Lab 004: Ansible Lineinfile Module
Requirements
The Nautilus DevOps team want to install and set up a simple httpd web server on all app servers in Stratos DC. They also want to deploy a sample web page using Ansible. Therefore, write the required playbook to complete this task as per details mentioned below.
We already have an inventory file under /home/thor/ansible directory on jump host. Write a playbook playbook.yml under /home/thor/ansible directory on jump host itself. Using the playbook perform below given tasks:
-
Install httpd web server on all app servers, and make sure its service is up and running.
-
Create a file /var/www/html/index.html with content: "This is a Nautilus sample file, created using Ansible!"
-
Using lineinfile Ansible module add some more content in /var/www/html/index.html file. Below is the content: "Welcome to Nautilus Group!"
-
Also make sure this new line is added at the top of the file.
-
The /var/www/html/index.html file's user and group owner should be apache on all app servers.
-
The /var/www/html/index.html file's permissions should be 0777 on all app servers.
Note: Validation will try to run the playbook using command ansible-playbook -i inventory playbook.yml so please make sure the playbook works this way without passing any extra arguments.
Steps
Proceed to the correct directory.
cd /home/thor/ansible/
It's good practice to check the inventory first to ensure all servers are defined there. The passwords are hashed, but you can find them in the official Project Nautilus documentation.
$ cat inventory
stapp01 ansible_host=172.16.238.10 ansible_ssh_pass=******* ansible_user=tony
stapp02 ansible_host=172.16.238.11 ansible_ssh_pass=******* ansible_user=steve
stapp03 ansible_host=172.16.238.12 ansible_ssh_pass=******* ansible_user=banner
In addition to checking the inventory, verify if we can ping all servers using the ping module.
$ ansible -m ping all -i inventory
stapp03 | SUCCESS => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python"
},
"changed": false,
"ping": "pong"
}
stapp01 | SUCCESS => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python"
},
"changed": false,
"ping": "pong"
}
stapp02 | SUCCESS => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python"
},
"changed": false,
"ping": "pong"
}
Next, create the playbook and add the tasks base on the requirements.
$ vi playbook.yml
---
- name: Install and Configure Apache Web Server on all App Servers
hosts: all
become: yes
become_user: root
tasks:
- name: Install apache web server
yum:
name: httpd
state: present
- name: Start apache web service
service:
name: httpd
state: started
- name: Create the index.html file
copy:
dest: /var/www/html/index.html
content: |
This is a Nautilus sample file, created using Ansible!
- name: Insert line at the beginning of the file
lineinfile:
path: /var/www/html/index.html
line: "Welcome to xFusionCorp Industries!"
insertbefore: BOF
- name: Set the file permissions and owner to 'apache'
file:
path: /var/www/html/index.html
owner: apache
group: apache
mode: "0777"
Run the playbook.
ansible-playbook -i inventory playbook.yml
Once it's done, you should see this in the PLAY RECAP output.
PLAY RECAP ***************************************************************************************************************************************************
stapp01 : ok=6 changed=5 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
stapp02 : ok=6 changed=5 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
stapp03 : ok=6 changed=5 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
To verify, login to the app server 1 and see the index.html file.
sshpass -p '********' ssh -o StrictHostKeyChecking=no tony@172.16.238.10
$ cat /var/www/html/index.html
Welcome to xFusionCorp Industries!
This is a Nautilus sample file, created using Ansible!
Also, verify if the web server is running.
$ sudo systemctl status httpd
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
Active: active (running) since Thu 2022-12-08 01:45:25 UTC; 3min 56s ago
Docs: man:httpd(8)
man:apachectl(8)
Main PID: 928 (httpd)
Status: "Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec"
CGroup: /docker/1e584ae1e779521b3dd2c0e31d51c6d88326c8c2db258366fae438da3e5718ea/system.slice/httpd.service