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[Nextcloud] Run NextCloudPi Docker with external storage

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Current installation process (Outdated installation process, but contains some usefull information)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

[Docker] Wallabag installation

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/

[NAS] OpenSource NAS-Systeme & Self-hosting Lösungen

NAS

TrueNAS Core (FreeBSD) / TrueNAS Scale (Debian)
XigmaNAS (FreeBSD/FreeNAS, ehemals NAS4FREE)
OpenMediaVault (Debian)
Xpenology (bootloader for Synology’s DSM)
OmniOS Community Edition (Illumos) mit Napp-IT
Rockstor (CentOS)

Self-hosting / Hypervisor

YunoHost (Debian)
Proxmox (Debian)
OmniOS Community Edition (Illumos)
SmartOS (Illumos)
Danube Cloud (SmartOS)
XCP-ng (XenServer / heute Citrix Hypervisor)

[NGINX] Monitoring Nginx using Netdata

Recently I saw this tutorial about monitoring Nginx with Netdata and tried it by myself. I have running Netdata on my Proxmox Host and Nginx inside LXC. So I could skip step 1 and 2 of the tutorial. Since I’m using the super simple nginx-proxy-manager, which comes as docker deployment, it took me some minutes to figure out, how to enable the Nginx ‘stub_status‘ module (which is step 3 of the tutorial). Here’s what I did.

SSH into the LXC where the Nginx Docker is running. Look up the nginx container name (root_app_1) and open a shell in the running container.

docker ps
docker exec -it root_app_1 /bin/bash

Check if the ‘stub_module‘ is already enabled. The following command should return: with-https_stub_status_module
I got it from here.

nginx -V 2>&1 | grep -o with-https_stub_status_module

Next add a location to the nginx ‘server {}‘ block in the default config, to make it reachable via Netdata. The tutorial goes to ‘/etc/nginx/sites-available/default‘, another tutorial is editing ‘/etc/nginx/nginx.conf‘, but I found the default config in ‘/etc/nginx/conf.d/default.conf’.

nano /etc/nginx/conf.d/default.conf

If nano is not installed (bash: nano: command not found), just install it. Get more information here or here.

apt update 
apt install nano -y

Insert the new location in the server { listen 80; …..} block. In my case I have running Netdata on my Proxmox host, so i added localhost and my Proxmox ip.

  location /nginx_status {
	stub_status;
	allow 192.168.178.100; #only allow requests from pve
	allow 127.0.0.1;	  #only allow requests from localhost
	deny all;		  #deny all other hosts	
  }

Save, exit your docker container and restart it.

docker restart root_app_1

SSH into Proxmox and check with curl, if you able to reach the new nginx location.

For the last step Configure Netdata to Monitor Nginx (step 4) , just follow the Netdata Wiki. Place a new file called nginx.conf on your Netdata host.

nano /etc/netdata/python.d/nginx.conf

Because Netdata is not running local, use ‘remote‘ following the url, instead of local and localhost.

update_every : 10
priority     : 90100

remote:
  url     : 'https://192.168.178.197/nginx_status'

Restart Netdata and your are done.

sudo systemctl restart netdata

[Shell] Delete a folder and its content

If you downloaded a series there are often folders for each episode. Each episode folder often includes another folder called “Sample” with a short demo video file.

Series -> Season 01 -> Episode 01 -> Sample -> sample.mkv

To get rid of these you can use the “find” and “rm” command. To remove each sample folder with its content you have to use the remove command with an “-r”.

find -name "Sample" -exec rm -r "{}" \;

[Nextcloud] Installing Collaboraoffice in LXC

Both, Nextcloud and Collabora, are recommending the Docker installation for Collaboraoffice (here and here). But I wasn’t able to get the Collabora Docker Image running succesfully inside an Debian Buster LXC. There were appearing some errors and as far as I understand, it has something to do with running an LXC on ZFS. After spending about 3 hours I gave up and did a manual installation.

Installation

For a current installation guide, have look on their website here.
Install https support for apt and add Collabora CODE repository. (CODE = Collabora Online Development Edition)

sudo apt install apt-transport-https ca-certificates
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0C54D189F4BA284D

Add the Collabora CODE repository to the apt sources list.

nano /etc/apt/sources.list.d/collabora.list

Add the following line for Debian Buster:

deb https://www.collaboraoffice.com/repos/CollaboraOnline/CODE-debian10 ./

Now update the repository and install Collabora. (lool = LibreOffice OnLine)

sudo apt update
sudo apt install loolwsd code-brand

Configuration

You have to edit three sections in the config: SSL handling, inserting your Nextcloud domain as WOPI client and add some credentials for webinterface. So open the config with:

