Openstack Cheat Sheet Command Page

This is a cheat sheet command page for everything related to Openstack Virtualization Server.

Create a New Image of Openstack with the format of qcow2 using available qcow2 image

openstack image create --disk-format qcow2 --file qcow_image_file protected --public new_qcow_image_file


How to Change zabbix admin password

This is an article where the main purpose is to show how to change the password of an administrator role for accessing Zabbix management page as specified in the title of this article. The steps for accomplishing that purpose is by doing sequences of command follows :

1. Basically, just access the database which is responsible for storing data related with zabbix. In the context of this article, it is MySQL Database Server since zabbix is using it as the database engine.  For accessing MySQL Database Server via command, the article in this link which has the title of ‘MySQL Database Access from Command Line in Linux’ that can be a help.

  1. Select the database which is used by zabbix.  It can be done by executing the following command :

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How to use qcow2 Image on Virtualbox

This is an article written to display or to present about how to use qcow2 image file on Virtualbox. Basically, qcow2 image as far as I know it cannot be used directly to be started or to be booted when the qcow2 image itself is basically an operating system image. To be able to use it, first of all, the qcow2 image needs to be converted. Virtualbox can start or can boot image in the vdi file format. In order for a qcow2 file image can be utilized in the Virtualbox, these steps below must be executed properly :

1. Convert the qcow2 file image. Below is how to convert the file before it can be used in Virtualbox :

qemu-img convert -f qcow2 qcow2_file_name -O vdi vdi_file_name

The command pattern above which is used to convert file image from qcow2 format into vdi format can be executed in a real situation as follows :

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Create New Instance in Openstack via Openstack Dashboard

This article is written to show step by step on how to create a new instance in Openstack virtualization technology platform. It is done, the process to create new instance via Openstack Dashboard. The process itself can be started after all the preparation on installing Openstack has already finished with the Openstack Dashboard is alive and can be accessed. The steps are shown below :

1. Login to the Openstack Dashboard. The login process can actually be read in the following article titled ‘How to Access and Login to Openstack Dashboard Page’ in this link.

2. After successfully login in the Openstack Dashboard, the display of its main page is shown below :

Create New Instance in Openstack via Openstack Dashboard
Create New Instance in Openstack via Openstack Dashboard

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How to Create a Network Port in Openstack

This is an article which is tightly related with the management of virtual server using Openstack as its virtualization technology platform or framework. In this article as shown in the title, the focus is on one of the function which can be performed through the Openstack Dashboard as the tool used to manage virtual server, it is about how to create network port in Openstack for virtual server itself.

As it has already known that every server, either it is physical or virtual, it has the same concept of having a network interface attached to it. So, in order to virtually add or giving the virtual server a virtual network interface, it must be created in the first place. This article is showing on how to create a network interface or in the term of Openstack Dashboard, it is a network port. Below are steps taken in order to create a network interface or a network port :

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Permission Denied by Server Configuration Apache Webserver for Adminer

This is an article written to inform on how to solve the error triggered which is specified in the title of this article, it is “Permission Denied by Client Configuration”. The error itself is generated in the error log file of Apache Webserver named error.log. The error file normally located in “/var/log/httpd” which is shown in the tree format as follows :

[root@hostname httpd]# tree .
├── access.log
└── error.log

0 directories, 2 files
[user@hostname httpd]#

Below is the content of the error which is available in the error.log file as shown below :

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