Ansible: ad-hoc commands
Ansible is not usefull only to run large complicated playbooks, its also usefull when you want to run simple commands on group of servers.…
$ whoami — Konstantinos Patronas
How to start with ansible
In this article i will show you how to install and configure ansible and how to run a basic playbook.…
How to check if a port is open and you dont have telnet or nc installed
In some environments you might not be able to install telnet or nc to verify if a port is open, but still using standard linux commands……
Docker swarm: overlay network encryption and MTLS
To encrypt application data, add --opt encrypted when creating the overlay network. This enables IPSEC encryption at the level of the……
Docker content trust: how it works
Docket content trust is a security mechanism that allows only images with a specific sign to run to our docker environment. This ensures……
Docker networking explained
Docker utilizes n architecture called Container Network Model (CNM) to manage container networking.…
rsync examples: how to resume your interrupted copy and how to copy over a third host
How to copy a file/directory from a host to another who can communicate only by a 3rd host (Jump Host)…
Docker swarm and remote filesystems, an ssh fs example
Scenario: we have a swarm of 3 servers and a 4th server which will be our storage, a directory on this host that will be mounted over ssh…
Docker: see images size and how to clean-up
Docker images takes space in filesystem, lets do a test to get a better understanding, create the following Dockerfile…
Docker — bind mounts and volumes
If your application requires data persistence after the container have been deleted docker offer two options to store data, volumes and……