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jonathancraddock / Cachet-Config

Some notes on a prototype dashboard using the open-source project, "Cachet".

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Notes on Cachet Config

Official Project Page: Cachet

Contents
Installing On Ubuntu 20
Page Design
API Examples
API NodeRED
Timezone
References

Installing on Ubuntu 20

I don't see many people complaining about the installation instructions, so maybe it's just me, but I tried multiple times with the official instructions, and with guides on various blog posts, and then tried the Docker version. Basically nothing worked as expected. However, the guide on https://websiteforstudents.com/install-cachet-status-platform-on-ubuntu-16-04-18-04-with-apache2-mariadb-and-php-7-2/ does appear to work ok, and I've summarised my steps below.

Started with a clean Ubuntu 20 LTS install. I created a single sudo user and ran the usual updates. Took a snapshot here, in case I needed to revert the setup, again!

There's a useful guide here: https://www.digitalocean.com/community/tutorials/how-to-install-the-apache-web-server-on-ubuntu-20-04 and do remember to enable the services (Apache and MariaDB) as you presumably want them to auto start after a reboot.

Apache

sudo apt update
sudo apt install apache2
curl localhost

^- the default Apache page should be served

Git and cURL

They are probably already installed, but just in case:

sudo apt install curl git

MariaDB

sudo apt-get install mariadb-server mariadb-client
sudo mysql_secure_installation

Secure the database as you wish.

sudo mysql -u root -p
exit;

^- confirm you can login

PHP

There is a variety of conflicting advice around PHP versions. I tried 7.2, as per this guide, and it appears to work ok.

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt update
sudo apt install php7.2 libapache2-mod-php7.2 php7.2-common php7.2-mysql php7.2-gmp php7.2-curl php7.2-intl php7.2-mbstring php7.2-xmlrpc php7.2-gd php7.2-bcmath php7.2-imap php7.2-xml php7.2-cli php7.2-zip

Made the following suggested edits sudo nano /etc/php/7.2/apache2/php.ini.

file_uploads = On
allow_url_fopen = On
short_open_tag = On
memory_limit = 256M
upload_max_filesize = 100M
max_execution_time = 360
date.timezone = Europe/London

Restart Apache and (if you want to) confirm that PHP is ok.

sudo systemctl restart apache2
sudo nano /var/www/html/phpinfo.php

Add <?php phpinfo( ); ?> to the top of the file and curl localhost/phpinfo.php. It should be served as html.

Create the Database

sudo mysql -u root -p
CREATE DATABASE cachetdb;
CREATE USER 'cachetdbuser'@'localhost' IDENTIFIED BY '****';
GRANT ALL ON cachetdb.* TO 'cachetdbuser'@'localhost' IDENTIFIED BY '****' WITH GRANT OPTION;
FLUSH PRIVILEGES;
EXIT;

Cachet App

curl -sS https://getcomposer.org/installer | sudo php -- --install-dir=/usr/local/bin --filename=composer
cd /var/www/html
sudo git clone -b 2.4 --single-branch https://github.com/cachethq/Cachet.git cachet
sudo cp /var/www/html/cachet/.env.example /var/www/html/cachet/.env

^- I'd normally install higher than the default html folder, but after all the preceeding hassle I was following their guide exactly...

Edit the env file, sudo nano /var/www/html/cachet/.env.

DB_HOST=localhost
DB_DATABASE=cachetdb
DB_USERNAME=cachetdbuser
DB_PASSWORD=****

I believe it's bad practice to run Composer with sudo, there may be a warning? I accepted it with a 'Y'.

cd /var/www/html/cachet
sudo composer install --no-dev -o

Answer "no" to the two prompts on the Cachet install.

sudo php artisan key:generate
sudo php artisan cachet:install

^- if you want to check, the key should now be written into the .env file.

Reset ownerships and permissions.

sudo chown -R www-data:www-data /var/www/html/cachet/
sudo chmod -R 755 /var/www/html/cachet/

^- Surely this is far too generous?! These were recommended by the install guide, but in production I'd question this owenership, and I think only the cache and storage folders need to be writable. Possibly also database, if you're using sqlite.

Apache Conf

Create a conf file.

sudo nano /etc/apache2/sites-available/cachet.conf

Their suggestion:

<VirtualHost *:80>
     ServerAdmin cachet@example.com
     DocumentRoot /var/www/html/cachet/public
     ServerName cachet.example.com
     ServerAlias cachet.example.com

     <Directory /var/www/html/cachet/public>
          Options FollowSymlinks
          AllowOverride All
          Require all granted
     </Directory>

     ErrorLog ${APACHE_LOG_DIR}/error.log
     CustomLog ${APACHE_LOG_DIR}/access.log combined

     <Directory /var/www/html/cachet/public>
            RewriteEngine on
            RewriteBase /
            RewriteCond %{REQUEST_FILENAME} !-f
            RewriteRule ^(.*) index.php [PT,L]
    </Directory>
</VirtualHost>

Enable the site.

sudo a2ensite cachet.conf
sudo a2enmod rewrite
sudo systemctl restart apache2

Let's Encrypt

And secure the site.

sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot
sudo certbot --apache

In Browser Config

You should now be able to complete the setup in your browser.

Cache Driver - database
Queue Driver - none
Session Driver - database

^- the following driver selection works, but may not be optimal?

Page Design

The file /var/www/cachet/resources/views/index.blade.php contains the Laravel blade template for the main page layout. For example, if you need the page sections to appear in a different order.

