[Júne's Wiki] rpi_nimbus

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<nav> 
  * {{fa>server?color=#8B0000}} Linux
    * [[rpi_common|■ General Things on Raspbian]]
    * [[debian_common|■ General info on Debian Linux]]
    * [[deb_cicada|𝐂𝐢𝐂𝐀𝐃𝐀 𝕊𝕒𝕩𝕠𝕥𝕦𝕞]]
    * [[deb_mutism|𝐌𝐔𝐓𝐢𝐒𝐌 𝕄𝕒𝕘𝕟𝕦𝕞]] 
    * [[deb_gilead|𝐆𝐢𝐋𝐄𝐀𝐃 𝔸𝕣𝕘𝕖𝕟𝕥𝕒]] 
    * [[deb_symbio|𝐒𝐘𝐌𝐁𝐢𝐎 ℂ𝕠𝕟𝕒𝕥𝕦𝕤]]
    * [[deb_tardis|𝐓𝐀𝐑𝐃𝐢𝐒 𝕊𝕡𝕒𝕥𝕚𝕦𝕞]] 
    * [[deb_debris|𝐃𝐄𝐁𝐑𝐢𝐒 ℂ𝕙𝕣𝕠𝕞𝕖]] 
  * {{fa>windows?color=#0000A0}} Windows
    * [[:pc_common|■ Common Works on Windows]]
    * [[PC_MESONiSM|𝐌𝐄𝐒𝐎𝐍𝐢𝐒𝐌]] 
    * [[PC_MESONiST|𝐌𝐄𝐒𝐎𝐍𝐢𝐒𝐓]]
  * {{fa>android?color=#006400}} Android
    * [[:cell_common|■ Common Stuffs on Androids]]
    * [[CELL_EPiCON|𝐄𝐏𝐢𝐂𝐎𝐍 𝔽𝟙]] 
    * [[CELL_EPiMER|𝐄𝐏𝐢𝐌𝐄𝐑 𝟡]] 
    * [[CELL_EPiLUX|𝐄𝐏𝐢𝐋𝐔𝐗 𝟟]]   
    * [[CELL_EPiTAP|𝐄𝐏𝐢𝐓𝐀𝐏 𝟙𝟙]] 
    * [[CELL_EPiETA|𝐄𝐏𝐢𝐄𝐓𝐀 𝟜]] 
</nav>

====== Webius Officium ─ NiMBUS deBlanc ======

{{:rpi_nimbus.jpg?nolink&250|}}

Name: {{mdi>cards?28&color=#BC5D2E}} ''**NiMBUS** deBlanc'' (official) | {{mdi>creation?28&color=#BC5D2E}} ''구운몽'' (korean)

----
==== Specification ==== 

{{mdi>raspberry-pi?32&color=#BC5D2E}} Model: [[https://www.raspberrypi.org/products/raspberry-pi-3-model-b/|Raspberry Pi 3 Model B]] [[wp>Raspberry_Pi#Model_B|Raspbierry Pi Model B]]

{{mdi>database-plus?32&color=#BC5D2E}} Storages --- {{mdi>harddisk}} [[SECURED:JUNE_HARDWARE#data_storage|Storage in details]] {{mdi>lock}}
  * {{mdi>database}} ''**240G**'' --- ''/var/www'' partition {{fa>usb?14&color=#005eb8}}
  * {{mdi>database}} ''**500G**'' --- ''~/storage'' partition {{fa>usb?14&color=#005eb8}}

=== Live status of storages ===

<code ini>
Mounted on     Type  Size  Used Avail Use%
/              ext4   15G  2.0G   12G  15%
/var/www       ext4  220G  474M  208G   1%
/home/www-data ext4  458G  313G  122G  72%
</code>

{{mdi>server-network?32&color=#BC5D2E}} --- {{mdi>wifi-strength-3-lock}} [[SECURED:HOME_NETWORK#dhcp_assigned_ip|Júne's home network]] {{mdi>lock}}
  * {{mdi>lan?color=#9000B3}} Wired (''NiMBUS-enx001'') 
  * {{mdi>wifi?color=#9000B3}} Wireless Connection (''NiMBUS-wlx001'') 
  * {{mdi>lan?color=#9000B3}} Wired {{fa>usb?14&color=#000000}} (''NiMBUS-wlx002'')  

