446 lines
20 KiB
Markdown
446 lines
20 KiB
Markdown
# Server configuration
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## Requirements
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### Operating system and web server
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Shaarli can be hosted on dedicated/virtual servers, or shared hosting.
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You need write access to the Shaarli installation directory - you should have received instructions from your hosting provider on how to connect to the server using SSH (or FTP for shared hosts).
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Examples in this documentation are given for [Debian](https://www.debian.org/), a GNU/Linux distribution widely used in server environments. Please adapt them to your specific Linux distribution.
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A $5/month VPS (1 CPU, 1 GiB RAM and 25 GiB SSD) will run any Shaarli installation without problems. Some hosting providers: [DigitalOcean](https://www.digitalocean.com/) ([1](https://www.digitalocean.com/docs/droplets/overview/), [2](https://www.digitalocean.com/pricing/), [3](https://www.digitalocean.com/docs/droplets/how-to/create/), [4](https://www.digitalocean.com/docs/droplets/how-to/add-ssh-keys/), [5](https://www.digitalocean.com/community/tutorials/initial-server-setup-with-debian-8), [6](https://www.digitalocean.com/community/tutorials/an-introduction-to-securing-your-linux-vps)), [Gandi](https://www.gandi.net/en), [OVH](https://www.ovh.co.uk/), [RackSpace](https://www.rackspace.com/), etc.
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### Network and domain name
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Try to host the server in a region that is geographically close to your users.
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A **domain name** ([DNS record](https://opensource.com/article/17/4/introduction-domain-name-system-dns)) pointing to the server's public IP address is required to obtain a SSL/TLS certificate and setup HTTPS to secure client traffic to your Shaarli instance.
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You can obtain a domain name from a [registrar](https://en.wikipedia.org/wiki/Domain_name_registrar) ([1](https://www.ovh.co.uk/domains), [2](https://www.gandi.net/en/domain)), or from free subdomain providers ([1](https://freedns.afraid.org/)). If you don't have a domain name, please set up a private domain name ([FQDN](ttps://en.wikipedia.org/wiki/Fully_qualified_domain_name)) in your clients' [hosts files](https://en.wikipedia.org/wiki/Hosts_(file)) to access the server (direct access by IP address can result in unexpected behavior).
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Setup a **firewall** (using `iptables`, [ufw](https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-debian-10), [fireHOL](https://firehol.org/) or any frontend of your choice) to deny all incoming traffic except `tcp/80` and `tcp/443`, which are needed to access the web server (and any other posrts you might need, like SSH). If the server is in a private network behind a NAT, ensure these **ports are forwarded** to the server.
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Shaarli makes outbound HTTP/HTTPS connections to websites you bookmark to fetch page information (title, thumbnails), the server must then have access to the Internet as well, and a working DNS resolver.
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### Screencast
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Here is a screencast of the installation procedure
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[](https://asciinema.org/a/z3RXxcJIRgWk0jM2ws6EnUFgO)
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--------------------------------------------------------------------------------
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### PHP
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Supported PHP versions:
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Version | Status | Shaarli compatibility
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:---:|:---:|:---:
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7.3 | Supported | Yes
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7.2 | Supported | Yes
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7.1 | Supported | Yes
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7.0 | EOL: 2018-12-03 | Yes (up to Shaarli 0.10.x)
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5.6 | EOL: 2018-12-31 | Yes (up to Shaarli 0.10.x)
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5.5 | EOL: 2016-07-10 | Yes
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5.4 | EOL: 2015-09-14 | Yes (up to Shaarli 0.8.x)
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5.3 | EOL: 2014-08-14 | Yes (up to Shaarli 0.8.x)
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Required PHP extensions:
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Extension | Required? | Usage
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[`openssl`](http://php.net/manual/en/book.openssl.php) | requires | OpenSSL, HTTPS
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[`php-json`](http://php.net/manual/en/book.json.php) | required | configuration parsing
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[`php-simplexml`](https://www.php.net/manual/en/book.simplexml.php) | required | REST API (Slim framework)
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[`php-mbstring`](http://php.net/manual/en/book.mbstring.php) | CentOS, Fedora, RHEL, Windows, some hosting providers | multibyte (Unicode) string support
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[`php-gd`](http://php.net/manual/en/book.image.php) | optional | required to use thumbnails
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[`php-intl`](http://php.net/manual/en/book.intl.php) | optional | localized text sorting (e.g. `e->è->f`)
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[`php-curl`](http://php.net/manual/en/book.curl.php) | optional | using cURL for fetching webpages and thumbnails in a more robust way
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[`php-gettext`](http://php.net/manual/en/book.gettext.php) | optional | Use the translation system in gettext mode (faster)
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Some [plugins](Plugins.md) may require additional configuration.
