Max parallel HTTP connections in a browser to a single website/domain

Untuk Firefox

1. Di address bar firefox ketik about:config

2. Lihat config : network.http.max-connections-per-server dan network.http.max-persistent-connections-per-server  lihat nilainya, bisa dinaikkan sesuai kebutuhan

how to configure maximum number of connections that it will accept from a single client in nginx

Berikut jawaban ChatGPT, jawaban ini perlu divalidasi : 

To configure the maximum number of connections that nginx will accept from a single client, you can use the max_conns directive in the http or server block of your nginx configuration file. For example, to limit the number of connections to 100 for a specific server, you could use the following configuration:

http {

    ...

    server {

        ...

        max_conns 100;

        ...

    }

}

Keep in mind that this directive only applies to connections from individual clients, and not to the total number of connections that nginx will accept. To limit the total number of connections that nginx will accept, you can use the worker_connections directive in the events block of your configuration file. For example:

http {

    ...

    events {

        ...

        worker_connections 1024;

        ...

    }

    ...

}

This will allow nginx to accept a maximum of 1024 connections in total. You can adjust this value as needed to suit your specific requirements.

Please note that this is just an example configuration, and you should adjust the values to suit your specific needs and environment. It is also recommended to consult the nginx documentation for more information on configuring nginx and its various options.

Referensi

1. Max parallel HTTP connections in a browser?, https://stackoverflow.com/questions/985431/max-parallel-http-connections-in-a-browser

Mengganti seluruh teks yang ada di luar tag.

 Misalkan kita memiliki teks seperti berikut : 

Nusantara_berdikari : [latex]\begin{aligned} \mathrm{Population_t} &= \alpha_1 + \gamma_1 X_{1,t} + \gamma_2 X_{1,t-1} \\ \mathrm{Price_t} &= \alpha_2 + \beta_1 Z_{1,t} \end{aligned}[/latex] Nusantara_sejahtera

Bagaimana mengganti semua "_" menjadi "\_" kecuali yg berada di dalam tag [latex][/latex] ? 

Salah satu solusi dari [1] :

/**

* @param string $text

* @param array $str_to_replace

* @param string $str_replace_with

*/

public static function replaceTextOutsideTags($text = null, $str_to_replace = [], $str_replace_with = ''){

$p = implode('|', array_map('preg_quote', $str_to_replace));

$result = preg_replace("#\[latex\].*?\[\/latex\](*SKIP)(*FAIL)|($p)#i", $str_replace_with, $text);

return $result ;

}

Referensi

1. preg_replace keywords OUTSIDE of <strong> tags, https://stackoverflow.com/questions/30724791/preg-replace-keywords-outside-of-strong-tags

Dashboard Monitoring Apache Server, php-fpm & MySQL

 mod_status

/etc/apache2/sites-available/status.conf

Listen 8181

<VirtualHost *:8181>

    ServerName my-domain-name.id

    ErrorLog /var/log/apache2/status_error.log

    CustomLog /var/log/apache2/status_access.log common

    <Location /server-status>

        SetHandler server-status

        Require all granted

    </Location>

</VirtualHost>

apache Exporter untuk Prometheus (Lusitaniae)

 /etc/systemd/system/apache_exporter.service

[Unit]

Description=Prometheus

Documentation=https://github.com/Lusitaniae/apache_exporter

Wants=network-online.target

After=network-online.target

[Service]

Type=simple

User=prometheus

Group=prometheus

ExecReload=/bin/kill -HUP $MAINPID

ExecStart=/usr/local/bin/apache_exporter \

  --insecure \

  --scrape_uri=http://localhost:8181/server-status/?auto \

  --telemetry.address=0.0.0.0:9117 \

  --telemetry.endpoint=/metrics

SyslogIdentifier=apache_exporter

Restart=always

[Install]

WantedBy=multi-user.target

1. php-fpm Exporter untuk Prometheus (Lusitaniae)

/etc/php/7.2/fpm/pool.d/www.conf

pm.status_path = /status-phpfpm72

sudo apt install golang-go

git clone https://github.com/Lusitaniae/phpfpm_exporter.git

cd phpfpm_exporter

make build

/etc/systemd/system/php-fpm_exporter.service

[Unit]

Description = PHP-FPM Prometheus Exporter

Documentation=https://github.com/Lusitaniae/phpfpm_exporter

Wants=network-online.target

After=network-online.target

[Service]