{{mdi>web?32&color=#BC5D2E}}  Web publishing and web resources including [[wp>WebDAV]]

----

==== Hosting Services ==== 

<button type="primary" size="sm" icon="fa fa-lock">[[[[secured:web_admin#june_s_pion_gateway|admin]]</button> **''[[https://pi.meson.one/|Júne's PiON Gateway]]''**  --- WebDAV and Documents Archives 


<button type="primary"  size="sm" icon="fa fa-lock">[[[[secured:web_admin#june_s_cloud_platform|admin]]</button> **''[[https://cloud.meson.in|Júne's Cloud Platform]]''**  --- Gateway for all cloud services 

<button type="primary"  size="sm" icon="fa fa-lock">[[[[secured:web_admin#june_s_wiki|admin]]</button> **''[[https://wiki.meson.in|Júne's Wiki]]''**  --- What I Know Is ... Here 

<button type="danger" size="sm" icon="fa fa-sliders">[[https://wiki.meson.one/doku.php?id=secured:nginx_config#nimbus_debalanc|Nginx Configuration]]</button> Showing lively on OWL {{fa>opera?14&color=#cc0f16}} for ''**NiMBUS** deBlanc'' {{fa>lock?color=#808080}} 

----
==== ＋Work logs ==== 

  * ''adjust & optimize'' value of ''php-fpm'' -- ''/etc/php/7.x/fpm/pool.d/www.conf'' <sub>  --- Updated on //2020/07/25 21:40// </sub>
  * ''proxy_pass'' for ''transmission web'' with ''bit.meson.in'', ''tor.meson.in'' & ''gen.meson.in'' <sub>  --- Updated on //2020/07/25 04:15// </sub>
  * **''Fresh installation''** <sub>  --- Updated on //2020/07/25 04:13// </sub>
  * Change ''backup rsync'' to another partition <sub>  --- Updated on //2020/06/27 04:01// </sub>
  * Change ''web root'' of ''eigen.ml'', ''dav.meson.in'' & ''pdf.meson.in'' <sub>  --- Updated on //2020/06/27 04:00// </sub>
  * Plugin Wireless LAN {{mdi>usb}} & Wired Giga LAN {{fa>usb}} <sub>  --- Updated on //2020/02/22 03:32// </sub>
  * **''Fresh installation''** <sub>  --- Updated on //2020/02/11 02:16// </sub>
  * ''configure'' access.log and error.log separately  <sub> --- Updated on //2018/09/20 11:12//</sub>
  * {{mdi>sitemap}} ''create'' server block for  [ ''dav.meson.in'' ]  <sub> --- Updated on //2018/08/14 15:35//</sub> 
  * ''Optimize'' Nginx configuration for **''Dokuwiki''** [[https://www.nginx.com/resources/wiki/start/topics/recipes/dokuwiki/|reference content]]
  * {{mdi>book-open-page-variant}} ''create'' server block for  [ ''lib.meson.one'' ] library project <sub>  --- Updated on //2018/04/11 18:22//</sub> 
  * Activate gzip module in Nginx <sub>  --- Updated on //2018/02/27 06:10//</sub> 
  * Configured HTTP/2 for all sites <sub>  --- Updated on //2018/02/15 19:45//</sub> 
  * Finished to publish front page of ''pi.meson.one'' and ''cloud.meson.in'' 
  * ''Add USB Wireless (802.11n)'' and assigned  <sub>  --- Updated on //2018/01/31 19:47//</sub> 


