diff --git a/Dockerfile b/Dockerfile
index 7cf768d85..9c0cd9dbf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@ RUN useradd jumpserver
 RUN yum -y install epel-release && \
       echo -e "[mysql]\nname=mysql\nbaseurl=${MYSQL_MIRROR}\ngpgcheck=0\nenabled=1" > /etc/yum.repos.d/mysql.repo
 RUN yum -y install $(cat requirements/rpm_requirements.txt)
-RUN pip install --upgrade pip setuptools wheel -i ${PIP_MIRROR} && \
+RUN pip install --upgrade pip setuptools==49.6.0 wheel -i ${PIP_MIRROR} && \
     pip config set global.index-url ${PIP_MIRROR}
 RUN pip install -r requirements/requirements.txt || pip install -r requirements/requirements.txt
 
diff --git a/README.md b/README.md
index 326b50260..30befbf73 100644
--- a/README.md
+++ b/README.md
@@ -206,6 +206,12 @@ v2.1.0 是 v2.0.0 之后的功能版本。
 - [完整文档](https://docs.jumpserver.org)
 - [演示视频](https://jumpserver.oss-cn-hangzhou.aliyuncs.com/jms-media/%E3%80%90%E6%BC%94%E7%A4%BA%E8%A7%86%E9%A2%91%E3%80%91Jumpserver%20%E5%A0%A1%E5%9E%92%E6%9C%BA%20V1.5.0%20%E6%BC%94%E7%A4%BA%E8%A7%86%E9%A2%91%20-%20final.mp4)
 
+## 组件项目
+- [Lina](https://github.com/jumpserver/lina) JumpServer Web UI 项目
+- [Luna](https://github.com/jumpserver/luna) JumpServer Web Terminal 项目
+- [Koko](https://github.com/jumpserver/koko) JumpServer 字符协议 Connector 项目，替代原来 Python 版本的 [Coco](https://github.com/jumpserver/coco)
+- [Guacamole](https://github.com/jumpserver/docker-guacamole) JumpServer 图形协议 Connector 项目，依赖 [Apache Guacamole](https://guacamole.apache.org/)
+
 ## JumpServer 企业版 
 - [申请企业版试用](https://jinshuju.net/f/kyOYpi)
 > 注：企业版支持离线安装，申请通过后会提供高速下载链接。
diff --git a/apps/audits/tasks.py b/apps/audits/tasks.py
index 2dfe4a2dd..d928e6e87 100644
--- a/apps/audits/tasks.py
+++ b/apps/audits/tasks.py
@@ -16,7 +16,7 @@ def clean_login_log_period():
     try:
         days = int(settings.LOGIN_LOG_KEEP_DAYS)
     except ValueError:
-        days = 90
+        days = 9999
     expired_day = now - datetime.timedelta(days=days)
     UserLoginLog.objects.filter(datetime__lt=expired_day).delete()
 
@@ -28,6 +28,6 @@ def clean_operation_log_period():
     try:
         days = int(settings.LOGIN_LOG_KEEP_DAYS)
     except ValueError:
-        days = 90
+        days = 9999
     expired_day = now - datetime.timedelta(days=days)
     OperateLog.objects.filter(datetime__lt=expired_day).delete()
diff --git a/apps/authentication/signals_handlers.py b/apps/authentication/signals_handlers.py
index 461ddbb99..dc6bf5e27 100644
--- a/apps/authentication/signals_handlers.py
+++ b/apps/authentication/signals_handlers.py
@@ -1,3 +1,8 @@
+from importlib import import_module
+
+from django.conf import settings
+from django.contrib.auth import user_logged_in
+from django.core.cache import cache
 from django.dispatch import receiver
 
 from jms_oidc_rp.signals import openid_user_login_failed, openid_user_login_success
@@ -5,6 +10,17 @@ from jms_oidc_rp.signals import openid_user_login_failed, openid_user_login_succ
 from .signals import post_auth_success, post_auth_failed
 
 
+@receiver(user_logged_in)
+def on_user_auth_login_success(sender, user, request, **kwargs):
+    if settings.USER_LOGIN_SINGLE_MACHINE_ENABLED:
+        user_id = 'single_machine_login_' + str(user.id)
+        session_key = cache.get(user_id)
+        if session_key and session_key != request.session.session_key:
+            session = import_module(settings.SESSION_ENGINE).SessionStore(session_key)
+            session.delete()
+        cache.set(user_id, request.session.session_key, None)
+
+
 @receiver(openid_user_login_success)
 def on_oidc_user_login_success(sender, request, user, **kwargs):
     post_auth_success.send(sender, user=user, request=request)
diff --git a/apps/common/fields/model.py b/apps/common/fields/model.py
index 945a98ea4..b4ac41b2f 100644
--- a/apps/common/fields/model.py
+++ b/apps/common/fields/model.py
@@ -5,7 +5,7 @@ from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.utils.encoding import force_text
 
-from ..utils import signer, aes_crypto
+from ..utils import signer, aes_crypto, aes_ecb_crypto
 
 
 __all__ = [
@@ -117,9 +117,17 @@ class EncryptMixin:
         return signer.unsign(value) or ''
 
     def decrypt_from_aes(self, value):
+        """
+        先尝试使用GCM模式解密，如果解不开，再尝试使用原来的ECB模式解密
+        """
         try:
             return aes_crypto.decrypt(value)
-        except (TypeError, ValueError):
+        except ValueError:
+            pass
+
+        try:
+            return aes_ecb_crypto.decrypt(value)
+        except (TypeError, ValueError, UnicodeDecodeError):
             pass
 
     def from_db_value(self, value, expression, connection, context):
diff --git a/apps/common/tasks.py b/apps/common/tasks.py
index aecc54ca7..eeeee7214 100644
--- a/apps/common/tasks.py
+++ b/apps/common/tasks.py
@@ -24,7 +24,7 @@ def send_mail_async(*args, **kwargs):
     """
     if len(args) == 3:
         args = list(args)
-        args[0] = settings.EMAIL_SUBJECT_PREFIX + args[0]
+        args[0] = (settings.EMAIL_SUBJECT_PREFIX or '') + args[0]
         email_from = settings.EMAIL_FROM or settings.EMAIL_HOST_USER
         args.insert(2, email_from)
         args = tuple(args)
diff --git a/apps/common/utils/crypto.py b/apps/common/utils/crypto.py
index ea3590d6c..31991c93c 100644
--- a/apps/common/utils/crypto.py
+++ b/apps/common/utils/crypto.py
@@ -1,5 +1,7 @@
 import base64
 from Crypto.Cipher import AES
+from Crypto.Util.Padding import pad
+from Crypto.Random import get_random_bytes
 
 from django.conf import settings
 
@@ -44,11 +46,69 @@ class AESCrypto:
         return str(aes.decrypt(base64.decodebytes(bytes(text, encoding='utf8'))).rstrip(b'\0').decode("utf8"))  # 解密
 
