Saltstack Refresh Course 2: Salt State

Shenzhen, China

Setting up a Webserver

Setting up a Webserver

I want to define a webserver state using a Salt state file and apply it to my minion server:


Application	Apache
File	/var/www/html/index.html
Users	webadmin
SSH Key	For webadmin user

Init.sls

Every minion that with a name that starts with "salt-minion" should have the apache state applied to it. We can then continue and and create said state in:

/srv/salt/base/apache/init.sls

install_apache:
  pkg.installed:
    - pkgs:
        - apache2

index_html:
  file.managed:
    - name: /var/www/html/index.html
    - source: salt://apache/templates/index.html
    - user: www-data
    - group: www-data
    - mode: 644

apache_service:
  service.running:
    - name: apache2
    - enable: True

Note that the Apache package for Ubuntu is called apache2. For CentOS you would have to use the package name httpd instead.

File Management

This state file defines an index page that we want to use with Apache that we can now create in:

/srv/salt/base/apache/templates/index.html

<!DOCTYPE html>

<html lang="en">
  <head>
    <meta charset="utf-8" />

    <title>Salty Dayz, Sailor!</title>
    <meta name="description" content="Salt Apache Template" />
  </head>

  <body>
    <h1>Salty Dayz, Sailor!</h1>
  </body>
</html>

Run your State

We can now apply this state to our minion server with:

salt 'salt-minion*' state.sls apache

salt-minion:
----------
          ID: install_apache
    Function: pkg.installed
      Result: True
     Comment: All specified packages are already installed
     Started: 10:05:29.993312
    Duration: 37.941 ms
     Changes:
----------
          ID: index_html
    Function: file.managed
        Name: /var/www/html/index.html
      Result: True
     Comment: File /var/www/html/index.html updated
     Started: 10:05:30.033993
    Duration: 39.989 ms
     Changes:
              ----------
              diff:
                  ---
                  +++
                  @@ -1,4 +1,14 @@
                   <!doctype html>
                  +
                  +<html lang="en">
                  +<head>
                  +  <meta charset="utf-8">
                  +
                  +  <title>Salty Dayz, Sailor!</title>
                  +  <meta name="description" content="Salt Apache Template">
                  +</head>
                  +
                   <body>
                  -    <h1>Ubuntu Rocks.</h1>
                  +  <h1>Salty Dayz, Sailor!</h1>
                   </body>
                  +</html>
              group:
                  www-data
              user:
                  www-data
----------
          ID: apache_service
    Function: service.running
        Name: apache2
      Result: True
     Comment: The service apache2 is already running
     Started: 10:05:30.074597
    Duration: 38.561 ms
     Changes:

Summary for salt-minion
------------
Succeeded: 3 (changed=1)
Failed:    0
------------
Total states run:     3
Total run time: 116.491 ms

Verify that the website is online by first getting your minions IP address:

salt 'salt-minion*' grains.get ipv4

salt-minion:
    - 127.0.0.1
    - 172.17.0.1
    - 172.18.0.1
    - 192.168.2.111

And then accessing the Apache service with your web browser http://192.168.2.111:80.