How to Write a Check Example by Contributor ; Updated September 14, Writing a check is extremely easy, and if you're new to the game, or you just want to make sure that you're doing it right, I wanted to show you step by step on how it can be done.
Two further components are optional but strongly recommended: The data source Everything begins with the data source, i. Currently there are two different kinds of data sources: An agent section is a part of the output of an agent, for example the output of the Linux command df.
Both data sources are presented to the check function as a table a Python list of lists. We will call these data the "agent data".
The agent plugin If you write a TCP based check you need a plugin for the agent. This is a typically small executable script which is placed in the plugins directory of the agent. It uses standard operating system methods for retrieving the data of interest.
The inventory function If you want your check to support inventory which is always a good ideayou have to supply an inventory function.
This function examines the agent data of a host and creates a list of all items to be checked on this specific host. An item uniquely identifies a thing to be checked on a host within that type of check.
Some examples of items are: The check "services" uses the Windows service name as its item, for example "TnsListener".
The check "ps" uses an artificial user supplied item. The check "local" uses the service description as output by the local check.
Some checks do not need to distinguish items. This is because the thing they check does not exist more than once on a host.
An example is the check mem. Please note that this does not mean you cannot do an inventory on mem. It's just that the number of items the inventory returns is at most one. In some cases it is even zero: This is a very useful feature and enables the Nagios administrator to automatically perform the right checks on the right operating systems.
Your inventory function does not need to worry whether a certain item was already configured manually or detected by a previous inventory. The check function When an actual check of a host is done, all services for this host will be checked in turn. Your function will be provided with the checked item, the optional parameters of the check and the agent data.
The check function then extracts the information relevant for the item in question from the agent data decides on the Nagios status of the service creates one line of text output for Nagios optionally computes performance data returns status, line of text and performance data as a Python tuple This is very similar to what standard Nagios plugins do, with the important difference, that our check is already provided with data from the agent and does not have to retrieve it by itself.
The manual page If you want to pass your check along to others, a manual page for the check is strongly recommended. The PNP template If you check delivers performance data i.Hi – what’s the best way to write the following example when you’re trying to communicate an outage that will span across multiple days at different times.
For example: “As a result, access to email will be unavailable from a.m. ET on Saturday, November 3 until . For example, if it's "$", you will write "one hundred and 34/" There's no need to write dollars, or cents.
Always draw a line across the blank spot to stop thieves from altering your check. The blank line in the middle of the check is for you to write out the amount of dollars and cents in words, for example “One hundred thirty-five & 50/” The box to the right of this line is where you write the numerical value of payment, so in this case, "".
Introduction. A console application is the simplest form of C# program.
Console programs are very easy to develop. Console programs read input and write output. The following example was a very simple but real Pig Latin Script. Pig allows for developers to write complex Mapreduce jobs without having to write those scripts in Java.
Check out more examples of Pig Latin Scripts at the Hadoop Pig tag. In Java, FileOutputStream is a bytes stream class that’s used to handle raw binary data.
To write the data to file, you have to convert the data into bytes and save it to file. To write the data to file, you have to convert the data into bytes and save it to file.