Test Environment –

GCP Account
Fedora 32

What is Ansible –

– Anisble is purely based on Python
– Its a Configuration Management tool used to configure and manage the Linux system for all the types of operations like Installating, Patching, Deployment of Applications, File Management, Service Management, Package Management
– Ansible using the SSH protocol based on the native OpenSSH package for communication with the Linux nodes which it manages

In this article we will see how we can install Ansible and spin up a Google compute engine which we will try to manage using the Ansible as a Managed node. If you are interested in watching the video. Here is the youtube vidoe with the same step by step procedure.

Procedure –

Step1: Install the required dependencies

Ansible is dependent on Python. By default most of the Linux system are having the Python package already installed. But if its not installed lets get that installed with the latest available version along with the Python pip and Python-devel package on our system.

Python
Python-pip
Python-devel

[admin@fedser ~]$ sudo dnf install -y python3 python-pip python3-devel

Step2: Install Ansible using pip

Ansible can be installed using different methods, one of them using the Python pip tool and other is installing the rpm packcage of Ansible provided by the linux system.

[admin@fedser ~]$ sudo pip install ansible
or
[admin@fedser ~]$ sudo dnf -y install ansible

Step3: Validate the Ansible installation

[admin@fedser ~]$ ansible --version
ansible 2.10.7
  config file = None
  configured module search path = ['/home/admin/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.8/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 3.8.7 (default, Jan 20 2021, 00:00:00) [GCC 10.2.1 20201125 (Red Hat 10.2.1-9)]

Step4: Spin up a GCP Compute Engine Instance

Here you need to have the GCP account. If you dont have any sign up and register for the free tier account which provides $300 credit for 90 days and you can use GCP to spin up a Compute Engine Instance.

ansiblenode2 external IP – 35.196.18.237

Step5: Generate SSH private and public key using ssh-keygen

In this step we are going to generated SSH key pair. The public key which gets generated will need to be copied into the instance metadata for managing the GCP Compute instance using SSH remotely.

[admin@fedser ~]$ ssh-keygen -t rsa -f ~/.ssh/gcpssh -C sudhirbhoga

Now, lets copy the SSH public key to the GCP instance metadata ssh keys

Step6: Validate that Remote SSH login to GCP instance

You can check if you are able to login with SSH remotely. If you face any issue check if the SSH public key is properly uploaded into the metadata section of the Compute Engine instance also check if there is no firewall blocking on port 22.

[admin@fedser ~]$ ssh sudhirbhoga@35.196.18.237

Step7: Create an inventory file and updated the ansiblenode2 external IP address

This inventory file is used by ansible by default to get the list of servers that it is going to manage.

[admin@fedser ~]$ cat /etc/ansible/hosts 

[stack]

35.193.191.102 192.168.47.128 35.196.18.237

Step8: Manage GCP Instance using Ansible Configuration management tool

We can maange and run ad-hoc commands on to get the information related to our GCP instance as shown below.

[admin@fedser ~]$ ansible stack -a "free -m" -u sudhirbhoga
...}
35.193.191.102 | CHANGED | rc=0 >>
              total        used        free      shared  buff/cache   available
Mem:           3737         283        2908           8         545        3223
Swap:             0           0           0
35.196.18.237 | CHANGED | rc=0 >>
              total        used        free      shared  buff/cache   available
Mem:           3737         231        3104           8         401        3285
Swap:             0           0           0

[admin@fedser ~]$ ansible stack -a "df -hP" -u sudhirbhoga
...
35.193.191.102 | CHANGED | rc=0 >>
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           1.9G     0  1.9G   0% /dev/shm
tmpfs           1.9G  8.4M  1.9G   1% /run
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda2        20G  2.5G   18G  13% /
/dev/sda1       200M  6.9M  193M   4% /boot/efi
tmpfs           374M     0  374M   0% /run/user/1001
35.196.18.237 | CHANGED | rc=0 >>
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           1.9G     0  1.9G   0% /dev/shm
tmpfs           1.9G  8.4M  1.9G   1% /run
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda2        20G  2.5G   18G  13% /
/dev/sda1       200M  6.9M  193M   4% /boot/efi
tmpfs           374M     0  374M   0% /run/user/1000

Hope you learnt something in this article. Thank you..