Debian Buster

Use system performance tools for Linux to display process statistics. ...

Manage systemd services remotely over SSH protocol. ...

Use sponge utility to read standard input and safely write it out to the same file. ...

Fix “device excluded by a filter” LVM error. ...

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

Monitor file system events to restart service on every configuration change. ...

Use JUnit callback plugin to store and Allure Framework to visualize ansible playbook events. ...

Use numfmt command-line utility which is a part of the standard GNU Core Utilities to pretty print decimal or binary numbers. ...

Use varnishlog to log specific Varnish requests. ...

Varnish Shared memory Log can put a major strain on the disk (I/O write operations). The solution is to store it on the virtual memory filesystem. ...

Use needrestart utility to determine which services need to be restarted after the upgrade. ...

Install the Advanced Open Source Enterprise Wiki. ...

Use FUSE (filesystem in userspace) to access rdiff-backup repository. ...

Execute rc.local shell script during boot using systemd compatibility generator. ...

Perform shell script analysis using shellcheck, a shell script static analysis tool. ...

Calculate Elasticsearch’s average documents number in recent days using a shell script. ...

Use systemd service to automatically extend existing ext4 filesystem on boot or on-demand to optimize virtual machine configuration. ...

Retry Elasticsearch shard allocation that was blocked due to too many subsequent allocation failures. ...

Calculate Elasticsearch hit ratio using command-line curl utility. ...

Delete old Elasticsearch indices using Elasticsearch Curator utility. ...

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

Specify a custom SSH port when using rdiff-backup. ...

Create swap file to optimize virtual machine configuration or just immediately increase available swap space. ...

Automatically clear GNU Bourne-Again SHell history when you exit a login shell. ...

Display default Elasticsearch settings. ...

Limit bandwidth on specific network interface using wondershaper. ...

Test TLS/SSL encryption anywhere on any port ...

Query and change the system hostname. ...

Keep track of network latency using SmokePing on Debian Buster. ...

Inspect RabbitMQ settings using command-line. ...

Use basic linux command-line utility to calculate real disk capacity. ...

SmokePing 2.7.3 needs an update to use the SSH probe on Debian Buster. ...

Create custom Bourne Again SHell package to disable network redirections and enhance system security. ...

Use templates to define default Elasticsearch index settings. ...

Undo undo fsck operations performed on the Ext4 filesystem. ...

Reindex directories located in the Ext4 filesystem after removing a huge number of files to optimize directory sizes. ...

Use simple HAProxy configuration hacks to serve a single static file. ...

Merge multi-process HAProxy statistics using GNU Awk. This is a duct tape solution, as you should definitely use Lua. ...

Merge multi-process HAProxy statistics using Lua. ...

Distribute messages to different RabbitMQ node using federation plugin. ...

Move messages to different RabbitMQ node using shovel plugin which acts as a simple client. ...

Copy messages to different RabbitMQ node using federation plugin. ...

Find out whether remote port is open using Bourne Again SHell network redirections. ...

Mirror RabbitMQ queues cluster to replicate configuration across multiple nodes. ...

Create RabbitMQ cluster to replicate configuration across multiple nodes. ...

Display active Elasticsearch searches and calculate average value. ...

Use rabbitmq_top plugin to display RabbitMQ Erlang processes. ...

Unmount not accessible NFS share that still has open files. ...

Log every executed command to syslog. ...

Install CouchDB on Debian Buster. ...

Use RabbitMQ Management API to export or import configuration. ...

Reset RabbitMQ node configuration. ...

Generate password hash for CouchDB administrator. ...

Display RabbitMQ/Erlang version using essential utilities. ...

Ensure that specific service is started after the system time has been synchronized. ...

Specify systemd startup timeout option to prevent service start operation from timing out. ...

Modify systemd service configuration by using drop-in files, which is useful for automation when using ansible or any other provisioning, configuration management, and deployment utility. ...

Perform basic Elasticsearch 7.x operations. ...

Install Elasticsearch 7.x on Debian Buster. ...

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

Node name is by default part of the location where the RabbitMQ data is stored, so you need to explicitly define static location to ensure that RabbitMQ data is always available in these rare cases when there is a possibility of node name change. ...

Specify RabbitMQ node name to use your own prefix or particular hostname. ...

Use HAProxy stats socket to determine current application status. ...

Access your files stored in OneDrive using rclone command-line program to sync files and directories to and from cloud storage and FUSE Filesystem in Userspace filesystem. ...

Suppress message of the day for specific or multiple users. ...

There are use cases where you need to know which backend server is used, so use specific header to send target server name to backend. ...

Manage and display system news using a simple but effective utility. ...

Handle domains that are not defined in the configuration using dedicated backend. ...

Display LWN news using the message of the day framework. ...

Install Restyaboard, an Open Source Kanban board. ...

Protect the operating system against accidental shutdown or reboot. ...

Display message of the day after successful login. ...

I have already described how to create VLAN interface, but things have changed over time, so I decided to update the know-how. ...

Get and display RabbitMQ uptime measured in seconds using three different methods. ...

Install RabbitMQ message broker to queue and exchange messages. ...

Use dedicated command-line utility to convert various units to different measurement systems. ...

Use to drctl-tools to parse Debian package information using the Debian control file format (the dctrl format). ...

What does “Release file for […] is not valid yet (invalid for another […]). Updates for this repository will not be applied.” error mean? ...

Create persistent sysctl configuration using standard system utilities. ...

Quickly fix fusermount: exec: "fusermount": executable file not found in $PATH by installing missing Filesystem in Userspace package. ...

This is an extension to an older blog post on how to mount WebDAV share using systemd as this proved to be a very reliable method that is easy to mark as a dependency for other services. ...

RabbitMQ uses Bintray to provide official repositories for RabbitMQ message broker and Erlang, but there is a small catch as at this moment repository for Debian Buster does not contain RabbitMQ application… ...

Modify system identification message that is printed before the login prompt. ...

Update the system time using systemd as a NTP client. ...

Create Argo Tunnel to expose internal service and securely access it over the internet. ...

You already know how to collect and report system activity information, so it is the best time to learn how to export already collected data. ...

I have recently updated Debian Buster from testing to stable, so it is worth to note how to perform such update non-interactively. ...

Use netstat, ss or files inside proc filesystem to count TCP connections. ...

Collect and report system activity information using sysstat a system performance tools for the Linux operating system. ...

Download OpenVPN configuration using public NordVPN API to specific file. ...

Display your external IP address using public NordVPN API. ...

Today, I will show you how to get and display user details using a shell script. This work is based on a Python-based solution by David Green and located at bitbucket/nordapi. ...

Perform a dictionary attack on the forgotten LUKS passphrase to access the encrypted device. ...

In a blog post a month ago, I described how to use a terminal to display servers recommended by NordVPN, but the same result can be achieved by using public API service. It is not officially documented, so let’s play with it. ...

Use NordVPN command-line utility to easily manage VPN service. ...

I have already described a simple way to manually configure Network Manager and automatically import NordVPN servers, so today, I will explain how to pretty print servers recommended by NordVPN using terminal instead of web-browser. ...