SALTSTACK CHANGE MINION NAME HOW TO
SALTSTACK CHANGE MINION NAME INSTALL
SALTSTACK CHANGE MINION NAME CODE
SALTSTACK CHANGE MINION NAME SERIES

If, like me, you like to actually see the event being thrown in real-time, SSH on to your saltmaster, and run: sudo salt-run state.event pretty=TrueĪnd it’s much the same when I try and stop the nginx service either via the saltmaster or directly on the ubuntu server itself: You should see an event that has been created by the minion and fired over to the saltmaster. Once that is changed jump back into the saltstack console and head over to Activity > Completed.

SALTSTACK CHANGE MINION NAME CODE

The above code will create an event when the index.html file is changed within the /var/Lets jump onto the server and see whether an event will be created when we open the file.įirstly ssh onto your ubuntu server: ssh, change to the folder and open the file making a change and saving it. Lets create a job, much the same as we have done before to push the beacon to the minion. In the service section, you can see that we’re monitoring the nginx service in this case, this is native and doesn’t require the inotify package, hence when it’s not contained within the itnotify block. We have also added a line to ensure that this event isn’t created during a state run, as this would be a legitimate change to the file if it came from the master.

The mask: element defines which actions generate an event, so we’ve kept it simple here and just chosen modify (which is self explanatory) and close_write, which is where a writeable file is closed. There are a few interesting bits to this, firstly you can see where we’re using the inotify component and which file we’re monitoring, in this case /var/This is the file that has our content in, so any changes to it will show publically. # Description: Beacon to deploy to minion to protect changes to index.html and nginx service Next we need to create a beacons.sls file to define what we want to self-heal. Next, we need to tell salt to deploy the beacon, essentially copying the file down from the master to the minion, and allowing it to create the directories it needs to make that happen (makedirs)

SALTSTACK CHANGE MINION NAME INSTALL

# Description: Install Beacon on Minion to monitor index.html Path: /beacon/beacon.sls # Name: beacon.sls For this we need an additional package called ‘pyinotify’, so we’ll declare that in the state file too So lets get started, first up we need to write a state file to install the beacon on the minion. So by default, it monitors the file every 5 seconds but is smart enough to disable monitoring whenever a job is ran which is pretty cool. To remind you, this is generated by the jinja file which adds some dynamic content.

Whether that be restoring a file back to its preferred state (the one that is stored on the master), restarting a service, alerting, the list goes on.įor my example though, I’m going to make a change to the index.html file. The reactor, does exactly what you’d expect, reacts and provides an output. This event is sent back to the salt master where the ‘reactor’ lives. This activity can be file changes, system load, the status of a service, a user logging in or even network and disk utilisation. We can define a beacon on a minion which sends an event whenever a particular activity occurs. But how do you ensure that your state stays consistent between your job runs? Enter beacons and reactors.īefore we start with the hand on side of things, I think its best I explain how this works.

SALTSTACK CHANGE MINION NAME HOW TO

If you’ve been following the 3 previous blogs in this series, you’ll know all about SaltStack Config! You’ll know about its capabilities, how to attach a minion, how to deploy software and packages, and how to manage configs within those packages. We’re going to protect nginx, mainly because its pretty common, and also keeps it simple for those of us new to SaltStack (me included!)

SALTSTACK CHANGE MINION NAME SERIES

The final blog in this 4 part series is all about creating an automatic self-healing infrastructure, preventing accidental and malicious changes to your infrastructure using SaltStack Config.

Saltstack change minion name