Today we study an example of using Ansible to configure nginx.

We create an Ansible playbook named web-notls.yml.

Type the following commands:

- name: Configure webserver with nginx  hosts: host1  become: yes  become_user: root  become_method: su  tasks:    - name: install nginx      yum: name=nginx    - name: create sites-available directory      file: path=/etc/nginx/sites-available state=directory mode=0755    - name: copy nginx config file      copy: src=files/nginx.conf dest=/etc/nginx/sites-available/default    - name: create sites-enabled directory      file: path=/etc/nginx/sites-enabled state=directory mode=0755    - name: enable configuration      file: >        dest=/etc/nginx/sites-enabled/default        src=/etc/nginx/sites-available/default        state=link    - name: copy index.html      template: src=templates/index.html.j2 dest=/usr/share/nginx/html/index.html mode=0644    - name: restart nginx      service: name=nginx state=restarted

We need to extra files.

1) files/nginx.conf

server {        listen 80 default_server;        listen [::]:80 default_server ipv6only=on;        root /usr/share/nginx/html;        index index.html index.htm;        server_name localhost;        location / {                 try_files $uri $uri/ =404;        }}

2) templates/index.html.j2

      
nginx, configured by Ansible
 
If you can see this, Ansible successfully installed nginx.
 
{
   { ansible_managed }}
 

Then, we run ansible-playbook and got an error:

TASK [restart nginx] *****************************************************************************************************************************fatal: [host1]: FAILED! => {"changed": false, "failed": true, "msg": "Unable to start service nginx: Job for nginx.service failed because the control process exited with error code. See \"systemctl status nginx.service\" and \"journalctl -xe\" for details.\n"}

Why is that?

After running 

systemctl status nginx.service

The output is

nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)

If we run 

lsof-i -P -n

It is found that 

httpd     ....................TCP *:80 (LISTEN)

Port 80 was used by httpd.

After we stopped httpd, the error disappeared.

Then we type "localhost" in a web browser, we got the following words printed:

nginx, configured by Ansible

If you can see this, Ansible successfully installed nginx.

Ansible managed