Issue with "host.update" in Zabbix API - templates_clear removes all templates

[Giacomo_Boria]

Hello,
I’m new to the forum, and I’d like to thank you in advance for your support.

On my Zabbix server (version 6.0 LTS), I need to modify several hosts to replace an existing template with a new/different one.

Given the large number of hosts and the need to make additional changes, I decided to use a Python script. I based my script on the official documentation, specifically this page:

https://www.zabbix.com/documentation/6.0/en/manual/api/reference/host/update

Problem:
When I execute the host.update request with the templates_clear parameter to unlink and clear a specific template, all templates associated with the host are removed, not just the one specified.

Here’s the code I’m using:

def remove_template(auth_result, hostid, templateid_to_change):
    auth_token = auth_result["result"]

    host_update = {
        "jsonrpc": "2.0",
        "method": "host.update",
        "params": {
            "hostid": hostid,
            "templates_clear": [
                {
                    "templateid": templateid_to_change
                }
            ]
        },
        "auth": auth_token,
        "id": 1
    }

    response = requests.post(zabbix_api_url, data=json.dumps(host_update), headers=headers, verify=False)
    create_result = response.json()

    return create_result
​

Question:
Has anyone encountered a similar issue? Am I using the API correctly, or am I missing something?

Thank you very much for your support!

[cyber]

Looks ok...

tested with following, removed only one specified template...

from zabbix_utils import ZabbixAPI
zapi = ZabbixAPI(url="your api url")
zapi.login(token="your access token (generate from UI)")

zapi.host.update(
    hostid=<insert your hosts id here>,
    templates_clear=[
        {
            "templateid": <insert your template id here>
        }
    ]
)

using native python library .. https://github.com/zabbix/python-zabbix-utils

[Giacomo_Boria]

Thanks for your response.

I tried the suggested solution, but unfortunately, the result is still the same: when I run the code, all templates associated with the host are cleared, not just the one specified.

Here is the updated code I’m using now:

def remove_template( hostid1, old_template):

api.host.update(
hostid=hostid1,
templates_clear=[
{
"templateid": old_template
}
]
)

Is this behavior expected? Or is it a bug in the API? If anyone has successfully managed to unlink a single template without affecting others, I’d greatly appreciate any insights.

Thanks again for your help!