<hidden>
■ For archived history of SSL renewal 
  * {{fa>certificate}} ''Renew SSL certificates'' (Let's Encrypt) done <sub>  --- Updated on //2019/08/01 18:48// </sub>
  * {{fa>certificate}} ''Renew SSL certificates'' (Let's Encrypt) done <sub>  --- Updated on //2019/05/23 01:57// </sub>
  * ''Renew SSL certificates'' (Let's Encrypt) done   <sub> --- Updated on //2019/03/13 20:08//</sub>
  * ''Renew SSL certificates'' (Let's Encrypt) done   --- <sub>Updated on</sub> //2018/10/21 00:29//
  * ''Renew SSL certificates'' (Let's Encrypt) done  --- Updated on //2018/08/13 21:11//
  * ''Renew SSL certificates'' (Let's Encrypt) done   --- Updated on //2018/06/01 21:07//
  * ''Renew SSL certificates'' (Let's Encrypt) done  --- Updated on //2018/03/12 11:13// 
  * ''Renew SSL certificates'' (Let's Encrypt) done  --- Updated on //2018/01/03 12:34// 
  * ''Renew SSL certificates'' (Let's Encrypt) done  --- Updated on //2017/10/26 03:35//
</hidden>

=== ＋Que to do === 

  * rsync with cloud service such as Box or Dropbox

  * Check security for WebDAV access and configuration

<hidden>
  * Organize front page of ''pi.meson.one'' and ''cloud.meson.in'' 
</hidden> 

----
==== Disable Build-in Radios ==== 

Edit ''/boot/config.txt'' 

<code ini> 
dtoverlay=disable-wifi
dtoverlay=disable-bt
</code> 

Or add configuration string in ''config.txt'' 

<code bash> 
echo "dtoverlay=pi3-disable-wifi" | sudo tee -a /boot/config.txt
echo "dtoverlay=pi3-disable-bt" | sudo tee -a /boot/config.txt
</code> 

Disable systemd service that initializez Bluetooth Modems connected by UART. 

<code bash> 
sudo systemctl disable hciuart.service
</code>

----
==== Setup different SSIDs ==== 

Default (initial) configuration for Wireless is stored in ''/etc/wpa_supplicant/wpa_supplicant.conf'' 

If another wireless device is ''wlan1'' then copy as ''wpa_supplicant-**wlan1**.conf'' and edit 

<code ini> 
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=wheel
network={
    ssid="example"
    scan_ssid=1
    key_mgmt=WPA-EAP WPA-PSK IEEE8021X NONE
    pairwise=CCMP TKIP
    group=CCMP TKIP WEP104 WEP40
    psk="very secret passphrase"
    eap=TTLS PEAP TLS
    identity="user@example.com"
    password="foobar"
    ca_cert="/etc/cert/ca.pem"
    client_cert="/etc/cert/user.pem"
    private_key="/etc/cert/user.prv"
    private_key_passwd="password"
    phase1="peaplabel=0"
    ca_cert2="/etc/cert/ca2.pem"
    client_cert2="/etc/cer/user.pem"
    private_key2="/etc/cer/user.prv"
    private_key2_passwd="password"
}
</code>
==== Enable your Server Blocks ==== 

<code bash> 
sudo ln -s /etc/nginx/sites-available/example.com /etc/nginx/sites-enabled/
</code>

----
==== Let's Encrypt ==== 
Login with Superuser ''root'' and clone required packages. Target directory is ''/root/letsencrypt''. Target directory could be wherever you want, which you should be careful about security and permission. Therefore, ''/root'' directory is a recommended whereas. 

<code bash>
  sudo su 
  git clone https://github.com/letsencrypt/letsencrypt /root/letsencrypt 
</code> 

Go to target directory to run the script 

<code bash>
  cd /root/letsencrypt 
  ./certbot-auto certonly --webroot --rsa-key-size 4096 -w /var/www/YOUR_ROOT_DIR/ -d YOUR.DOMAIN.COM 
</code> 

''YOUR_ROOT_DIR'' is root directory for the service of ''YOUR.DOMAIN.COM''. ''--rsa-key-size'' could be altered with another bit such as 2048 or less but 4096 is better choice for better security. 

After reviewing the successful messages, then default location of certificates is ''/etc/letsencrypt/live/YOUR.DOMAIN.COM/''. Usual error has something to do with not loading any pages in ''http'' protocol. So you make sure even simple page (**landing page**) in ''YOUR_ROOT_DIR'' properly. 

**MAKE SURE the renewal of certificates every 90 days** 

=== Renew Let's Encrypt certificates === 

For renewal certificates, run ''certbot-auto'' and follow the proceeds.

