diff --git a/src-tauri/src/proxmox/ha.rs b/src-tauri/src/proxmox/ha.rs
index 045bf8b5..a1961684 100644
--- a/src-tauri/src/proxmox/ha.rs
+++ b/src-tauri/src/proxmox/ha.rs
@@ -25,18 +25,214 @@ pub struct HaResource {
 
 /// List HA groups
 pub async fn list_ha_groups(
-    _client: &crate::proxmox::client::ProxmoxClient,
-    _ticket: &str,
+    client: &crate::proxmox::client::ProxmoxClient,
+    ticket: &str,
 ) -> Result<Vec<HaGroup>, String> {
-    Err("Not implemented yet".to_string())
+    let path = "cluster/ha/groups";
+    let response: serde_json::Value = client
+        .get(path, Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to list HA groups: {}", e))?;
+
+    if let Some(groups) = response.get("data").and_then(|d| d.as_array()) {
+        let group_list: Vec<HaGroup> = groups
+            .iter()
+            .filter_map(|group| {
+                let name = group.get("group")?.as_str()?.to_string();
+                let nodes: Vec<String> = group
+                    .get("nodes")
+                    .and_then(|n| n.as_array())
+                    .map(|arr| {
+                        arr.iter()
+                            .filter_map(|n| n.as_str().map(|s| s.to_string()))
+                            .collect()
+                    })
+                    .unwrap_or_default();
+                let max_failures = group.get("max_failures")?.as_u64()? as u32;
+                let max_relocate = group.get("max_relocate")?.as_u64()? as u32;
+                let state = group.get("state")?.as_str().unwrap_or("unknown").to_string();
+
+                Some(HaGroup {
+                    group: name,
+                    nodes,
+                    max_failures,
+                    max_relocate,
+                    state,
+                })
+            })
+            .collect();
+
+        Ok(group_list)
+    } else {
+        Err("Invalid response format: missing 'data' field".to_string())
+    }
+}
+
+/// Create HA group
+pub async fn create_ha_group(
+    client: &crate::proxmox::client::ProxmoxClient,
+    group: &str,
+    nodes: &[String],
+    max_failures: u32,
+    max_relocate: u32,
+    ticket: &str,
+) -> Result<(), String> {
+    let path = "cluster/ha/groups";
+    let config = serde_json::json!({
+        "group": group,
+        "nodes": nodes,
+        "max_failures": max_failures,
+        "max_relocate": max_relocate
+    });
+
+    let _response: serde_json::Value = client
+        .post(path, &config, Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to create HA group {}: {}", group, e))?;
+    Ok(())
+}
+
+/// Update HA group
+pub async fn update_ha_group(
+    client: &crate::proxmox::client::ProxmoxClient,
+    group: &str,
+    nodes: &[String],
+    max_failures: u32,
+    max_relocate: u32,
+    ticket: &str,
+) -> Result<(), String> {
+    let path = format!("cluster/ha/groups/{}", group);
+    let config = serde_json::json!({
+        "nodes": nodes,
+        "max_failures": max_failures,
+        "max_relocate": max_relocate
+    });
+
+    let _response: serde_json::Value = client
+        .put(&path, &config, Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to update HA group {}: {}", group, e))?;
+    Ok(())
+}
+
+/// Delete HA group
+pub async fn delete_ha_group(
+    client: &crate::proxmox::client::ProxmoxClient,
+    group: &str,
+    ticket: &str,
+) -> Result<(), String> {
+    let path = format!("cluster/ha/groups/{}", group);
+    let _response: serde_json::Value = client
+        .delete(&path, Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to delete HA group {}: {}", group, e))?;
+    Ok(())
 }
 
