centos 8 cloud image + not changing cloud config hostname

encryptblockr

coud-init setup for centos 8

what is the equivalent of this command or step for creating centos 8 cloud image for use with XOA as seen in this tutorial https://xen-orchestra.com/blog/debian-cloud-template-for-xenserver/?

dpkg-reconfigure cloud-init

I have done everything else but that step is what remains

Here are logs from /var/log/cloud-init.log

2019-12-22 00:55:05,752 - util.py[DEBUG]: Restoring selinux mode for /var/log/cloud-init.log (recursive=False)
2019-12-22 00:55:05,754 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/instance/boot-finished
2019-12-22 00:55:05,755 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/data/no-net
2019-12-22 00:55:05,755 - handlers.py[DEBUG]: start: init-local/check-cache: attempting to read from cache [check]
2019-12-22 00:55:05,756 - util.py[DEBUG]: Reading from /var/lib/cloud/instance/obj.pkl (quiet=False)
2019-12-22 00:55:05,756 - stages.py[DEBUG]: no cache found
2019-12-22 00:55:05,757 - handlers.py[DEBUG]: finish: init-local/check-cache: SUCCESS: no cache found
2019-12-22 00:55:05,757 - util.py[DEBUG]: Attempting to remove /var/lib/cloud/instance
2019-12-22 00:55:05,776 - stages.py[DEBUG]: Using distro class <class 'cloudinit.distros.rhel.Distro'>
2019-12-22 00:55:05,777 - __init__.py[DEBUG]: Looking for data source in: ['NoCloud', 'ConfigDrive', 'OpenNebula', 'DigitalOcean', 'Azure', 'AltCloud', 'OVF', 'MAAS', 'GCE', 'OpenStack', 'AliYun', 'Ec2', 'CloudSigma', 'CloudStack', 'SmartOS', 'Bigstep', 'Scaleway', 'Hetzner', 'IBMCloud', 'Oracle', 'None'], via packages ['', 'cloudinit.sources'] that matches dependencies ['FILESYSTEM']
2019-12-22 00:55:05,926 - util.py[DEBUG]: Reading from /etc/os-release (quiet=False)
2019-12-22 00:55:05,926 - util.py[DEBUG]: Read 420 bytes from /etc/os-release
2019-12-22 00:55:06,072 - __init__.py[DEBUG]: Searching for local data source in: ['DataSourceNoCloud', 'DataSourceConfigDrive', 'DataSourceOpenNebula', 'DataSourceDigitalOcean', 'DataSourceAzure', 'DataSourceOVF', 'DataSourceOpenStackLocal', 'DataSourceEc2Local', 'DataSourceCloudSigma', 'DataSourceSmartOS', 'DataSourceScaleway', 'DataSourceHetzner', 'DataSourceIBMCloud', 'DataSourceOracle']
2019-12-22 00:55:06,073 - handlers.py[DEBUG]: start: init-local/search-NoCloud: searching for local data from DataSourceNoCloud
2019-12-22 00:55:06,073 - __init__.py[DEBUG]: Seeing if we can get any data from <class 'cloudinit.sources.DataSourceNoCloud.DataSourceNoCloud'>
2019-12-22 00:55:06,074 - __init__.py[DEBUG]: Update datasource metadata and network config due to events: New instance first boot
2019-12-22 00:55:06,074 - util.py[DEBUG]: Running command ['systemd-detect-virt', '--quiet', '--container'] with allow...skipping...
requency once-per-instance
2019-12-22 01:25:43,247 - util.py[DEBUG]: Writing to /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_phone_home - wb: [644] 25 bytes
2019-12-22 01:25:43,248 - util.py[DEBUG]: Restoring selinux mode for /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_phone_home (recursive=False)
2019-12-22 01:25:43,252 - util.py[DEBUG]: Restoring selinux mode for /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_phone_home (recursive=False)
2019-12-22 01:25:43,253 - helpers.py[DEBUG]: Running config-phone-home using lock (<FileLock using file '/var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_phone_home'>)
2019-12-22 01:25:43,253 - cc_phone_home.py[DEBUG]: Skipping module named phone-home, no 'phone_home' configuration found