nano /etc/loolwsd/loolwsd.xml
  1. If you are using a reverse proxy (I have running a docker with nginx) which is managing all SSL certifactes, you don’t need local certifactes for your Collaboraoffice. So scroll down to the SSL settings, disable SSL and enable SSL termination.
   <ssl desc="SSL settings">
        <enable type="bool" desc="Controls whether SSL encryption is enable (do not disable for production deployment). If default is false, must first be compiled with SSL support to enable." default="true">false</enable>
        <termination desc="Connection via proxy where loolwsd acts as working via https, but actually uses https." type="bool" default="true">true</termination>
  • 2. Next add you Nextcloud domain in the WOPI storage section.
    <storage desc="Backend storage">
        <filesystem allow="false" />
        <wopi desc="Allow/deny wopi storage. Mutually exclusive with webdav." allow="true">
            <host desc="Regex pattern of hostname to allow or deny." allow="true">localhost</host>
            <host desc="Regex pattern of hostname to allow or deny." allow="true">nextcloud\.domain\.org</host>
  • 3. Add your credentials fot the webinterface.
  <admin_console desc="Web admin console settings.">
        <enable desc="Enable the admin console functionality" type="bool" default="true">true</enable>
        <enable_pam desc="Enable admin user authentication with PAM" type="bool" default="false">false</enable_pam>
        <username desc="The username of the admin console. Ignored if PAM is enabled.">user_name</username>
        <password desc="The password of the admin console. Deprecated on most platforms. Instead, use PAM or loolconfig to set up a secure password.">super_secret_password</password>

Now restart loolwsd and check the status.

systemctl restart loolwsd.service
systemctl status loolwsd.service

Check if the https connection is working via browser https://ipaddress:9980 or curl:

curl -vkI https://localhost:9980

You can reach the webinterface with:

https://ipaddress:9980/loleaflet/dist/admin/admin.html

Reverse Proxy

Go to your reverse proxy, in my case it’s nginx proxy manager, and add another subdomain for collabora with an SSL certificate.

You also have to add a few custom locations. Look at the Collabora website for the some nginx configs. I used the second with “SSL terminates at the proxy”. I also added the given custom locations via the webui, e.g.:

You should now be able to reach Collabora through your new subdomain via https.
https://collabora.your.domain.org/
And if you added /lool/adminws in your nginx config, you can also access the webui.
https://collabora.your.domain.org/loleaflet/dist/admin/admin.html

Install & configure Collabora Online App in Nextcloud

The easiest part is to install the Collabora Online App.
If done, go to Settings -> Collabora Online and set your Collabora Domain https://collabora.your.domain.org/ in here. Apply and edit your first excel in Nextcloud.

Done! 🙂

[ZFS] Rollback LXC

Look for a specific snapshot of your LXC.

sudo zfs list -rt snapshot | grep data/lxc/subvol-101

I just want to rollback 2 hours, so I choose the snapshot with timestamp 2019-12-05-1117.

...
data/lxc/subvol-110-disk-0@zfs-auto-snap_hourly-2019-12-05-0917   11,7M      -     24,2G  -
data/lxc/subvol-110-disk-0@zfs-auto-snap_hourly-2019-12-05-1017   11,9M      -     24,2G  -
data/lxc/subvol-110-disk-0@zfs-auto-snap_hourly-2019-12-05-1117   11,7M      -     24,2G  -
data/lxc/subvol-110-disk-0@zfs-auto-snap_hourly-2019-12-05-1217   11,8M      -     24,2G  -
data/lxc/subvol-110-disk-0@zfs-auto-snap_hourly-2019-12-05-1317   12,1M      -     24,2G  -

If there are one or more snapshots between the current state and the snapshot you want to rollback to, you have to add -r (force deletion) to the rollback command.

sudo zfs rollback -r data/lxc/subvol-110-disk-0@zfs-auto-snap_hourly-2019-12-05-1117

[ABAP] Fill table rows into range table

DATA(pernrs) = VALUE pernr_tab( ( |00000001| )
                                ( |00000002| )
                                ( |00000003| ) ).

DATA(lr_pernr) = VALUE cchry_pernr_range( FOR pernr IN pernrs ( sign   = 'I'
                                                                option = 'EQ'
                                                                low    = pernr
                                                                high   = '' ) ).
"Append row to range

APPEND VALUE #( option = 'EQ'
                sign   = 'I'
                low    = pernr ) TO lr_pernr.

[Docker] Install Docker in LXC running Debian Buster

If you already have an LXC with Debian running, add the following three lines to the lxc config (path /etc/pve/lxc/xxx.conf) and reboot the container:

lxc.apparmor.profile: unconfined
lxc.cgroup.devices.allow: a
lxc.cap.drop:

Now simply install docker.

sudo apt update && apt upgrade -y
sudo apt install apt-transport-https ca-certificates curl gnupg2 software-properties-common
curl -fsSL download.docker.com/linux/debian/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io docker-compose

Running and managing docker containers requires sudo privileges. If you don’t want to type sudo for every commmand, add your current user to the docker group.

sudo usermod -aG docker ${USER}

Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running.

sudo systemctl status docker

Test if the installtions is working correctly with hello-world.

sudo docker run hello-world

Each container you will create gets a unique ID and name you can look up with “docker ps”. To remove the docker instance just use “docker rm” followed by the ID or the container name.

sudo docker ps -a
sudo docker stop relaxed_williamson
sudo docker rm relaxed_williamson