 
-def get_aes_crypto(key=None):
+class AESCryptoGCM:
+    """
+    使用AES GCM模式
+    """
+
+    def __init__(self, key):
+        self.key = self.process_key(key)
+
+    @staticmethod
+    def process_key(key):
+        """
+        返回32 bytes 的key
+        """
+        if not isinstance(key, bytes):
+            key = bytes(key, encoding='utf-8')
+
+        if len(key) >= 32:
+            return key[:32]
+
+        return pad(key, 32)
+
+    def encrypt(self, text):
+        """
+        加密text，并将 header, nonce, tag (3*16 bytes, base64后变为 3*24 bytes)
+        附在密文前。解密时要用到。
+        """
+        header = get_random_bytes(16)
+        cipher = AES.new(self.key, AES.MODE_GCM)
+        cipher.update(header)
+        ciphertext, tag = cipher.encrypt_and_digest(bytes(text, encoding='utf-8'))
+
+        result = []
+        for byte_data in (header, cipher.nonce, tag, ciphertext):
+            result.append(base64.b64encode(byte_data).decode('utf-8'))
+
+        return ''.join(result)
+
+    def decrypt(self, text):
+        """
+        提取header, nonce, tag并解密text。
+        """
+        metadata = text[:72]
+        header = base64.b64decode(metadata[:24])
+        nonce = base64.b64decode(metadata[24:48])
+        tag = base64.b64decode(metadata[48:])
+        ciphertext = base64.b64decode(text[72:])
+
+        cipher = AES.new(self.key, AES.MODE_GCM, nonce=nonce)
+
+        cipher.update(header)
+        plain_text_bytes = cipher.decrypt_and_verify(ciphertext, tag)
+        return plain_text_bytes.decode('utf-8')
+
+
+def get_aes_crypto(key=None, mode='GCM'):
     if key is None:
         key = settings.SECRET_KEY
-    a = AESCrypto(key)
+    if mode == 'ECB':
+        a = AESCrypto(key)
+    elif mode == 'GCM':
+        a = AESCryptoGCM(key)
     return a
 
 
-aes_crypto = get_aes_crypto()
+aes_ecb_crypto = get_aes_crypto(mode='ECB')
+aes_crypto = get_aes_crypto(mode='GCM')
diff --git a/apps/jumpserver/conf.py b/apps/jumpserver/conf.py
index dcbf439da..0e186726e 100644
--- a/apps/jumpserver/conf.py
+++ b/apps/jumpserver/conf.py
@@ -266,7 +266,8 @@ class Config(dict):
         'ORG_CHANGE_TO_URL': '',
         'LANGUAGE_CODE': 'zh',
         'TIME_ZONE': 'Asia/Shanghai',
-        'CHANGE_AUTH_PLAN_SECURE_MODE_ENABLED': True
+        'CHANGE_AUTH_PLAN_SECURE_MODE_ENABLED': True,
+        'USER_LOGIN_SINGLE_MACHINE_ENABLED': False
     }
 
     def compatible_auth_openid_of_key(self):
diff --git a/apps/jumpserver/settings/custom.py b/apps/jumpserver/settings/custom.py
index b691d3ce5..5149c3d9c 100644
--- a/apps/jumpserver/settings/custom.py
+++ b/apps/jumpserver/settings/custom.py
@@ -70,6 +70,9 @@ FLOWER_URL = CONFIG.FLOWER_URL
 # Enable internal period task
 PERIOD_TASK_ENABLED = CONFIG.PERIOD_TASK_ENABLED
 
+# only allow single machine login with the same account
+USER_LOGIN_SINGLE_MACHINE_ENABLED = CONFIG.USER_LOGIN_SINGLE_MACHINE_ENABLED
+
 # Email custom content
 EMAIL_SUBJECT_PREFIX = DYNAMIC.EMAIL_SUBJECT_PREFIX
 EMAIL_SUFFIX = DYNAMIC.EMAIL_SUFFIX
diff --git a/apps/locale/zh/LC_MESSAGES/django.mo b/apps/locale/zh/LC_MESSAGES/django.mo
index e0e23c4e4..0a5f32daf 100644
Binary files a/apps/locale/zh/LC_MESSAGES/django.mo and b/apps/locale/zh/LC_MESSAGES/django.mo differ
diff --git a/apps/locale/zh/LC_MESSAGES/django.po b/apps/locale/zh/LC_MESSAGES/django.po
index ec532c0b6..3b5624384 100644
--- a/apps/locale/zh/LC_MESSAGES/django.po
+++ b/apps/locale/zh/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: JumpServer 0.3.3\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-08-19 18:10+0800\n"
+"POT-Creation-Date: 2020-09-07 16:23+0800\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: ibuler <ibuler@qq.com>\n"
 "Language-Team: JumpServer team<ibuler@qq.com>\n"
@@ -29,7 +29,7 @@ msgstr "自定义"
 #: orgs/models.py:22 perms/models/base.py:48 settings/models.py:27
 #: terminal/models.py:27 terminal/models.py:344 terminal/models.py:376
 #: terminal/models.py:413 users/forms/profile.py:20 users/models/group.py:15
-#: users/models/user.py:491 users/templates/users/_select_user_modal.html:13
+#: users/models/user.py:501 users/templates/users/_select_user_modal.html:13
 #: users/templates/users/user_asset_permission.html:37
 #: users/templates/users/user_asset_permission.html:154
 #: users/templates/users/user_database_app_permission.html:36
@@ -42,7 +42,7 @@ msgstr "自定义"
 #: users/templates/users/user_profile.html:51
 #: users/templates/users/user_pubkey_update.html:57
 #: users/templates/users/user_remote_app_permission.html:36
-#: xpack/plugins/cloud/models.py:35
+#: xpack/plugins/cloud/models.py:36
 msgid "Name"
 msgstr "名称"
 
