Virtualization – grepOra

Cloud Services | Exadata | Linux, Database, Oracle Engineered Systems | Exadata, Virtualization

ODA Useful Commands to Manage VMs

By matheusdba 4 de March de 2020 21 de April de 2020

1. To restart the vm:

oakcli stop vm [vm-name]
oakcli stop vm [vm-name] -force
oakcli start vm [vm-name]

2. To show All vm status

oakcli show vm

Example:

root@server oak]# oakcli show vm

NAME NODENUM MEMORY VCPU STATE REPOSITORY
vm1 1 8192 4 ONLINE fileshare

3. Listing Configured Options for a VM Template

oakcli show vmtemplate ol6linux_64

4. Adding a Network to the VM Template

oakcli modify vmtemplate ol6linux_64 -addnetwork net1

5. Configure CPU, Memory on the Template

oakcli configure vmtemplate ol6linux_64 -vcpu 4 -maxvcpu 8 -cpucap 10 -memory 3000M -maxmemory 6G -os OTHER_LINUX

6. Create a VM by Cloning from Template

oakcli clone vm ol6test -vmtemplate ol6linux_64 -repo repo1 -node oda2

7. Override VM Template Values

oakcli configure vm ol6test -vcpu 6 -memory 4G

8. Configure High Availability and Failover Values

oakcli configure vm ol6test -prefnode oda2 -failover oda1

9. Start a VM

oakcli start vm ol6test

10. Access VM Console for a VM:

oakcli show vmconsole [vm-name]

Hope it helps you!

Database, RAC | Data Guard, Virtualization

VMWare: Adding Shared Disks for Clustered Oracle Database

By matheusdba 13 de April de 2016 21 de April de 2020

Hi folks!
Today a friend asked about how to configure disks on VMWare to create a virtualized cluster database. I revisited my old notes and decided to share. Here it goes…

First, I really have some constraints about it:
– Fake “high availability”: To have HA with VM it’s not needed 2 vms, if a host fail VMWare should make a VMotion (if well configured), and no services will be affected. So, one VM is ok.
– Not real “horizontally scallated”: It probably would be better to use one server as physical than have two vms on it. Not make sense to do it…

So, why?
To prove concept, evaluate RAC configuration (caches on sequences, etc) and labs, to learn and practice RAC stuffs…

Ok, now how to make it happen?

1. Add new disk to one of the machines. Some way, one will be the “primary” and share disks with another.

2. Set Mode Thick Eager Zeroed

3. Create a specific controller to this “shared disks”

4. Set controller to virtual sharing

# Other Machine
5. Adding the existent disk to other VM (not primary, but from primary)

6. Select disk from primary

7. Create a new controller, as you made on primary and select it:

8. Set controller to virtual sharing
add10

OBS:
If this error happen, one of your controller is not in sharing mode. Please check it.
add11

And here we are! 🙂
Good lab!
Matheus.

Linux, Virtualization

VMware: Recognize Memory Addition Online

By matheusdba 6 de April de 2016 21 de April de 2020

A quick script to do that:

grep line /sys/devices/system/memory/*/state | while read bla;
do echo online /sys/devices/system/memory/memory${bla}/state; done

Have a nice day!
Matheus.

Linux, Shell Scripts, Virtualization

Is My Linux Server Physical or Virtual?

By matheusdba 21 de March de 2016 21 de April de 2020

Supposing you are in a server shell and don’t know if you machine is virtualized (a VM)?
One way to check that (supposing VMWare as hypervisioning solution) is:

[root@mydbsrvr ~]# dmidecode | grep -i vmware
Manufacturer: VMware, Inc.
Product Name: VMware Virtual Platform
Serial Number: VMware-xx xx xx xx xx xx xx xx-xx xx xx xx xx xx xx xx
Description: VMware SVGA II

If you had an answer like this, yes, it’s a VM. 🙂

Matheus.