Homelab, Linux, JS & ABAP (~˘▾˘)~
 

Category: Homelab

Docker

[Docker] Fefe über Container Technologien

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https://blog.fefe.de/?ts=a0d07bd8

“Wisst ihr, was mir in dunklen Zeiten wie dieser Jahreszeit Erheiterung ins Leben bringt? Dieser Spirale zuzugucken:

  1. Unsere Software ist zu komplex, wir haben die Komplexität nicht im Griff! Pass auf, wir machen da ein verteiltes System daraus! Dann sind die Einzelteile weniger komplex. Vielleicht können wir das dann unter Kontrolle bringen.
  2. Das verteilte System braucht viel mehr administrativen Aufwand. Pass auf, den automatisieren wir weg! Wir machen Container! Docker!
  3. Docker-Aufsetzen braucht viel mehr administativen Aufwand. Pass auf, den automatisieren wir weg! Wir machen Kubernetes!
  4. Kubernetes braucht viel mehr administativen Aufwand. Pass auf, den automatisieren wir weg! Wir machen Ansible!
  5. Ansible braucht viel mehr administativen Aufwand. Pass auf, den automatisieren wir weg! Wir machen Chef / Salt!

Frank hat im letzten Alternativlos das wunderbare Wort “Komplexitätsverstärker” eingeführt. Das ist genau, was hier passiert. Am Ende hast du ein Schönwettersystem. Wenn das erste Mal der Wind dreht, dann hast du einen Scherbenhaufen. Niemand kann diese ganze Komplexität mehr durchblicken.”

WordPress

[WordPress] SyntaxHighlighter Ampersand character

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Recently I noticed that the character & is displayed in the SyntaxHighlighter like this: &amp

To fix this, simply add this snippet of the user kaggdesign to /var/www/html/wp-content/plugins/syntaxhighlighter/syntaxhighlighter.php 

/**
 * Filter to fix issue with & in SyntaxHighlighter Evolved plugin.
 *
 * @param string $code Code to format.
 * @param array $atts Attributes.
 * @param string $tag Tag.
 *
 * @return string
 */
function kagg_syntaxhighlighter_precode( $code, $atts, $tag ) {
	if ( 'code' === $tag ) {
		$code = wp_specialchars_decode( $code );
	}
	return $code;
}
add_filter( 'syntaxhighlighter_precode', 'kagg_syntaxhighlighter_precode', 10, 3 );

This can be done directly from the webinterface. Just go to Plugins -> Plugin Editor -> select the Plugin SyntaxHighlighter Evolved -> add the snippet to the end

Proxmox

[Proxmox] Scrub cronjob

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Default scrub cronjob when installing Proxmox on ZFS: 

nocin@pve:~$ cat /etc/cron.d/zfsutils-linux 
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# Scrub the second Sunday of every month.
24 0 8-14 * * root [ $(date +\%w) -eq 0 ] && [ -x /usr/lib/zfs-linux/scrub ] && /usr/lib/zfs-linux/scrub

ZFS

[ZFS] Destroy snapshots

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Snapshots in ZFS aren’t cumulative. They just include the difference between the filesystem at the time you took the snapshot and now.
Meaning if you have snapshots A, B and C, deleting A doesn’t impact the status of the remaining B and C. This is a common point of confusion when coming from other systems where you might have to consolidate snapshots to get to a consistent state.

This means, you can delete snapshots out of the middle of a list and not screw up snapshots before or after the one you deleted. So if you have:

pool/dataset@snap1 
pool/dataset@snap2 
pool/dataset@snap3 
pool/dataset@snap4 
pool/dataset@snap5

You can safely sudo zfs destroy pool/dataset@snap3 and 1, 2, 4, and 5 will all be perfectly fine afterwards.