@@ -79,14 +79,14 @@ msgstr "数据库"
 #: assets/models/label.py:23 ops/models/adhoc.py:37 orgs/models.py:25
 #: perms/models/base.py:56 settings/models.py:32 terminal/models.py:37
 #: terminal/models.py:383 terminal/models.py:420 users/models/group.py:16
-#: users/models/user.py:524 users/templates/users/user_detail.html:115
+#: users/models/user.py:534 users/templates/users/user_detail.html:115
 #: users/templates/users/user_granted_database_app.html:38
 #: users/templates/users/user_granted_remote_app.html:37
 #: users/templates/users/user_group_detail.html:62
 #: users/templates/users/user_group_list.html:16
 #: users/templates/users/user_profile.html:138
-#: xpack/plugins/change_auth_plan/models.py:77 xpack/plugins/cloud/models.py:53
-#: xpack/plugins/cloud/models.py:140 xpack/plugins/gathered_user/models.py:26
+#: xpack/plugins/change_auth_plan/models.py:77 xpack/plugins/cloud/models.py:54
+#: xpack/plugins/cloud/models.py:149 xpack/plugins/gathered_user/models.py:26
 msgid "Comment"
 msgstr "备注"
 
@@ -125,7 +125,7 @@ msgstr "Kubernetes应用"
 #: users/templates/users/user_asset_permission.html:70
 #: users/templates/users/user_granted_remote_app.html:36
 #: xpack/plugins/change_auth_plan/models.py:283
-#: xpack/plugins/cloud/models.py:266
+#: xpack/plugins/cloud/models.py:275
 msgid "Asset"
 msgstr "资产"
 
@@ -147,10 +147,10 @@ msgstr "参数"
 #: assets/models/cmd_filter.py:26 assets/models/cmd_filter.py:60
 #: assets/models/group.py:21 common/db/models.py:67 common/mixins/models.py:49
 #: orgs/models.py:23 orgs/models.py:389 perms/models/base.py:54
-#: users/models/user.py:532 users/serializers/group.py:35
+#: users/models/user.py:542 users/serializers/group.py:35
 #: users/templates/users/user_detail.html:97
-#: xpack/plugins/change_auth_plan/models.py:81 xpack/plugins/cloud/models.py:56
-#: xpack/plugins/cloud/models.py:146 xpack/plugins/gathered_user/models.py:30
+#: xpack/plugins/change_auth_plan/models.py:81 xpack/plugins/cloud/models.py:57
+#: xpack/plugins/cloud/models.py:155 xpack/plugins/gathered_user/models.py:30
 msgid "Created by"
 msgstr "创建者"
 
@@ -163,7 +163,7 @@ msgstr "创建者"
 #: common/mixins/models.py:50 ops/models/adhoc.py:38 ops/models/command.py:27
 #: orgs/models.py:24 orgs/models.py:387 perms/models/base.py:55
 #: users/models/group.py:18 users/templates/users/user_group_detail.html:58
-#: xpack/plugins/cloud/models.py:59 xpack/plugins/cloud/models.py:149
+#: xpack/plugins/cloud/models.py:60 xpack/plugins/cloud/models.py:158
 msgid "Date created"
 msgstr "创建日期"
 
@@ -196,7 +196,7 @@ msgstr "不能移除资产的管理用户账号"
 msgid "Latest version could not be delete"
 msgstr "最新版本的不能被删除"
 
-#: assets/models/asset.py:146 xpack/plugins/cloud/providers/base.py:16
+#: assets/models/asset.py:146 xpack/plugins/cloud/providers/base.py:17
 msgid "Base"
 msgstr "基础"
 
@@ -262,7 +262,7 @@ msgstr "激活"
 
 #: assets/models/asset.py:199 assets/models/cluster.py:19
 #: assets/models/user.py:66 templates/_nav.html:44
-#: xpack/plugins/cloud/models.py:133 xpack/plugins/cloud/serializers.py:83
+#: xpack/plugins/cloud/models.py:142 xpack/plugins/cloud/serializers.py:84
 msgid "Admin user"
 msgstr "管理用户"
 
@@ -354,7 +354,7 @@ msgstr ""
 #: audits/models.py:99 authentication/forms.py:11
 #: authentication/templates/authentication/login.html:21
 #: authentication/templates/authentication/xpack_login.html:101
-#: ops/models/adhoc.py:148 users/forms/profile.py:19 users/models/user.py:489
+#: ops/models/adhoc.py:148 users/forms/profile.py:19 users/models/user.py:499
 #: users/templates/users/_select_user_modal.html:14
 #: users/templates/users/user_detail.html:53
 #: users/templates/users/user_list.html:15
@@ -407,7 +407,7 @@ msgstr "带宽"
 msgid "Contact"
 msgstr "联系人"
 
-#: assets/models/cluster.py:22 users/models/user.py:510
+#: assets/models/cluster.py:22 users/models/user.py:520
 #: users/templates/users/user_detail.html:62
 msgid "Phone"
 msgstr "手机"
@@ -433,7 +433,7 @@ msgid "Default"
 msgstr "默认"
 
 #: assets/models/cluster.py:36 assets/models/label.py:14
-#: users/models/user.py:657
+#: users/models/user.py:661
 msgid "System"
 msgstr "系统"
 
@@ -547,7 +547,7 @@ msgstr "默认资产组"
 