<code bash> 
./certbot-auto --domains YOUR.DOMAIN.COM
</code> 

=== Renew all Let's Encrypt certificates ===

Renew **ALL** certificates from Let's Encrypt, run 

<code bash> 
./certbot-auto renew
</code> 

=== Delete certificate(s) ===

Delete certificates from Let's Encrypt, run 

<code bash> 
./certbot-auto delete
</code> 

----

==== Let's Encrypt via repository ==== 

<code bash> 
 sudo apt update 
 sudo apt install certbot python-certbot-nginx 
</code> 

command is same as ''certbot-auto'' by ''root'' privilege. 

=== Create certificate(s) === 

<code bash> 
 certbot certonly --webroot -w /var/www/mydomain -d www.mydomain.com 
</code> 

=== Renew certificate(s) === 

<code bash> 
 certbot renew
</code> 

=== Delete certificate(s) === 

<code bash>
 certbot delete --cert-name delete.mydomain.com 
</code> 

 
=== Renew certificate(s) using systemd === 

Check renewal executes without error, 

<code bash> 
 sudo certbot renew --dry-run 
</code> 

== Service unit file == 

If no error, edit **service unit file** typically stored in ''/etc/systemd/system/''. Edit ''/etc/systemd/system/certbot-renewal.service'' 

<code ini> 
[Unit]
Description=Certbot Renewal

[Service]
ExecStart=/usr/bin/certbot renew --post-hook "systemctl restart nginx.service"
</code> 

Which restarts web service after renewing certificate(s).  

== Timer unit file == 

Modify ''/etc/systemd/system/certbot-renewal.timer'' to adjust timer for certbot renewal. 

<code ini> 
[Unit]
Description=Timer for Certbot Renewal

[Timer]
OnBootSec=300
OnUnitActiveSec=2w

[Install]
WantedBy=multi-user.target
</code> 

The configuration below will activate the service biweekly, and 300 seconds after boot-up.

== Using systemctl and journalctl == 

To start the timer
<code bash> 
  sudo systemctl start certbot-renewal.timer
</code> 

To enable the timer to be started on boot-up
<code bash> 
  sudo systemctl enable certbot-renewal.timer
</code> 

To show status information for the timer
<code bash> 
  systemctl status certbot-renewal.timer
</code> 

To show journal entries for the timer
<code bash> 
  journalctl -u certbot-renewal.service
</code>

----
==== SSL Configuration on Nginx ==== 

=== Generating Diffie-Hellman Param ===
<code bash>  
  openssl dhparam -out /..path../dhparma.pem 2048 
</code> 

4096 bit requires (approximately) 7 times CPU resources than 2048

----
=== Standard configuration for enhanced SSL === 
This configuration is for [[https://nginx.org/en/|Nginx Web Server]]. edit ''/etc/nginx/sites-available/default''

<accordion> 
<panel title="Standard configuration of Nginx with SSL"> 
<code nginx>
    # SSL configuration
  
     listen 443 ssl default_server;
     listen [::]:443 ssl default_server;  
    # default_server should be deleted for multi-casting domains 
  
     ssl_certificate /etc/letsencrypt/live/... (path) .../fullchain.pem;
     ssl_certificate_key /etc/letsencrypt/live/... (path) .../privkey.pem;
     ssl_session_timeout 5m;
     ssl_session_cache shared:SSL:20m;
  
    # Diffie-Hellman parameter for DHE ciphersuites
     ssl_dhparam /... (path) .../dhparam.pem;
  
    # Protocols and Ciphers
     ssl_protocols TLSv1.2 TLSv1.1 TLSv1;
     ssl_prefer_server_ciphers on;
    # last two ciphersuites only added because of Android 4.3
     ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA';
  
    # Add headers to serve security related headers
     add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;";
     add_header X-Content-Type-Options nosniff;
     add_header X-Frame-Options "SAMEORIGIN";
     add_header X-XSS-Protection "1; mode=block";
     add_header X-Robots-Tag none;
     add_header X-Download-Options noopen;
     add_header X-Permitted-Cross-Domain-Policies none;
  
    # OCSP Stapling ---
    # fetch OCSP records from URL in ssl_certificate and cache them
     ssl_stapling on;
     ssl_stapling_verify on;
  