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- [PHP: Supported versions](http://php.net/supported-versions.php)
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- [PHP: Unsupported versions (EOL/End-of-life)](http://php.net/eol.php)
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- [PHP 7 Changelog](http://php.net/ChangeLog-7.php)
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- [PHP 5 Changelog](http://php.net/ChangeLog-5.php)
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- [PHP: Bugs](https://bugs.php.net/)
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## SSL/TLS (HTTPS)
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We recommend setting up [HTTPS](https://en.wikipedia.org/wiki/HTTPS) (SSL/[TLS](https://en.wikipedia.org/wiki/Transport_Layer_Security)) on your webserver for secure communication between clients and the server.
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### Let's Encrypt
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For public-facing web servers this can be done using free SSL/TLS certificates from [Let's Encrypt](https://en.wikipedia.org/wiki/Let's_Encrypt), a non-profit certificate authority provididing free certificates.
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- [How to secure Apache with Let's Encrypt](https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-debian-10)
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- [How to secure Nginx with Let's Encrypt](https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-debian-10)
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- [How To Use Certbot Standalone Mode to Retrieve Let's Encrypt SSL Certificates](https://www.digitalocean.com/community/tutorials/how-to-use-certbot-standalone-mode-to-retrieve-let-s-encrypt-ssl-certificates-on-debian-10).
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In short:
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```bash
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# install certbot
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sudo apt install certbot
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# stop your webserver if you already have one running
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# certbot in standalone mode needs to bind to port 80 (only needed on initial generation)
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sudo systemctl stop apache2
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sudo systemctl stop nginx
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# generate initial certificates
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# Let's Encrypt ACME servers must be able to access your server! port forwarding and firewall must be properly configured
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sudo certbot certonly --standalone --noninteractive --agree-tos --email "admin@shaarli.mydomain.org" -d shaarli.mydomain.org
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# this will generate a private key and certificate at /etc/letsencrypt/live/shaarli.mydomain.org/{privkey,fullchain}.pem
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# restart the web server
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sudo systemctl start apache2
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sudo systemctl start nginx
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```
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On apache `2.4.43+`, you can also delegate LE certificate management to [mod_md](https://httpd.apache.org/docs/2.4/mod/mod_md.html) [[1](https://www.cyberciti.biz/faq/how-to-secure-apache-with-mod_md-lets-encrypt-on-ubuntu-20-04-lts/)] in which case you don't need certbot and manual SSL configuration in virtualhosts.
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### Self-signed
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If you don't want to rely on a certificate authority, or the server can only be accessed from your own network, you can also generate self-signed certificates. Not that this will generate security warnings in web browsers/clients trying to access Shaarli:
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- [How To Create a Self-Signed SSL Certificate for Apache](https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-apache-on-debian-10)
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- [How To Create a Self-Signed SSL Certificate for Nginx](https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-nginx-on-debian-10)
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- [How to Create Self-Signed SSL Certificates with OpenSSL](http://www.xenocafe.com/tutorials/linux/centos/openssl/self_signed_certificates/index.php)
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- [How do I create my own Certificate Authority?](https://workaround.org/certificate-authority)
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--------------------------------------------------------------------------------
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## Examples
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The following examples assume a Debian-based operating system is installed. On other distributions you may have to adapt details such as package installation procedures, configuration file locations, and webserver username/group (`www-data` or `httpd` are common values). In these examples we assume the document root for your web server/virtualhost is at `/var/www/shaarli.mydomain.org/`:
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```bash
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# create the document root (replace with your own domain name)
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sudo mkdir -p /var/www/shaarli.mydomain.org/
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```
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You can install Shaarli at the root of your virtualhost, or in a subdirectory as well. See [Directory structure](Directory-structure)
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### Apache
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```bash
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# Install apache + mod_php and PHP modules
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sudo apt update
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sudo apt install apache2 libapache2-mod-php php-json php-mbstring php-gd php-intl php-curl php-gettext
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# Edit the virtualhost configuration file with your favorite editor (replace the example domain name)
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sudo nano /etc/apache2/sites-available/shaarli.mydomain.org.conf
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```
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```apache
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<VirtualHost *:80>
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ServerName shaarli.mydomain.org
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DocumentRoot /var/www/shaarli.mydomain.org/
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# For SSL/TLS certificates acquired with certbot or self-signed certificates
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# Redirect HTTP requests to HTTPS, except Let's Encrypt ACME challenge requests
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RewriteEngine on
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RewriteRule ^.well-known/acme-challenge/ - [L]