 /// List HA resources
 pub async fn list_ha_resources(
-    _client: &crate::proxmox::client::ProxmoxClient,
-    _ticket: &str,
+    client: &crate::proxmox::client::ProxmoxClient,
+    ticket: &str,
 ) -> Result<Vec<HaResource>, String> {
-    Err("Not implemented yet".to_string())
+    let path = "cluster/ha/resources";
+    let response: serde_json::Value = client
+        .get(path, Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to list HA resources: {}", e))?;
+
+    if let Some(resources) = response.get("data").and_then(|d| d.as_array()) {
+        let resource_list: Vec<HaResource> = resources
+            .iter()
+            .filter_map(|resource| {
+                let res = resource.get("resource")?.as_str()?.to_string();
+                let group = resource.get("group").and_then(|g| g.as_str()).map(|s| s.to_string());
+                let node = resource.get("node").and_then(|n| n.as_str()).map(|s| s.to_string());
+                let state = resource.get("state")?.as_str().unwrap_or("unknown").to_string();
+                let enabled = resource.get("enabled").and_then(|e| e.as_bool()).unwrap_or(true);
+
+                Some(HaResource {
+                    resource: res,
+                    group,
+                    node,
+                    state,
+                    enabled,
+                })
+            })
+            .collect();
+
+        Ok(resource_list)
+    } else {
+        Err("Invalid response format: missing 'data' field".to_string())
+    }
+}
+
+/// Enable HA resource
+pub async fn enable_ha_resource(
+    client: &crate::proxmox::client::ProxmoxClient,
+    resource: &str,
+    ticket: &str,
+) -> Result<(), String> {
+    let path = format!("cluster/ha/resources/{}/enable", resource);
+    let _response: serde_json::Value = client
+        .post(&path, &serde_json::json!({}), Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to enable HA resource {}: {}", resource, e))?;
+    Ok(())
+}
+
+/// Disable HA resource
+pub async fn disable_ha_resource(
+    client: &crate::proxmox::client::ProxmoxClient,
+    resource: &str,
+    ticket: &str,
+) -> Result<(), String> {
+    let path = format!("cluster/ha/resources/{}/disable", resource);
+    let _response: serde_json::Value = client
+        .post(&path, &serde_json::json!({}), Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to disable HA resource {}: {}", resource, e))?;
+    Ok(())
+}
+
+/// Manage HA resource
+pub async fn manage_ha_resource(
+    client: &crate::proxmox::client::ProxmoxClient,
+    resource: &str,
+    action: &str,
+    ticket: &str,
+) -> Result<(), String> {
+    let path = format!("cluster/ha/resources/{}/{}", resource, action);
+    let _response: serde_json::Value = client
+        .post(&path, &serde_json::json!({}), Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to manage HA resource {}: {}", resource, e))?;
+    Ok(())
+}
+
+/// Get HA group status
+pub async fn get_ha_group_status(
+    client: &crate::proxmox::client::ProxmoxClient,
+    group: &str,
+    ticket: &str,
+) -> Result<serde_json::Value, String> {
+    let path = format!("cluster/ha/groups/{}/status", group);
+    client
+        .get(&path, Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to get HA group {}: {}", group, e))
+}
+
+/// Get HA resource status
+pub async fn get_ha_resource_status(
+    client: &crate::proxmox::client::ProxmoxClient,
+    resource: &str,
+    ticket: &str,
+) -> Result<serde_json::Value, String> {
+    let path = format!("cluster/ha/resources/{}/status", resource);
+    client
+        .get(&path, Some(ticket))
+        .await
+        .map_err(|e| format!("Failed to get HA resource {}: {}", resource, e))
 }
 
 #[cfg(test)]
@@ -59,4 +255,21 @@ mod tests {
         assert_eq!(group.group, deserialized.group);
         assert_eq!(group.state, "enabled");
     }
+
+    #[test]
+    fn test_ha_resource_serialization() {
+        let resource = HaResource {
+            resource: "vm:100".to_string(),
+            group: Some("primary".to_string()),
+            node: Some("pve-node-1".to_string()),
+            state: "started".to_string(),
+            enabled: true,
+        };
+
+        let json = serde_json::to_string(&resource).unwrap();
+        let deserialized: HaResource = serde_json::from_str(&json).unwrap();
+
+        assert_eq!(resource.resource, deserialized.resource);
+        assert_eq!(resource.enabled, deserialized.enabled);
+    }
 }