Bug 1311655 - cloud-init under OpenNebula works only after reboot
cloud-init under OpenNebula works only after reboot
Product: Fedora
Classification: Fedora
Component: cloud-init (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Garrett Holmstrom
Fedora Extras Quality Assurance
Depends On:
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Reported: 2016-02-24 11:55 EST by Jan "Yenya" Kasprzak
Modified: 2016-10-18 07:29 EDT (History)
8 users (show)

See Also:
Fixed In Version: cloud-init-0.7.8-2.fc25
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2016-10-18 07:29:48 EDT
Type: Bug
Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Description Jan "Yenya" Kasprzak 2016-02-24 11:55:35 EST
Description of problem:
Image contextualization using cloud-init in Fedora 23 under OpenNebula does not set up the desired IPv4 address when the machine is newly deployed. After rebooting the VM using ctrl-alt-del over VNC, the address gets assigned correctly.

Version-Release number of selected component (if applicable):
Fedora-Cloud-Base-23-20151030.x86_64.qcow2 (also tested on manually prepared .qcow2 image created using kickstart of Fedora Server).

How reproducible:
100 %

Steps to Reproduce:
1. Create a Fedora 23 image inside OpenNebula with cloud-init installed, NetworkManager disabled, network enabled, biosdevname disabled, etc. I tried the stock Fedora Cloud image, as well as manually installed F23 Server image.
2. Create a template using this image, enable network contextualization.
3. Deploy one or more instances of this template.

Actual results:
The newly deployed machine is unreachable over the IPv4 network.

Expected results:
The newly deployed machine should use the assigned IPv4 configuration.

Additional info:
- the configuration in the contextualization ISO image gets read somehow, because the hostname of the machine is set to ip-X-Y-A-B.localdomain (X.Y.A.B being the assigned IPv4 address).

- the interface eth0 is up, and gets assigned the IPv6 address including the default IPv6 gateway from the router advertisement packets on my network.

- when I click "Send Ctrl-Alt-Del" in the VNC interface, the VM reboots, and after reboot everything works as expected.

- the contents of the context.sh file is the following (addresses and SSH key replaced):
vm# mount /dev/cdrom /mnt
vm# cat /mnt/context.sh
# Context variables generated by OpenNebula
SSH_PUBLIC_KEY='ssh-rsa AAAA[...]YKQ== me@myhost.org

- the problem is indeed in IPv4 addressing:
vm# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 1234:5678:9012:3456:0:XXff:feYY:AABB  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::XXff:feYY:AABB  prefixlen 64  scopeid 0x20<link>
        ether 02:00:XX:YY:AA:BB  txqueuelen 1000  (Ethernet)
        RX packets 9903  bytes 754531 (736.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 413  bytes 63764 (62.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

- the contextualization is correctly translated to the ifcfg-eth0 file:
vm#  cat /etc/sysconfig/network-scripts/ifcfg-eth0 
# Created by cloud-init v. 0.7.7 on Wed, 24 Feb 2016 09:50:24 +0000

- /etc/resolv.conf contains _two_ nameservers, which - in context of our network - means that it was probably created based on DHCP data and not based on context.sh: 
vm# cat /etc/resolv.conf 
# Generated by NetworkManager
search my.domain
nameserver X.Y.Z.Q
nameserver X.Y.Z.R
Comment 1 Jan "Yenya" Kasprzak 2016-03-16 17:46:56 EDT
OK, the problem is that cloud-init-local.service has no dependency on the network service. The network service (/etc/init.d/network) is started in parallel with cloud-init-local.service, so it grabs whatever was in /etc/sysconfig/network-scripts/ifcfg-eth0 at the time the VM image has been created, sets up the eth0 interface according to it, and some time after it the cloud-init --local creates the proper ifcfg-eth0 file, which will then be used after the reboot.

I think the correct solution would be to have an explicit dependency between cloud-init-local.service and network.service:

--- /tmp/cloud-init-local.service	2016-03-16 22:39:41.570920600 +0100
+++ /usr/lib/systemd/system/cloud-init-local.service	2016-03-16 22:31:10.339623114 +0100
@@ -2,6 +2,7 @@
 Description=Initial cloud-init job (pre-networking)
Comment 2 Jan "Yenya" Kasprzak 2016-03-17 03:42:44 EDT
Apparently upstream already has a similar fix:


They seem to use Before=network-pre.target instead of Before=network.service. Please fix this in F23 - without this, F23 cloud images are unusable with cloud-init image contextualization. Thanks!
Comment 3 Jan "Yenya" Kasprzak 2016-03-30 15:40:06 EDT
Further testing reveals that Before=network-pre.target does not help for F23. Only Before=network.service provides the proper ordering.
Comment 4 Bert JW Regeer (CTL) 2016-09-09 14:41:48 EDT
On CentOS 7 I had to use Before=NetworkManager.service because otherwise NetworkManager would start at the same time as cloud-init-local, and would start managing /etc/resolv.conf instead of using the entries from ConfigDrive in my case (since cloud-init writes those to /etc/resolv.conf directly rather than putting them in ifcg-* scripts where NM could pick them up)

Since it looks like using OpenNebula with context.sh also directly modifies /etc/resolv.conf you'll also run into this issue:

See: https://bugs.launchpad.net/cloud-init/+bug/1620845 and https://bugs.launchpad.net/cloud-init/+bug/1620807
Comment 5 Fedora Update System 2016-10-15 21:55:56 EDT
cloud-init-0.7.8-2.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-e96b704c39
Comment 6 Fedora Update System 2016-10-18 07:29:48 EDT
cloud-init-0.7.8-2.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.

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