    # verify chain of trust of OCSP response using Root CA and Intermediate certs
     ssl_trusted_certificate /etc/letsencrypt/live/... (path) .../chain.pem;
</code>
</panel>
</accordion>

{{fa>link?color=#BB0303}} [[:secured:web_admin#nginx_configuration|Nginx live configuration]] {{fa>lock?color=#050505}}

----
==== Create WebDAV directory on Nginx ==== 
**WebDAV** is web protocol based service to open directory and web resources via various ways. To enable WebDAV or Open directory in Nginx. Append the following code inside ''Server {  ...}'' line. 

<accordion>
<panel title="Standard configuration of WedDAV directory"> 
<code nginx> 
  location /webdav {
           alias     /home/user/WebDAV;
           client_body_temp_path /home/user/WebDAV/.temp;
           
           dav_methods     PUT DELETE MKCOL COPY MOVE;
           dav_ext_methods   PROPFIND OPTIONS;
           
           create_full_put_path  on;
           dav_access    user:rw group:rw all:r;
           autoindex     on;
           autoindex_format     html;     # OPTION: HTML | XML | JSON 
           auth_basic "TITLE FOR YOUR WEBDAV";
           auth_basic_user_file /home/user/WebDAV/.htpasswd;

           #fancyindex on; 
           #fancyindex_exact_size off; 

         }
</code> 
</panel> 
</accordion>

<accordion>
<panel title="Configuration with network allow/deny"> 
<code nginx> 
  #here you can specify various directories that respond as DAV.
  location /ergo-repo/ {
    root      /var/dav;
    client_body_temp_path /var/dav/temp;
    dav_methods     PUT DELETE MKCOL COPY MOVE;
    dav_ext_methods   PROPFIND OPTIONS;
    create_full_put_path  on;
    dav_access    user:rw group:rw all:rw;
    autoindex     on;
    #below you can specify the access restrictions. In this case, only people on the 141.142 network
    #can write/delete/etc. Everyone else can view.
    limit_except GET PROPFIND OPTIONS{
      allow 141.142.0.0/16;
      deny  all;
    }
    allow all;
  }
  #this is an example of a password restricted repository
  location /password-repo/ {
    root      /var/dav;
    client_body_temp_path /var/dav/temp;
    dav_methods     PUT DELETE MKCOL COPY MOVE;
    dav_ext_methods   PROPFIND OPTIONS;
    create_full_put_path  on;
    dav_access    user:rw group:rw all:rw;
    autoindex     on;
    auth_basic "restricted";
    auth_basic_user_file /etc/nginx/htpasswd;
  }
</code> 
</panel> 
</accordion>

''Fancyindex'' is an optional part if you have installed ''nginx-extra'' or ''nginx-full''. 

{{fa>warning?color=#000000}} When ''fancyindex'' is on, comment out ''autoindex'' directive. 

<code nginx> 
#  autoindex on;

   fancyindex on; 
   fancyindex_exact_size off; 
</code> 

== Authentication for access ==  

''.htpasswd'' file is authentication file for user to access correctly. To generate this file, install ''htpasswd''. 

<code bash> 
 sudo apt-get install apache2-utils  
</code> 

If you don’t have an .htpasswd or create new one, use the ''-c'' option to generate the file with the first user. It will prompt you for a password and encrypt it for you.

<code bash> 
  htpasswd -c /..path../ .. /../.htpasswd firstuser
</code> 

To add another user for this, 

<code bash> 
  htpasswd /..path../ .. /../.htpasswd seconduser
</code> 

Delete user. If the username exists in the specified ''.htpasswd'' file, it will be deleted.

<code bash> 
  htpasswd -D /..path../ .. /../.htpasswd firstuser 
</code>

Access ''<nowiki>https://YOUR.DOMAINS.COM/WebDAV</nowiki>'' in browser and check whether prompt dialogue pops up. 

