Step-by-Step Tutorial: Install OpenStack on CentOS 7 using Packstack

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Step-by-Step Tutorial: Install OpenStack on CentOS 7 using Packstack

 

In my earlier articles I shared the steps to bring up an openstack environment using tripleo deployment with an undercloud and overcloud. You should use tripleo deployment if you wish to bring up a multi node openstack environment. Although even with packstack you can bring up a multi node openstack deployment with two or more compute node but you cannot have more than one controller node when installing openstack using packstack. In this article I will share step by step tutorial to install OpenStack on CentOS 7 and RHEL 7 using Packstack.

In this article I have used KVM to create my Virtual Machines, I have written another article to install OpenStack on CentOS 7 (multinode) using Oracle VirtualBox installed on a Windows Laptop.

 

What is OpenStack?

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.

Make sure the hypervisor is enabled and supported on your blade

# grep -E ' svm | vmx' /proc/cpuinfo

You should see svm or vmx among the flags supported by the processor. Also if you execute the command:

# lsmod | grep kvm
kvm_intel 143187 3
kvm 455843 1 kvm_intel

or

# lsmod | grep kvm
kvm_amd 60314 3
kvm 461126 1 kvm_amd

you should see two kernel modules loaded in the memory. The kvm is the module independent of the vendor, and the kvm_intel or kvm_amd executes VT-x or AMD-V functionality, respectively

 

Download Links for OpenStack Distributions

Red Hat OpenStack Platform (60-day trial)
https://www.redhat.com/en/insights/openstack

RDO by Red Hat
https://www.rdoproject.org/

Mirantis OpenStack
https://www.mirantis.com/products/mirantis-openstacksoftware/

Ubuntu OpenStack
http://www.ubuntu.com/cloud/openstack

SUSE OpenStack Cloud (60-day trial)
https://www.suse.com/products/suse-openstack-cloud/

IMPORTANT NOTE:

If you are using a Virtual Environment then you can take a snapshot before you install and configure openstack so that you can revert back in case of any failures. On a physical environment you can backup your partition and later restore partition in case of any failures.

 

Install Openstack On CentOS 7 using Packstack

Packstack provides an easy way to deploy an OpenStack Platform environemnt on one or several machines because it is customizable through a answer file, which contains a set of parameters that allows custom configuration of underlying Openstack platform service.

 

What is Answer File?

Packstack provides by default an answer file template that deploys an all in one environment. When you run the packstack command non-interactively you must provide your configuration options via a text file, referred to as an answer file, instead of via standard input.

 

Step 1: Bring UP the physical host server

Firstly you need a base server on which you will create your entire Openstack cloud for which I have bought my server with RHEL 7.4

My setup detail

physical node details for openstack step by step installation

 

 

  • Next login to your server and register it with Red Hat Subscription
  • Install Virtual Machine Manager (if not already installed) using the "Application Installer"
  • Next start creating your virtual machines as described in below chapters

 

Step 2: Configure BIND DNS Server

A DNS server is recommended before you install OpenStack on CentOS 7 using Packstack.

Below are my sample configuration files

# cd /var/named/chroot/var/named

Forward zone configuration file for the controller and compute nodes

# cat example.zone
$TTL 1D
@       IN SOA  example. root (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@               IN NS   example.
                IN A    127.0.0.1
                IN A    10.43.138.12
openstack       IN A    10.43.138.12
controller      IN A    192.168.122.49
compute         IN A    192.168.122.215
compute-rhel    IN A    192.168.122.13
controller-rhel IN A    192.168.122.12

First reverse zone file for my physical host server hosting OpenStack

# cat example.rzone
$TTL 1D
@       IN SOA  example. root.example. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@       IN NS   example.
        IN A    127.0.0.1
        IN PTR  localhost.
12      IN PTR  openstack.example.

Second reverse zone file for controller and compute node

# cat openstack.rzone
$TTL 1D
@       IN SOA  example. root.example. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
@       IN NS   example.
        IN A    127.0.0.1
        IN PTR  localhost.
49      IN PTR  controller.example.
215     IN PTR  compute.example.
12      IN PTR  controller-rhel.example.
13      IN PTR  compute-rhel.example.