 #: assets/models/label.py:15 audits/models.py:36 audits/models.py:56
 #: audits/models.py:69 audits/serializers.py:77 authentication/models.py:46
-#: authentication/models.py:90 orgs/models.py:16 orgs/models.py:385
+#: authentication/models.py:90 orgs/models.py:17 orgs/models.py:385
 #: perms/forms/asset_permission.py:83 perms/forms/database_app_permission.py:38
 #: perms/forms/remote_app_permission.py:40 perms/models/base.py:49
 #: templates/index.html:78 terminal/backends/command/models.py:18
@@ -555,7 +555,7 @@ msgstr "默认资产组"
 #: tickets/models/ticket.py:30 tickets/models/ticket.py:137
 #: tickets/serializers/request_asset_perm.py:65
 #: tickets/serializers/ticket.py:31 users/forms/group.py:15
-#: users/models/user.py:158 users/models/user.py:645
+#: users/models/user.py:159 users/models/user.py:649
 #: users/serializers/group.py:20
 #: users/templates/users/user_asset_permission.html:38
 #: users/templates/users/user_asset_permission.html:64
@@ -603,7 +603,7 @@ msgstr "键"
 #: users/templates/users/user_asset_permission.html:41
 #: users/templates/users/user_asset_permission.html:73
 #: users/templates/users/user_asset_permission.html:158
-#: xpack/plugins/cloud/models.py:129 xpack/plugins/cloud/serializers.py:84
+#: xpack/plugins/cloud/models.py:138 xpack/plugins/cloud/serializers.py:85
 msgid "Node"
 msgstr "节点"
 
@@ -733,14 +733,14 @@ msgid "Backend"
 msgstr "后端"
 
 #: assets/serializers/asset_user.py:75 users/forms/profile.py:148
-#: users/models/user.py:521 users/templates/users/user_password_update.html:48
+#: users/models/user.py:531 users/templates/users/user_password_update.html:48
 #: users/templates/users/user_profile.html:69
 #: users/templates/users/user_profile_update.html:46
 #: users/templates/users/user_pubkey_update.html:46
 msgid "Public key"
 msgstr "SSH公钥"
 
-#: assets/serializers/asset_user.py:79 users/models/user.py:518
+#: assets/serializers/asset_user.py:79 users/models/user.py:528
 msgid "Private key"
 msgstr "ssh私钥"
 
@@ -1002,7 +1002,7 @@ msgstr "启用"
 msgid "-"
 msgstr ""
 
-#: audits/models.py:96 xpack/plugins/cloud/models.py:201
+#: audits/models.py:96 xpack/plugins/cloud/models.py:210
 msgid "Failed"
 msgstr "失败"
 
@@ -1025,20 +1025,20 @@ msgstr "Agent"
 #: audits/models.py:104
 #: authentication/templates/authentication/_mfa_confirm_modal.html:14
 #: authentication/templates/authentication/login_otp.html:6
-#: users/forms/profile.py:52 users/models/user.py:513
-#: users/serializers/user.py:240 users/templates/users/user_detail.html:77
+#: users/forms/profile.py:52 users/models/user.py:523
+#: users/serializers/user.py:229 users/templates/users/user_detail.html:77
 #: users/templates/users/user_profile.html:87
 msgid "MFA"
 msgstr "多因子认证"
 
 #: audits/models.py:105 xpack/plugins/change_auth_plan/models.py:304
-#: xpack/plugins/cloud/models.py:214
+#: xpack/plugins/cloud/models.py:223
 msgid "Reason"
 msgstr "原因"
 
 #: audits/models.py:106 tickets/serializers/request_asset_perm.py:63
-#: tickets/serializers/ticket.py:29 xpack/plugins/cloud/models.py:211
-#: xpack/plugins/cloud/models.py:269
+#: tickets/serializers/ticket.py:29 xpack/plugins/cloud/models.py:220
+#: xpack/plugins/cloud/models.py:278
 msgid "Status"
 msgstr "状态"
 
@@ -1051,7 +1051,7 @@ msgid "Is success"
 msgstr "是否成功"
 
 #: audits/serializers.py:73 ops/models/command.py:24
-#: xpack/plugins/cloud/models.py:209
+#: xpack/plugins/cloud/models.py:218
 msgid "Result"
 msgstr "结果"
 
@@ -1199,7 +1199,7 @@ msgstr "登录复核 {}"
 msgid "SSO auth closed"
 msgstr "SSO 认证关闭了"
 
-#: authentication/errors.py:218 authentication/views/login.py:243
+#: authentication/errors.py:218 authentication/views/login.py:244
 msgid "Your password is too simple, please change it for security"
 msgstr "你的密码过于简单，为了安全，请修改"
 
@@ -1265,7 +1265,7 @@ msgid "Show"
 msgstr "显示"
 
 #: authentication/templates/authentication/_access_key_modal.html:66
-#: users/models/user.py:411 users/serializers/user.py:237
+#: users/models/user.py:421 users/serializers/user.py:226
 #: users/templates/users/user_profile.html:94
 #: users/templates/users/user_profile.html:163
 #: users/templates/users/user_profile.html:166
@@ -1274,7 +1274,7 @@ msgid "Disable"
 msgstr "禁用"
 
 #: authentication/templates/authentication/_access_key_modal.html:67
-#: users/models/user.py:412 users/serializers/user.py:238
+#: users/models/user.py:422 users/serializers/user.py:227
 #: users/templates/users/user_profile.html:92
 #: users/templates/users/user_profile.html:170
 msgid "Enable"
@@ -1382,11 +1382,11 @@ msgstr "复制成功"
 msgid "Welcome back, please enter username and password to login"
 msgstr "欢迎回来，请输入用户名和密码登录"
 
-#: authentication/views/login.py:84
+#: authentication/views/login.py:85
 msgid "Please enable cookies and try again."
 msgstr "设置你的浏览器支持cookie"
 
-#: authentication/views/login.py:189
+#: authentication/views/login.py:190
 msgid ""
 "Wait for <b>{}</b> confirm, You also can copy link to her/him <br/>\n"
 "                  Don't close this page"
@@ -1394,19 +1394,19 @@ msgstr ""
 "等待 <b>{}</b> 确认, 你也可以复制链接发给他/她 <br/>\n"
 "                  不要关闭本页面"
 
-#: authentication/views/login.py:194
+#: authentication/views/login.py:195
 msgid "No ticket found"
 msgstr "没有发现工单"
 
-#: authentication/views/login.py:226
+#: authentication/views/login.py:227
 msgid "Logout success"
 msgstr "退出登录成功"
 
-#: authentication/views/login.py:227
+#: authentication/views/login.py:228
 msgid "Logout success, return login page"
 msgstr "退出登录成功，返回到登录页面"
 