----
==== Backup & archive web resources ====
 
Using ''rsync'', backup and archive web resource into another location. 
<code bash>
  30 5 * * 3 /usr/bin/rsync -Aax /var/www/ /.. (backup path..) ../web_backup_`date +"%Y%m%d"`/ 
</code>
Assume web root directory is ''/var/www/'' and to create backup folder with date, \\ Append ''crontab'' with root privilege - ''sudo crontab -e''.  \\ ''30 5 * * 3'' means run script at 05:30 (AM) every Wednesday (Mon:''1'' ... Sun:''7'' or ''0'')  

----   
==== Change style of web directory for WebDAV ====
Fancyindex modules in Nginx 

<code bash>
  sudo apt-get install nginx-extras 
</code> 

Add ''fancyindex'' directives in virtual host configuration files. 

<code nginx>
  location / {
    fancyindex on;
    fancyindex_exact_size off
  }
</code>

Insert following lines to let Fancyindex work in the web directory. 

<code nginx>
   fancyindex on;
   fancyindex_localtime on;
   fancyindex_exact_size off;
  # Specify the path to the header.html and foother.html files (server-wise)
   fancyindex_header "/Nginx-Fancyindex-Theme/header.html";
   fancyindex_footer "/Nginx-Fancyindex-Theme/footer.html";
  # Ignored files will not show up in the directory listing, but will still be public.
   fancyindex_ignore "examplefile.html";
  # Making sure folder where these files are do not show up in the listing.
   fancyindex_ignore "Nginx-Fancyindex-Theme";
  # Maximum file name length in bytes, change as you like.
   fancyindex_name_length 255;
</code>

----

==== Customized 404 page ==== 

Adding in ''/etc/nginx/sites-available/YOUR-WEB-CONFIG'' 

<code nginx>
  error_page 404 /custom_404.html;
        location = /custom_404.html {
                root /var/www/html;
                internal;
        }
</code> 

For 50x page, 

<code nginx>
  error_page 500 502 503 504 /custom_50x.html;
        location = /custom_50x.html {
                root /var/www/html;
                internal;
        }
</code> 
        
For test purpose, adding a dummy FastCGI pass with following lines. 

<code nginx>
    location /testing {
                fastcgi_pass unix:/does/not/exist;
        }
</code>

---- 

==== Unknown directive after upgrading Stretch ==== 
  * ''dav_ext_methods'' directive failed 
  * ''fancyindex'' directive failed 

This problem is due to not loading proper module in Nginx configuration. \\ Edit ''/etc/nginx/nginx.conf'' 

<code nginx>
    user www-data;
    worker_processes auto;
  
    pid /run/nginx.pid;
  
  include /etc/nginx/modules-enabled/*.conf;
  
    events {
      worker_connections 12288;
    } 
</code>

If this does not work, please check modules are located correctly or not in ''/etc/nginx/modules-enabled''. If not, run ''sudo apt-get install nginx-extra''. 

----
==== Setup password authentication in Nginx ==== 

<code bash> 
sudo apt-get update
sudo apt-get install apache2-utils
</code> 

Generating (creating) password file to enable authentication 

<code bash> 
sudo htpasswd -c /etc/nginx/.htpasswd username 
</code>  

Appending user in existing password file 

<code bash> 
sudo htpasswd /etc/nginx/.htpasswd another_user
</code> 

---- 
==== Configure HTTP/2 for Nginx ==== 

Edit ''/etc/nginx/sites-available/default''

<code nginx> 
listen 443 ssl http2 default_server;
listen [::]:443 ssl http2 default_server;
</code> 

Edit ''/etc/nginx/nginx.conf'' 

insert following line after 
<code nginx>
ssl_prefer_server_ciphers on;
</code> 

<code nginx> 
ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
</code> 

{{fa>cog?color=#000000}} HTTTP/2 online test: [[https://http2.pro/|HTTP2 Pro]] 

{{fa>cog?color=#000000}} For more information: [[https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-with-http-2-support-on-ubuntu-16-04|How To Set Up Nginx with HTTP/2 Support on Ubuntu 16.04]]

----
==== Nginx cache control ==== 

{{fa>graduation-cap?color=#000000}} Theoretical background: 
 [[https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching#defining-optimal-cache-control-policy|Google Web Fundementals]]  

Create ''/web.root/expires.conf'' site dedicated configuration file. 

