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README.md

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+### Zabbix Template Module SSL version 1.0.0
+
+Tested on Zabbix 7.0
+Tested on Zabbix 6.0
+Tested on Zabbix 4.4
+
+# Introduction
+Template for Zabbix to check SSL expiration using external script.
+It can check:
+* days left until expire
+* if SSL certificate can be read
+
+# Requirement
+The script use the commands **openssl** so it requires the Linux package **openssl**
+
+To install it you can use the package manager of your distribution
+
+Exemple
+```bash
+apt-get install openssl
+```
+By the way you may require sudoer rights to run the command.
+
+# Installation
+
+## Content
+The template installation require 2 files:
+* **frogg_ssl_check.sh** Zabbix external script
+* **frogg_ssl_check.json** Zabbix template configuration
+
+## External script
+
+You need to place the script **frogg_ssl_check.sh** into zabbix external forlder **externalscripts/frogg_ssl_check** (by default in **/usr/lib/zabbix/externalscripts/frogg_ssl_check**)
+
+You can find the external script folder in Zabbix configuration file **zabbix_server.conf** (by default in **/etc/zabbix/zabbix_server.conf**)
+
+You will need to add execute permission on the script
+```bash
+chmod +x frogg_ssl_check.sh 
+```
+
+### Testing the installation
+You can run the command:
+- To Test SSL certificate
+```bash
+./frogg_ssl_check.sh -a=exist -s=frogg.fr -p=443
+```
+- To get day left of ssl certificate
+```bash
+./frogg_ssl_check.sh -a=expire -s=frogg.fr -p=443
+```
+## Template
+
+Then you need to import the **frogg_ssl_check.xml** template configuration file in the Zabbix web interface in **Template** tab using the import button
+
+# Host configuration
+The template use 5 macros :
+
+| MACRO       | Description                                       | Default  |
+|-------------|---------------------------------------------------|----------|
+| {$SSL.DNS}  | web server DNS name                               |          |
+| {$SSL.PORT} | server web ssl port                               | port 443 |
+| {$SSL.INFO} | number of days left before triggering information | 60 days  |
+| {$SSL.WARN} | number of days left before triggering warning     | 30 days  |
+| {$SSL.AVG}  | number of days left before triggering average     | 10 days  |
+
+# Template items
+![Zabbix SSL Template](https://tool.frogg.fr/upload/github/zabbix-ssl/items.png)
+
+# Template triggers
+![Zabbix SSL Template triggers](https://tool.frogg.fr/upload/github/zabbix-ssl/triggers.png)
+
+# Debugging
+
+Going further...This step is working with most of the externals scripts
+
+If you got troubles getting an external script working, first :
+1. Check the Zabbix tab **Monitoring > lastest data**
+   If you select a host, you should see all items linked to it, check for your item, and you should see the lasted data linked to it.
+   If it appears in gray (disabled) that mean there is something wrong with the external script (rights, path, arguments ...)
+   To find more about it, you can check logs
+2. By default, the logs are in **/var/log/zabbix/zabbix_server.log**, or you can find the log path in Zabbix configuration file **zabbix_server.conf** (by default **/etc/zabbix/zabbix_server.conf**)
+
+To get the last log lines you can use for example:
+```bash
+tail -f /var/log/zabbix/zabbix_server.log
+```
+Then look at the script trouble...
+
+Example:
+![Zabbix NFS error sample](https://tool.frogg.fr/upload/github/zabbix-nfs/error.png)
+In this case Zabbix cannot find the path of the script as you can see *no such file or directory*