-#: authentication/views/login.py:242
+#: authentication/views/login.py:243
 msgid "Please change your password"
 msgstr "请修改密码"
 
@@ -1466,7 +1466,7 @@ msgstr ""
 msgid "Marshal data to text field"
 msgstr ""
 
-#: common/fields/model.py:157
+#: common/fields/model.py:165
 msgid "Encrypt field using Secret Key"
 msgstr ""
 
@@ -1503,11 +1503,11 @@ msgstr ""
 "<div>Luna是单独部署的一个程序，你需要部署luna，koko, </div><div>如果你看到了"
 "这个页面，证明你访问的不是nginx监听的端口，祝你好运</div>"
 
-#: jumpserver/views/other.py:76
+#: jumpserver/views/other.py:77
 msgid "Websocket server run on port: {}, you should proxy it on nginx"
 msgstr "Websocket 服务运行在端口: {}, 请检查nginx是否代理是否设置"
 
-#: jumpserver/views/other.py:90
+#: jumpserver/views/other.py:91
 msgid ""
 "<div>Koko is a separately deployed program, you need to deploy Koko, "
 "configure nginx for url distribution,</div> </div>If you see this page, "
@@ -1693,11 +1693,11 @@ msgstr "组织"
 msgid "Organization administrator"
 msgstr "组织管理员"
 
-#: orgs/models.py:17
+#: orgs/models.py:16
 msgid "Organization auditor"
 msgstr "组织审计员"
 
-#: orgs/models.py:386 users/forms/user.py:27 users/models/user.py:501
+#: orgs/models.py:386 users/forms/user.py:27 users/models/user.py:511
 #: users/templates/users/_select_user_modal.html:15
 #: users/templates/users/user_detail.html:73
 #: users/templates/users/user_list.html:16
@@ -1722,8 +1722,7 @@ msgstr "提示：RDP 协议不支持单独控制上传或下载文件"
 #: perms/forms/asset_permission.py:86 perms/forms/database_app_permission.py:41
 #: perms/forms/remote_app_permission.py:43 perms/models/base.py:50
 #: templates/_nav.html:21 users/forms/user.py:168 users/models/group.py:31
-#: users/models/user.py:497 users/serializers/user.py:48
-#: users/templates/users/_select_user_modal.html:16
+#: users/models/user.py:507 users/templates/users/_select_user_modal.html:16
 #: users/templates/users/user_asset_permission.html:39
 #: users/templates/users/user_asset_permission.html:67
 #: users/templates/users/user_database_app_permission.html:38
@@ -1789,7 +1788,7 @@ msgid "Asset permission"
 msgstr "资产授权"
 
 #: perms/models/base.py:53 tickets/serializers/request_asset_perm.py:31
-#: users/models/user.py:529 users/templates/users/user_detail.html:93
+#: users/models/user.py:539 users/templates/users/user_detail.html:93
 #: users/templates/users/user_profile.html:120
 msgid "Date expired"
 msgstr "失效日期"
@@ -2537,37 +2536,37 @@ msgstr "结束日期"
 msgid "Args"
 msgstr "参数"
 
-#: tickets/api/request_asset_perm.py:46
+#: tickets/api/request_asset_perm.py:48
 #, python-format
 msgid "Ticket has %s"
 msgstr "工单已%s"
 
-#: tickets/api/request_asset_perm.py:91
+#: tickets/api/request_asset_perm.py:93
 msgid "Confirm assets first"
 msgstr "请先确认资产"
 
-#: tickets/api/request_asset_perm.py:94
+#: tickets/api/request_asset_perm.py:96
 msgid "Confirmed assets changed"
 msgstr "确认的资产变更了"
 
-#: tickets/api/request_asset_perm.py:98
+#: tickets/api/request_asset_perm.py:100
 msgid "Confirm system-user first"
 msgstr "请先确认系统用户"
 
-#: tickets/api/request_asset_perm.py:102
+#: tickets/api/request_asset_perm.py:104
 msgid "Confirmed system-user changed"
 msgstr "确认的系统用户变更了"
 
-#: tickets/api/request_asset_perm.py:105 tickets/api/request_asset_perm.py:112
-#: xpack/plugins/cloud/models.py:202
+#: tickets/api/request_asset_perm.py:107 tickets/api/request_asset_perm.py:114
+#: xpack/plugins/cloud/models.py:211
 msgid "Succeed"
 msgstr "成功"
 
-#: tickets/api/request_asset_perm.py:120
+#: tickets/api/request_asset_perm.py:122
 msgid "From request ticket: {} {}"
 msgstr "来自工单申请: {} {}"
 
-#: tickets/api/request_asset_perm.py:122
+#: tickets/api/request_asset_perm.py:124
 msgid "{} request assets, approved by {}"
 msgstr "{} 申请资产，通过人 {}"
 
@@ -2686,11 +2685,11 @@ msgstr ""
 "        过期时间: {date_expired}<br>\n"
 "        "
 
-#: tickets/utils.py:20
+#: tickets/utils.py:21
 msgid "New ticket"
 msgstr "新工单"
 
-#: tickets/utils.py:28
+#: tickets/utils.py:25
 #, python-brace-format
 msgid ""
 "\n"
@@ -2715,11 +2714,11 @@ msgstr ""
 "        </div>\n"
 "    "
 
-#: tickets/utils.py:47
+#: tickets/utils.py:44
 msgid "Ticket has been reply"
 msgstr "工单已被回复"
 
-#: tickets/utils.py:48
+#: tickets/utils.py:45
 #, python-brace-format
 msgid ""
 "\n"
@@ -2750,7 +2749,7 @@ msgstr ""
 "        </div>\n"
 "     "
 
-#: users/api/user.py:158
+#: users/api/user.py:156
 msgid "Could not reset self otp, use profile reset instead"
 msgstr "不能在该页面重置多因子认证, 请去个人信息页面重置"
 
@@ -2796,7 +2795,7 @@ msgstr "确认密码"
 msgid "Password does not match"
 msgstr "密码不一致"
 
-#: users/forms/profile.py:89 users/models/user.py:493
+#: users/forms/profile.py:89 users/models/user.py:503
 #: users/templates/users/user_detail.html:57
 #: users/templates/users/user_profile.html:59
 msgid "Email"
@@ -2832,12 +2831,12 @@ msgid "Public key should not be the same as your old one."
 msgstr "不能和原来的密钥相同"
 
