DevSecOps - Opportunities and Challenges
It has become a standard operational practice for many of the leading software development companies to merge software development (Dev) with information technology operations (Ops). This is done mainly to
DevOps
How to fix "NoValidHost: No valid host was found. There are not enough hosts available" during overcloud deployment (openstack)
## Error: NoValidHost: No valid host was found You get below error message on the console while performing an overcloud deployment from the undercloud director ``` 2018-08-14 06:42:59Z [overcloud.Controller.0.Controller]: CREATE_FAILED
Final Part 3: Openstack TripleO Architecture and Step By Step Guide for installation of undercloud and overcloud nodes (compute, controller, ceph-storage)
**Below list of topics are covered in this article** * [Bring up undercloud director]({{< relref "openstack-tripleo-architecture-step-guide-install-undercloud-overcloud-heat-template/index.md" >}}#Bringupunderclouddirector) * [Prepare Undercloud for overcloud deployment]({{< relref "openstack-tripleo-architecture-step-guide-install-undercloud-overcloud-heat-template/index.md" >}}#PrepareUndercloudforoverclouddeployment) * [Phases of overcloud node deployment]({{< relref "openstack-tripleo-architecture-step-guide-install-undercloud-overcloud-heat-template/index.md" >}}#Phasesofovercloudnodedeployment) + [Registration]({{< relref "openstack-tripleo-architecture-step-guide-install-undercloud-overcloud-heat-template/index.md" >}}#Registration) + [Introspection]({{< relref "openstack-tripleo-architecture-step-guide-install-undercloud-overcloud-heat-template/index.md" >}}#Introspection)
Part 2: Openstack TripleO Architecture and Step By Step Guide for installation of undercloud and overcloud nodes (compute, controller, ceph-storage)
In my last article I had brought up my undercloud setup from scratch. Follow below link to get the details
Part 1: Openstack TripleO Architecture and Step By Step Guide for installation of undercloud and overcloud nodes (compute, controller, ceph-storage)
In the article we will cover below topics
How to lock or unlock a root and normal user account using pam_tally2 and pam_faillock after certain number of failed login attempts in Linux
Below list of topics will be covered in this article * [Lock account using pam_tally2]({{< relref "how-to-lock-or-unlock-root-normal-user-pamtally2-pamfaillock-linux/index.md" >}}#Lockaccountusingpamtally2) + [Lock non-root user (normal user) for failed login attempts]({{< relref "how-to-lock-or-unlock-root-normal-user-pamtally2-pamfaillock-linux/index.md" >}}#Locknonrootusernormaluserforfailedloginattempts) + [Lock "root" user for
Part 4: How to create, launch and connect to an instance from scratch in Openstack
**Below list of topics are covered in this article** * [Create an Instance]({{< relref "how-to-create-launch-and-connect-to-instance-openstack/index.md" >}}#CreateanInstance) * [Associate Floating IP to the Instance]({{< relref "how-to-create-launch-and-connect-to-instance-openstack/index.md" >}}#AssociateFloatingIPtotheInstance) * [Modify Security Group for the Instance]({{< relref "how-to-create-launch-and-connect-to-instance-openstack/index.md" >}}#ModifySecurityGroupfortheInstance) * [Connect to
Part 3: Create Glance Image, Cinder Volumes, Flavor Templates and key pairs for an Instance in Openstack
**Below list of topics are covered in this article:** * [Creating Glance Image]({{< relref "create-glance-image-flavors-key-pairs-cinder-volumes-openstack/index.md" >}}#CreatingGlanceImage) * [Create Volumes]({{< relref "create-glance-image-flavors-key-pairs-cinder-volumes-openstack/index.md" >}}#CreateVolumes) * [Create Flavors]({{< relref "create-glance-image-flavors-key-pairs-cinder-volumes-openstack/index.md" >}}#CreateFlavors) * [Managing Key Pairs]({{< relref "create-glance-image-flavors-key-pairs-cinder-volumes-openstack/index.md" >}}#ManagingKeyPairs) In my last article I have already
Part 2: Configure Openstack OVSBridge, Network (Neutron), Public and Private Network, Router in Openstack
**Below list of topics are covered in this article** * [Step 1: Configure OVSBridge on the Controller]({{< relref "configure-openstack-ovsbridge-network-neutron-router/index.md" >}}#Step1ConfigureOVSBridgeontheController) * [Step 2: Create Internal Network]({{< relref "configure-openstack-ovsbridge-network-neutron-router/index.md" >}}#Step2CreateInternalNetwork) * [Step 3: Create External Network]({{< relref "configure-openstack-ovsbridge-network-neutron-router/index.md" >}}#Step3CreateExternalNetwork) *
Part 1: Step by Step Guide to Install Openstack using Packstack with Compute and Controller node on RHEL 7
**OpenStack** project, which is also called a cloud operational system, consists of a number of different projects developing separate subsystems. Any OpenStack installation can include only a part of them. Some subsystems can even be used separately or as part of any other OpenSource project. Their number is increasing from version to version of OpenStack project, both through the appearance of new ones and the functionality split of the existing ones. For example, nova-volume service was extracted as a separate Cinder project