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RewriteCond %{HTTP_HOST} =shaarli.mydomain.org
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RewriteRule ^ https://shaarli.mydomain.org%{REQUEST_URI} [END,NE,R=permanent]
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</VirtualHost>
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# SSL/TLS configuration for Let's Encrypt certificates managed with mod_md
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#MDomain shaarli.mydomain.org
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#MDCertificateAgreement accepted
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#MDContactEmail admin@shaarli.mydomain.org
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#MDPrivateKeys RSA 4096
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<VirtualHost *:443>
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ServerName shaarli.mydomain.org
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DocumentRoot /var/www/shaarli.mydomain.org/
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# SSL/TLS configuration for Let's Encrypt certificates acquired with certbot standalone
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SSLEngine on
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SSLCertificateFile /etc/letsencrypt/live/shaarli.mydomain.org/fullchain.pem
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SSLCertificateKeyFile /etc/letsencrypt/live/shaarli.mydomain.org/privkey.pem
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# Let's Encrypt settings from https://github.com/certbot/certbot/blob/master/certbot-apache/certbot_apache/_internal/tls_configs/current-options-ssl-apache.conf
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SSLProtocol all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1
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SSLCipherSuite ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
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SSLHonorCipherOrder off
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SSLSessionTickets off
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SSLOptions +StrictRequire
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# SSL/TLS configuration for self-signed certificates
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#SSLEngine on
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#SSLCertificateFile /etc/ssl/certs/ssl-cert-snakeoil.pem
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#SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key
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# Optional, log PHP errors, useful for debugging
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#php_flag log_errors on
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#php_flag display_errors on
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#php_value error_reporting 2147483647
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#php_value error_log /var/log/apache2/shaarli-php-error.log
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<Directory /var/www/shaarli.mydomain.org/>
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# Required for .htaccess support
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AllowOverride All
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Require all granted
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</Directory>
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<LocationMatch "/\.">
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# Prevent accessing dotfiles
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RedirectMatch 404 ".*"
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</LocationMatch>
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<LocationMatch "\.(?:ico|css|js|gif|jpe?g|png)$">
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# allow client-side caching of static files
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Header set Cache-Control "max-age=2628000, public, must-revalidate, proxy-revalidate"
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</LocationMatch>
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# serve the Shaarli favicon from its custom location
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Alias favicon.ico /var/www/shaarli.mydomain.org/images/favicon.ico
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</VirtualHost>
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```
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```bash
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# Enable the virtualhost
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sudo a2ensite shaarli.mydomain.org
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# mod_ssl must be enabled to use TLS/SSL certificates
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# https://httpd.apache.org/docs/current/mod/mod_ssl.html
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sudo a2enmod ssl
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# mod_rewrite must be enabled to use the REST API
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# https://httpd.apache.org/docs/current/mod/mod_rewrite.html
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sudo a2enmod rewrite
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# mod_headers must be enabled to set custom headers from the server config
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sudo a2enmod headers
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# mod_version must only be enabled if you use Apache 2.2 or lower
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# https://httpd.apache.org/docs/current/mod/mod_version.html
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# sudo a2enmod version
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# restart the apache service
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sudo systemctl restart apache2
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```
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- [How to install the Apache web server](https://www.digitalocean.com/community/tutorials/how-to-install-the-apache-web-server-on-debian-10)
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- [Apache/PHP - error log per VirtualHost - StackOverflow](http://stackoverflow.com/q/176)
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- [Apache - PHP: php_value vs php_admin_value and the use of php_flag explained](https://ma.ttias.be/php-php_value-vs-php_admin_value-and-the-use-of-php_flag-explained/)
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- [Server-side TLS (Apache) - Mozilla](https://wiki.mozilla.org/Security/Server_Side_TLS#Apache)
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- [Apache 2.4 documentation](https://httpd.apache.org/docs/2.4/)
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- [Apache mod_proxy](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html)
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- [Apache Reverse Proxy Request Headers](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#x-headers)
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### Nginx
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This examples uses nginx and the [PHP-FPM](https://www.digitalocean.com/community/tutorials/how-to-install-linux-nginx-mariadb-php-lemp-stack-on-debian-10#step-3-%E2%80%94-installing-php-for-processing) PHP interpreter. Nginx and PHP-FPM must be running using the same user and group, here we assume the user/group to be `www-data:www-data`.
