From 1d5e9aefdab06a2574d78e644deed6c6fa1da171 Mon Sep 17 00:00:00 2001 From: Chad Smith Date: Wed, 17 Oct 2018 18:47:35 +0000 Subject: azure: Add apply_network_config option to disable network from IMDS MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Azure generates network configuration from the IMDS service and removes any preexisting hotplug network scripts which exist in Azure cloud images. Add a datasource configuration option which allows for writing a default network configuration which sets up dhcp on eth0 and leave the hotplug handling to the cloud-image scripts. To disable network-config from Azure IMDS, add the following to /etc/cloud/cloud.cfg.d/99-azure-no-imds-network.cfg: datasource:   Azure:     apply_network_config: False LP: #1798424 --- doc/rtd/topics/datasources/azure.rst | 46 ++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'doc') diff --git a/doc/rtd/topics/datasources/azure.rst b/doc/rtd/topics/datasources/azure.rst index 559011ef..f73c3694 100644 --- a/doc/rtd/topics/datasources/azure.rst +++ b/doc/rtd/topics/datasources/azure.rst @@ -57,6 +57,52 @@ in order to use waagent.conf with cloud-init, the following settings are recomme ResourceDisk.MountPoint=/mnt +Configuration +------------- +The following configuration can be set for the datasource in system +configuration (in `/etc/cloud/cloud.cfg` or `/etc/cloud/cloud.cfg.d/`). + +The settings that may be configured are: + + * **agent_command**: Either __builtin__ (default) or a command to run to getcw + metadata. If __builtin__, get metadata from walinuxagent. Otherwise run the + provided command to obtain metadata. + * **apply_network_config**: Boolean set to True to use network configuration + described by Azure's IMDS endpoint instead of fallback network config of + dhcp on eth0. Default is True. For Ubuntu 16.04 or earlier, default is False. + * **data_dir**: Path used to read metadata files and write crawled data. + * **dhclient_lease_file**: The fallback lease file to source when looking for + custom DHCP option 245 from Azure fabric. + * **disk_aliases**: A dictionary defining which device paths should be + interpreted as ephemeral images. See cc_disk_setup module for more info. + * **hostname_bounce**: A dictionary Azure hostname bounce behavior to react to + metadata changes. + * **hostname_bounce**: A dictionary Azure hostname bounce behavior to react to + metadata changes. Azure will throttle ifup/down in some cases after metadata + has been updated to inform dhcp server about updated hostnames. + * **set_hostname**: Boolean set to True when we want Azure to set the hostname + based on metadata. + +An example configuration with the default values is provided below: + +.. sourcecode:: yaml + + datasource: + Azure: + agent_command: __builtin__ + apply_network_config: true + data_dir: /var/lib/waagent + dhclient_lease_file: /var/lib/dhcp/dhclient.eth0.leases + disk_aliases: + ephemeral0: /dev/disk/cloud/azure_resource + hostname_bounce: + interface: eth0 + command: builtin + policy: true + hostname_command: hostname + set_hostname: true + + Userdata -------- Userdata is provided to cloud-init inside the ovf-env.xml file. Cloud-init -- cgit v1.2.3