@extends('layout.master')

@section('content')
@include('partials.modules.messages')
@include('partials.modules.status')
@include('partials.about-app')
@include('partials.modules.components')
@include('partials.modules.metrics')
@include('partials.modules.stickied')
@include('partials.modules.scheduled')
@include('partials.modules.timeline')
@stop

@section('bottom-content')
@include('partials.footer')
@stop

^- eg/ if you wanted the "about" panel to display above the "status" message, etc.

Highlight the "Maintenance" section:

.section-scheduled {
  border: 1px solid #3929a8;
  border-radius: 4px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

API Examples

Update status of a component:

curl -X PUT -H "Content-Type: application/json" -H "X-Cachet-Token: API-KEY-HERE" -d '{"status":1}' "https://cachet.example.com/api/v1/components/1"

^- in this example, set component 1 to status of 'operational'

Components:

  • /api/v1/components list all components
  • /api/v1/components/1 query specific component
  • /api/v1/components/groups list all component groups
  • /api/v1/components/groups/1 components in specified group

Component fields?

"id": 1,
"name": "Component Name",
"description": "Description goes here",
"link": "",
"status": 1,
"order": 0,
"group_id": 1,
"enabled": true,
"meta": null,
"created_at": "2021-07-29 18:51:27",
"updated_at": "2021-08-03 12:19:47",
"deleted_at": null,
"status_name": "Operational",
"tags": []

Group fields?

"id": 1,
"name": "Group Name",
"order": 0,
"visible": 1,
"collapsed": 0,
"created_at": "2021-07-29 18:58:49",
"updated_at": "2021-07-30 15:57:42",
"enabled_components": [],
"lowest_human_status": "Operational"

Incidents:

  • /api/v1/incidents list all incidents
  • /api/v1/incidents/1 query specific incident
  • /api/v1/incidents/1/updates list updates on specified incident
  • /api/v1/incidents/1/updates/1 query specific update on specified incident

Metrics

  • /api/v1/metrics list all metrics
  • /api/v1/metrics/1 query a specific metric

If you make a POST request to https://cachet.example.com/api/v1/metrics/1/points supplying the API key and the data {"value":75} (for example) you're able to successfully log the data-point, but there appears to be an issue with UTC vs BST.

Maintenance:

  • (Don't know if this can be queried via their API?)

General:

  • /api/v1/version replies with version number
  • /api/v1/ping replies with "pong"
  • api/v1/subscribers (requires authentication)

API NodeRED

Proof of concept

Testing a simple flow, with four nodes.

  • Inject
  • Function
  • HTTP Request
  • Debug

The function can be used to set the URL, the two required headers, and the data object should be written to msg.payload.

msg.url = "https://cachet.example.com/api/v1/components/1";

msg.payload = {};
msg.payload = {"status":1};

msg.headers = {};
msg.headers['Content-Type'] = 'application/json';
msg.headers['X-Cachet-Token'] = 'API-KEY-HERE';

return msg;

Set the HTTP Request node to PUT and to return a Parsed JSON Object. In this example, the status of component 1 becomes set to operational.

Timezone

Some notes on diagnosing Cachet timezone graph display issue.

Regardless of timezone, the graph insists on displaying in UTC, rather than BST. If you change your timezone to Australia, the display of the graph shifts forward half a day, as you'd expect, but events are always shown as UTC. (Surely most 'end-users' want to see something more meaningful?)

Use timezonectl or check /etc/timezone.

timedatectl

               Local time: Tue 2021-08-10 10:12:34 UTC
           Universal time: Tue 2021-08-10 10:12:34 UTC
                 RTC time: Tue 2021-08-10 10:12:35
                Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

List available timezones with timedatectl list-timezones. In this case, I should be in the Europe/London timezone.

sudo timedatectl set-timezone Europe/London

With this change alone, data-points still being logged 1 hour out; UTC, not BST.

Looking at MariaDB.

sudo mysql -u root -p
Select now();

^- responds with UTC time

MariaDB [(none)]> show global variables like 'time_zone';
+---------------+--------+
| Variable_name | Value  |
+---------------+--------+
| time_zone     | SYSTEM |
+---------------+--------+
1 row in set (0.004 sec)

Set to SYSTEM so maybe just needs a restart?

sudo systemctl restart mariadb
sudo mysql -u root -p
Select now();

^- responds with BST

This represents an improvement. Now (for example) the URL https://cachet.example.com/api/v1/metrics/2/points reponds with data-points that have the correct timestamps. But, on the Cachet dashboard page, the graph still draws the points as if it were using UTC time.

In the .env the value APP_TIMEZONE is set to UTC. ALtering this to Europe/London seemed logical, but appears to prevent any new data-points from being logged. Setting it to BST allows data to be logged again, but the graph still displays them as UTC. Same with Etc/GMT+1.

APP_TIMEZONE=UTC

The customisation settings within the Cachet dashboard are showing "London" with the correct (BST) time being shown, but this setting doesn't affect the display of the points on the graph.

I can't see any clean solution to this for now. There's a certain logic to UTC time and maybe it's "by design", but personally I think it feels like a bit of an oversight?

^- it would appear that no data was received after 8am?

{"id":45,"metric_id":2,"value":41,"counter":1,"created_at":"2021-08-13 08:33:30","updated_at":"2021-08-13 08:33:21","calculated_value":41}

^- but the latest datapoint was sent at 8:33am

In summary, the points are correct. The last few values I sent (I'm POST'ing a random %'age value every hour) are 41, 82, 93, 29... you can see them correctly on the graph, but everything is offset by an hour.

References

A Working Installation Guide

CachetHQ

API

Let's Encrypt

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Some notes on a prototype dashboard using the open-source project, "Cachet".

phpapacheubuntucachetdashboardstatus-pagecss

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