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Due to a race condition between the cloud-init application and the NetworkManager utility, systems with cloud-init set up in some cases booted with an incorrect network configuration. This update ensures that the cloud-init-local service runs before NetworkManager starts and that the cloud-init service runs afterwards. As a result, the described problem no longer occurs.
Created attachment 1186987[details]
messages logs
Description of problem:
[clout-init] - cloud-init should finish before NetworkManager starts or run ifdown ifup after cloud-init is finished.
This bug a new and clear version of - BZ 1288819 that was very long and confusing.
The bug is that cloud-init comes up after the NetworkManager and that can cause to some problems like:
cloud-init with static ip configuration can end up that the guest OS is up with ip from dhcp, cause NetworkManager finished first.
The solution should be-
- cloud-init should finish before NetworkManager starts
- run ifdown and ifup after cloud-init finished or run restart network when cloud-init ends
cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
BOOTPROTOv6=dhcp
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=yes
IPV6INIT=yes
PERSISTENT_DHCLIENT=1
NETMASK=255.255.255.0
IPADDR=8.8.8.8
GATEWAY=8.8.8.254
Version-Release number of selected component (if applicable):
cloud-init-0.7.6-6.el7.x86_64
How reproducible:
100
Steps to Reproduce:
1. Create VM with rhel7.2 image and configure the cloud-init with static ip configuration.
It means that the guest should be up with static ip and ifcfg-eth0 with static config.
Actual results:
But from the messages and dmesg logs it is seems like the NetworkManager configures the eth0 nic first(eth0 get ip from dhcp) and only then cloud-init touch the nic.
cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
BOOTPROTOv6=dhcp
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=yes
IPV6INIT=yes
PERSISTENT_DHCLIENT=1
NETMASK=255.255.255.0
IPADDR=8.8.8.8
GATEWAY=8.8.8.254
Expected results:
cloud-init should finish before NetworkManager starts or run ifdown ifup after cloud-init is finished.
Additional info:
To work around it we need to restart network or reboot guest.
See also BZ 1288819
Comment 2Lars Kellogg-Stedman
2016-12-05 15:40:58 UTC
The systemd units in upstream cloud-init have gone through a number of changes recently to improve the ordering of things w/r/t networking. These changes will be available in the next release of our cloud-init package, which I am working on right now.
Comment 3Lars Kellogg-Stedman
2016-12-07 22:59:24 UTC
How are you providing a static ip configuration? If you are doing that via a userdata script, would you please attach that to this bug report? If you are doing that via some other mechanism, let me know. Thanks!
Hello Lars
I'm using the rhv-m ui in order to configure the static ip in the clout-init.
And there is a custom-script in cloud-init via run once or edit vm.
I think that the custom-script should be similar to something like:
network-interfaces: |
auto lo
iface lo inet loopback
iface eth0 inet static
address xxx.xxx.xxx.xxx (static ip)
netmask xxx.xxx.xxx.xxx
gateway xxx.xxx.xxx.xxx (gateway ip, usually ip address of router)
Comment 9Lars Kellogg-Stedman
2017-01-16 14:02:16 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2017:0871