If your MariaDB / MySQL root password is stored in .env , use this command:
source .env && docker-compose exec mariadb mysqlcheck -uroot -p$MARIADB_ROOT_PASSWORD --auto-repair --optimize --all-databases
You can also directly use the root password in the command:
docker-compose exec mariadb mysqlcheck -uroot -phoox8AiFahuniPaivatoh2iexighee --auto-repair --optimize --all-databases
In our previous post How to run Collabora office for Nextcloud using docker-compose we investigated how to configure your Collabora office server using docker-compose.yml.
If you want to use multiple domains, you need to change this line in .env:
COLLABORA_DOMAIN=collabora.mydomain.com
By reading the source code I found out that COLLABORA_DOMAIN is interpreted as a regular expression. Therefore you can use a (...|...|...) syntax.
COLLABORA_DOMAIN=(nextcloud.mydomain.com|nextcloud.myseconddomain.com)
After that, restart collabora.
Create this docker-compose.yml, e.g. in /opt/collabora-mydomain:
version: '3'
services:
code:
image: collabora/code:latest
restart: always
environment:
- password=${COLLABORA_PASSWORD}
- username=${COLLABORA_USERNAME}
- domain=${COLLABORA_DOMAIN}
- extra_params=--o:ssl.enable=true
ports:
- 9980:9980
Now create this .env with the configuration. You need to change the password and the domain!
COLLABORA_USERNAME=admin COLLABORA_PASSWORD=veecheit0Phophiesh1fahPah0Wue3 COLLABORA_DOMAIN=collabora.mydomain.com
Now you can create a systemd service to autostart by using our script from Create a systemd service for your docker-compose project in 10 seconds.
Run from inside your directory (e.g. /opt/collabora-mydomain)
curl -fsSL https://techoverflow.net/scripts/create-docker-compose-service.sh | sudo bash /dev/stdin
Now you need to configure your reverse proxy to point to port 9980. Here’s an example nginx config:
server {
server_name collabora.mydomain.com;
access_log /var/log/nginx/collabora.mydomain.com.access_log;
error_log /var/log/nginx/collabora.mydomain.com.error_log info;
location / {
proxy_pass https://127.0.0.1:9980;
proxy_http_version 1.1;
proxy_read_timeout 3600s;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Proto $scheme;
add_header X-Frontend-Host $host;
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
}
listen [::]:80; # managed by Certbot
}
Now open your browser and open collabora.mydomain.com. If collabora is running correctly, you should see:
OK
In Nextcloud, goto https://nextcloud.mydomain.com/settings/admin/richdocuments and set the
https://admin:[email protected]
Ensure to use your custom password from .env and your custom domain!
Click Save and you should see Collabora Online server is reachable:
When using the official nextcloud docker image, you will see a message like
Module php-imagick in this instance has no SVG support. For better compatibility it is recommended to install it.
on the system overview page
This is a bug in the docker image and will likely be resolved soon – in the meantime, we can just manually install the required library on the container:
docker-compose exec nextcloud apt -y update docker-compose exec nextcloud apt -y install libmagickcore-6.q16-6-extra
If you re-create the container, this change will be lost, but in my opinion it’s best to opt for a simple solution here and possible do it again once or twice as opposed to a permanent but much more labour-intensive procedure like updating the docker image and later migrating back to the official image.
When compiling a piece of software – for example in your Dockerfile or on your PC – you see a warning message like
lz4 library not found, compiling without it
Install liblz4, which is a library for a compression algorithm. On Ubuntu/Debian based systems you can install it using
sudo apt -y install liblz4-dev
In your Dockerfile, install using
RUN apt update && apt install -y liblz4-dev && rm -rf /var/lib/apt/lists/*
Otherwise, refer to the liblz4 GitHub page.
