Hey Everyone,
I am currently attempting to generate a virtual machine image with packer
to help automate our node creation process.
Every node we've made thus far with virtual machine manager has been copied
off a base node and connects to the network via macvtap.
These macvtaps appear to be automatically generated after you select the
configuration in the virtual machine manager then boot up the VM.
They can also manually be configured
<https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm>
via the XML that is passed to Virt-manager
Auto-generated XML example of macvtap(redacted mac):
<interface type='direct'>
<mac address='XX:XX:XX:YY:YY:YY'/>
<source dev='enp1s0f0' mode='bridge'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function=
'0x0'/>
</interface>
The trouble I'm having is figuring out how it goes about generating these
macvtaps and successfully connecting to the intranet by passing the device
info via qemuargs.
I've tried a couple of options; namely here
<https://gist.github.com/mcastelino/43cc733e53d65ef67452ecaf78e936c2> and
here <https://virt.kernelnewbies.org/MacVTap> and usually receive an error
like: "TUNSETOFFLOAD ioctl() failed: Inappropriate ioctl for device"
The use of a bridge or user generated network is unavailable to me and
results in ssh timeouts whether it cant establish a handshake or it
timeouts on the loopback lookup.
Packer json (redacted mac):
"builders":
[
{
"type": "qemu",
"name": "packer-base",
"qemu_binary": "/usr/libexec/qemu-kvm",
"vm_name": "packer-base",
"iso_url": "/root/Downloads/CentOS-7-x86_64-Minimal-1708.iso",
"iso_checksum": "aae20c8052a55cf179af88d9dd35f1a889cd5773",
"iso_checksum_type": "sha1",
"output_directory": "./centos-built",
"shutdown_command": "shutdown -P now",
"disk_size": 5000,
"format": "qcow2",
"headless" : false,
"accelerator": "kvm",
"http_directory": "httpdir",
"http_port_min": 10082,
"http_port_max": 10089,
"ssh_host_port_min": 2222,
"ssh_host_port_max": 2229,
"ssh_username": "root",
"ssh_password": "somepass",
"ssh_port": 22,
"ssh_timeout": "30s",
"ssh_wait_timeout": "2m",
"net_device": "virtio-net",
"disk_interface": "virtio",
"qemuargs": [
[ "-netdev", "tap,fd=3,id=hostnet0,vhost=on,vhostfd=4" ],
[ "-device",
"virtio-net-pci,netdev=hostnet0,id=net0,mac=XX:XX:XX:YY:YY:YY" ]
],
"boot_wait": "7s",
"boot_command": [
"<tab> text ks=http://{{ .HTTPIP }}:{{ .HTTPPort
}}/centos7_2-ks.cfg<enter><wait>"
]
}
]
}
ks file
#platform=x86, AMD64, or Intel EM64T
#version=DEVEL
# Install OS instead of upgrade
skipx
install
# Keyboard layouts
# old format: keyboard us
# new format:
keyboard --vckeymap=us --xlayouts='us'
# Root password
rootpw --iscrypted somepassbutencrypted
# System language
lang en_US.UTF-8
# Firewall configuration
firewall --disabled
# System authorization information
auth --useshadow --passalgo=sha512
# Use text mode install
# Run the Setup Agent on first boot
firstboot --enable
# Use http
url --url http://mirror.raystedman.net/centos/7/os/x86_64/
repo --name=updates --baseurl=http:
//mirror.raystedman.net/centos/7/updates/x86_64/
# SELinux configuration
selinux --disabled
# System services
services --disabled="chronyd"
services --enabled=NetworkManager,sshd
user --name=hsimage --plaintext --password hsimage
ignoredisk --only-use=vda
# Network information
network --bootproto=static --device=eth0 --gateway=172.31.0.1 --ip=172.31.
1.152 --netmask=255.255.0.0 --nameserver=10.2.1.205,10.2.1.225 --onboot=yes
--activate
# System timezone
timezone America/Los_Angeles --nontp
# System bootloader configuration
bootloader --append=" crashkernel=auto" --location=none --boot-drive=vda
autopart --type=lvm
# Partition clearing information
clearpart --all --initlabel
# restart after installation
reboot
%packages
@^minimal
@core
kexec-tools
git
%end
%post
sed -i "s/#PermitRootLogin yes/PermitRootLogin yes/g" /etc/ssh/sshd_config
%end
Qemu commandline documentation
<http://qemu.weilnetz.de/doc/qemu-doc.html#Network-options>
example configuration from existing VM retrieved via 'ps' command(redacted
mac):
ps -ef | grep qemu-kvm
-netdev tap,fd=29,id=hostnet0,vhost=on,vhostfd=32
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=XX:XX:XX:YY:YY:YY,bus=pci
.0,addr=0x3
There is just something I'm not quite getting with preliminary vm network
configuration that is preventing me from making a tap connection work.
Let me know if there is any additional info that is needed and thanks in
advance for any help!
Regards,
Tanner
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