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Category: Cloud Computing

OpenStack Horizon Error: Unable to get network agents info

August 21, 2016September 12, 2016 No Comments

OpenStack Dashboard Error: Unable to get network agents info often seen in Horizon is a result of Neutron related problems. Usually the problem is caused by neutron-service failure due to service operation time outs. The below screenshot presents OpenStack Dashboard […]

Grzegorz Juszczak Cloud Computing

Install and Configure OpenStack Mitaka with GlusterFS on CentOS 7

August 15, 2016October 16, 2016 14 Comments

OpenStack can use diffirent backend technologies for Cinder Volumes Service to create volumes for Instances running in cloud. The default and most common backend used for Cinder Service is LVM (Logical Volume Manager), but it has one basic disadventage – […]

Grzegorz Juszczak Cloud Computing, Storage

OpenStack: Unable to Connect to Horizon Dashboard

August 10, 2016August 10, 2016 1 Comment

Pretty often after rebooting Controller node or powering it on after shutdown, the Horizon (OpenStack Dashboard) is not responding, but we know that it worked before reboot. This issue may be caused by httpd service (Apache), which entered failed state […]

Grzegorz Juszczak Cloud Computing

KVM OpenStack Error: /Stage[main]/Nova::Db::Sync/Exec[nova-db-sync]

August 7, 2016November 3, 2016 1 Comment

Few times during KVM based OpenStack (Mitaka, Newton) automated installations using packstack we encountered DB synchronization errors. It turned out, that these installation errors appeared due to slow network and/or poor hardware performance of KVM virtualized hardware used to build […]

Grzegorz Juszczak Cloud Computing

How to shrink OpenStack qcow2 image using qemu-img

May 24, 2016November 22, 2019 No Comments

If you transfer qcow2 images very frequently across OpenStack Clouds or between KVM and Openstack environments, they can quickly grow larger. Luckily qcow2 image size can be decreased to reasonable values using qemu-img tool. During image conversion the empty sectors […]

Grzegorz Juszczak Cloud Computing, Virtualization

Download Kali Linux OpenStack KVM qcow2 image by tuxfixer.com

May 20, 2016March 23, 2022

Kali Linux (formerly known as BackTrack Linux) is an open-source, Debian-based Linux distribution designed for advanced Penetration Testing and Security Auditing. Kali Linux contains dozens of tools targeted towards various information security tasks, such as Penetration Testing, Security Research, Computer […]

Grzegorz Juszczak Cloud Computing, OpenStack / KVM Images

Configure OpenStack Instance at boot using cloud-init and user data

May 3, 2016December 23, 2018 3 Comments

The administration of the large-scale production cloud environments requires the management of dozens of customer’s virtual servers (OpenStack Instances) in the cloud on the daily basis. Manual configuration of the multiple newly created Instances in the OpenStack cloud at a […]

Grzegorz Juszczak Cloud Computing, Virtualization

OpenStack: Create Instance Snapshot to backup or migrate Instance

May 2, 2016May 2, 2016 No Comments

OpenStack Snapshots can be utilized to backup Instance before some critical changes are made on Instance OS or to migrate Instance to the new OpenStack Cloud. In this tutorial we will create snapshot from existing Instance to launch it in […]

Grzegorz Juszczak Cloud Computing, Virtualization

How to Extend Subnet Allocation Pool in OpenStack

April 25, 2016June 1, 2016 No Comments

After OpenStack installation it can turn out, that the IP allocation pool of the subnet, we have just created is too small. If the allocation pool refers to public / provider network, we will quickly run out of free Floating […]

Grzegorz Juszczak Cloud Computing

OpenStack Kilo 3 Node Installation (Controller, Network, Compute) on CentOS 7

March 13, 2016August 22, 2016 54 Comments

In this tutorial we will install OpenStack Kilo release from RDO repository on three nodes (Controller, Network, Compute) based on CentOS 7 operating system using packstack automated script. The following installation utilizes VLAN based internal software network infrastructure for communication […]

Grzegorz Juszczak Cloud Computing

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