ExecReload=/bin/kill -HUP $MAINPID

SyslogIdentifier = phpfpm_exporter

ExecStart = /opt/phpfpm_exporter/phpfpm_exporter \

   --phpfpm.socket-paths /var/run/php/php7.2-fpm.sock \

   --phpfpm.status-path="/status-phpfpm72"

   --phpfpm.script-collector-paths /usr/local/bin/php_exporter/phpfpm_opcache_exporter.php

[Install]

WantedBy = multi-user.target

systemctl daemon-reload

systemctl enable --now php-fpm_exporter

systemctl status php-fpm_exporter

 

2. php-fpm Exporter untuk Prometheus (hipages)

Dapat juga menggunakan exporter berikut : https://github.com/hipages/php-fpm_exporter

 

nano /etc/systemd/system/php-fpm_exporter.service

[Unit]
Description = PHP-FPM Prometheus Exporter
Documentation=https://github.com/Lusitaniae/phpfpm_exporter
Wants=network-online.target
After=network-online.target


[Service]
ExecReload=/bin/kill -HUP $MAINPID
SyslogIdentifier = phpfpm_exporter

ExecStart = /usr/local/bin/phpfpm_exporter/php-fpm_exporter_2.2.0_linux_amd64 server --web.listen-address 127.0.0.1:9253 --phpfpm.scrape-uri tcp://127.0.0.1:9000/status  --phpfpm.fix-process-count true

[Install]
WantedBy = multi-user.target

MySQL

[9][10]. Untuk Grafana dashboard, dapat menggunakan id 6239

Prometheus

Install dan mengamankan prometheus yang secara default dapat diakses tanpa password di port 9090, baca [6].

/etc/prometheus/prometheus.yml

# my global config

global:

  scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.

  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.

  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration

alerting:

  alertmanagers:

    - static_configs:

        - targets:

          # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.

rule_files:

  # - "first_rules.yml"

  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:

# Here it's Prometheus itself.

scrape_configs:

  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.

  - job_name: "prometheus"

    # metrics_path defaults to '/metrics'

    # scheme defaults to 'http'.

    static_configs:

      - targets: ["localhost:9090"]

  # Apache Servers

  - job_name: "apache"

    static_configs:

      - targets: ["localhost:9117"]

  # php-fpm

  - job_name: "php-fpm7.2"

    static_configs:

      - targets: ["localhost:9253"]

Referensi

1. Apache Exporter for Prometheus, https://github.com/Lusitaniae/apache_exporter
2. Install Prometheus on Debian 10, https://kifarunix.com/install-prometheus-on-debian-10/
3. Monitor Apache Web Server with Prometheus and Grafana in 5 minutes, https://computingforgeeks.com/how-to-monitor-apache-web-server-with-prometheus-and-grafana-in-5-minutes/
4. Grafana support for prometheus, https://prometheus.io/docs/visualization/grafana/
5. PHP-FPM Exporter for Prometheus, https://github.com/Lusitaniae/phpfpm_exporter
6. Securing Prometheus API and UI endpoints using basic auth, https://prometheus.io/docs/guides/basic-auth/
7. Real-time PHP-FPM Status, https://gist.github.com/Jiab77/a9428050ab9bb3f17c5e33343da94fd8
8. Prometheus Server and TLS, https://inuits.eu/blog/prometheus-server-tls/
9. How to Monitor MySQL Deployments with Prometheus & Grafana at ScaleGrid, https://scalegrid.io/blog/how-to-monitor-mysql-deployments-with-prometheus-and-grafana-at-scalegrid/
10. MySQL Server Exporter, https://github.com/prometheus/mysqld_exporter

Composer : A Dependency Manager for PHP

 ...

Referensi

1. Composer : A Dependency Manager for PHP, https://getcomposer.org
2. Introducing graph visualization of composer package dependencies, https://clue.engineering/2020/introducing-graph-composer

phpDocumentor

Agar classes graph dapat digenerate tambahkan opsi : --setting=graphs.enabled=true lalu jangan lupa install graphviz dan plantuml.

OAuth 2.0 Server

 ...

Referensi

1. OAuth 2.0 Server PHP, https://bshaffer.github.io/oauth2-server-php-docs/

Psalm : free & open-source static analysis tool

 ...

Referensi

1. Psalm, https://psalm.dev/
2. It’s not legacy code — it’s PHP, https://medium.com/vimeo-engineering-blog/its-not-legacy-code-it-s-php-1f0ee0462580