19. API

Overview

Zabbix API allows you to programmatically retrieve and modify the configuration of Zabbix and provides access to historical data. It is widely used to:

• Create new applications to work with Zabbix;
• Integrate Zabbix with third-party software;
• Automate routine tasks.

The Zabbix API is a web based API and is shipped as part of the web frontend. It uses the JSON-RPC 2.0 protocol which means two things:

• The API consists of a set of separate methods;
• Requests and responses between the clients and the API are encoded using the JSON format.

More info about the protocol and JSON can be found in the JSON-RPC 2.0 specification and the JSON format homepage.

Structure

The API consists of a number of methods that are nominally grouped into separate APIs. Each of the methods performs one specific task. For example, the host.create method belongs to the host API and is used to create new hosts. Historically, APIs are sometimes referred to as "classes".

Performing requests

Once you've set up the frontend, you can use remote HTTP requests to call the API. To do that you need to send HTTP POST requests to the api_jsonrpc.php file located in the frontend directory. For example, if your Zabbix frontend is installed under http://example.com/zabbix, the HTTP request to call the apiinfo.version method may look like this:

POST http://example.com/zabbix/api_jsonrpc.php HTTP/1.1
       Content-Type: application/json-rpc
       
       {
           "jsonrpc": "2.0",
           "method": "apiinfo.version",
           "id": 1,
           "auth": null,
           "params": {}
       }

The request must have the Content-Type header set to one of these values: application/json-rpc, application/json or application/jsonrequest.

Example workflow

The following section will walk you through some usage examples in more detail.

Authentication

To access any data in Zabbix, you need to either:

• use an existing API token (created in Zabbix frontend or using the Token API);
• use an authentication token obtained with the user.login method.

For example, if you wanted to obtain a new authentication token by logging in as a standard Admin user, then a JSON request would look like this:

{
           "jsonrpc": "2.0",
           "method": "user.login",
           "params": {
               "username": "Admin",
               "password": "zabbix"
           },
           "id": 1,
           "auth": null
       }

Let's take a closer look at the request object. It has the following properties:

• jsonrpc - the version of the JSON-RPC protocol used by the API; the Zabbix API implements JSON-RPC version 2.0;
• method - the API method being called;
• params - parameters that will be passed to the API method;
• id - an arbitrary identifier of the request;
• auth - a user authentication token; since we don't have one yet, it's set to null.

If you provided the credentials correctly, the response returned by the API will contain the user authentication token:

{
           "jsonrpc": "2.0",
           "result": "0424bd59b807674191e7d77572075f33",
           "id": 1
       }

The response object in turn contains the following properties:

• jsonrpc - again, the version of the JSON-RPC protocol;
• result - the data returned by the method;
• id - identifier of the corresponding request.

Retrieving hosts

We now have a valid user authentication token that can be used to access the data in Zabbix. For example, let's use the host.get method to retrieve the IDs, host names and interfaces of all configured hosts:

{
           "jsonrpc": "2.0",
           "method": "host.get",
           "params": {
               "output": [
                   "hostid",
                   "host"
               ],
               "selectInterfaces": [
                   "interfaceid",
                   "ip"
               ]
           },
           "id": 2,
           "auth": "0424bd59b807674191e7d77572075f33"
       }

The response object will contain the requested data about the hosts:

{
           "jsonrpc": "2.0",
           "result": [
               {
                   "hostid": "10084",
                   "host": "Zabbix server",
                   "interfaces": [
                       {
                           "interfaceid": "1",
                           "ip": "127.0.0.1"
                       }
                   ]
               }
           ],
           "id": 2
       }

Creating a new item

Let's create a new item on "Zabbix server" using the data we've obtained from the previous host.get request. This can be done by using the item.create method:

{
           "jsonrpc": "2.0",
           "method": "item.create",
           "params": {
               "name": "Free disk space on /home/joe/",
               "key_": "vfs.fs.size[/home/joe/,free]",
               "hostid": "10084",
               "type": 0,
               "value_type": 3,
               "interfaceid": "1",
               "delay": 30
           },
           "auth": "0424bd59b807674191e7d77572075f33",
           "id": 3
       }

