ucloud-host can not be started by using hostname

docs/source/index.rst

@@ -12,6 +12,7 @@ Welcome to ucloud's documentation!
 
    introduction/introduction
    introduction/installation
+   introduction/usage
 
 Indices and tables
 ==================

docs/source/introduction/installation.rst

@@ -184,17 +184,3 @@ profile e.g *~/.profile*
     alias uotp='cd /root/uotp/ && pipenv run python app.py'
 
 and run :code:`source ~/.profile`
-
-
-Running ucloud
-~~~~~~~~~~~~~~
-
-.. code-block:: sh
-
-    ucloud api
-
-We need to create a host by executing the following command
-
-.. code-block:: sh
-    
-    

docs/source/introduction/usage.rst

@@ -0,0 +1,35 @@
+Usage
+=====
+
+Start API
+----------
+
+.. code-block:: sh
+
+    ucloud api
+
+Host Creation
+-------------
+
+Currently, we don't have any host (that runs virtual machines). 
+So, we need to create it by executing the following command
+
+.. code-block:: sh
+    
+    ucloud-cli host create --hostname ungleich.ch --cpu 32 --ram '32GB' --os-ssd '32GB'
+
+You should see something like the following
+
+.. code-block:: json
+
+    {
+        "message": "Host Created"
+    }
+
+Start Scheduler
+---------------
+
+.. code-block:: sh
+
+    ucloud scheduler
+

host/main.py

@@ -19,8 +19,8 @@ import etcd3
 def update_heartbeat(host):
     client = Etcd3Wrapper(*etcd_wrapper_args, **etcd_wrapper_kwargs)
     host_pool = HostPool(client, HOST_PREFIX)
-    this_host = host_pool.get(host)
-
+    this_host = next(filter(lambda h: h.hostname == host, host_pool.hosts), None)
+    
     while True:
         this_host.update_heartbeat()
         host_pool.put(this_host)
@@ -78,8 +78,8 @@ def main():
     heartbeat_updating_process = mp.Process(target=update_heartbeat, args=(args.hostname,))
 
     host_pool = HostPool(etcd_client, HOST_PREFIX)
-    host = host_pool.get(args.hostname)
-    assert host, "No such host"
+    host = next(filter(lambda h: h.hostname == args.hostname, host_pool.hosts), None)
+    assert host is not None, "No such host"
 
     try:
         heartbeat_updating_process.start()