 #: users/forms/profile.py:137 users/forms/user.py:90
-#: users/serializers/user.py:200 users/serializers/user.py:282
-#: users/serializers/user.py:340
+#: users/serializers/user.py:189 users/serializers/user.py:271
+#: users/serializers/user.py:329
 msgid "Not a valid ssh public key"
 msgstr "SSH密钥不合法"
 
-#: users/forms/user.py:31 users/models/user.py:536
+#: users/forms/user.py:31 users/models/user.py:546
 #: users/templates/users/user_detail.html:89
 #: users/templates/users/user_list.html:18
 #: users/templates/users/user_profile.html:102
@@ -2875,7 +2874,7 @@ msgstr "密码策略"
 msgid "System administrator"
 msgstr "系统管理员"
 
-#: users/models/user.py:159
+#: users/models/user.py:158
 msgid "System auditor"
 msgstr "系统审计员"
 
@@ -2883,83 +2882,83 @@ msgstr "系统审计员"
 msgid "Application"
 msgstr "应用程序"
 
-#: users/models/user.py:413 users/templates/users/user_profile.html:90
+#: users/models/user.py:423 users/templates/users/user_profile.html:90
 msgid "Force enable"
 msgstr "强制启用"
 
-#: users/models/user.py:480
+#: users/models/user.py:490
 msgid "Local"
 msgstr "数据库"
 
-#: users/models/user.py:504
+#: users/models/user.py:514
 msgid "Avatar"
 msgstr "头像"
 
-#: users/models/user.py:507 users/templates/users/user_detail.html:68
+#: users/models/user.py:517 users/templates/users/user_detail.html:68
 msgid "Wechat"
 msgstr "微信"
 
-#: users/models/user.py:540
+#: users/models/user.py:550
 msgid "Date password last updated"
 msgstr "最后更新密码日期"
 
-#: users/models/user.py:653
+#: users/models/user.py:657
 msgid "Administrator"
 msgstr "管理员"
 
-#: users/models/user.py:656
+#: users/models/user.py:660
 msgid "Administrator is the super user of system"
 msgstr "Administrator是初始的超级管理员"
 
-#: users/serializers/user.py:53 users/serializers/user.py:88
+#: users/serializers/user.py:50 users/serializers/user.py:84
 msgid "Organization role name"
 msgstr "组织角色名称"
 
-#: users/serializers/user.py:55
-msgid "Total role name"
-msgstr "汇总角色名称"
-
-#: users/serializers/user.py:79 users/serializers/user.py:253
+#: users/serializers/user.py:75 users/serializers/user.py:242
 msgid "Is first login"
 msgstr "首次登录"
 
-#: users/serializers/user.py:80
+#: users/serializers/user.py:76
 msgid "Is valid"
 msgstr "账户是否有效"
 
-#: users/serializers/user.py:81
+#: users/serializers/user.py:77
 msgid "Is expired"
 msgstr " 是否过期"
 
-#: users/serializers/user.py:82
+#: users/serializers/user.py:78
 msgid "Avatar url"
 msgstr "头像路径"
 
-#: users/serializers/user.py:86
+#: users/serializers/user.py:82
 msgid "Groups name"
 msgstr "用户组名"
 
-#: users/serializers/user.py:87
+#: users/serializers/user.py:83
 msgid "Source name"
 msgstr "用户来源名"
 
-#: users/serializers/user.py:89
+#: users/serializers/user.py:85
 msgid "Super role name"
 msgstr "超级角色名称"
 
-#: users/serializers/user.py:120
+#: users/serializers/user.py:86
+msgid "Total role name"
+msgstr "汇总角色名称"
+
+#: users/serializers/user.py:109
 msgid "Role limit to {}"
 msgstr "角色只能为 {}"
 
-#: users/serializers/user.py:132 users/serializers/user.py:306
+#: users/serializers/user.py:121 users/serializers/user.py:295
 msgid "Password does not match security rules"
 msgstr "密码不满足安全规则"
 
-#: users/serializers/user.py:298
+#: users/serializers/user.py:287
 msgid "The old password is incorrect"
 msgstr "旧密码错误"
 
-#: users/serializers/user.py:312
+#: users/serializers/user.py:301
 msgid "The newly set password is inconsistent"
 msgstr "两次密码不一致"
 
@@ -2973,7 +2972,7 @@ msgstr "安全令牌验证"
 
 #: users/templates/users/_base_otp.html:14 users/templates/users/_user.html:13
 #: users/templates/users/user_profile_update.html:55
-#: xpack/plugins/cloud/models.py:119 xpack/plugins/cloud/serializers.py:82
+#: xpack/plugins/cloud/models.py:124 xpack/plugins/cloud/serializers.py:83
 msgid "Account"
 msgstr "账户"
 
@@ -3137,7 +3136,7 @@ msgstr "很强"
 #: users/templates/users/user_database_app_permission.html:41
 #: users/templates/users/user_list.html:19
 #: users/templates/users/user_remote_app_permission.html:41
-#: xpack/plugins/cloud/models.py:50
+#: xpack/plugins/cloud/models.py:51
 msgid "Validity"
 msgstr "有效"
 
@@ -3836,79 +3835,95 @@ msgstr "无法将数据发送到远程"
 msgid "Cloud center"
 msgstr "云管中心"
 
-#: xpack/plugins/cloud/models.py:29
+#: xpack/plugins/cloud/models.py:30
 msgid "Available"
 msgstr "有效"
 
-#: xpack/plugins/cloud/models.py:30
+#: xpack/plugins/cloud/models.py:31
 msgid "Unavailable"
 msgstr "无效"
 
-#: xpack/plugins/cloud/models.py:39
+#: xpack/plugins/cloud/models.py:40
 msgid "Provider"
 msgstr "云服务商"
 
-#: xpack/plugins/cloud/models.py:42
+#: xpack/plugins/cloud/models.py:43
 msgid "Access key id"
 msgstr ""
 
-#: xpack/plugins/cloud/models.py:46
+#: xpack/plugins/cloud/models.py:47
 msgid "Access key secret"
 msgstr ""
 
