By Jeff Geerling
Covers Ansible 2.0!
Ansible is an easy, yet strong, server and configuration administration device (with a couple of different methods up its sleeve). This booklet is helping these conversant in the command line and simple shell scripting commence utilizing Ansible to provision and deal with at any place from one to hundreds of thousands of servers.
The e-book starts with basics, like fitting Ansible, developing a easy stock dossier, and simple options, then publications you thru Ansible's many makes use of, together with ad-hoc instructions, simple and complex playbooks, software deployments, multiple-provider server provisioning, or even Docker orchestration! every thing is defined with pertinent real-world examples, usually utilizing Vagrant-managed digital machines.
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Additional resources for Ansible for DevOps: Server and configuration management for humans
Service: name=ntpd state=started enabled=yes I’ll get into what this playbook is doing in a minute. For now, let’s run the playbook on our VM. yml file, and enter vagrant provision. You should see status messages for each of the ‘tasks’ you defined, and then a recap showing what Ansible did on your VM—something like the following: PLAY RECAP ********************************************************** default : ok=3 changed=1 unreachable=0 failed=0 Ansible just took the simple playbook you defined, parsed the YAML syntax, and ran a bunch of commands via SSH to configure the server as you specified.
Learning about your environment Now that we trust Vagrant’s ability to set hostnames correctly, let’s make sure everything else is in order. 3M 115M 4% /run 120M 0 120M 0% /sys/fs/cgroup 497M 124M 374M 25% /boot 233G 217G 17G 94% /vagrant It looks like we have plenty of room for now; our application is pretty lightweight. 5 | success | rc=0 >> total used free Mem: 238 186 52 -/+ buffers/cache: 116 121 Swap: 1055 0 1055 shared 4 buffers 1 cached 69 shared 4 buffers 1 cached 72 shared 4 buffers 1 cached 67 Memory is pretty tight, but since we’re running three VMs on our localhost, we need to be a little conservative.
For now, we need to allow MySQL access for one user from our app servers. The MySQL modules require the MySQL-python module to be present on the managed server. Why MariaDB and not MySQL? RHEL 7 and CentOS 7 have MariaDB as the default supported MySQL-compatible database server. Some of the tooling around MariaDB still uses the old ‘MySQL*’ naming syntax, but if you’re used to MySQL, things work similarly with MariaDB. *:ALL state=present" At this point, you should be able to create or deploy a Django application on the app servers, then point it at the database server with the username django and password 12345.
Ansible for DevOps: Server and configuration management for humans by Jeff Geerling