The following docker-compose.yml is a simple starting point for using ElasticSearch within a docker-based setup:
version: '2.2'
services:
elasticsearch1:
image: docker.elastic.co/elasticsearch/elasticsearch:7.13.4
container_name: elasticsearch1
environment:
- cluster.name=docker-cluster
- node.name=elasticsearch1
- cluster.initial_master_nodes=elasticsearch1
- bootstrap.memory_lock=true
- http.cors.allow-origin=http://localhost:1358,http://127.0.0.1:1358
- http.cors.enabled=true
- http.cors.allow-headers=X-Requested-With,X-Auth-Token,Content-Type,Content-Length,Authorization
- http.cors.allow-credentials=true
- "ES_JAVA_OPTS=-Xms512m -Xmx512m"
ulimits:
memlock:
soft: -1
hard: -1
volumes:
- ./esdata1:/usr/share/elasticsearch/data
ports:
- 9200:9200
dejavu:
image: appbaseio/dejavu
container_name: dejavu
ports:
- 1358:1358
Now create the esdata1 directory with the correct permissions:
sudo mkdir esdata1 sudo chown -R 1000:1000 esdata1
We also need to configure the vm.max_map_count sysctl parameter:
echo -e "\nvm.max_map_count=524288\n" | sudo tee -a /etc/sysctl.conf && sudo sysctl -w vm.max_map_count=524288
I recommend to place it in /opt/elasticsearch, but you can place wherever you like.
If you want to autostart it on boot, see Create a systemd service for your docker-compose project in 10 seconds or just use this snippet from said post:
curl -fsSL https://techoverflow.net/scripts/create-docker-compose-service.sh | sudo bash /dev/stdin
This will create a systemd service named elasticsearch (if your directory is named elasticsearch like /opt/elasticsearch) and enable and start it immediately. Hence you can restart using
sudo systemctl restart elasticsearch
and view the logs using
sudo journalctl -xfu elasticsearch
For more complex setup involving more than one node, see our previous post on ElasticSearch docker-compose.yml and systemd service generator
I have setup my FreePBX to use network_mode: 'host' but faced issues when it couldn’t connect to the MariaDB container which was not using network_mode: 'host'.
I fixed this by:
network_mode: 'host'127.0.0.1 (DB_HOST=127.0.0.1). Setting it to localhost did NOT allow FreePBX to connect to MariaDB!I recommend this service:
mariadb:
image: mariadb:latest
environment:
- MYSQL_DATABASE=servicename
- MYSQL_USER=servicename
- MYSQL_PASSWORD=${MARIADB_PASSWORD}
- MYSQL_ROOT_PASSWORD=${MARIADB_ROOT_PASSWORD}
volumes:
- ./mariadb_data:/var/lib/mysql
command: --default-storage-engine innodb
restart: unless-stopped
healthcheck:
test: mysqladmin -p${MARIADB_ROOT_PASSWORD} ping -h localhost
interval: 20s
start_period: 10s
timeout: 10s
retries: 3
(replace servicename by the name of your service, e.g. kimai, redmine, …) and this .env:
MARIADB_ROOT_PASSWORD=eiNgam3woh4ahTee4chi9vohvauk6a MARIADB_PASSWORD=shahb4alubei5Vie8arahhok2morae
This script uses bupto backup your docker-compose based redmine installation to a local bup folder e.g. in /var/lib/bup/my-redmine.bup:
#!/bin/bash
# Auto-determine the name from the directory name
# /opt/my-redmine => $NAME=my-redmine => /var/lib/bup/my-redmine.bup
export NAME=$(basename $(pwd))
export BUP_DIR=/var/lib/bup/$NAME.bup
bup_directory() {
echo "BUPing $1"
bup -d $BUP_DIR index $1 && bup save -9 --strip-path $(pwd) -n $1 $1
}
# Init
bup -d $BUP_DIR init
# Save MariaDB
source .env && docker-compose exec mariadb mysqldump -uroot -p${MARIADB_ROOT_PASSWORD} --all-databases | bup -d $BUP_DIR split -n $NAME-mariadb.sql
# Save directories
bup_directory redmine_data
bup_directory redmine_themes
# Backup self
bup_directory backup.sh
bup_directory docker-compose.yml
# OPTIONAL: Add par2 information
# This is only recommended for backup on unreliable storage or for extremely critical backups
# If you already have bitrot protection (like BTRFS with regular scrubbing), this might be overkill.
# Uncomment this line to enable:
# bup fsck -g
# OPTIONAL: Cleanup old backups
bup -d $BUP_DIR prune-older --keep-all-for 1m --keep-dailies-for 6m --keep-monthlies-for forever -9 --unsafe
It will backup:
mysqldumpredmine_data folderredmine_themes folderbackup.sh itselfdocker-compose.ymlPlace it in the same folder where docker-compose.yml is located.
