nixpkgs/nixos/modules/virtualisation/azure-agent.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.virtualisation.azure.agent;
provisionedHook = pkgs.writeScript "provisioned-hook" ''
#!${pkgs.runtimeShell}
/run/current-system/systemd/bin/systemctl start provisioned.target
'';
in
{
###### interface
options.virtualisation.azure.agent = {
enable = mkOption {
default = false;
description = lib.mdDoc "Whether to enable the Windows Azure Linux Agent.";
};
verboseLogging = mkOption {
default = false;
description = lib.mdDoc "Whether to enable verbose logging.";
};
mountResourceDisk = mkOption {
default = true;
description = lib.mdDoc "Whether the agent should format (ext4) and mount the resource disk to /mnt/resource.";
};
};
###### implementation
config = lib.mkIf cfg.enable {
assertions = [{
assertion = pkgs.stdenv.hostPlatform.isx86;
message = "Azure not currently supported on ${pkgs.stdenv.hostPlatform.system}";
}
{
assertion = config.networking.networkmanager.enable == false;
message = "Windows Azure Linux Agent is not compatible with NetworkManager";
}];
boot.initrd.kernelModules = [ "ata_piix" ];
networking.firewall.allowedUDPPorts = [ 68 ];
environment.etc."waagent.conf".text = ''
#
# Microsoft Azure Linux Agent Configuration
#
# Enable extension handling. Do not disable this unless you do not need password reset,
# backup, monitoring, or any extension handling whatsoever.
Extensions.Enabled=y
# How often (in seconds) to poll for new goal states
Extensions.GoalStatePeriod=6
# Which provisioning agent to use. Supported values are "auto" (default), "waagent",
# "cloud-init", or "disabled".
Provisioning.Agent=disabled
# Password authentication for root account will be unavailable.
Provisioning.DeleteRootPassword=n
# Generate fresh host key pair.
Provisioning.RegenerateSshHostKeyPair=n
# Supported values are "rsa", "dsa", "ecdsa", "ed25519", and "auto".
# The "auto" option is supported on OpenSSH 5.9 (2011) and later.
Provisioning.SshHostKeyPairType=ed25519
# Monitor host name changes and publish changes via DHCP requests.
Provisioning.MonitorHostName=y
# How often (in seconds) to monitor host name changes.
Provisioning.MonitorHostNamePeriod=30
# Decode CustomData from Base64.
Provisioning.DecodeCustomData=n
# Execute CustomData after provisioning.
Provisioning.ExecuteCustomData=n
# Algorithm used by crypt when generating password hash.
#Provisioning.PasswordCryptId=6
# Length of random salt used when generating password hash.
#Provisioning.PasswordCryptSaltLength=10
# Allow reset password of sys user
Provisioning.AllowResetSysUser=n
# Format if unformatted. If 'n', resource disk will not be mounted.
ResourceDisk.Format=${if cfg.mountResourceDisk then "y" else "n"}
# File system on the resource disk
# Typically ext3 or ext4. FreeBSD images should use 'ufs2' here.
ResourceDisk.Filesystem=ext4
# Mount point for the resource disk
ResourceDisk.MountPoint=/mnt/resource
# Create and use swapfile on resource disk.
ResourceDisk.EnableSwap=n
# Size of the swapfile.
ResourceDisk.SwapSizeMB=0
# Comma-separated list of mount options. See mount(8) for valid options.
ResourceDisk.MountOptions=None
# Enable verbose logging (y|n)
Logs.Verbose=${if cfg.verboseLogging then "y" else "n"}
# Enable Console logging, default is y
# Logs.Console=y
# Enable periodic log collection, default is n
Logs.Collect=n
# How frequently to collect logs, default is each hour
Logs.CollectPeriod=3600
# Is FIPS enabled
OS.EnableFIPS=n
# Root device timeout in seconds.
OS.RootDeviceScsiTimeout=300
# How often (in seconds) to set the root device timeout.
OS.RootDeviceScsiTimeoutPeriod=30
# If "None", the system default version is used.
OS.OpensslPath=${pkgs.openssl_3.bin}/bin/openssl
# Set the SSH ClientAliveInterval
# OS.SshClientAliveInterval=180
# Set the path to SSH keys and configuration files
OS.SshDir=/etc/ssh
# If set, agent will use proxy server to access internet
#HttpProxy.Host=None
#HttpProxy.Port=None
# Detect Scvmm environment, default is n
# DetectScvmmEnv=n
#
# Lib.Dir=/var/lib/waagent
#
# DVD.MountPoint=/mnt/cdrom/secure
#
# Pid.File=/var/run/waagent.pid
#
# Extension.LogDir=/var/log/azure
#
# Home.Dir=/home
# Enable RDMA management and set up, should only be used in HPC images
OS.EnableRDMA=n
# Enable checking RDMA driver version and update
# OS.CheckRdmaDriver=y
# Enable or disable goal state processing auto-update, default is enabled
AutoUpdate.Enabled=n
# Determine the update family, this should not be changed
# AutoUpdate.GAFamily=Prod
# Determine if the overprovisioning feature is enabled. If yes, hold extension
# handling until inVMArtifactsProfile.OnHold is false.
# Default is enabled
EnableOverProvisioning=n
# Allow fallback to HTTP if HTTPS is unavailable
# Note: Allowing HTTP (vs. HTTPS) may cause security risks
# OS.AllowHTTP=n
# Add firewall rules to protect access to Azure host node services
OS.EnableFirewall=n
# How often (in seconds) to check the firewall rules
OS.EnableFirewallPeriod=30
# How often (in seconds) to remove the udev rules for persistent network interface
# names (75-persistent-net-generator.rules and /etc/udev/rules.d/70-persistent-net.rules)
OS.RemovePersistentNetRulesPeriod=30
# How often (in seconds) to monitor for DHCP client restarts
OS.MonitorDhcpClientRestartPeriod=30
'';
services.udev.packages = [ pkgs.waagent ];
networking.dhcpcd.persistent = true;
services.logrotate = {
enable = true;
settings."/var/log/waagent.log" = {
compress = true;
frequency = "monthly";
rotate = 6;
};
};
systemd.targets.provisioned = {
description = "Services Requiring Azure VM provisioning to have finished";
};
systemd.services.consume-hypervisor-entropy =
{
description = "Consume entropy in ACPI table provided by Hyper-V";
wantedBy = [ "sshd.service" "waagent.service" ];
before = [ "sshd.service" "waagent.service" ];
path = [ pkgs.coreutils ];
script =
''
echo "Fetching entropy..."
cat /sys/firmware/acpi/tables/OEM0 > /dev/random
'';
serviceConfig.Type = "oneshot";
serviceConfig.RemainAfterExit = true;
serviceConfig.StandardError = "journal+console";
serviceConfig.StandardOutput = "journal+console";
};
systemd.services.waagent = {
wantedBy = [ "multi-user.target" ];
after = [ "network-online.target" "sshd.service" ];
wants = [ "network-online.target" ];
path = [ pkgs.e2fsprogs pkgs.bash ];
description = "Windows Azure Agent Service";
unitConfig.ConditionPathExists = "/etc/waagent.conf";
serviceConfig = {
ExecStart = "${pkgs.waagent}/bin/waagent -daemon";
Type = "simple";
};
};
};
}