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glaukos

LinuxStories: Installing oVirt 3.5 on CentOS 7 (Hosted Engine)

By glaukos, in Διαχείριση Linux server

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glaukos    4

glaukos
Posted
I have had many people come to my blog looking how to install oVirt 3.5 software on the new CentOS 7. Much of this content is the same as my 3.4 post, but I thought I would keep it separate. Below are simple step by step instructions for installing the node and getting it configured for the hosted engine.

Installation Requirements

Please Note: Installing Hosted Engine on CentOS 7 requires oVirt 3.5.1
Please Note: Both the node and engine will be running CentOS 7 (Minimal Installation)
Please Note: Ensure the host is fully updated via “yum update” and rebooted before proceeding

Prerequisites

DNS
Ensure you have set up hostnames for the host and engine. If you do not have a DNS server configured and you are only testing oVirt on a single server, you can use /etc/hosts instead. I have the following:
Engine: Hostname: engine.xrsa.net, IP Address: 192.168.122.101/24
Host: Hostname: ovirt01.xrsa.net, IP Address: 192.168.122.100/24
 
NFS
Ensure you have set up NFS mount points for the engine and virtual machines. If you do not have a shared NFS server and you are only testing oVirt, you can configure NFS locally on the host instead.
 
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------------
-[ (Host) ]-
------------
# yum install -y nfs-utils
 
# mkdir /home/{engineha,vms} && chown 36:36 /home/{engineha,vms}
# cat > /etc/exports << EOF
/home/engineha  192.168.122.0/24(rw,anonuid=36,anongid=36,all_squash)
/home/vms       192.168.122.0/24(rw,anonuid=36,anongid=36,all_squash)
EOF
#
 
# systemctl start rpcbind.service && systemctl enable rpcbind.service
# systemctl start nfs-lock.service && systemctl enable nfs-lock.service
# systemctl start nfs-server.service && systemctl enable nfs-server.service

Verify you can see the correct mount points.


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----------
-[ Host ]-
----------
# showmount -e ovirt01.xrsa.net
Export list for ovirt01.xrsa.net:
/home/engineha 192.168.122.0/24
/home/vms      192.168.122.0/24
# mount ovirt01.xrsa.net:/home/engineha /mnt && umount /mnt
 
If you get access denied please run the below command
and rerun the mount test.
 
# systemctl restart nfs-server.service


Installation

NTP
This not a requirement, but it is recommended that you keep your servers time in sync:

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------------
-[ (Host) ]-
------------
# yum install -y ntp
# systemctl start ntpd && systemctl enable ntpd
#
 
Verify you can reach the NTP servers:
 
# ntpq -p

You may put your own NTP servers in /etc/ntp.conf if required.
Once you have verified DNS and NFS, install the required repositories and packages.

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------------
-[ (Host) ]-
------------
# yum localinstall -y https://anorien.csc.warwick.ac.uk/mirrors/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
# yum localinstall -y http://resources.ovirt.org/pub/yum-repo/ovirt-release35.rpm
# yum install -y ovirt-hosted-engine-setup bind-utils screen

We will need an ISO for the hosted engine installation.

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-----------
-[ Host ] -
-----------
# mkdir /home/tmpengineiso && cd /home/tmpengineiso
# curl -O http://mirror.ukhost4u.com/centos/7.0.1406/isos/x86_64/CentOS-7.0-1406-x86_64-Minimal.iso
# chown -R 36:36 /home/tmpengineiso

Now all the prerequisites are in place, verify DNS and then go through the hosted-engine wizard.

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-----------
-[ Host ] -
-----------
# host engine.xrsa.net; host ovirt01.xrsa.net
# screen
# hosted-engine --deploy
...
--== CONFIGURATION PREVIEW ==--
        
Bridge interface                   : eth0
Engine FQDN                        : engine.xrsa.net
Bridge name                        : ovirtmgmt
SSH daemon port                    : 22
Firewall manager                   : iptables
Gateway address                    : 192.168.122.1
Host name for web application      : ovirt01.xrsa.net
Host ID                            : 1
Image alias                        : hosted_engine
Image size GB                      : 25
Storage connection                 : nfs01.xrsa.net:/home/engineha
Console type                       : vnc
Memory size MB                     : 4096
MAC address                        : 00:16:3e:71:de:6d
Boot type                          : cdrom
Number of CPUs                     : 2
ISO image (for cdrom boot)         : /home/tmpengineiso/CentOS-7.0-1406-x86_64-Minimal.iso
CPU Type                           : model_Westmere
        
Please confirm installation settings (Yes, No)[Yes]:

The hosted-engine wizard will give you VNC details so you can connect to the hosted engine virtual machine and install CentOS 7.
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$ vncviewer -quality 2 ovirt01.xrsa.net:5900
Once installed choose option (1) on the hosted-engine wizard, it will wait until you have rebooted the hosted engine virtual machine. The wizard will give you another set of VNC details to connect to if you need it. However, if you configured networking during the install you should be able to SSH instead.
Once you have connected to the hosted engine, download the repositories, configure NTP and run through the ovirt-engine wizard. Please make sure the admin password matches up with the password set in the hosted-engine wizard.
Please note: Ensure DNS is configured properly so the engine can resolve itself and the host, else the installation will fail!
Please note: While in the engine setup wizard below ensure you put a proper ACL for the “NFS export ACL” option. If you do not you will not be able to activate the ISO_DOMAIN later.