A successful response will contain the ID of the newly created item, which can be used to reference the item in the following requests:

{
           "jsonrpc": "2.0",
           "result": {
               "itemids": [
                   "24759"
               ]
           },
           "id": 3
       }

Creating multiple triggers

So if create methods accept arrays, we can add multiple triggers like so:

{
           "jsonrpc": "2.0",
           "method": "trigger.create",
           "params": [
               {
                   "description": "Processor load is too high on {HOST.NAME}",
                   "expression": "last(/Linux server/system.cpu.load[percpu,avg1])>5",
               },
               {
                   "description": "Too many processes on {HOST.NAME}",
                   "expression": "avg(/Linux server/proc.num[],5m)>300",
               }
           ],
           "auth": "0424bd59b807674191e7d77572075f33",
           "id": 4
       }

A successful response will contain the IDs of the newly created triggers:

{
           "jsonrpc": "2.0",
           "result": {
               "triggerids": [
                   "17369",
                   "17370"
               ]
           },
           "id": 4
       }

Updating an item

Enable an item, that is, set its status to "0":

{
           "jsonrpc": "2.0",
           "method": "item.update",
           "params": {
               "itemid": "10092",
               "status": 0
           },
           "auth": "0424bd59b807674191e7d77572075f33",
           "id": 5
       }

A successful response will contain the ID of the updated item:

{
           "jsonrpc": "2.0",
           "result": {
               "itemids": [
                   "10092"
               ]
           },
           "id": 5
       }

Updating multiple triggers

Enable multiple triggers, that is, set their status to 0:

{
           "jsonrpc": "2.0",
           "method": "trigger.update",
           "params": [
               {
                   "triggerid": "13938",
                   "status": 0
               },
               {
                   "triggerid": "13939",
                   "status": 0
               }
           ],
           "auth": "0424bd59b807674191e7d77572075f33",
           "id": 6
       }

A successful response will contain the IDs of the updated triggers:

{
           "jsonrpc": "2.0",
           "result": {
               "triggerids": [
                   "13938",
                   "13939"
               ]
           },
           "id": 6
       }

Error handling

Up to that point everything we've tried has worked fine. But what happens if we try to make an incorrect call to the API? Let's try to create another host by calling host.create but omitting the mandatory groups parameter.

{
           "jsonrpc": "2.0",
           "method": "host.create",
           "params": {
               "host": "Linux server",
               "interfaces": [
                   {
                       "type": 1,
                       "main": 1,
                       "useip": 1,
                       "ip": "192.168.3.1",
                       "dns": "",
                       "port": "10050"
                   }
               ]
           },
           "id": 7,
           "auth": "0424bd59b807674191e7d77572075f33"
       }

The response will then contain an error message:

{
           "jsonrpc": "2.0",
           "error": {
               "code": -32602,
               "message": "Invalid params.",
               "data": "No groups for host \"Linux server\"."
           },
           "id": 7
       }

If an error occurred, instead of the result property, the response object will contain an error property with the following data:

• code - an error code;
• message - a short error summary;
• data - a more detailed error message.

Errors can occur in different cases, such as, using incorrect input values, a session timeout or trying to access unexisting objects. Your application should be able to gracefully handle these kinds of errors.

API versions

To simplify API versioning, since Zabbix 2.0.4, the version of the API matches the version of Zabbix itself. You can use the apiinfo.version method to find out the version of the API you're working with. This can be useful for adjusting your application to use version-specific features.

We guarantee feature backward compatibility inside of a major version. When making backward incompatible changes between major releases, we usually leave the old features as deprecated in the next release, and only remove them in the release after that. Occasionally, we may remove features between major releases without providing any backward compatibility. It is important that you never rely on any deprecated features and migrate to newer alternatives as soon as possible.

Further reading

You now know enough to start working with the Zabbix API, but don't stop here. For further reading we suggest you have a look at the list of available APIs.