DevOps – Server and Technologies and virtualization

/DevOps - Server and Technologies and virtualization

This category deals with everything related to Linux servers and technology issues of web hosting.
Most likely this will be DevOps centered, with focus on the operational part and virtualization (VMWare product stack).

Copying files from a Docker container to your host system

Just a short reminder, as I use this blog also as my digital brain: To copy files from a docker container to your host, one can use: sudo docker cp <your containerId>:/path/in/container /localhost/path/target Of course, you can define already in the Dockerfile, which files should be added to a container, but this way, one can [...]

2019-01-03T16:47:19+01:00Tags: , , |

Cleaning up while playing with Dockerfiles

As I play around a lot with Docker these days, I recognized how fast one is running out of hard disk space while building and running a lot of Dockerfiles. When one starts with using Dockerfiles there is a lot of trail and error until the expected services are running properly. In my case, I [...]

2019-01-03T16:47:20+01:00Tags: , , |

Wrong character encoding using Putty

I am quite often using Putty to connect to my server systems. I just recently recognized, while using "tree", that the character encoding was wrong while connecting to one of the machines. For instance, when I run "tree" on the command line, it will look like the following: seiler@docker:~/dockerfiles$ tree . âââ datacontainer âââ mysql âââ [...]


Creating a REST web service with Python for serving TinkerForge sensor data in JSON

This tutorial is demonstrating one solution to serve data read from TinkerForge sensors via a REST web service. It is implemented utilizing Python on a Fedora Unix (for ARM) running on a Cubietruck. It is not handling the basics of connecting to TinkerForge hardware, as this is covered quite well on their homepage. About REST [...]

2019-01-03T16:47:21+01:00Tags: , , , , , |

Moving cubietruck Linaro to a „real“ hard drive

In this guide I will record the steps I completed to move the rootfs to a SSD harddrive. When your hard disk is connected to your cubietruck power on and connect via Putty (or control directly via keyboard). Check, if the hard disk was found and what kind of partitions are available: seiler@cubietruck:~# sudo fdisk -l [...]

2019-01-03T16:47:23+01:00Tags: , , |

Call to undefined function apc_fetch()

I just stumbled upon an error in one of my clients web spaces. The costumer is running a presta shop on his web space and encoured an error in form of the "white screen of death". While taking a look to the server logs I encountered a repeating error about [Mon May 05 22:34:06 2014] [warn] [...]

2019-01-03T16:47:25+01:00Tags: , , , |

Wireless Lan with WPA2 on the Cubietruck (Fedora)

This short tutorial will introduce how to set up Wireless Lan on a Fedora-driven Cubietruck. The aim is to load the necessary module and set-up the connection to a Wireless network during system startup automatically. First of all, the module for the Broadcom AP6210 chipset (offering Bluetooth and Wireless functionality) must be added to the [...]

2019-01-03T16:47:26+01:00Tags: , , |

Definition of Remote, Online, Virtual, Simulation and Distance Labs

In the literature, various terminologies are used for describing remote accessible or virtual online experiments. To avoid confusion this article discusses these terms before the principal section. Distance Labs A Distance Lab is a web platform offering any kind of online accessible experiment. This can be a remote or a virtual lab. These two kinds [...]

2019-01-03T16:47:27+01:00Tags: , , , , , , |

Installing Lubuntu 1.02 on Cubieboard 3

I just got new hardware to play around with - a Cubietruck / Cubieboard 3 that I will use as an application server in the near future. First of all we will set up a Linux system called Lubuntu Server on the Cubieboard 3. After that we are going to install additional software, like Apache [...]

2019-01-03T16:47:27+01:00Tags: , , |