I came across some good info about the difference between two major Iaas provider Openstack and VMware. So thought of sharing with this blog. Couple of differences are as follows.
Basic Cinder (volume) service functionality in Openstack – Part2
We saw volume creation with related issues and probable solutions.
Now we will see volume attach to VM. Create partition on it. Remove it and detach volume from VM.
Attach created volume to testvm. Following is command-line requirement for cinder volume-attach.
Volume ID will get it from cinder-list use auto to autoassign the new device.
You can check volume status is changed to in-use now and also changed attached with VM ID.
Continue reading “Basic Cinder (volume) service functionality in Openstack – Part2”
Basic Cinder (volume) service functionality in Openstack – Part1
In this post I am going to show you basic functionality of openstack cinder (volume) service functionality by creating volume on internal storage. Attaching that volume to VM. Create partition on that volume in client machine and test partition remove and detaching volume from VM.
Lets take one running state vm for cinder testing as we can do this operation on the fly. I have one VM name testvm.
Check the disk and partitions on the VM. I can access the testvm using private IP and public IP. Lets access it using private IP using unique network namespace.
First check private-net network ID and test the ping to private IP of VM using network namespace. For more details about basic networking in openstack check my last blog posts.
Continue reading “Basic Cinder (volume) service functionality in Openstack – Part1”
Failed to start OpenStack Identity Service (code-named Keystone).
When you installed Openstack using packstack you might have faced openstack-keystone service issue. When try it to restart it fails with code-name keystone error.
I have done some research on it and found the solution.
The issue is with Openstack Keystone Service which we have configured using httpd deamon in answers.cfg file ( configuration file used to install Openstack using packstack)
Now openstack-keystone service will not start as http service is already in started mode and we haven’t created any relation between openstack-keystone and http service.
So to start openstack-keystone service we have to create symbolic link and point openstack-keystone service to http service.
Continue reading “Failed to start OpenStack Identity Service (code-named Keystone).”
Basic networking in Openstack Part2
In first part we saw how to create new VM in internal/private network now in this post we will see how to add external/public network to VM instance.
First check if our existing VM is in running state.
Now also check available network using CLI and using Openstack Dashboard.
Basic networking in Openstack Part 1
Once you install Openstack in single node or multinode setup next thing is to setup network. To understand networking in Openstack is little tedious job. This post is to describe basic Openstack networking concept by creating internal/external networking and testing the same.
First delete all default network like public and private which were created by default after Openstack installation using
#neutron net-delete <net-name>
Let us create new internal network first.
Create subnet for network private-net with subnet address 10.0.0.0/24
Graphical/Desktop UI for Centos 7/RHEL 7
Many times we need graphical UI to open/run some applications. So following are simple and quick steps to create graphical UI on Centos7/RHEL7.
First check you have yum repository configured to access local or internet repository
#yum repolist
Graphical UI filesets will install in group so that all required/dependent filesets will install automatically. Check all available groups in yum repository using group list
Multinode Openstack Installation on Centos 7/RHEL 7
This post describing multinode OpenStack installation on centos7/rhel7 for Liberty release. If you want to do single node installation please refer my earlier post.
We are installing OpenStack onto 3 nodes controller,compute and network using packstack utility
Following is 3 node Openstack Architecture and related Openstack services running on respective nodes. I am using two network one is management network of 192.168.56.* which is used for internal communication between nodes and one external network used to assign public IP to VM and to access instances/VM from outside. I am also using NATed DHCP ip on each nodes to download required filesets from internet.
Continue reading “Multinode Openstack Installation on Centos 7/RHEL 7”
Slow SSH login issue on Linux
Many times I have encountered this issue that user is waiting for long duration to get password prompt. I used to type fast and working on couple of windows so hate to wait for longer duration just to insert my password.
I have searched about this issue and found out the cause so sharing that with you all to avoid waiting window. Solution is very simple.
Whenever user is login using SSH its going through reverse DNS lookup and searching host details from machine IP address before login to machine. This is helpful for security purpose but our default configuration and SELINUX security does that job anyway.
This is default setting present in sshd_config for reverse DNS lookup.
Modify it by removing # and changing ‘yes’ to ‘no’
Openstack Liberty install using packstack on Centos 7/RHEL 7
This post is a quickstart guide to install OpenStack Liberty release using packstack on CentOS7.
This is very basic POC setup where all components will be installed on one node only. I will create another post for multinode installation setup.
- Install CentOS using minimal install Software Selection.
Continue reading “Openstack Liberty install using packstack on Centos 7/RHEL 7”
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