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Base vm server setup

Create a VM​

On the hypervisor run the following command:

sudo virt-install --connect qemu:///system \
     --network=bridge:VMnetwork \
     --initrd-inject="/home/jeremy/ks.cfg" \
     --extra-args="ks=file:/ks.cfg console=ttyS0" \
     -n $serverName \
     -f /home/imgs/$serverName.img \
     -r 1024 \
     -s 12 \
     --location=/home/isos/CentOS-7-x86_64-DVD-1908.iso \
     --os-type=centos7.0 \
     --accelerate --hvm --graphics none
note

This tutorial assumes ssh has been enabled via the kickstart file.

Configure VM​

Change hostname​

Change the hostname to something easy to remember and meaningful. For example, if the vm is hosting foreman name it foreman.internal.virtnet.

sudo hostnamectl set-hostname new-hostname.internal.virtnet

Give the vm a quick reboot to ensure changes are set:

sudo halt --reboot

Set IP address​

First, get the interface that the vm is using to communicate externally:

ip addr

Most likely this will be eth0.

Now add the following content to the interface config file (be sure to sudo!):

/etc/sysconfig/network-scripts/ifcfg-eth0
BOOTPROTO="static" #Switch to static IP
IPADDR=172.16.0.10 #Set the IP address.
NETMASK=255.255.0.0 #Subnet mask
NETWORK=172.16.0.0 #Network ID
GATEWAY=172.16.0.2 #Gateway
BROADCAST=172.16.255.255 #Broadcast
DNS1=172.16.0.8 #Internal DNS server
DNS2=8.8.8.8 #External DNS server

Once the changes are complete, restart the network:

Heads up!

If you are connected via ssh you will likely loose your connection. Be sure there is a way to access the vm without ssh (eg. using the console on the hypervisor) incase of a malformed network config file.

sudo systemctl restart network

Finally, update the VM:

sudo yum -y update

Wrapping up​

You should now have a fully updated vm with the appropriate amount of ram, storage, and cpu power. Along with ssh enabled and a hostname to boot. Specific how-tos can be viewed on the sidebar.

Troubleshooting​

Expanding memory​

Shutdown VM, edit xml, then start:

virsh
shutdown foreman
edit foreman
# old value
<memory unit='MiB'>1024</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
# new value
<memory unit='MiB'>8192</memory>
#delete <currentMemory unit='KiB'>1048576</currentMemory>
#save
start foreman

Expanding storage​

Shutdown VM and list the volumes for the vm:

virsh
shutdown foreman
domblklist foreman

use qemu-img to resize:

#set the size
sudo qemu-img resize /home/imgs/foreman.img 32G

Start the VM back up:

virsh
#check the command worked
domblkinfo foreman vda --human
start foreman