 

Step 3: Bring UP Compute VM

One of the basic services is OpenStack Compute (Nova). This service is installed on all cluster computer nodes. It manages the level of abstraction of virtual equipment (processors, memory, block devices, network adapters). Nova provides the management of instances of virtual machines addressing the hypervisor and giving such commands as it is launching and stopping.

 

My setup detail

compute node details

NOTE:The storage space used by an instance will be under /var/lib/glance due to which any partition used by /var must have some free storage space for an instance to be created. Below is my setup snippet
[root@compute-rhel ~]# lvs
  LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home rhel -wi-ao---- 134.49g
  root rhel -wi-ao----  50.00g
  swap rhel -wi-ao----  14.50g

[root@compute-rhel ~]# pvs
  PV         VG   Fmt  Attr PSize    PFree
  /dev/vda2  rhel lvm2 a--  <199.00g 4.00m

[root@compute-rhel ~]# vgs
  VG   #PV #LV #SN Attr   VSize    VFree
  rhel   1   3   0 wz--n- <199.00g 4.00m

[root@compute-rhel ~]# df -h
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root   50G  2.3G   48G   5% /
devtmpfs                15G     0   15G   0% /dev
tmpfs                   15G     0   15G   0% /dev/shm
tmpfs                   15G   17M   15G   1% /run
tmpfs                   15G     0   15G   0% /sys/fs/cgroup
/dev/vda1             1014M  131M  884M  13% /boot
/dev/mapper/rhel-home  135G   33M  135G   1% /home
tmpfs                  2.9G     0  2.9G   0% /run/user/0

[root@compute-rhel ~]# free -g
              total        used        free      shared  buff/cache   available
Mem:             28           0          26           0           1          27
Swap:            14           0          14

 

Pre-requisite

Before you install OpenStack on CentOS 7, disable and stop the below services using the commands as shown.

# systemctl disable NetworkManager --now

# systemctl disable firewalld --now

# systemctl restart network
# systemctl enable network

 

For RHEL 7 node: Register and subscribe to the necessary Red Hat channels as done for controller.

Before starting disable all the repos.

# subscription-manager repos --disable=*

Next enable all the required repos for to install OpenStack on RHEL 7

# subscription-manager repos --enable=rhel-7-server-rh-common-rpms
Repository 'rhel-7-server-rh-common-rpms' is enabled for this system.

# subscription-manager repos --enable=rhel-7-server-openstack-8-rpms
Repository 'rhel-7-server-openstack-8-rpms' is enabled for this system.

# subscription-manager repos --enable=rhel-7-server-extras-rpms
Repository 'rhel-7-server-extras-rpms' is enabled for this system.

# subscription-manager repos --enable=rhel-7-server-rpms
Repository 'rhel-7-server-rpms' is enabled for this system.

 

Enable below repository to install OpenStack on CentOS 7 using Packstack

# yum install -y https://rdoproject.org/repos/rdo-release.rpm

Next install the openstack repository by installing the below rpm

# yum install -y centos-release-openstack-stein

Make sure the repository is enabled:

# yum-config-manager --enable openstack-stein

 

Step 4: Bring UP Controller VM

The Controller node is where most of the shared OpenStack services and other tools run. It supplies API, scheduling, and other shared services for the cloud.

I have already shared the configuration for my Virtual Machine. Since controller node will only host important openstack services hence we do not need too assign too much resource to this node.

My setup details

controller node details

NOTE:
I will also create an additional volume group "cinder-volumes" to be used by the CINDER service. So make sure when you are creating the controller node, create one additional volume-group "cinder-volumes" with enough space, for me I have given 100GB which will be used for adding additional volume when launching Instance.