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```bash
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# install nginx and php-fpm
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sudo apt update
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sudo apt install nginx php-fpm
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# Edit the virtualhost configuration file with your favorite editor
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sudo nano /etc/nginx/sites-available/shaarli.mydomain.org
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```
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```nginx
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server {
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listen 80;
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server_name shaarli.mydomain.org;
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# redirect all plain HTTP requests to HTTPS
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return 301 https://shaarli.mydomain.org$request_uri;
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}
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server {
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# ipv4 listening port/protocol
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listen 443 ssl http2;
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# ipv6 listening port/protocol
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listen [::]:443 ssl http2;
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server_name shaarli.mydomain.org;
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root /var/www/shaarli.mydomain.org;
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# log file locations
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# combined log format prepends the virtualhost/domain name to log entries
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access_log /var/log/nginx/access.log combined;
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error_log /var/log/nginx/error.log;
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# paths to private key and certificates for SSL/TLS
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ssl_certificate /etc/ssl/shaarli.mydomain.org.crt;
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ssl_certificate_key /etc/ssl/private/shaarli.mydomain.org.key;
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# Let's Encrypt SSL settings from https://github.com/certbot/certbot/blob/master/certbot-nginx/certbot_nginx/_internal/tls_configs/options-ssl-nginx.conf
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ssl_session_cache shared:le_nginx_SSL:10m;
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ssl_session_timeout 1440m;
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ssl_session_tickets off;
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ssl_protocols TLSv1.2 TLSv1.3;
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ssl_prefer_server_ciphers off;
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ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";
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# increase the maximum file upload size if needed: by default nginx limits file upload to 1MB (413 Entity Too Large error)
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client_max_body_size 100m;
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# relative path to shaarli from the root of the webserver
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location / {
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# default index file when no file URI is requested
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index index.php;
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try_files $uri /index.php$is_args$args;
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}
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location ~ (index)\.php$ {
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try_files $uri =404;
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# slim API - split URL path into (script_filename, path_info)
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fastcgi_split_path_info ^(.+\.php)(/.+)$;
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# pass PHP requests to PHP-FPM
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fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
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fastcgi_index index.php;
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include fastcgi.conf;
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}
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location ~ \.php$ {
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# deny access to all other PHP scripts
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# disable this if you host other PHP applications on the same virtualhost
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deny all;
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}
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location ~ /\. {
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# deny access to dotfiles
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deny all;
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}
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location ~ ~$ {
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# deny access to temp editor files, e.g. "script.php~"
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deny all;
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}
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location = /favicon.ico {
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# serve the Shaarli favicon from its custom location
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alias /var/www/shaarli/images/favicon.ico;
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}
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# allow client-side caching of static files
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location ~* \.(?:ico|css|js|gif|jpe?g|png)$ {
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expires max;
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add_header Cache-Control "public, must-revalidate, proxy-revalidate";
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# HTTP 1.0 compatibility
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add_header Pragma public;
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}
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}
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```
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```bash
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# enable the configuration/virtualhost
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sudo ln -s /etc/nginx/sites-available/shaarli.mydomain.org /etc/nginx/sites-enabled/shaarli.mydomain.org
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# reload nginx configuration
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sudo systemctl reload nginx
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```
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- [How to install the Nginx web server](https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-debian-10)
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- [Nginx Beginner's guide](http://nginx.org/en/docs/beginners_guide.html)
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- [Nginx documentation](https://nginx.org/en/docs/)
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- [Nginx ngx_http_fastcgi_module](http://nginx.org/en/docs/http/ngx_http_fastcgi_module.html)
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- [Nginx Pitfalls](http://wiki.nginx.org/Pitfalls)
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- [Nginx PHP configuration examples - Karl Blessing](http://kbeezie.com/nginx-configuration-examples/)
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- [Server-side TLS (Nginx) - Mozilla](https://wiki.mozilla.org/Security/Server_Side_TLS#Nginx)
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## Reverse proxies
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If Shaarli is hosted on a server behind a [reverse proxy](https://en.wikipedia.org/wiki/Reverse_proxy) (i.e. there is a proxy server between clients and the web server hosting Shaarli), configure it accordingly. See [Reverse proxy](Reverse-proxy.md) configuration.