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--------------
-[ (Engine) ]-
--------------
# yum -y update
# yum localinstall -y https://anorien.csc.warwick.ac.uk/mirrors/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
# yum localinstall -y http://resources.ovirt.org/pub/yum-repo/ovirt-release35.rpm
# yum install -y ovirt-engine bind-utils screen ntp
# host engine.xrsa.net; host ovirt01.xrsa.net
# systemctl start ntpd && systemctl enable ntpd
# ntpq -p
# screen
# engine-setup
...
--== CONFIGURATION PREVIEW ==--
        
Application mode                        : both
Firewall manager                        : firewalld
Update Firewall                         : True
Host FQDN                               : engine.xrsa.net
Engine database name                    : engine
Engine database secured connection      : False
Engine database host                    : localhost
Engine database user name               : engine
Engine database host name validation    : False
Engine database port                    : 5432
Engine installation                     : True
NFS setup                               : True
PKI organization                        : xrsa.net
NFS mount point                         : /var/lib/exports/iso
NFS export ACL                          : 192.168.122.0/24(rw)
Configure local Engine database         : True
Set application as default page         : True
Configure Apache SSL                    : True
Configure WebSocket Proxy               : True
Engine Host FQDN                        : engine.xrsa.net
        
Please confirm installation settings (OK, Cancel) [OK]:

Once finished go back to the hosted-engine wizard and finish off the installation by choosing option (1). It will ask you one final time for the hosted engine to be shutdown, wait a few minutes and it will come back up automatically.
After around a minute you can verify the state of the hosted engine virtual machine by using the following command:
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-----------
-[ Host ] -
-----------
# hosted-engine --vm-status
 
--== Host 1 status ==--
 
Status up-to-date                  : True
Hostname                           : ovirt01.xrsa.net
Host ID                            : 1
Engine status                      : {"reason": "bad vm status", "health": "bad", "vm": "up", "detail": "powering up"}
Score                              : 2400
Local maintenance                  : False
...
        host-id=1
        score=2400
        maintenance=False
        state=EngineStarting
#
 
Please wait for around five / ten minutes for the hosted engine virtual
machine to come back up properly.
 
# hosted-engine --vm-status
 
--== Host 1 status ==--
 
Status up-to-date                  : True
Hostname                           : ovirt01.xrsa.net
Host ID                            : 1
Engine status                      : {"health": "good", "vm": "up", "detail": "up"}
Score                              : 2400
Local maintenance                  : False
...
        host-id=1
        score=2400
        maintenance=False
        state=EngineUp
#


Data Domain and ISO_Domain Setup

Before you can create virtual machines in oVirt you need to create a Data Domain and ensure the ISO_DOMAIN is attached to the Default cluster.
Navigate to https://engine.xrsa.net and login with admin.
Create a new Data / NFS Domain by going to “System -> Storage -> New Domain”:

ovirt_create_datadomain

You must wait until the NFS01 Data Domain is in an active state.

ovirt_datadomain_active

Once activated attach the ISO_DOMAIN to the Default Data Center:

ISO_DOMAIN_attach

Please note: If you are having issues attaching ISO_DOMAIN to the cluster you might have forgot to add a proper ACL on the “NFS export ACL” option during the engine wizard. You can check this as follows:

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--------------
-[ (Engine) ]-
--------------
# cat /etc/exports.d/ovirt-engine-iso-domain.exports              
/var/lib/exports/iso    engine.xrsa.net(rw)
#
 
This is incorrect as the hosts are mounting this NFS share not the engine.
You can fix this by changing to the subnet the hosts are using.
 
# sed -i "s#engine.xrsa.net#192.168.122.0/24#" /etc/exports.d/ovirt-engine-iso-domain.exports
# cat /etc/exports.d/ovirt-engine-iso-domain.exports              
/var/lib/exports/iso    192.168.122.0/24(rw)
# systemctl restart nfs-server

If everything went as expected you should see both the NFS01 and ISO_DOMAIN in an up and active state:

ISO_NFS_DOMAIN_UP

 

Uploading ISO Images

There is no GUI based ISO upload tool during this time, so to upload ISO images you must login to the engine first and run the following commands:

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-[ (Engine) ]-
--------------
# curl -O http://mirror.ukhost4u.com/centos/7.0.1406/isos/x86_64/CentOS-7.0-1406-x86_64-Minimal.iso
# ovirt-iso-uploader upload -i ISO_DOMAIN CentOS-7.0-1406-x86_64-Minimal.iso
# rm CentOS-7.0-1406-x86_64-Minimal.iso


Using oVirt

At this point everything should be up and running for you to start creating virtual machines. For more information please read the oVirt Documentation: http://www.ovirt.org/Documentation


Source: https://xrsa.net/2015/02/04/installing-ovirt-3-5-on-centos-7-hosted-engine/

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