Below is my setup snippet

[root@controller-rhel ~]# pvs
  PV         VG             Fmt  Attr PSize    PFree
  /dev/vda3  rhel           lvm2 a--   <38.52g   <7.69g
  /dev/vdb1  cinder-volumes lvm2 a--  <100.00g <100.00g

[root@controller-rhel ~]# vgs
  VG             #PV #LV #SN Attr   VSize    VFree
  cinder-volumes   1   0   0 wz--n- <100.00g <100.00g
  rhel             1   2   0 wz--n-  <38.52g   <7.69g

[root@controller-rhel ~]# lvs
  LV     VG   Attr       LSize  Pool   Origin Data%  Meta%  Move Log Cpy%Sync Convert
  pool00 rhel twi-aotz-- 30.79g               15.04  11.48
  root   rhel Vwi-aotz-- 30.79g pool00        15.04

[root@controller-rhel ~]# free -g
              total        used        free      shared  buff/cache   available
Mem:              9           2           4           0           3           7
Swap:             0           0           0

 

Pre-requisite

The list of pre-requisites are same as done for Compute Node above.

 

Install Packstack

Now to Install OpenStack on CentOS 7 we need PackStack utility which you can install using yum

# yum install -y openstack-packstack

Next generate your answer file /root/answers.txt and view the resulting file

# packstack --gen-answer-file ~/answer-file.txt

Now we are ready to create and modify our answers file to deploy openstack services on our controller and compute node

 

Step 5: Create answers file and Install Openstack

Below are the changes which I have done for my setup to install OpenStack on CentOS 7.

custom answer file for packstack

Next execute the packstack utility on the controller node to install OpenStack on CentOS 7 using the syntax as shown below

[root@controller-rhel ~]# packstack --answer-file /root/answers.txt
Welcome to the Packstack setup utility

The installation log file is available at: /var/tmp/packstack/20180707-225026-DOdBB6/openstack-setup.log