2019-12-22 01:25:43,253 - handlers.py[DEBUG]: finish: modules-final/config-phone-home: SUCCESS: config-phone-home ran successfully
2019-12-22 01:25:43,253 - stages.py[DEBUG]: Running module final-message (<module 'cloudinit.config.cc_final_message' from '/usr/lib/python3.6/site-packages/cloudinit/config/cc_final_message.py'>) with frequency always
2019-12-22 01:25:43,253 - handlers.py[DEBUG]: start: modules-final/config-final-message: running config-final-message with frequency always
2019-12-22 01:25:43,254 - helpers.py[DEBUG]: Running config-final-message using lock (<cloudinit.helpers.DummyLock object at 0x7f47cf9a3dd8>)
2019-12-22 01:25:43,254 - util.py[DEBUG]: Reading from /proc/uptime (quiet=False)
2019-12-22 01:25:43,254 - util.py[DEBUG]: Read 12 bytes from /proc/uptime
2019-12-22 01:25:43,267 - util.py[DEBUG]: Cloud-init v. 18.5 finished at Sun, 22 Dec 2019 01:25:43 +0000. Datasource DataSourceConfigDrive [net,ver=2][source=/dev/xvdc].  Up 38.53 seconds
2019-12-22 01:25:43,267 - util.py[DEBUG]: Writing to /var/lib/cloud/instance/boot-finished - wb: [644] 50 bytes
2019-12-22 01:25:43,268 - util.py[DEBUG]: Restoring selinux mode for /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/boot-finished (recursive=False)
2019-12-22 01:25:43,269 - util.py[DEBUG]: Restoring selinux mode for /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/boot-finished (recursive=False)
2019-12-22 01:25:43,270 - handlers.py[DEBUG]: finish: modules-final/config-final-message: SUCCESS: config-final-message ran successfully
2019-12-22 01:25:43,270 - stages.py[DEBUG]: Running module power-state-change (<module 'cloudinit.config.cc_power_state_change' from '/usr/lib/python3.6/site-packages/cloudinit/config/cc_power_state_change.py'>) with frequency once-per-instance
2019-12-22 01:25:43,270 - handlers.py[DEBUG]: start: modules-final/config-power-state-change: running config-power-state-change with frequency once-per-instance
2019-12-22 01:25:43,271 - util.py[DEBUG]: Writing to /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_power_state_change - wb: [644] 25 bytes
2019-12-22 01:25:43,272 - util.py[DEBUG]: Restoring selinux mode for /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_power_state_change (recursive=False)
2019-12-22 01:25:43,273 - util.py[DEBUG]: Restoring selinux mode for /var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_power_state_change (recursive=False)
2019-12-22 01:25:43,273 - helpers.py[DEBUG]: Running config-power-state-change using lock (<FileLock using file '/var/lib/cloud/instances/644f20b5-5b83-dd11-97e5-10f849181b0e/sem/config_power_state_change'>)
2019-12-22 01:25:43,274 - cc_power_state_change.py[DEBUG]: no power_state provided. doing nothing
2019-12-22 01:25:43,274 - handlers.py[DEBUG]: finish: modules-final/config-power-state-change: SUCCESS: config-power-state-change ran successfully
2019-12-22 01:25:43,274 - main.py[DEBUG]: Ran 10 modules with 0 failures
2019-12-22 01:25:43,275 - util.py[DEBUG]: Creating symbolic link from '/run/cloud-init/result.json' => '../../var/lib/cloud/data/result.json'
2019-12-22 01:25:43,276 - util.py[DEBUG]: Reading from /proc/uptime (quiet=False)
2019-12-22 01:25:43,278 - util.py[DEBUG]: Read 12 bytes from /proc/uptime
2019-12-22 01:25:43,278 - util.py[DEBUG]: cloud-init mode 'modules' took 0.408 seconds (0.41)
2019-12-22 01:25:43,278 - handlers.py[DEBUG]: finish: modules-final: SUCCESS: running modules for final

changing hostname via cloud config not working

cloudinit is not changing the hostname i passed in the cloud config file when it creates new VM from a cloud image. Is there a place to check to make sure i have correct settings?