The script is compatible with our previous post How to create a systemd backup timer & service in 10 seconds
When trying to install a package using rpm-ostree, you see an error message like
error: Transaction in progress: deploy --lock-finalization revision=5040eaabed46962a07b1e918ba5afa1502e1f898bf958673519cd83e986c228f --disallow-downgrade
The error message means that currently there’s an rpm-ostree operating in progress and you need to wait for it to finish.
In order to see which process is running, use
ps aux | grep rpm
[[email protected] uli]# ps aux | grep rpm root 730 41.2 1.7 1218036 34568 ? Ssl 18:41 0:30 /usr/bin/rpm-ostree start-daemon zincati 1896 0.0 0.8 481172 17324 ? Sl 18:41 0:00 rpm-ostree deploy --lock-finalization revision=5040eaabed46962a07b1e918ba5afa1502e1f898bf958673519cd83e986c228f --disallow-downgrade root 3223 0.0 0.0 221452 832 pts/0 S+ 18:42 0:00 grep --color=auto rpm
As you can see in the second line:
zincati 1896 0.0 0.8 481172 17324 ? Sl 18:41 0:00 rpm-ostree deploy --lock-finalization revision=5040eaabed46962a07b1e918ba5afa1502e1f898bf958673519cd83e986c228f --disallow-downgrade
the user zincati is currently running rpm-ostree on my system. zincati is the Fedora CoreOS auto-updater – in other words, an automatic system update is currently running on CoreOS.
When logging into your CoreOS instance, you see this warning message:
############################################################################ WARNING: This system is using cgroups v1. For increased reliability it is strongly recommended to migrate this system and your workloads to use cgroups v2. For instructions on how to adjust kernel arguments to use cgroups v2, see: https://docs.fedoraproject.org/en-US/fedora-coreos/kernel-args/ To disable this warning, use: sudo systemctl disable coreos-check-cgroups.service ############################################################################
but when you look at https://docs.fedoraproject.org/en-US/fedora-coreos/kernel-args/ you only see an example of how to initialize a new CoreOS instance with Ignition files with cgroups v2.
In order to migrate your system to cgroups v2, run
sudo rpm-ostree kargs --delete=systemd.unified_cgroup_hierarchy
After that, you need to reboot your system in order for the changes to take effect:
sudo systemctl reboot
After the system has rebooted, the error should disappear.
In constrast to other Linux-based systems, CoreOS requires quite a large learning curve to get installed properly – for example, you have to create the right ignition file for . This is a huge obstacle to overcome especially for first-time users.
This posts attempts to alleviate the steep learning curve by providing a basic config that is suitable for most practical (and especially small-scale) usecases and provides a good starting point for custom configs.
First, boot up the VM from the CoreOS Live CD. We assume that you have a DHCP network connected to eth0. You will see a shell immediately.
The VM will automatically acquire an IP address over DHCP.
You can use TechOverflow’s hosted ignition file for the installation. You need to use the correct disk instead of /dev/xvda depending on your hardware/hypervisor. If in doubt, use lsblk to find the correct disk name.
Now run the installation command:
sudo coreos-installer install /dev/xvda --copy-network --ignition-url https://techoverflow.net/coreos.ign
After the installation is finished, reboot using
reboot
and the machine has rebooted, you can use the default login credentials:
Username: admin
Password: coreos
The hostname is CoreOS.
You absolutely need to change the password after the installation! If you create another user, remember that you still need to change the password of the admin user using
sudo passwd admin
This is the Ignition YAML we used to create the correct config file. Use our online transpiler at https://fcct.techoverflow.net to compile the YAML to the JSON file. In order to create a new password hash, use TechOverflow’s docker-based mkpasswd approach.
variant: fcos
version: 1.0.0
passwd:
users:
- name: admin
groups:
- "sudo"
- "docker"
password_hash: $y$j9T$n6h8P2ik8tfoNUFBBoly00$7bnrMF8oFrB25Fc3NqigqEH/MI5YXIJwtCG/iEsns.2
systemd:
units:
- name: docker.service
enabled: true
- name: containerd.service
enabled: true
- name: [email protected]
dropins:
- name: autologin-core.conf
contents: |
[Service]
# Override Execstart in main unit
ExecStart=
# Add new Execstart with `-` prefix to ignore failure
ExecStart=-/usr/sbin/agetty --autologin admin --noclear %I $TERM
TTYVTDisallocate=no
storage:
files:
- path: /etc/hostname
mode: 0644
contents:
inline: |
CoreOS
- path: /etc/profile.d/systemd-pager.sh
mode: 0644
contents:
inline: |
# Tell systemd to not use a pager when printing information
export SYSTEMD_PAGER=cat
- path: /etc/sysctl.d/20-silence-audit.conf
mode: 0644
contents:
inline: |
# Raise console message logging level from DEBUG (7) to WARNING (4)
# to hide audit messages from the interactive console
kernel.printk=4
- path: /etc/ssh/sshd_config.d/20-enable-passwords.conf
mode: 0644
contents:
inline: |
# Enable SSH password login
PasswordAuthentication yes
which results in the following transpiled JSON:
{
"ignition": {
"version": "3.0.0"
},
"passwd": {
"users": [
{
"groups": [
"sudo",
"docker"
],
"name": "admin",
"passwordHash": "$y$j9T$n6h8P2ik8tfoNUFBBoly00$7bnrMF8oFrB25Fc3NqigqEH/MI5YXIJwtCG/iEsns.2"
}
]
},
"storage": {
"files": [
{
"contents": {
"source": "data:,CoreOS%0A"
},
"mode": 420,
"path": "/etc/hostname"
},
{
"contents": {
"source": "data:,%23%20Tell%20systemd%20to%20not%20use%20a%20pager%20when%20printing%20information%0Aexport%20SYSTEMD_PAGER%3Dcat%0A"
},
"mode": 420,
"path": "/etc/profile.d/systemd-pager.sh"
},
{
"contents": {
"source": "data:,%23%20Raise%20console%20message%20logging%20level%20from%20DEBUG%20(7)%20to%20WARNING%20(4)%0A%23%20to%20hide%20audit%20messages%20from%20the%20interactive%20console%0Akernel.printk%3D4%0A"
},
"mode": 420,
"path": "/etc/sysctl.d/20-silence-audit.conf"
},
{
"contents": {
"source": "data:,%23%20Enable%20SSH%20password%20login%0APasswordAuthentication%20yes%0A"
},
"mode": 420,
"path": "/etc/ssh/sshd_config.d/20-enable-passwords.conf"
}
]
},
"systemd": {
"units": [
{
"enabled": true,
"name": "docker.service"
},
{
"enabled": true,
"name": "containerd.service"
},
{
"dropins": [
{
"contents": "[Service]\n# Override Execstart in main unit\nExecStart=\n# Add new Execstart with `-` prefix to ignore failure\nExecStart=-/usr/sbin/agetty --autologin admin --noclear %I $TERM\nTTYVTDisallocate=no\n",
"name": "autologin-core.conf"
}
],
"name": "[email protected]"
}
]
}
}
In order to setup Vaultwarden in a docker-compose & SQLite based configuration (e.g. on CoreOS), first we need to create a directory. I recommend using /opt/vaultwarden.
Run all the following commands and place all the following files in the /opt/vaultwarden directory!
First, we’ll create a .env file with random passwords (I recommend using pwgen 30). Not using a unique, random password here is a huge security risk since it will allow full admin access to Vaultwarden!
ADMIN_TOKEN=iqueingufo3LohshoohoG3tha2zou6 SIGNUPS_ALLOWED=true
Now place your docker-compose.yml:
version: '3.4'
services:
vaultwarden:
image: vaultwarden/server:latest
environment:
- ADMIN_TOKEN=${ADMIN_TOKEN}
- SIGNUPS_ALLOWED=${SIGNUPS_ALLOWED}
volumes:
- ./vw_data:/data
ports:
- 17881:80
Next, we’ll create a systemd service to autostart docker-compose:
curl -fsSL https://techoverflow.net/scripts/create-docker-compose-service.sh | sudo bash /dev/stdin
This will automatically start vaultwarden.
Now you need to configure your reverse proxy server to point https://vaultwarden.mydomain.com . You need to use https, http won’t work due to some browser limitations.
Now we need to configure vaultwarden using the admin interface.
Go to https://vaultwarden.mydomain.com/admin and enter the ADMIN_TOKEN from .env.
There are two things that you need to configure here:
With these settings configured, Vaultwarden should be up and running and you can access it using https://vaultwarden.mydomain.com .
After the first user has been setup and tested, you can uncheck the Allow new signups in General settings in the admin interface. This is recommended since everyone who will be able to guess your domain name would be able to create a Vaultwarden account otherwise.
This is how I run my local passbolt instance.
First, create the directory. I use /opt/passbolt. Run all the following commands and place all the following files in that directory!
First, initialize the folders with the correct permissions:
mkdir -p passbolt_gpg chown -R 33:33 passbolt_gpg
Now create a .env file with random passwords (I recommend using pwgen 30):
MARIADB_ROOT_PASSWORD=meiJieseingi4dutiareimoh2Aiv5j MARIADB_USER_PASSWORD=ohre3ye1oNexeShiuChaengahzuemo
Now place your docker-compose.yml:
version: '3.4'
services:
mariadb:
image: mariadb:latest
environment:
- MYSQL_DATABASE=passbolt
- MYSQL_USER=passbolt
- MYSQL_PASSWORD=${MARIADB_USER_PASSWORD}
- MYSQL_ROOT_PASSWORD=${MARIADB_ROOT_PASSWORD}
volumes:
- ./mariadb_data:/var/lib/mysql
passbolt:
image: passbolt/passbolt:latest-ce
tty: true
depends_on:
- mariadb
environment:
- DATASOURCES_DEFAULT_HOST=mariadb
- DATASOURCES_DEFAULT_USERNAME=passbolt
- DATASOURCES_DEFAULT_PASSWORD=${MARIADB_USER_PASSWORD}
- DATASOURCES_DEFAULT_DATABASE=passbolt
- DATASOURCES_DEFAULT_PORT=3306
- DATASOURCES_QUOTE_IDENTIFIER=true
- APP_FULL_BASE_URL=https://passbolt.mydomain.com
- [email protected]
- EMAIL_TRANSPORT_DEFAULT_HOST=smtp.mydomain.com
- EMAIL_TRANSPORT_DEFAULT_PORT=587
- [email protected]
- EMAIL_TRANSPORT_DEFAULT_PASSWORD=yei5QueiNa5ahF0Aice8Na0aphoyoh
- EMAIL_TRANSPORT_DEFAULT_TLS=true
- [email protected]
volumes:
- ./passbolt_gpg:/etc/passbolt/gpg
- ./passbolt_web:/usr/share/php/passbolt/webroot/img/public
command: ["/usr/bin/wait-for.sh", "-t", "0", "mariadb:3306", "--", "/docker-entrypoint.sh"]
ports:
- 17880:80
Be sure to replace all the email addresses, domain names and SMTP credentials by the values appropriate for your setup.
Now startup passbolt for the first time, it will initialize the database:
docker-compose up
You need to keep passbolt running during the following steps.
First, we’ll send a test email:
docker-compose exec passbolt su -m -c "bin/cake passbolt send_test_email"
If you see
The message has been successfully sent!
then your SMTP config is correct. Otherwise, debug the error message, and, if neccessary, modify the EMAIL_… environment variables in docker-compose.yml and restart passbolt afterwards.
Now we’ll create an admin user:
docker-compose exec passbolt su -m -c "bin/cake passbolt register_user -u [email protected] -f John -l Doe -r admin" -s /bin/sh www-data
If you want to create a normal (non-admin) user, use user instead of admin:
docker-compose exec passbolt su -m -c "bin/cake passbolt register_user -u [email protected] -f Jane -l Doe -r user" -s /bin/sh www-data
After that, the only thing left to do is to create a systemd service to autostart your passbolt service:
curl -fsSL https://techoverflow.net/scripts/create-docker-compose-service.sh | sudo bash /dev/stdin
Passbolt is now running on port 17880 (you can configure this using docker-compose.yml). Just configure your reverse proxy appropriately to point to this port.