Installing:
Clean Up                                             [ DONE ]
Discovering ip protocol version                      [ DONE ]
Setting up ssh keys                                  [ DONE ]
Preparing servers                                    [ DONE ]
Pre installing Puppet and discovering hosts' details [ DONE ]
Adding pre install manifest entries                  [ DONE ]
Installing time synchronization via NTP              [ DONE ]
Setting up CACERT                                    [ DONE ]
Adding AMQP manifest entries                         [ DONE ]
Adding MariaDB manifest entries                     [ DONE ]
Adding Apache manifest entries                       [ DONE ]
Fixing Keystone LDAP config parameters to be undef if empty[ DONE ]
Adding Keystone manifest entries                     [ DONE ]
Adding Glance Keystone manifest entries              [ DONE ]
Adding Glance manifest entries                       [ DONE ]
Adding Cinder Keystone manifest entries              [ DONE ]
Checking if the Cinder server has a cinder-volumes vg[ DONE ]
Adding Cinder manifest entries                       [ DONE ]
Adding Nova API manifest entries                     [ DONE ]
Adding Nova Keystone manifest entries                [ DONE ]
Adding Nova Cert manifest entries                    [ DONE ]
Adding Nova Conductor manifest entries               [ DONE ]
Creating ssh keys for Nova migration                 [ DONE ]
Gathering ssh host keys for Nova migration           [ DONE ]
Adding Nova Compute manifest entries                 [ DONE ]
Adding Nova Scheduler manifest entries               [ DONE ]
Adding Nova VNC Proxy manifest entries               [ DONE ]
Adding OpenStack Network-related Nova manifest entries[ DONE ]
Adding Nova Common manifest entries                  [ DONE ]
Adding Neutron VPNaaS Agent manifest entries         [ DONE ]
Adding Neutron FWaaS Agent manifest entries          [ DONE ]
Adding Neutron LBaaS Agent manifest entries          [ DONE ]
Adding Neutron API manifest entries                  [ DONE ]
Adding Neutron Keystone manifest entries             [ DONE ]
Adding Neutron L3 manifest entries                   [ DONE ]
Adding Neutron L2 Agent manifest entries             [ DONE ]
Adding Neutron DHCP Agent manifest entries           [ DONE ]
Adding Neutron Metering Agent manifest entries       [ DONE ]
Adding Neutron Metadata Agent manifest entries       [ DONE ]
Adding Neutron SR-IOV Switch Agent manifest entries  [ DONE ]
Checking if NetworkManager is enabled and running    [ DONE ]
Adding OpenStack Client manifest entries             [ DONE ]
Adding Horizon manifest entries                      [ DONE ]
Adding post install manifest entries                 [ DONE ]
Copying Puppet modules and manifests                 [ DONE ]
Applying 192.168.122.13_prescript.pp
Applying 192.168.122.12_prescript.pp
192.168.122.13_prescript.pp:                         [ DONE ]
192.168.122.12_prescript.pp:                         [ DONE ]
Applying 192.168.122.13_chrony.pp
Applying 192.168.122.12_chrony.pp
192.168.122.13_chrony.pp:                            [ DONE ]
192.168.122.12_chrony.pp:                            [ DONE ]
Applying 192.168.122.12_amqp.pp
Applying 192.168.122.12_mariadb.pp
192.168.122.12_amqp.pp:                              [ DONE ]
192.168.122.12_mariadb.pp:                           [ DONE ]
Applying 192.168.122.12_apache.pp
192.168.122.12_apache.pp:                            [ DONE ]
Applying 192.168.122.12_keystone.pp
Applying 192.168.122.12_glance.pp
Applying 192.168.122.12_cinder.pp
192.168.122.12_keystone.pp:                          [ DONE ]
192.168.122.12_cinder.pp:                            [ DONE ]
192.168.122.12_glance.pp:                            [ DONE ]
Applying 192.168.122.12_api_nova.pp
192.168.122.12_api_nova.pp:                          [ DONE ]
Applying 192.168.122.12_nova.pp
Applying 192.168.122.13_nova.pp
192.168.122.12_nova.pp:                              [ DONE ]
192.168.122.13_nova.pp:                              [ DONE ]
Applying 192.168.122.13_neutron.pp
Applying 192.168.122.12_neutron.pp
192.168.122.12_neutron.pp:                           [ DONE ]
192.168.122.13_neutron.pp:                           [ DONE ]
Applying 192.168.122.12_osclient.pp
Applying 192.168.122.12_horizon.pp
192.168.122.12_osclient.pp:                          [ DONE ]
192.168.122.12_horizon.pp:                           [ DONE ]
Applying 192.168.122.13_postscript.pp
Applying 192.168.122.12_postscript.pp
192.168.122.12_postscript.pp:                        [ DONE ]
192.168.122.13_postscript.pp:                        [ DONE ]
Applying Puppet manifests                            [ DONE ]
Finalizing                                           [ DONE ]
 **** Installation completed successfully ******
Additional information:
 * File /root/keystonerc_admin has been created on OpenStack client host 192.168.122.12. To use the command line tools you need to source the file.
 * To access the OpenStack Dashboard browse to http://192.168.122.12/dashboard .
Please, find your login credentials stored in the keystonerc_admin in your home directory.
 * The installation log file is available at: /var/tmp/packstack/20180707-225026-DOdBB6/openstack-setup.log
 * The generated manifests are available at: /var/tmp/packstack/20180707-225026-DOdBB6/manifests

If everything goes nice then you should see all GREEN and at the end of you will get the link to your dashboard (as highlighted). So this means our openstack installation on RHEL/CentOS 7 is complete.

NOTE:

However you can rerun PackStack with option -d if you need to update the configuration.