here is what i have in my

...
...
preserve_hostname: false
...
...
cloud_init_modules:
 - disk_setup
 - migrator
 - bootcmd
 - write-files
 - growpart
 - resizefs
 - set_hostname
 - update_hostname
 - update_etc_hosts
 - rsyslog
 - users-groups
 - ssh
...
...

but yet it is not modifying the hostname on centos 8 cloud image i created

encryptblockr

is this step really needed for the Debian/Ubuntu cloud images?
$ dpkg-reconfigure cloud-init

if yes, then what is the use of that? and why is it needed?
and why was this not needed for centos 8 cloud image? didn't have to run this command and the centos 8 cloud image works fine

Also if yes, then is this correct selection?

olivierlambert

dpkg is a Debian/Ubuntu package management thing. CentOS doesn't use dpkg but rpm.
This was needed on old Debian/Ubuntu to tell to use the "right" config drive option. You can setup this in the Cloudinit config file directly. Take time to read carefully CloudInit configuration, it's not great but still a good start https://cloudinit.readthedocs.io/en/latest/

@fohdeesha might be able to give you some hints too

encryptblockr

@olivierlambert

yeah so far i got everything to work on centos 8 cloud image
only thing not working is the hostname changing..the hostname is not working
creating new VMs with a different hostname does not work and keeps hostname of the template

fohdeesha

paste exactly what you're entering into the two cloud-init config boxes in XO

encryptblockr

@fohdeesha

here is what is in my XOA cloud config file

#cloud-config
hostname: host
ssh_authorized_keys:
  - ssh-rsa user1@host1
  - ssh-rsa user2@host2
  - ssh-rsa user3@host3

redacted the ssh keys ofcourse but thats all am doing..just change hostname and add SSH keys..thats it

the SSH keys get added fine for centos 8, but hostname not working

fohdeesha

that looks good, and the fact that the VM is properly using the new SSH keys means the config data (and config drive) is properly being formatted and passed to the VM, and the VM is picking it up and using it - which rules out XOA as the source of the issue. It looks like CentOS is choosing to ignore the hostname config, I'm not an experienced centOS user so I have no idea.

encryptblockr

@fohdeesha

yeah for the centos 8 i think am fine with that
the ubuntu one does not work at all
i have my full cloud init config posted here https://xcp-ng.org/forum/topic/2387/how-to-create-single-partition-on-ubuntu-18-04-for-cloud-image/9

gobest20

Maybe a bit late, but I have the same Problem in centos8!

I suppose the reason is a bug in the cloud-init version in Centos8 because of this message:

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/__init__.py", line 733, in find_source
    if s.update_metadata([EventType.BOOT_NEW_INSTANCE]):
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/__init__.py", line 622, in update_metadata
    result = self.get_data()
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/__init__.py", line 256, in get_data
    return_value = self._get_data()
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/DataSourceNoCloud.py", line 126, in _get_data
    mydata = _merge_new_seed(mydata, seeded)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/DataSourceNoCloud.py", line 353, in _merge_new_seed
    util.load_yaml(seeded.get('network-config')))
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/DataSourceNoCloud.py", line 324, in _maybe_remove_top_network
    network_val = cfg.get('network', nullval)
AttributeError: 'NoneType' object has no attribute 'get'

So the trick is, you have to add some content into the network-config
(It doesn't matter if you disable the network config in your cloud.cfg):

#network:
version: 1

And then you can set the hostname in the user-data with

#cloud-config
fqdn: {name}.localdomain.local

Cheers!

stormi

Thanks for sharing.