sounds like he means it').
Run Some Commands on Each Host
We'll run some arbitrary commands.
We run into an SSH error, it doesn't find the correct key, falling back to password.
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Instead, we try the following, which works:
Another way we can do this is as follows, which uses the 'shell' command. This let's us run any shell command on the servers.
Install Nginx
We'll use the 'apt' module to install Nginx across each server. This let's us declaratively tell Ansible what we want the desired state to be.
This will install Nginx on each server!