 

Step 6: Check OpenStack service status

Install openstack-utils to check the status of all the openstack services

# yum -y install openstack-utils

Next check the status

[root@controller-rhel ~]# openstack-status
== Nova services ==
openstack-nova-api:                     active
openstack-nova-cert:                    active
openstack-nova-compute:                 inactive  (disabled on boot)
openstack-nova-network:                 inactive  (disabled on boot)
openstack-nova-scheduler:               active
openstack-nova-conductor:               active
== Glance services ==
openstack-glance-api:                   active
openstack-glance-registry:              active
== Keystone service ==
openstack-keystone:                     inactive  (disabled on boot)
== Horizon service ==
openstack-dashboard:                    active
== neutron services ==
neutron-server:                         active
neutron-dhcp-agent:                     active
neutron-l3-agent:                       active
neutron-metadata-agent:                 active
neutron-openvswitch-agent:              active
== Cinder services ==
openstack-cinder-api:                   active
openstack-cinder-scheduler:             active
openstack-cinder-volume:                active
openstack-cinder-backup:                inactive  (disabled on boot)
== Support services ==
mysqld:                                 unknown
libvirtd:                               active
openvswitch:                            active
dbus:                                   active
target:                                 active
rabbitmq-server:                        active
memcached:                              active
== Keystone users ==
Warning keystonerc not sourced

ALSO READ:
Check Openstack version and mapped release information

 

Step 7: Source keystonerc file

Now once you install OpenStack on CentOS 7, next you can source your keystoncerc file to get more detailed list of openstack-service status. This keystonerc file will be available at the home folder of the root user as shown below:

[root@controller-rhel ~]# ls -l keystonerc_admin
-rw-------. 1 root root 229 Jul  7 22:57 keystonerc_admin
[root@controller-rhel ~]# pwd
/root

[root@controller-rhel ~]# source keystonerc_admin

Next check the status of openstack services

[root@controller-rhel ~(keystone_admin)]# openstack-status
== Nova services ==
openstack-nova-api:                     active
openstack-nova-cert:                    active
openstack-nova-compute:                 inactive  (disabled on boot)
openstack-nova-network:                 inactive  (disabled on boot)
openstack-nova-scheduler:               active
openstack-nova-conductor:               active
== Glance services ==
openstack-glance-api:                   active
openstack-glance-registry:              active
== Keystone service ==
openstack-keystone:                     inactive  (disabled on boot)
== Horizon service ==
openstack-dashboard:                    active
== neutron services ==
neutron-server:                         active
neutron-dhcp-agent:                     active
neutron-l3-agent:                       active
neutron-metadata-agent:                 active
neutron-openvswitch-agent:              active
== Cinder services ==
openstack-cinder-api:                   active
openstack-cinder-scheduler:             active
openstack-cinder-volume:                active
openstack-cinder-backup:                inactive  (disabled on boot)
== Support services ==
mysqld:                                 unknown
libvirtd:                               active
openvswitch:                            active
dbus:                                   active
target:                                 active
rabbitmq-server:                        active
memcached:                              active
== Keystone users ==
+----------------------------------+---------+---------+-------------------+
|                id                |   name  | enabled |       email       |
+----------------------------------+---------+---------+-------------------+
| e97f18a9994e4b99bcc0e6fe8db95cd3 |  admin  |   True  |   root@localhost  |
| dccbaca5e2ee4866b343573678ec3bf7 |  cinder |   True  |  cinder@localhost |
| 7dec80c93f8a4aafa1559a59e6bf606c |  glance |   True  |  glance@localhost |
| 778e4fbefdfa4329bf9b7143ce6ffe74 | neutron |   True  | neutron@localhost |
| e3d85ca8a8bb4ba5a9457712ce5814f5 |   nova  |   True  |   nova@localhost  |
+----------------------------------+---------+---------+-------------------+
== Glance images ==
+----+------+
| ID | Name |
+----+------+
+----+------+
== Nova managed services ==
+----+------------------+------------------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host                   | Zone     | Status  | State | Updated_at                 | Disabled Reason |
+----+------------------+------------------------+----------+---------+-------+----------------------------+-----------------+
| 1  | nova-consoleauth | controller-rhel.example| internal | enabled | up    | 2018-07-07T18:02:59.000000 | -               |
| 2  | nova-scheduler   | controller-rhel.example| internal | enabled | up    | 2018-07-07T18:03:00.000000 | -               |
| 3  | nova-conductor   | controller-rhel.example| internal | enabled | up    | 2018-07-07T18:03:01.000000 | -               |
| 4  | nova-cert        | controller-rhel.example| internal | enabled | up    | 2018-07-07T18:02:57.000000 | -               |
| 5  | nova-compute     | compute-rhel.example   | nova     | enabled | up    | 2018-07-07T18:03:04.000000 | -               |
+----+------------------+------------------------+----------+---------+-------+----------------------------+-----------------+
== Nova networks ==
+----+-------+------+
| ID | Label | Cidr |
+----+-------+------+
+----+-------+------+
== Nova instance flavors ==
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| ID | Name      | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| 1  | m1.tiny   | 512       | 1    | 0         |      | 1     | 1.0         | True      |
| 2  | m1.small  | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
| 3  | m1.medium | 4096      | 40   | 0         |      | 2     | 1.0         | True      |
| 4  | m1.large  | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
| 5  | m1.xlarge | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
== Nova instances ==
+----+------+--------+------------+-------------+----------+
| ID | Name | Status | Task State | Power State | Networks |
+----+------+--------+------------+-------------+----------+
+----+------+--------+------------+-------------+----------+

