diff --git a/src/config.rs b/src/config.rs
index 83ea0461..94b7fb6c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -20,6 +20,7 @@ pub mod acme;
 pub mod cached_user_info;
 pub mod datastore;
 pub mod network;
+pub mod node;
 pub mod remote;
 pub mod sync;
 pub mod tfa;
diff --git a/src/config/node.rs b/src/config/node.rs
new file mode 100644
index 00000000..7ea85e2d
--- /dev/null
+++ b/src/config/node.rs
@@ -0,0 +1,202 @@
+use std::collections::HashSet;
+use std::fs::File;
+use std::time::Duration;
+
+use anyhow::{bail, format_err, Error};
+use nix::sys::stat::Mode;
+use serde::{Deserialize, Serialize};
+
+use proxmox::api::api;
+use proxmox::api::schema::{self, Updater};
+use proxmox::tools::fs::{replace_file, CreateOptions};
+
+use crate::acme::AcmeClient;
+use crate::config::acme::{AccountName, AcmeDomain};
+
+const CONF_FILE: &str = configdir!("/node.cfg");
+const LOCK_FILE: &str = configdir!("/.node.cfg.lck");
+const LOCK_TIMEOUT: Duration = Duration::from_secs(10);
+
+pub fn lock() -> Result<File, Error> {
+    proxmox::tools::fs::open_file_locked(LOCK_FILE, LOCK_TIMEOUT, true)
+}
+
+/// Read the Node Config.
+pub fn config() -> Result<(NodeConfig, [u8; 32]), Error> {
+    let content =
+        proxmox::tools::fs::file_read_optional_string(CONF_FILE)?.unwrap_or_else(|| "".to_string());
+
+    let digest = openssl::sha::sha256(content.as_bytes());
+    let data: NodeConfig = crate::tools::config::from_str(&content, &NodeConfig::API_SCHEMA)?;
+
+    Ok((data, digest))
+}
+
+/// Write the Node Config, requires the write lock to be held.
+pub fn save_config(config: &NodeConfig) -> Result<(), Error> {
+    config.validate()?;
+
+    let raw = crate::tools::config::to_bytes(config, &NodeConfig::API_SCHEMA)?;
+
+    let backup_user = crate::backup::backup_user()?;
+    let options = CreateOptions::new()
+        .perm(Mode::from_bits_truncate(0o0640))
+        .owner(nix::unistd::ROOT)
+        .group(backup_user.gid);
+
+    replace_file(CONF_FILE, &raw, options)
+}
+
+#[api(
+    properties: {
+        account: { type: AccountName },
+    }
+)]
+#[derive(Deserialize, Serialize)]
+/// The ACME configuration.
+///
+/// Currently only contains the name of the account use.
+pub struct AcmeConfig {
+    /// Account to use to acquire ACME certificates.
+    account: AccountName,
+}
+
+#[api(
+    properties: {
+        acme: {
+            optional: true,
+            type: String,
+            format: &schema::ApiStringFormat::PropertyString(&AcmeConfig::API_SCHEMA),
+        },
+        acmedomain0: {
+            type: String,
+            optional: true,
+            format: &schema::ApiStringFormat::PropertyString(&AcmeDomain::API_SCHEMA),
+        },
+        acmedomain1: {
+            type: String,
+            optional: true,
+            format: &schema::ApiStringFormat::PropertyString(&AcmeDomain::API_SCHEMA),
+        },
+        acmedomain2: {
+            type: String,
+            optional: true,
+            format: &schema::ApiStringFormat::PropertyString(&AcmeDomain::API_SCHEMA),
+        },
+        acmedomain3: {
+            type: String,
+            optional: true,
+            format: &schema::ApiStringFormat::PropertyString(&AcmeDomain::API_SCHEMA),
+        },
+        acmedomain4: {
+            type: String,
+            optional: true,
+            format: &schema::ApiStringFormat::PropertyString(&AcmeDomain::API_SCHEMA),
+        },
+    },
+)]
+#[derive(Deserialize, Serialize, Updater)]
+/// Node specific configuration.
+pub struct NodeConfig {
+    /// The acme account to use on this node.
+    #[serde(skip_serializing_if = "Updater::is_empty")]
+    acme: Option<String>,
+
+    /// ACME domain to get a certificate for for this node.
+    #[serde(skip_serializing_if = "Updater::is_empty")]
+    acmedomain0: Option<String>,
+
+    /// ACME domain to get a certificate for for this node.
+    #[serde(skip_serializing_if = "Updater::is_empty")]
+    acmedomain1: Option<String>,
+
+    /// ACME domain to get a certificate for for this node.
+    #[serde(skip_serializing_if = "Updater::is_empty")]
+    acmedomain2: Option<String>,
+
+    /// ACME domain to get a certificate for for this node.
+    #[serde(skip_serializing_if = "Updater::is_empty")]
+    acmedomain3: Option<String>,
+
+    /// ACME domain to get a certificate for for this node.
+    #[serde(skip_serializing_if = "Updater::is_empty")]
+    acmedomain4: Option<String>,
+}
+
+impl NodeConfig {
+    pub fn acme_config(&self) -> Option<Result<AcmeConfig, Error>> {
+        self.acme.as_deref().map(|config| -> Result<_, Error> {
+            Ok(crate::tools::config::from_property_string(
+                config,
+                &AcmeConfig::API_SCHEMA,
+            )?)
+        })
+    }
+
+    pub async fn acme_client(&self) -> Result<AcmeClient, Error> {
+        AcmeClient::load(
+            &self
+                .acme_config()
+                .ok_or_else(|| format_err!("no acme client configured"))??
+                .account,
+        )
+        .await
+    }
+
+    pub fn acme_domains(&self) -> AcmeDomainIter {
+        AcmeDomainIter::new(self)
+    }
+
+    /// Validate the configuration.
+    pub fn validate(&self) -> Result<(), Error> {
+        let mut domains = HashSet::new();
+        for domain in self.acme_domains() {
+            let domain = domain?;
+            if !domains.insert(domain.domain.to_lowercase()) {
+                bail!("duplicate domain '{}' in ACME config", domain.domain);
+            }
+        }
+
+        Ok(())
+    }
+}
+
+pub struct AcmeDomainIter<'a> {
+    config: &'a NodeConfig,
+    index: usize,
+}
+
+impl<'a> AcmeDomainIter<'a> {
+    fn new(config: &'a NodeConfig) -> Self {
+        Self { config, index: 0 }
+    }
+}
+
+impl<'a> Iterator for AcmeDomainIter<'a> {
+    type Item = Result<AcmeDomain, Error>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let domain = loop {
+            let index = self.index;
+            self.index += 1;
+
+            let domain = match index {
+                0 => self.config.acmedomain0.as_deref(),
+                1 => self.config.acmedomain1.as_deref(),
+                2 => self.config.acmedomain2.as_deref(),
+                3 => self.config.acmedomain3.as_deref(),
+                4 => self.config.acmedomain4.as_deref(),
+                _ => return None,
+            };
+
+            if let Some(domain) = domain {
+                break domain;
+            }
+        };
+
+        Some(crate::tools::config::from_property_string(
+            domain,
+            &AcmeDomain::API_SCHEMA,
+        ))
+    }
+}