diff --git a/src/domain/config.rs b/src/domain/config.rs
index b7f231b..8a69ed1 100644
--- a/src/domain/config.rs
+++ b/src/domain/config.rs
@@ -1,4 +1,5 @@
 use std::path::{Path, PathBuf};
+use std::str::FromStr;
 use std::{fs, io, sync};
 
 use crate::error::{MapUnexpected, ToUnexpected};
@@ -37,10 +38,14 @@ pub enum SetError {
     Unexpected(#[from] error::Unexpected),
 }
 
+/// Used in the return from all_domains from Store.
+pub type AllDomainsResult<T> = Result<T, error::Unexpected>;
+
 #[mockall::automock]
 pub trait Store {
     fn get(&self, domain: &domain::Name) -> Result<Config, GetError>;
     fn set(&self, domain: &domain::Name, config: &Config) -> Result<(), SetError>;
+    fn all_domains(&self) -> AllDomainsResult<Vec<AllDomainsResult<domain::Name>>>;
 }
 
 pub trait BoxedStore: Store + Send + Sync + Clone {}
@@ -89,6 +94,22 @@ impl Store for sync::Arc<FSStore> {
 
         Ok(())
     }
+
+    fn all_domains(&self) -> AllDomainsResult<Vec<AllDomainsResult<domain::Name>>> {
+        Ok(fs::read_dir(&self.dir_path)
+            .map_unexpected()?
+            .map(
+                |dir_entry_res: io::Result<fs::DirEntry>| -> AllDomainsResult<domain::Name> {
+                    let domain = dir_entry_res.map_unexpected()?.file_name();
+                    let domain = domain.to_str().ok_or_else(|| {
+                        error::Unexpected::from("couldn't convert os string to &str")
+                    })?;
+
+                    Ok(domain::Name::from_str(domain).map_unexpected()?)
+                },
+            )
+            .collect())
+    }
 }
 
 #[cfg(test)]
diff --git a/src/domain/manager.rs b/src/domain/manager.rs
index 8b9515b..26db366 100644
--- a/src/domain/manager.rs
+++ b/src/domain/manager.rs
@@ -115,6 +115,8 @@ impl From<config::SetError> for SyncWithConfigError {
 
 pub type GetAcmeHttp01ChallengeKeyError = acme::manager::GetHttp01ChallengeKeyError;
 
+pub type AllDomainsResult<T> = config::AllDomainsResult<T>;
+
 #[mockall::automock(
     type Origin=origin::MockOrigin;
     type SyncWithConfigFuture=future::Ready<Result<(), SyncWithConfigError>>;
@@ -153,6 +155,8 @@ pub trait Manager {
         &self,
         token: &str,
     ) -> Result<String, GetAcmeHttp01ChallengeKeyError>;
+
+    fn all_domains(&self) -> AllDomainsResult<Vec<AllDomainsResult<domain::Name>>>;
 }
 
 pub trait BoxedManager: Manager + Send + Sync + Clone {}
@@ -283,4 +287,8 @@ where
 
         Err(GetAcmeHttp01ChallengeKeyError::NotFound)
     }
+
+    fn all_domains(&self) -> AllDomainsResult<Vec<AllDomainsResult<domain::Name>>> {
+        self.domain_config_store.all_domains()
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index 5f3de3e..9598638 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -158,7 +158,7 @@ fn main() {
     });
 
     let service = domiply::service::new(
-        manager,
+        manager.clone(),
         config.domain_checker_target_a,
         config.passphrase,
         config.http_domain.clone(),
@@ -181,6 +181,7 @@ fn main() {
 
     wait_group.push({
         let http_domain = config.http_domain.clone();
+        let canceller = canceller.clone();
 
         tokio_runtime.spawn(async move {
             let addr = config.http_listen_addr;
@@ -205,18 +206,54 @@ fn main() {
     // if there's an acme manager then it means that https is enabled, and we should ensure that
     // the http domain for domiply itself has a valid certificate.
     if let Some(domain_acme_manager) = domain_acme_manager {
+        let manager = manager.clone();
+        let canceller = canceller.clone();
         let http_domain = config.http_domain.clone();
 
+        // Periodically refresh all domain certs
         wait_group.push(tokio_runtime.spawn(async move {
-            _ = domain_acme_manager
-                .sync_domain(http_domain.clone())
-                .await
-                .inspect_err(|err| {
-                    println!(
-                        "Error while getting cert for {}: {err}",
-                        http_domain.as_str()
-                    )
-                });
+            let mut interval = time::interval(time::Duration::from_secs(60 * 60));
+
+            loop {
+                select! {
+                _ = interval.tick() => (),
+                _ = canceller.cancelled() => return,
+                }
+
+                _ = domain_acme_manager
+                    .sync_domain(http_domain.clone())
+                    .await
+                    .inspect_err(|err| {
+                        println!(
+                            "Error while getting cert for {}: {err}",
+                            http_domain.as_str()
+                        )
+                    });
+
+                let domains_iter = manager.all_domains();
+
+                if let Err(err) = domains_iter {
+                    println!("Got error calling all_domains: {err}");
+                    continue;
+                }
+
+                for domain in domains_iter.unwrap().into_iter() {
+                    match domain {
+                        Ok(domain) => {
+                            let _ = domain_acme_manager
+                                .sync_domain(domain.clone())
+                                .await
+                                .inspect_err(|err| {
+                                    println!(
+                                        "Error while getting cert for {}: {err}",
+                                        domain.as_str(),
+                                    )
+                                });
+                        }
+                        Err(err) => println!("Error iterating through domains: {err}"),
+                    };
+                }
+            }
         }));
     }