You can estimate the amount of space reclaimed by deleting multiple snapshots by doing a dry run (-n) on zfs destroy like this:

sudo zfs destroy -nv pool/dataset@snap4%snap8
would destroy pool/dataset@snap4
would destroy pool/dataset@snap5
would destroy pool/dataset@snap6
would destroy pool/dataset@snap7
would destroy pool/dataset@snap8
would reclaim 25.2G

List your snapshots (for a specific dataset simply use grep):

sudo zfs list -rt snapshot | grep pool/dataset

If you need to free some space, you can sort zfs snapshots by size:

zfs list -o name,used -s used -t snap
Docker, Nextcloud

[Nextcloud] Run OnlyOffice Document Server in Docker

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If you don’t already have it, you first have to install Docker. Then just get the docker-compose.yml for OnlyOffice

wget https://raw.githubusercontent.com/ONLYOFFICE/Docker-DocumentServer/master/docker-compose.yml

and activate the JSON Web Token validation. 

nano docker-compose.yml

      - JWT_ENABLED=true
      - JWT_SECRET=your_secret
      - JWT_HEADER=Authorization

Now just run the container.

sudo docker-compose up -d

To use OnlyOffice with Nextcloud, your container needs to reachable via https, so you need to add a subdomain and SSL Certificate in your Nginx reverse proxy. Then just go to your Nextcloud installation and install the OnlyOffice Addon. There just enter the new domain to your OnlyOffice Docker Container and the JSON Web Token. Office files should now be editable in OnlyOffice.

Homelab

[Router/Firewall] Hard- & Software Sammlung

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Software

Hardware

Einfach zu bedienende Fertiglösungen

Nextcloud

[Nextcloud] Maintenance mode

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# Change into your nextcloud directory
cd /var/www/nextcloud/
 
# Enable Nextcloud-Maintenance mode
sudo -u www-data php occ maintenance:mode --on

# Do something...

# Disable Nextcloud-Maintenance mode
sudo -u www-data php occ maintenance:mode --off
Docker, Nextcloud

[Nextcloud] Run NextCloudPi Docker with external storage

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Links

NextCloudPi (Docs)
NextCloudPi on DockerHub
Current installation process (Outdated installation process, but contains some usefull information)

Installation

If you want to use the external storage app to mount an NFS share in Nextcloud, there are two ways when using Docker. Mount the NFS share directly inside the Docker container. This would be easier when the container is already up and runing. Or mount the NFS share on the Host and pass the mountpoint as an argument when creating the Docker container: -v /mnt/nfs/:/mnt/nfs/

DOMAIN=your.domain.com
docker run -ti -d -p 4443:4443 -p 443:443 -p 80:80 -v ncdata:/data -v /mnt/nfs/:/mnt/nfs/ --name nextcloudpi ownyourbits/nextcloudpi $DOMAIN --restart=unless-stopped

Now wait until you see ‘Init done’ in the logs.

docker logs -f nextcloudpi

ncdata

If you ever need direct access to your storage, you can find out where your files are located with:

docker inspect nextcloudpi

Scroll up to “Mounts” and look for the path behind “Source”.

"Source": "/var/lib/docker/volumes/ncdata/_data"

Now you still have to navigate through a few folders. I finally found my files here:

ls /var/lib/docker/volumes/ncdata/_data/nextcloud/data/ncp/files/

Update to latest NCP version

docker exec -it nextcloudpi ncp-update
Wallabag

[Docker] Wallabag installation

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https://www.wallabag.org
https://github.com/wallabag/docker

Just replace https://your_domain with your domain.

docker run -d --name wallabag --restart=always -v /opt/wallabag/data:/var/www/wallabag/data -v /opt/wallabag/images:/var/www/wallabag/web/assets/images -p 80:80 -e SYMFONY__ENV__DOMAIN_NAME=https://your_domain -e SYMFONY__ENV__FOSUSER_REGISTRATION=false wallabag/wallabag

Check with docker ps if the docker container is successfully up and running. Now just add a new subdomain with ssl in your nginx-proxy-manager.
Default login is wallabag:wallabag.

Their corresponding android app is also available on F-droid: https://f-droid.org/en/packages/fr.gaulupeau.apps.InThePoche/