<code nginx> 
# Expire rules for static content

# cache.appcache, your document html and data
location ~* \.(?:manifest|appcache|html?|xml|json)$ {
  expires -1;
  # access_log logs/static.log; # I don't usually include a static log
}

# Feed
location ~* \.(?:rss|atom)$ {
  expires 1h;
  add_header Cache-Control "public";
}

# Media: images, icons, video, audio, HTC
location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
  expires 1M;
  access_log off;
  add_header Cache-Control "public";
}

# CSS and Javascript
location ~* \.(?:css|js)$ {
  expires 1y;
  access_log off;
  add_header Cache-Control "public";
}
</code> 

include ''conf'' in ''Nginx site configuration'' 

<code nginx> 
server {
    # Note that it's listening on port 9000
    listen 9000 default_server;
    root /web.root/;
    index index.html index.htm;

    server_name example.com www.example.com;

    charset utf-8;
    include /web.root/basic.conf;

    location / {
        try_files $uri $uri/ =404;
    }
}
</code> 

----
==== Activate gzip module ==== 

{{fa>graduation-cap?color=#000000}} [[http://nginx.org/en/docs/http/ngx_http_gzip_module.html|Nginx Manual]] 

edit ''/etc/nginx/nginx.conf'' add following lines or ''uncomment out''

<code nginx> 
gzip on;
gzip_disable "msie6";

# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
</code> 

Verify working using ''cURL'' with ''Accept-Encoding''
<code bash> 
  curl -H "Accept-Encoding: gzip" -I https://web.url/uri/object.css 
</code> 

----
===== Installing DokuWiki ===== 

==== Post installation ==== 

=== Setup permissions of directories === 

''data'' directory

<code bash>
wiki/to/path$ sudo chmod -R g=rwX,u=rwX,o=rX data/
wiki/to/path$ sudo chown -R www-data:www-data data/
</code>

everything ''below the data'' directory

<code bash>
wiki/to/path/data$ sudo chmod 2775 {attic,cache,index,locks,media,meta,pages,tmp}
wiki/to/path/data$ sudo chown www-data:www-data {attic,cache,index,locks,media,meta,pages,tmp}
</code>

For newly created directories, it might require ''setgid'' bit in order to fully retain correct permissions after setting up the existing ones. 

----


===== Solved problems =====

==== symbol lookup error ==== 

<text type="warning">{{fa>exclamation}} **Problem**</text>: Error during ''sudo apt update''

<text type="danger">{{fa>bug}} **Symptom**</text>
<code text> 
apt-get: symbol lookup error: /usr/lib/arm-linux-gnueabihf/libapt-pkg.so.4.12: undefined symbol: 
</code>

<text type="info">{{fa>lightbulb-o}} **Solution**</text>: reinstall package 
<code bash> 
# Download the current version of libapt-pkg4.12
wget http://mirrordirector.raspbian.org/raspbian/pool/main/a/apt/libapt-pkg4.12_0.9.7.9+rpi1+deb7u7_armhf.deb

# Install it
sudo dpkg -i libapt-pkg4.12_0.9.7.9+rpi1+deb7u7_armhf.deb
</code>

----
===== Known problems ===== 

==== upstream timed out(110: Connection timed out) ====
<text type="warning">{{fa>exclamation}} **Problem**</text>: Error found in log ''/var/log/nginx/xxx_error.log'', 

<code logtalk>
  upstream timed out (110: Connection timed out) while reading response header from upstream 
</code>

<text type="danger">{{fa>bug}} **Symptom**</text>: No symptom while running website. Only found in error log. 

<text type="info">{{fa>lightbulb-o}} **Solution**</text>:  [[https://www.digitalocean.com/community/questions/nginx-error-111-connection-refused|Solution #1]]

----
==== Under-voltage detected! (0x00050005) ====
<text type="warning">{{fa>exclamation}} **Problem**</text>: Error found in log ''/var/log/kern.log'', 

<code logtalk>
  Under-voltage detected! (0x00050005)
</code>

<text type="danger">{{fa>bug}} **Symptom**</text>: No symptom while running website. Only found in error log. 

<text type="info">{{fa>lightbulb-o}} **Solution**</text>: