DevOps

Install and update vault license. ...

Alter default SOGo refresh view interval for specific user. ...

Wait for service activation during Ansible playbook execution. ...

Determine ZooKeeper version using command-line utilities. ...

Use Cloudflare’s PKI and TLS toolkit to check online certificate. ...

Use Cloudflare’s PKI and TLS toolkit to quickly generate self-signed certificates. ...

Generate new vault keys. ...

Enable HashiCorp Vault audit logs. ...

Generate new vault root token. ...

Use HAProxy to redirect connection to active HashiCorp Vault cluster. ...

Create directory with defined ownership and permissions using a simple single-step command. ...

Extract and parse LXD instance information. ...

Reload consul configuration. ...

Change encryption key used for gossip messages. ...

Inspect current consul metrics. ...

Inspect remote GnuPG signing key. ...

Enumerate vault root tokens. ...

Ensure that HAProxy keep up with Docker name resolution. ...

Install and configure HashiCorp Vault agent. ...

Inspect consul configuration using command-line utilities. ...

Inspect vault configuration to troubleshoot potential problems. ...

Lookup specific element in Ansible dictionary or list of these. ...

Use go-sockaddr template to define IP address inside Consul configuration. ...

Create a software watchdog for systemd service. ...

Prevent updating VirtualBox Guest Additions on the guest system when using Vagrant. ...

Automatically update docker containers whenever new image is released using watchtower. ...

Install guest tools inside XCP-ng VM for better performance and various features. ...

Fix pkeys are immutable on OpenSSL error inside Vagrant on Ubuntu Jammy Jellyfish. ...

Use Docker or Pod Manager multi-stage build to compile Nginx from source code with additional headers-more-nginx-module module using Debian Bullseye image. ...

Inspect ZooKeeper logs and snapshots. ...

Debug ZooKeeper SSL connection issues. ...

Use specific Vagrant box version instead of the latest one. ...

How to remove old ZooKeeper snapshots and transaction logs. ...

Secure the ZooKeeper client communication. ...

Secure the ZooKeeper quorum communication using SSL certificates. ...

Determine and restore preferred leader for specific Kafka topic. ...

Inspect Kafka broker configuration using command-line utilities. ...

Determine Kafka version using command-line utilities. ...

PKCS #12 format works fine when used to provide ZooKeeper keystore, but additional steps are needed to use it for a dedicated truststore. ...

Execute multiple Ansible tasks once per group and use a dedicated variable to store custom data. ...

Manage Kafka topics using command-line utilities. ...

Distribute data evenly across all disks on a Hadoop datanode. ...

Display ZooKeeper state for each server using the four-letter commands. ...

Update reconfigurable properties on Hadoop node without restart. ...

Wait until service is stopped or running inside ansible playbook. ...

Use JSON-based configuration format for Hadoop datanodes to create a whitelist and control put these in normal, decommissioned or maintenance state. ...

Reassign Kafka topic partitions. ...

Rebalance data across HDFS cluster. ...

Alter memory allocation pool for Kafka and ZooKeeper. ...

Define cluster groups in Ansible inventory. ...

Disable GC Logging for Kafka and bundled ZooKeeper. ...

Query Docker socket using curl. ...

Configure Grafana application within GitLab instance to accept self-signed certificate. ...

Install GitLab runner on Raspberry Pi. ...

Delete every Kafka message or messages up to the specific offset. ...

Use command-line utilities to extract Kafka topic parameters. ...

Debug ZooKeeper connection inside a Python script. ...

Install GitLab on Raspberry Pi. ...

Install LXD a next generation system container and virtual machine manager on Raspberry Pi using DietPi a highly optimized minimal Debian OS. ...

Fix broken Prometheus service in GitLab arm64 14.4.2. ...

Reset offset of Kafka consumer group. ...

Perform basic console operations on Kafka cluster. ...

Display active Kafka brokers using command-line utilities. ...

Inspect and improve docker image using dive utility for exploring each layer in a docker image. ...

Install and configure a Kafka cluster without ZooKeeper to play with it. ...

Install and configure a Kafka cluster with ZooKeeper to play with it. ...

Generate Kafka cluster ID for Kafka Raft metadata mode. ...

Use ZooKeeper to elect the leader and share data with a Python script. ...

Use ZooKeeper to lock resources with a Python script. ...

Enable the four-letter words. ...

Provide additional JVM options to the ZooKeeper instance. ...

Display ZooKeeper startup options. ...

Execute ZooKeeper commands using command-line interface. ...

Enable ZooKeeper audit logging. ...

Install and configure a basic ZooKeeper cluster to play with it. ...

Install standalone ZooKeeper server to play with it. ...

Squash Docker image to remove unnecessary layers in case you do not have a need to keep them. ...

Enable Control Group v2 for podman to display container’s resource usage statistics. ...

Build DokuWiki container with podman. ...

Use docker-compose to instantly setup a development WordPress instance. ...

Deal with missing snapshot after ZooKeeper upgrade from version 3.4 to 3.5 or later. ...

Install Cluster Manager for Apache Kafka, previously known as Kafka Manager on Debian Bullseye. ...

Solve the issue related to the high user id in a dockerfile. ...

Create Ansible filters to work with Apache Flume configuration. ...