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## Allow import of large browser bookmarks export
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Web browser bookmark exports can be large due to the presence of base64-encoded images and favicons/long subfolder names. Edit the PHP configuration file.
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- Apache: `/etc/php/<PHP_VERSION>/apache2/php.ini`
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- Nginx + PHP-FPM: `/etc/php/<PHP_VERSION>/fpm/php.ini` (in addition to `client_max_body_size` in the [Nginx configuration](#nginx))
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```ini
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[...]
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# (optional) increase the maximum file upload size:
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post_max_size = 100M
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[...]
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# (optional) increase the maximum file upload size:
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upload_max_filesize = 100M
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```
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To verify PHP settings currently set on the server, create a `phpinfo.php` in your webserver's document root
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```bash
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# example
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echo '<?php phpinfo(); ?>' | sudo tee /var/www/shaarli.mydomain.org/phpinfo.php
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#give read-only access to this file to the webserver user
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sudo chown www-data:root /var/www/shaarli.mydomain.org/phpinfo.php
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sudo chmod 0400 /var/www/shaarli.mydomain.org/phpinfo.php
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```
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|
|
|
Access the file from a web browser (eg. <https://shaarli.mydomain.org/phpinfo.php> and look at the _Loaded Configuration File_ and _Scan this dir for additional .ini files_ entries
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|
|
|
It is recommended to remove the `phpinfo.php` when no longer needed as it publicly discloses details about your webserver configuration.
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|
|
|
|
|
## Robots and crawlers
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|
|
|
To opt-out of indexing your Shaarli instance by search engines, create a `robots.txt` file at the root of your virtualhost:
|
|
|
|
```
|
|
User-agent: *
|
|
Disallow: /
|
|
```
|
|
|
|
By default Shaarli already disallows indexing of your local copy of the documentation by default, using `<meta name="robots">` HTML tags. Your Shaarli instance may still be indexed by various robots on the public Internet, that do not respect this header or the robots standard.
|
|
|
|
- [Robots exclusion standard](https://en.wikipedia.org/wiki/Robots_exclusion_standard)
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|
- [Introduction to robots.txt](https://support.google.com/webmasters/answer/6062608?hl=en)
|
|
- [Robots meta tag, data-nosnippet, and X-Robots-Tag specifications](https://developers.google.com/search/reference/robots_meta_tag)
|
|
- [About robots.txt](http://www.robotstxt.org)
|
|
- [About the robots META tag](https://www.robotstxt.org/meta.html)
|
|
|
|
|
|
## Fail2ban
|
|
|
|
[fail2ban](http://www.fail2ban.org/wiki/index.php/Main_Page) is an intrusion prevention framework that reads server (Apache, SSH, etc.) and uses `iptables` profiles to block brute-force attempts. You need to create a filter to detect shaarli login failures in logs, and a jail configuation to configure the behavior when failed login attempts are detected:
|
|
|
|
```ini
|
|
# /etc/fail2ban/filter.d/shaarli-auth.conf
|
|
[INCLUDES]
|
|
before = common.conf
|
|
[Definition]
|
|
failregex = \s-\s<HOST>\s-\sLogin failed for user.*$
|
|
ignoreregex =
|
|
```
|
|
|
|
```ini
|
|
# /etc/fail2ban/jail.local
|
|
[shaarli-auth]
|
|
enabled = true
|
|
port = https,http
|
|
filter = shaarli-auth
|
|
logpath = /var/www/shaarli.mydomain.org/data/log.txt
|
|
# allow 3 login attempts per IP address
|
|
# (over a period specified by findtime = in /etc/fail2ban/jail.conf)
|
|
maxretry = 3
|
|
# permanently ban the IP address after reaching the limit
|
|
bantime = -1
|
|
```
|
|
|
|
Then restart the service: `sudo systemctl restart fail2ban`
|
|
|
|
|
|
## What next?
|
|
|
|
[Shaarli installation](Installation.md)
|