-#: xpack/plugins/cloud/models.py:64
+#: xpack/plugins/cloud/models.py:65
 msgid "Cloud account"
 msgstr "云账号"
 
-#: xpack/plugins/cloud/models.py:122 xpack/plugins/cloud/serializers.py:59
+#: xpack/plugins/cloud/models.py:120
+msgid "Instance name"
+msgstr "实例名称"
+
+#: xpack/plugins/cloud/models.py:121
+msgid "Instance name and Partial IP"
+msgstr "实例名称和部分IP"
+
+#: xpack/plugins/cloud/models.py:127 xpack/plugins/cloud/serializers.py:59
 msgid "Regions"
 msgstr "地域"
 
-#: xpack/plugins/cloud/models.py:125
+#: xpack/plugins/cloud/models.py:130
 msgid "Instances"
 msgstr "实例"
 
-#: xpack/plugins/cloud/models.py:137 xpack/plugins/cloud/serializers.py:86
+#: xpack/plugins/cloud/models.py:134
+msgid "Hostname strategy"
+msgstr "主机名策略"
+
+#: xpack/plugins/cloud/models.py:146 xpack/plugins/cloud/serializers.py:87
 msgid "Always update"
 msgstr "总是更新"
 
-#: xpack/plugins/cloud/models.py:143
+#: xpack/plugins/cloud/models.py:152
 msgid "Date last sync"
 msgstr "最后同步日期"
 
-#: xpack/plugins/cloud/models.py:154 xpack/plugins/cloud/models.py:207
+#: xpack/plugins/cloud/models.py:163 xpack/plugins/cloud/models.py:216
 msgid "Sync instance task"
 msgstr "同步实例任务"
 
-#: xpack/plugins/cloud/models.py:217 xpack/plugins/cloud/models.py:272
+#: xpack/plugins/cloud/models.py:226 xpack/plugins/cloud/models.py:281
 msgid "Date sync"
 msgstr "同步日期"
 
-#: xpack/plugins/cloud/models.py:245
+#: xpack/plugins/cloud/models.py:254
 msgid "Unsync"
 msgstr "未同步"
 
-#: xpack/plugins/cloud/models.py:246 xpack/plugins/cloud/models.py:247
+#: xpack/plugins/cloud/models.py:255
+msgid "New Sync"
+msgstr "新同步"
+
+#: xpack/plugins/cloud/models.py:256
 msgid "Synced"
 msgstr "已同步"
 
-#: xpack/plugins/cloud/models.py:248
+#: xpack/plugins/cloud/models.py:257
 msgid "Released"
 msgstr "已释放"
 
-#: xpack/plugins/cloud/models.py:253
+#: xpack/plugins/cloud/models.py:262
 msgid "Sync task"
 msgstr "同步任务"
 
-#: xpack/plugins/cloud/models.py:257
+#: xpack/plugins/cloud/models.py:266
 msgid "Sync instance task history"
 msgstr "同步实例任务历史"
 
-#: xpack/plugins/cloud/models.py:260
+#: xpack/plugins/cloud/models.py:269
 msgid "Instance"
 msgstr "实例"
 
-#: xpack/plugins/cloud/models.py:263
+#: xpack/plugins/cloud/models.py:272
 msgid "Region"
 msgstr "地域"
 
@@ -3992,7 +4007,7 @@ msgstr "执行次数"
 msgid "Instance count"
 msgstr "实例个数"
 
-#: xpack/plugins/cloud/serializers.py:85
+#: xpack/plugins/cloud/serializers.py:86
 #: xpack/plugins/gathered_user/serializers.py:20
 msgid "Periodic display"
 msgstr "定时执行"
@@ -4057,30 +4072,34 @@ msgstr "管理页面logo"
 msgid "Logo of logout page"
 msgstr "退出页面logo"
 
-#: xpack/plugins/license/api.py:46
+#: xpack/plugins/license/api.py:37
 msgid "License import successfully"
 msgstr "许可证导入成功"
 
-#: xpack/plugins/license/api.py:47
+#: xpack/plugins/license/api.py:38
 msgid "License is invalid"
 msgstr "无效的许可证"
 
-#: xpack/plugins/license/meta.py:11 xpack/plugins/license/models.py:94
+#: xpack/plugins/license/meta.py:11 xpack/plugins/license/models.py:124
 msgid "License"
 msgstr "许可证"
 
-#: xpack/plugins/license/models.py:74
+#: xpack/plugins/license/models.py:71
 msgid "Standard edition"
 msgstr "标准版"
 
-#: xpack/plugins/license/models.py:76
+#: xpack/plugins/license/models.py:73
 msgid "Enterprise edition"
 msgstr "企业版"
 
-#: xpack/plugins/license/models.py:78
+#: xpack/plugins/license/models.py:75
 msgid "Ultimate edition"
 msgstr "旗舰版"
 
+#: xpack/plugins/license/models.py:77
+msgid "Community edition"
+msgstr "社区版"
+
 #~ msgid "Organization User"
 #~ msgstr "组织用户"
 
diff --git a/apps/settings/api.py b/apps/settings/api.py
index 786c43bad..2c7c31d13 100644
--- a/apps/settings/api.py
+++ b/apps/settings/api.py
@@ -2,6 +2,7 @@
 #
 
 import json
+import threading
 from collections.abc import Iterable
 from smtplib import SMTPSenderRefused
 from rest_framework import generics
@@ -15,7 +16,7 @@ from .utils import (
     LDAPServerUtil, LDAPCacheUtil, LDAPImportUtil, LDAPSyncUtil,
     LDAP_USE_CACHE_FLAGS, LDAPTestUtil, ObjectDict
 )
-from .tasks import sync_ldap_user_task
+from .tasks import sync_ldap_user
 from common.permissions import IsOrgAdmin, IsSuperUser
 from common.utils import get_logger
 from .serializers import (
@@ -204,8 +205,9 @@ class LDAPUserListApi(generics.ListAPIView):
         if sync_util.task_no_start:
             # 任务外部设置 task running 状态
             sync_util.set_task_status(sync_util.TASK_STATUS_IS_RUNNING)
-            task = sync_ldap_user_task.delay()
-            data = {'msg': 'Cache no data, sync task {} started.'.format(task.id)}
+            t = threading.Thread(target=sync_ldap_user)
+            t.start()
+            data = {'msg': 'Sync start.'}
             return Response(data=data, status=409)
         # 同步任务正在执行
         if sync_util.task_is_running:
@@ -214,7 +216,7 @@ class LDAPUserListApi(generics.ListAPIView):
         # 同步任务执行结束
         if sync_util.task_is_over:
             msg = sync_util.get_task_error_msg()
-            data = {'error': 'Synchronization task report error: {}'.format(msg)}
+            data = {'error': 'Synchronization error: {}'.format(msg)}
             return Response(data=data, status=400)
 
