org.apache.jasper.JasperException: java.lang.IllegalStateException: No output folder

This error can happen on Linux and Windows, and the cause could be the same. On Windows Server 2012R2 I opened a command prompt. To be able to delete a directory from the Tomcat webapps folder, I have issued the shutdown command. When I started the server with the startup command, and navigated to my local […]

How to create a Docker repository in Artifactory

Artifactory supports multiple repository types, Docker is one of them. To create a new Docker repository in Artifactory Set the Custom Base URL of the Artifactory server From the Artifactory documentation at https://www.jfrog.com/confluence/display/RTF/Configuring+NGINX “When using an HTTP proxy, the links produced by Artifactory, as well as certain redirects contain the wrong port and use the http instead […]

`pwd’: No such file or directory – getcwd (Errno::ENOENT)

When you rename a subdirectory under the directory where your Linux or MacOS terminal is open you may get the error message /opt/chefdk/embedded/lib/ruby/gems/2.4.0/gems/chef-13.4.19/lib/chef/knife/cookbook_download.rb:45:in `pwd’: No such file or directory – getcwd (Errno::ENOENT) You need to refresh the directory cache of the terminal. Go one level higher cd .. Go back to the directory cd MY_DIRECTORY […]

Migrate a WordPress web site to DreamHost

DreamHost is one of the recommended WordPress hosting providers. The DreamHost website has an extensive knowledge base, but the necessary steps to move your live site from another provider are scattered over multiple pages at https://help.dreamhost.com/hc/en-us/articles/214693178-How-to-manually-migrate-WordPress-to-DreamHost. These steps will guide you through the streamlined migration process. At your old provider Create a site and database […]

Failed to complete #create action: [undefined method `version’ for nil:NilClass] on …

When you execute kitchen converge to launch an EC2 instance in AWS with Chef Test Kitchen, you get the error message: >>>>> ——Exception——- >>>>>> Class: Kitchen::ActionFailed >>>>>> Message: 1 actions failed. >>>>>> Failed to complete #create action: [undefined method `version’ for nil:NilClass] on … >>>>>> ———————- >>>>>> Please see .kitchen/logs/kitchen.log for more details >>>>>> Also […]

Vagrant installation

 Vagrant Installation Warning! The new versions of Vagrant delete the contents of the /opt/vagrant directory. If you want to keep old versions of Vagrant, first move them out of the /opt directory. Download Vagrant from https://www.vagrantup.com/ and follow the instructions to install it. Select DOWNLOAD… Select the operating system of your workstation. For Ubuntu: Debian RedHat: Centos […]

Ubuntu gets stuck in a login loop

When I rebooted my Ubuntu machine it started to repeatedly ask for the password. When I entered the correct password, the screen went black and asked for the password again. The problem was an error in the ~/.profile file. To log into the Ubuntu terminal Press the Ctrl-Alt-F3 key combination Enter the username Enter the password […]

DevOps Engineering part 1. (Ubuntu) – Install the DevOps development tools on Ubuntu

DevOps Software installation on Ubuntu There are multiple ways to install software on Ubuntu Install a .deb package from the local drive with dpkg Install the software from the internet with apt Show hidden files To be able to see hidden files in Files Start Files, In the Edit menu select Preferences, On the Views tab check […]

Configure the Ubuntu virtual machine in VirtualBox

Enable shared folders on the virtual machines To be able to use shared folders between the host ( your workstation ) and the virtual machine. Start the Ubuntu virtual machine in Virtual Box, Select the virtual machine window on your workstation, In the Devices menu of Virtual Box select Insert Guest Additions CD image… Click the Run button, […]

Configure the Windows virtual machine in VirtualBox

Enable shared folders on the virtual machine To be able to use shared folders between the host ( your workstation ) and the Windows virtual machine. Start the Windows virtual machine in VirtualBox, Select the virtual machine window on your workstation, In the Devices menu of VirtualBox select Insert Guest Additions CD image… In the virtual machine start Windows Explorer, […]