I installed OpenStack Mitaka and was curious to check various features in horizon dashboard. For instance, the System > Hypervisors menu in the dashboard provides summary of various compute hosts, its hypervisor type and usage details – where I was surprised to see Hypervisor type reported as QEMU and not…
While installing OpenStack Mitaka horizon module, I was stuck with an error processing package openstack-dashboard-ubuntu-theme. Below is the snapshot of the complete error message. # apt-get install openstack-dashboard Error: apache2_invoke: Enable configuration openstack-dashboard.conf apache2.service is not active, cannot reload. invoke-rc.d: initscript apache2, action “reload” failed. Setting up openstack-dashboard-ubuntu-theme (2:9.0.0-0ubuntu2.16.04.1) … dpkg:…
If you are stuck with an error Cannot add a NOT NULL column with default value NULL while populating or syncing neutron database, then here’s how you can fix it. Before we see the solution, have a look at the snapshot of the error: # su -s /bin/sh -c “neutron-db-manage –config-file…
If you are getting an error while syncing or populating database of services such as Keystone, Glance, Nova and Neutron, then here’s what I did to fix it. Before that, have a look at the snapshot of the error thrown while executing keystone-manage db_sync and glance-manage db_sync commands. However, the same error…
I generally use setup or system-config-firewall commands to configure firewall in CentOS machines. But the same commands in CentOS 7 failed with an error message ERROR: FirewallD is active, please use firewall-cmd. $setup ERROR: FirewallD is active, please use firewall-cmd. ERROR: FirewallD is active, please use firewall-cmd. The above error…
Annoyed of advertisement banners in uTorrent application? It’s quite easy to disable it. All you need to do is, click on the Settings gear icon to open Preferences dialog and click Advanced from the tree menu in the left sidebar. In the right, search the below attributes (one at a…
What happens if you forget your MySQL root password? No worries, the below steps will help you to reset mysql root password using options ‘–init-file’ and ‘–skip-grant-tables’. Option 1: Reset MySQL root password using –init-file option Step 1: Kill mysqld process #killall mysqld Step 2: Create a new mysql-init (I’ll call…
Question: I was installing few OpenStack packages on Ubuntu 14.04.4 LTS and landed up with an error Unable to correct problems, you have held broken packages. However, this error seems to occur for any package installation. Below is the detailed error message. # apt-get install python-sqlalchemy python-nova Some packages could not…
Do you want to search and replace a particular URL or text or an image in WordPress post contents? For example, I recently switched my WordPress site from ‘http’ to ‘https’ protocol and left with few issues. One of the issue is – most of my old posts were embedding…
Blurring text or an image in Microsoft paint application in Windows? The world knows, that there’s no Blur tool in Microsoft Paint. Of course true, but it does not mean that you cannot blur text or an image in MS paint. Here’s a simple trick to do that. Blur effect…
The Skype app for Windows was updated and the new banner ads started appearing and the worse part is there’s no option in the Settings to disable it completely. The banner ads appears in the sidebar when ‘Compact Sidebar View’ is enabled and at the top in ‘Split Window View’….
I recently observed that Google Chrome in Android (5.1) is not showing the website’s full URL. For example, when a particular page is visited in a website (say techglimpse.com/page.html), Google Chrome hides the full page URL and shows only the domain name (as techglimpse.com). According to the reports, it’s an…
CloudSim is an extensible simulation toolkit for modelling (including both the system and behavior modeling) and simulating cloud computing environments. It’s a powerful toolkit and can be integrated with Eclipse or NetBeans Java IDE’s. Today, we will learn about CloudReports – a graphical user interface that allows you to simulate distributed…
Question: I have been using YARPP WordPress plugin for displaying related posts in my website. The plugin comes with options such as List, Thumbnails and Custom. I tried using both the List and thumbnails display options, but the Custom option was disabled and when the mouse is moved over, the tooltip…
Recently, I received an optimization tip from Google Adsense which suggested to try out the new Page-Level ad formats for mobile devices. The Page-Level ad formats are optimized to only appear when they’ll perform well on your website and seems to provide a good user experience (well, I just started to…
How annoying when you see a tweet posted on to your profile without your permission? My friend does not tweet much, but at least once in two months I see a tweet posted on her account that says “I have been on Twitter for # of years and # of months. And…
Question: I was trying to upload a PDF file of size 2MB in MediaWiki and hit with 500 internal server error and this error seems to occur whenever I upload a larger file. I quickly verified php.ini, which had the below values: upload_max_filesize = 32M post_max_size = 20M and below is…
If you ever want to add a new CSS or JavaScript code in MediaWiki, then here’s how you can do that. MediaWiki comes with two pages – MediaWiki:Common.css and MediaWiki:Common.js, where you can add your own CSS or JavaScript codes. But remember, the changes in MediaWiki:Common.css and MediaWiki:Common.js pages will affect all the skins…
By default, the mail command in Linux will make use of the local SMTP server running on port 25 for sending mails. But if you want to send mails using external SMTP server such as smtp.gmail.com or SMTP server of your organization, then you can use mailx command. Using mailx command is…