Dynamically route HTTPS traffic to LXD instances on a development server. ...

Define multiple disks inside Vagrant using VirtualBox provider. It is not immediately obvious how to achieve it, but everything you need is there. ...

Display custom message after the vagrant machine is started. ...

Use vagrant provisioner to update SSH authorized_keys every time the virtual machine is started. ...

Disable concurrent builds in Jenkins declarative pipeline. ...

Create an additional Ansible role to dynamically set Ansible SSH user depending on the defined conditionals. ...

Use a Python package installer to display available versions of the specific Python package. ...

Install Nexus Repository Manager (NXRM) 3. ...

Use Checkpoint service to check the HashiCorp software version. ...

Use specific environment variables to enable and store detailed terraform execution logs. ...

I have already described how to combine group variables by parsing group configuration files, so today I will describe how to combine group variables with specific names. ...

Define build name and description in Jenkins pipeline. ...

Display Ansible configuration settings that have changed from the default. ...

Use a dedicated option to display Java settings. ...

Ignore the browser’s language preference and set the specific language in Jenkins. ...

Access required ansible facts regardless of the target limits on a particular run. ...

Inspect and solve non-obvious lack of free space when using lxd snap. ...

Configure the Vagrant virtual machine to use a specific proxy using the vagrant-proxyconf plugin. ...

Alter task history retention inside the Docker Swarm cluster to ensure that there are no stopped containers. ...

Execute the old and new Terraform using the selected provider in an offline mode. ...

Create a MongoDB cluster using Docker. ...

Create a MongoDB container with a designated user. ...

Inspect and redeploy the master certificate in OpenShift 3.11. ...

Replacing the router certificate in OpenShift 3.11 is easier than you think. ...

Use AdoptOpenJDK/Eclipse Adoptium to install OpenJDK 8 (LTS)/OpenJDK 11 (LTS) or OpenJDK 15 (Latest) using Eclipse OpenJ9 or HotSpot Java virtual machine. ...

Define the environment variable to use specific Vagrantfile. ...

Docker services are not automatically rebalanced after events that affect Docker Swarm nodes, so you have to initiate this process yourself. ...

Create an Elasticsearch cluster using docker to learn how it behaves during specific operations. ...

Deploy Portainer stack inside the Docker Swarm cluster. ...

Install Kubernetes on LXD. Essential information to just get you started. ...

Start using Docker Swarm to easily manage your containers. ...

Update the docker-compose configuration file to reduce the container log file size before you run out of disk space. ...

Today I will describe how to deal with missing AppArmor profiles for microk8s on LXD. ...

Instruct Ansible to use a specific version of Python interpreter on the remote host. ...

Parse INI configuration file using Bash shell-script. ...

Sometimes it makes me wonder whether I am inside a chroot environment or not, so let’s check it out. ...

LeaseWeb released a new version of API that will deprecate the old one, so it is the perfect time to update the Python script using v1 api and switch to API v2 before May 31. ...

Setup a simple Docker registry to use it privately or share images which a team of developers. ...

Create a base Docker image using debootstrap utility. ...

It is a good practice to not use valid domain names or already assigned IP addresses while writing documentation. I will provide you with RFC documents that are needed to reduce the likelihood of conflict and confusion. ...

It is time to mention about simple sequential or simultaneous upgrade process on lxd guests. It is adapted to Debian-like operating systems using apt as I am using these daily. ...

Use Python script to verify that client can connect to the RabbitMQ message broker. ...

Use a defined webhook to post a message from the command-line as a parameter, standard input, or a file into Slack/Mattermost. Take advantage of colors, icons, and markdown to enhance your message. ...

Vagrant is an awesome piece of software, but constantly downloading system packages can be very time-consuming. The simplest solution is to set up an apt caching proxy as a Vagrant box. ...

Today, I will publish Vagrant configuration to set up DokuWiki instance. It is just a handy reference, as described in the earlier blog post. ...

I have successfully used Google Drive and Insync to organize all of the e-books that I have acquired during the last years. Currently plan to upload them to a personal DokuWiki instance since I use it more every day. Before I can start, I need to extract cover images to ensure that I will get a decent outcome. ...

Today I will shortly describe how you can remotely check the PostgreSQL version and use it inside shell scripts. This ability comes in handy at times, as it can be used to perform different tasks depending on the returned database version. ...

There are two ways to non interactively provide a password for the psql command (PostgreSQL interactive terminal). Each method allows you to quickly write shell scripts using terminal-based PostgreSQL utilities as you can provide user credentials from the password file or environment variables. ...

At the beginning of the last year, I wrote about VirtualBox image conversion. Today, I will continue this topic further and describe how to control the virtual machine using the command line. ...

Recently I was wondering if it would be possible to automate mouse and keyboard actions. The answer is obviously yes as you can use xautomation and xdotool tools. I will describe them in a couple of simple examples. ...

The easiest way to remove comments from a shell script is to use sed (stream editor for filtering and transforming text) command. ...

Quick Response Codes are appearing everywhere. You can see them in museums, near the tourist attractions or all over the web. There is no doubt that QR Codes are useful as they can contain any information within reasonable limits. ...

To use a physical hard disk in VirtualBox you need to create an image that will represent it. ...