So as you see it gives me a detailed status of all the openstack services.

 

Step 8: Access OpenStack Horizon Dashboard

So now our OpenStack installation is complete using packstack on CentOS/RHEL 7 and we can see our services are also up and running properly. Finally now you can login to the horizon dashboard.

openstack horizon dashboard

 

Lastly I hope the steps from the article to install OpenStack on CentOS 7 Linux was helpful. So, let me know your suggestions and feedback using the comment section.

 

8 thoughts on “Step-by-Step Tutorial: Install OpenStack on CentOS 7 using Packstack”

  1. Not able to install packstack on REDHAT 8..

    Getting error..

    [root@ip-172-31-17-140 yum.repos.d]# yum install -y openstack-packstack
    Last metadata expiration check: 0:26:52 ago on Mon 05 Aug 2019 11:00:57 AM UTC.
    Error:
    Problem: conflicting requests
    - nothing provides python-netifaces needed by openstack-packstack-1:14.0.0-0.1.0rc1.el7.noarch
    - nothing provides PyYAML needed by openstack-packstack-1:14.0.0-0.1.0rc1.el7.noarch
    - nothing provides python-docutils needed by openstack-packstack-1:14.0.0-0.1.0rc1.el7.noarch
    (try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
    [root@ip-172-31-17-140 yum.repos.d]#

    Reply
    • Thank you for highlighting this. RHEL is just released and still has many open points and i doubt if their satellite server contains these dependencies. But nevertheless I will try to check if I can get a solution for you. In the meanwhile if you manage to find a working solution then please do share here.

      Reply
  2. I'm installing Packstack on single physical server, but before installation finishes in getting Too Many connections error and installation fails.
    Please help

    Reply
  3. [root@jwu ~]# sudo yum install -y openstack-packstack
    Last metadata expiration check: 0:03:45 ago on Wed 15 Apr 2020 08:25:59 PM UTC.
    Error:
    Problem: conflicting requests
    - nothing provides python-netifaces needed by openstack-packstack-1:15.0.0-0.1.0rc1.el7.noarch
    - nothing provides PyYAML needed by openstack-packstack-1:15.0.0-0.1.0rc1.el7.noarch
    - nothing provides python-docutils needed by openstack-packstack-1:15.0.0-0.1.0rc1.el7.noarch
    (try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
    [root@jwu ~]#

    Reply
  4. Hi ,
    I have already packstack running environment, but my many service has been corrupted and getting many issue.
    Can I redeploy with same shared step ?
    Or reinstall of packstack need any deletion or cleanup? Or simple I can run
    packstack --answer-file /root/answer.txt

    Reply
    • You can just go ahead and redeploy with packstack –answer-file /root/answer.txt. It will perform cleanup, but if your services are getting corrupted I would suggest to also check the system resources once.
      If you just wish to update the configuration then you can use -d with packstack

      Reply

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