# Pointers to implementing a new Tag-Historian for Apache IoTDB?

**URL:** <https://forum.inductiveautomation.com/t/pointers-to-implementing-a-new-tag-historian-for-apache-iotdb/85278>\
**Category:** Module Development\
**Created:** [February 6, 2024, 8:21am UTC](https://forum.inductiveautomation.com/t/pointers-to-implementing-a-new-tag-historian-for-apache-iotdb/85278 "2024-02-06T08:21:04Z")\
**Posts on this page:** 1\
**Showing post:** 10

<div class="post-metadata">

**Author:** ![mazeyrat](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mazeyrat/32/10955_2.png) [@mazeyrat](https://forum.inductiveautomation.com/u/mazeyrat)\
**Post date:** [February 7, 2024, 7:13pm UTC](https://forum.inductiveautomation.com/t/pointers-to-implementing-a-new-tag-historian-for-apache-iotdb/85278/10 "2024-02-07T19:13:04Z")

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You have to build the module-signer from here:

> **[GitHub - inductiveautomation/module-signer: A utility that signs modules for...](https://github.com/inductiveautomation/module-signer)**
>
> A utility that signs modules for use in Ignition. Contribute to inductiveautomation/module-signer development by creating an account on GitHub.

perhaps a post relative to your issue:

> [@Self signed module not loading](https://forum.inductiveautomation.com/t/self-signed-module-not-loading/79678):
>
> I've tried to follow the module signing instructions here: [https://docs.inductiveautomation.com/display/SE/Module+Signing](https://docs.inductiveautomation.com/display/SE/Module+Signing) and, along with help some other resources, managed to get my module signed but it won't load on a system that is not in developer mode. Certificate for module REST-Alarm-Notification-signed.modl not trusted I'm wanting to use a self signed module for internal use as described in the docs: Modules can be signed using either a real code signing certificate obtained from a…

For dev and test purpose you can **allow unsigned modules** on your gateway:

[https://docs.inductiveautomation.com/display/DOC81/Gateway+and+Gateway+Network+Parameters#GatewayandGatewayNetworkParameters-LoadingUnsignedModules-DeveloperMode](https://docs.inductiveautomation.com/display/DOC81/Gateway+and+Gateway+Network+Parameters#GatewayandGatewayNetworkParameters-LoadingUnsignedModules-DeveloperMode)

Ignition.conf

```auto
wrapper.java.additional.1=-Dignition.allowunsignedmodules=true

```

and restart ignition service

**As a side note:  
It's better to open a new post for a new subject (and to tag it).  
You will have much more response 🙂 !**

To sign your module at the end of the build with maven you can add something like:

```auto
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>1.5.0</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>exec</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <executable>${java.home}/bin/java</executable>
                    <arguments>
                        <argument>-jar</argument>
                        <jar>${signer-jar}</jar>
                        <argument>-keystore=${signer-export-certif}</argument>
                        <argument>-keystore-pwd=${signer-pwd}</argument>
                        <argument>-alias=byes-siai</argument>
                        <argument>-alias-pwd=${signer-pwd}</argument>
                        <argument>-chain=${signer-certif}</argument>
                        <argument>-module-in=${signer-in_module}</argument>
                        <argument>-module-out=${signer-out_module}</argument>
                    </arguments>
                </configuration>
            </plugin>

```

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