Hacking. Wi-Fi Deauthentification attack on MacOS
Probably all Apple computers with wireless cards are capable to use monitoring and de-authentication mode. BetterCAP is an amazing, adaptable, and convenient...
Categories
sysad
DELL. Upgrade firmware on Dell S4048 switch (S-series, OS9)
Instructions for upgrading the last firmware of Dell Networking system.
DELL. Disabling SupportAssist on switch
SupportAssist is a daemon for sending technical reports to Dell servers. It enables by default. Here we disable this unwanted feature (and may be unsecured).
DELL. Setup SSH server on OS9 switch (S4048 10G switch)
Setup and configure ssh server on Dell Networking system with RSA and password authentication.
DELL. File Management on S4048 switch (OS9-series system)
Some useful notes for working with files (save, copy and transfer) on Dell Networking system.
Hacking. Wi-Fi Penetration on MacOS
Today I want to show how to crack WPA/WPA2 passwords on MacOS. It took me 20 minutes to hack a password with 8 digits. My methods based on airport, aircrack-...
ESXi. Create and configure Management Network using ESXi Command line
This quick post about ESX CLI networking basics. Here is should be useful to recover the Management Network functionality on your ESXi host.
DELL. CLI commands
Here is a list of basic CLI commands which will help you manage your Dell PowerConnect series switches.
ESXi. NTP Configuration
How to configure date and time using NTP on a Vmware ESXi server.
Proxmox. Remove subscription notice
Removing madden subscription notice and disabling PVE repository from apt-update list.
ESXi. Enabling Nested virtualization
Configure ESXi for allowing Linux guest run VirtualBox/KVM/Proxmox and create a nested guests.
Setup VLAN interface on CentOS
There is a short instruction to configure VLAN interface in CentOS sytem with ip command.
Supermicro IPMI default password
The default username and password of Supermicro IPMI has been posted in this.
ESXi. The command line and shell magic
Sometimes you don’t have access to ESXi by WebGUI. You might need to restart a server remotely via SSH or direct console. In these cases it’s great to be abl...
ESXi. The best way to build VPN tunnel with pfSense
ESXi is good and reliable tool to run VMs on bare metal. It is configuring by webGUI. But the host with ESXi can be accessed only through NAT without any pub...
Install and configure NTP on FreeBSD 11
In this article will be described what use NTP to synchronize system time on FreeBSD. I use FreeBSD 11 that ran as VPS in Hetzner cloud.
devops
DELL. Configure Dell 10 gigabit switch with Ansible
Use Ansible playbooks to easy configure Dell Networking OS9 system. The post contains many practical examples of using dellos9 modules
Docker. Create secure web service using Let’s Encrypt with Traefik
Deploying web services to public network usually requires to set up secure connections using SSL certificates. With Docker you can easily make it using anoth...
Traefik. Concept term explanation
Traefik is a load balancer and HTTP reverse proxy that makes working with microservices. It has good interfaces to integrate with containers and orchestratio...
Selenoid. Selenium in Docker
Selenoid is a server, that launches isolated browsers within Docker containers. All browser processes are fully isolated. This allows launching an unhindered...
Dockerfile. ARG and ENV statement differences
The both words use for define variables in to Dockerfile. It may be difficult to understand the difference, but it will be explained here.
GitLab CE in Docker. External OAuth2 Authorization
GitLab allows to sign up and login with many external application like Google, Facebook, Github. Also a custom OAuth provider supported by a internal library...
GitLab CE in Docker. Disable HTTPS
GitLab CE enable https and Let’s Encrypt certificates by default. What to do if it no needs? How to disable listening 443 TCP port.
GitLab CE in Docker. Deploying
A good team of software development doesn’t exists without a code repository manager system. GitLab is the most popular and reach functionality system. This ...
Ansible. My preferred modules
Ansible ships with a number of modules (module library) that can be executed directly on remote hosts or through Playbooks. Modules are the ones that do the ...
Ansible. Getting started
In this post I will speak about installation and configuration the remote and control machine for running basic commands and the first playbook.
Ansible. Architecture
Ansible is an automation engine that automates cloud provisioning, configuration management, application deployment, intra-service orchestration, and many ot...
Ansible. Why I use it?
As a sysadmin I often connect to servers that run the same commands by SSH. This is could be update packages, edit configures, copy files or some other thing...
GitLab CI/CD. Create simple pipeline
With using CI/CD pipelines in GitLab project you can easily build, test and deploy your code. This post will describe how to make it step by step.
GitLab CI/CD. Install and configure Runner
GitLab uses Runners for a running scripts that defined in your CI pipeline. A Runner is a daemon that hosted in your servers. It waits commands from GitLab ...
GitLab CI/CD. Main concepts and terms
Before we will create the first pipeline with GitLab CI we should understand what pipeline is it. I want to explain main terms in this post.
GitLab CI/CD
GitLab CI/CD takes many benefits for companies that want to automate software development workflow. I use it in my practice for a long time and want to docum...
linux
CentOS 8. Podman installation and basic usage
Now that official support for the Docker container runtime has been dropped by RHEL 8/CentOS 8, what are container admins to do? The solution is called Podma...
CentOS 8. Automated installation using Kickstart
You can install CentOS 8 automatically using a Kickstart file. The file has the answer to all the questions that installer asks when you manually install it....
RHEL8. Install to DELL server with RAID (SAS2008)
In RHEL/CentOS 8 was be removed many drivers for popular enterprise raid-controllers. It brings some troubles when you try to install OS. Without drivers an ...
Installing Jekyll on Fedora 30
Jekyll is simple static site generator that focuses on blogs, but can be used for all kinds of sites. This blog uses Jekyll as base. And this post show comma...
Installing HAProxy on pfSense with SSL access to web server
When you use pfSense as firewall often you want to protect you local resources form external threats. Also pfSense used as router to transfer local and exter...
Installing Let’s Encrypt SSL Certificate with pfSense
The ACME Package for pfSense interfaces with Let’s Encrypt to handle the certificate generation, validation, and renewal processes. The connection will be en...
Work with host system in Hetzner Rescue Mode
Hetzner Rescue Mode allow to repair host system when you cannot access in usually way. In this post I will show how to mount LVM volume and to change a some ...
Tasks of Linux contest in IT-Planet
IT-Planet is an international olympiad for students and young specialists in IT. I participated in the contest of Linux Administration and I became one of th...
Create daily database backups with Borg
This article shows how to create backups of your data from PostgreSQL DB to a remote server with a secure and effective approach
Upgrade CentOS 7.x to latest version
The latest version of a system has latest bug fixes and new opportunities and in this article will be showed how to update CentOS 7
Upgrade kernel of CentOS 7 to latest version
The Kernel is the brain for an operating system. It’s like the core element of every OS. Some popular OSs that use the Linux kernel are Ubuntu, CentOS, and D...
MySQL Master-Slave replication with a Docker
In this article was described a simple configuration of MySQL Master-Slave replication with using Docker containers.
Add a free SSL certificate to NGINX server
In this article I will show you how to use the certbot Let’s Encrypt client to obtain a free SSL certificate and use it with Nginx on CentOS 7. I will also s...
dev
Web Automation. Selenium WebDriver and Python
Selenium is an open-source web-based automation tool. It can be used for many purposes: to test designed web applications, to scrapping content from web page...
Git. Squash Multiple Commits in to One Commit
This note shows how to merge an ugly feature branch with multiple dirty WIP commits back into the master as one pretty commit.
Jekyll. Example post with many types of content
A variety of common markup showing how the theme styles them.