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At this year’s FileMaker DevCon, Mislav Kos and I will present a session on Server Monitoring with Zabbix. There is good information in the FileMaker community being released around this topic, but most of it is about how to install Zabbix.
In this short preview, we want to fast forward a bit and showcase what the end result looks like. Specifically, we want to demonstrate how Zabbix can not only keep an eye on your FileMaker Server, show you its vitals, and send you notifications when things go wrong, but also how it can pro-actively step in and fix important issues.
For this article, we will show how Zabbix can restart the Data API process if it finds that it has stopped. The same logic can be applied to the other processes that make up all of FileMaker Server: the server-side scripting engine, the web publishing engine, the ODBC/JDBC process, etc…
When any of these components crash or stop, Zabbix can step in and take corrective action.
Zabbix works as follows:
- It collects data on items that you have defined. In the Zabbix template we will release with our DevCon presentation, we will have over 150 relevant items related to FileMaker Server’s health.
- For those items that you deem important, you define a trigger that evaluates the data for a particular item. Examples are: process running or not running, cache hit % below 95%, number of Remote Calls in Progress higher than 10, etc…
- When Zabbix finds that the data for an item matches one of your triggers, then a problem event is raised. Those problems and their duration are automatically tracked by Zabbix and are visible in the Zabbix dashboard.
- Additionally, you can have Zabbix take action. Most typically that would be to send out a notification by email or SMS. But it can also be to execute a command on the host machine where the problem has just happened.
One of the servers we track is a FileMaker Server 17 running on macOS. Using the macOS Activity Monitor we can see the various FileMaker Server processes including “fmwipd,” which is the Data API process.
There are a few different ways that we can track if it stops working; for instance, we could rely on the FileMaker Server event log where an event with ID 701 will be raised when FileMaker Server detects that its Data API has terminated abnormally. Zabbix can certainly (and easily) keep an eye on the event log.
But we will work with the operating system and use the OS tools to track the process. On Windows, we would do this by using the built-in Windows Perfmon and ask for the Thread Count on the process. If it is 0 or there is no data for that counter, then we would know that the process is not running.
But this is macOS, so we will just use the built-in “ps” command to get a list of the running processes and their state.
In our Zabbix template we have an item for just that purpose (note that it filters the output of the ‘ps’ command to just processes owned by ‘fmserver’):
This item will return a simple ‘1’ if the process is running and ‘0’ if it is not.
As you can tell from the screenshot, we have a trigger defined for the item to raise a ‘Disaster’ problem when the last value returned for the item is ‘0’. We check this every 30 seconds.
At this point, the problem visibility is limited to the Zabbix dashboard. We need an action to be notified automatically and for Zabbix to take action:
We have configured the action to do two things: email us immediately to make us aware of the problem and also immediately try to restart the Data API through the FileMaker Server admin command line:
fmsadmin restart fmdapi
What happens if we simulate a Data API crash? From the macOS activity monitor, we force quit the Data API process:
When we turn to Zabbix and look at the data for the Data API item, we see that it was showing ‘1’ (aka ‘running just fine’), then dipped to ‘0’ (aka ‘not running) and fairly immediately went back to the running state:
A quick look at our FileMaker Server shows that the process has indeed returned. Note that it has a different process ID (PID) than it had before, an indication that the process has restarted.
In Zabbix the problem event was updated to ‘RESOLVED’, and we can see the actions that Zabbix took and how fast it did it:
- At 8:53 and 47 seconds it caught the problem.
- One second later it executed the command.
- 30 seconds later (the next data collection interval for the item), it determined that the process was running and the problem was closed.
There is a lot more power to these Zabbix triggers and actions than what we are showing here, including escalation procedures, but we hope that this shows how Zabbix can give us both monitoring and healing capabilities over and beyond anything that we ever had with just the FileMaker Server Admin Console.
There are considerations to make to allow Zabbix to execute commands on your FileMaker Server, which we will discuss at DevCon, but the functionality is there, ready to be used. We hope that all of this intrigues you enough to attend the session but more importantly to consider adding Zabbix to your toolbelt and fortify your FileMaker Server deployments.
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