You want to install ruby and the gem package manager in Alpine linux, but running apk install ruby rubygems shows you that the package doesn’t exist
/ # apk add ruby rubygems
ERROR: unable to select packages:
rubygems (no such package):
required by: world[rubygems]gem is included in the ruby package. So the only command you need to run is
apk update apk add ruby
Example output:
/ # apk add ruby (1/7) Installing ca-certificates (20191127-r5) (2/7) Installing gdbm (1.19-r0) (3/7) Installing gmp (6.2.1-r0) (4/7) Installing readline (8.1.0-r0) (5/7) Installing yaml (0.2.5-r0) (6/7) Installing ruby-libs (2.7.3-r0) (7/7) Installing ruby (2.7.3-r0) Executing busybox-1.32.1-r6.trigger Executing ca-certificates-20191127-r5.trigger OK: 928 MiB in 154 packages
After doing that, you can immediately use both ruby and gem.
Do you want to install Fedora CoreOS packages without having to reboot your entire system in order for the packages to be available? Just run
sudo rpm-ostree ex apply-live
after running your rpm-ostree install commands.
For example:
sudo rpm-ostree install nano sudo rpm-ostree ex apply-live
Note that this is not completely safe for multiple reasons, not even for seemingly innocuous utility packages like nano:
ex in the command, the apply-live command is experimentalAlso read our previous post on Why do you have to reboot after rpm-ostree install on Fedora CoreOS? where we explain the technical reasoning behind the reboots.
If you have worked with Fedora CoreOS, you might have noticed that every time you install a package you need to reboot in order for the files from said package to be available to you. This is quite different from other Linux distributions where you can immediately use whatever package you installed without having to reboot every time.
rpm-ostree is quite a special tool: It does not just install a package. This has the advantage that the currently running system is not modified at all, but a separate OS tree – image it like an image containing all the files constituting your system – is built after running rpm-ostree install.
While rebooting after every install might seem like a stupid idea since it takes down the entire server, remember that it can save you a lot of headache since there are no partially updated services and you don’t need to manually fix or restart anything since everything is restarted on reboot. This means that your system is always in a consistent state, since every service is cleanly shut down before the system reboot – and after the reboot, every service is cleanly started with the system changes.
Yes, you can run multiple rpm-ostree install commands before rebooting. When rebooting, all the changes will be applied at once.
rpm-ostree install?Yes, there is no need to reboot immediately after the rpm-ostree command. You can delay the reboot as long as you like. Note however, that when the machine is rebooted for reasons other than a manual reboot (like a power outage or restart of the VM host), the updates will be applied as well, but you might not be there to check if all services are running correctly. Hence, I recommend to reboot as soon as possible.
Yes, Fedora CoreOS provides an experimental live update feature using rpm-ostree ex apply-live. See our post How to apply Fedora CoreOS changes without a reboot . Note that applying updates or new packages on a system with productively running services might be a bad idea, but it’s not inherently more unsafe than installing packages on a typical Linux distribution like Debian, Fedora or Ubuntu where every install or update to a package immediately affects the files on the file system.
Just install it using rpm-ostree:
sudo rpm-ostree install docker-compose
and then reboot in order for the changes to the OSTree to take effect:
sudo systemctl reboot
In Fedora CoreOS, you can install the Xen guest utilities using
sudo rpm-ostree install xe-guest-utilities-latest
After installing the package, reboot in order for the changes to take effect:
sudo systemctl reboot
Now we need to enable and start the Xen service:
sudo systemctl enable --now xe-linux-distribution
It will now automatically start on boot.
Example output from the install command:
# rpm-ostree install xe-guest-utilities-latest Checking out tree 49ec34c... done Enabled rpm-md repositories: fedora-cisco-openh264 updates fedora rpm-md repo 'fedora-cisco-openh264' (cached); generated: 2020-08-25T19:10:34Z rpm-md repo 'updates' (cached); generated: 2021-05-13T01:04:01Z rpm-md repo 'fedora' (cached); generated: 2020-10-19T23:27:19Z Importing rpm-md... done Resolving dependencies... done Will download: 1 package (1.0 MB) Downloading from 'updates'... done Importing packages... done Checking out packages... done Running pre scripts... done Running post scripts... done Running posttrans scripts... done Writing rpmdb... done Writing OSTree commit... done Staging deployment... done Added: xe-guest-utilities-latest-7.21.0-1.fc33.x86_64 Run "systemctl reboot" to start a reboot
If you want to use the German keyboard layout in the Fedora CoreOS installer, set the de keymap using:
sudo localectl set-keymap de
They new keymap will be effective immediately.
Note that the keyboard layout will not automatically be transferred to the installed system.