         return super().list(request, *args, **kwargs)
diff --git a/apps/settings/tasks/ldap.py b/apps/settings/tasks/ldap.py
index 60058e03e..6869d0254 100644
--- a/apps/settings/tasks/ldap.py
+++ b/apps/settings/tasks/ldap.py
@@ -1,17 +1,14 @@
 # coding: utf-8
 # 
 
-from celery import shared_task
-
 from common.utils import get_logger
 from ..utils import LDAPSyncUtil
 
-__all__ = ['sync_ldap_user_task']
+__all__ = ['sync_ldap_user']
 
 
 logger = get_logger(__file__)
 
 
-@shared_task
-def sync_ldap_user_task():
+def sync_ldap_user():
     LDAPSyncUtil().perform_sync()
diff --git a/apps/tickets/migrations/0004_ticket_comment.py b/apps/tickets/migrations/0004_ticket_comment.py
new file mode 100644
index 000000000..c30776eb9
--- /dev/null
+++ b/apps/tickets/migrations/0004_ticket_comment.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.13 on 2020-09-07 11:10
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tickets', '0003_auto_20200804_1551'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='ticket',
+            name='comment',
+            field=models.TextField(blank=True, default='', max_length=128, verbose_name='Comment'),
+        ),
+    ]
diff --git a/apps/tickets/models/ticket.py b/apps/tickets/models/ticket.py
index 3e979f244..f52172fb3 100644
--- a/apps/tickets/models/ticket.py
+++ b/apps/tickets/models/ticket.py
@@ -40,6 +40,7 @@ class Ticket(OrgModelMixin, CommonModelMixin):
     type = models.CharField(max_length=16, choices=TYPE.choices, default=TYPE.GENERAL, verbose_name=_("Type"))
     status = models.CharField(choices=STATUS.choices, max_length=16, default='open')
     action = models.CharField(choices=ACTION.choices, max_length=16, default='', blank=True)
+    comment = models.TextField(max_length=128, default='', blank=True, verbose_name=_('Comment'))
 
     origin_objects = models.Manager()
 
diff --git a/apps/tickets/serializers/request_asset_perm.py b/apps/tickets/serializers/request_asset_perm.py
index 8827f482c..5c7e08cfd 100644
--- a/apps/tickets/serializers/request_asset_perm.py
+++ b/apps/tickets/serializers/request_asset_perm.py
@@ -46,7 +46,7 @@ class RequestAssetPermTicketSerializer(serializers.ModelSerializer):
             'status', 'action', 'date_created', 'date_updated', 'system_user_waitlist_url',
             'type', 'type_display', 'action_display', 'ips', 'confirmed_assets',
             'date_start', 'date_expired', 'confirmed_system_user', 'hostname',
-            'assets_waitlist_url', 'system_user', 'org_id', 'actions'
+            'assets_waitlist_url', 'system_user', 'org_id', 'actions', 'comment'
         ]
         m2m_fields = [
             'user', 'user_display', 'assignees', 'assignees_display',
diff --git a/apps/users/api/user.py b/apps/users/api/user.py
index ae4550931..148378522 100644
--- a/apps/users/api/user.py
+++ b/apps/users/api/user.py
@@ -44,9 +44,7 @@ class UserViewSet(CommonApiMixin, UserQuerysetMixin, BulkModelViewSet):
     def get_queryset(self):
         return super().get_queryset().annotate(
             gc_m2m_org_members__role=GroupConcat('m2m_org_members__role'),
-            gc_groups__name=GroupConcat('groups__name'),
-            gc_groups=GroupConcat('groups__id', output_field=CharField())
-        )
+        ).prefetch_related('groups')
 
     def send_created_signal(self, users):
         if not isinstance(users, list):
diff --git a/apps/users/models/user.py b/apps/users/models/user.py
index f65b9398e..f0f2ec896 100644
--- a/apps/users/models/user.py
+++ b/apps/users/models/user.py
@@ -560,12 +560,6 @@ class User(AuthMixin, TokenMixin, RoleMixin, MFAMixin, AbstractUser):
 
     @property
     def groups_display(self):
-        if hasattr(self, 'gc_groups__name'):
-            names = self.gc_groups__name
-            if isinstance(names, str):
-                return ' '.join(set(self.gc_groups__name.split(',')))
-            else:
-                return ''
         return ' '.join([group.name for group in self.groups.all()])
 
     @property
diff --git a/apps/users/serializers/user.py b/apps/users/serializers/user.py
index d6968a2d8..ccb269350 100644
--- a/apps/users/serializers/user.py
+++ b/apps/users/serializers/user.py
@@ -44,9 +44,6 @@ class UserSerializer(CommonBulkSerializerMixin, serializers.ModelSerializer):
         label=_('Password strategy'), write_only=True
     )
     mfa_level_display = serializers.ReadOnlyField(source='get_mfa_level_display')
-    groups = GroupConcatedPrimaryKeyRelatedField(
-        label=_('User group'), many=True, queryset=UserGroup.objects.all(), required=False
-    )
     login_blocked = serializers.SerializerMethodField()
     can_update = serializers.SerializerMethodField()
     can_delete = serializers.SerializerMethodField()
diff --git a/config_example.yml b/config_example.yml
index fd8710c78..f23b5c7e5 100644
--- a/config_example.yml
+++ b/config_example.yml
@@ -116,7 +116,10 @@ REDIS_PORT: 6379
 
 # Perm show single asset to ungrouped node
 # 是否把未授权节点资产放入到 未分组 节点中
-# PERM_SINGLE_ASSET_TO_UNGROUP_NODE: false
+# PERM_SINGLE_ASSET_TO_UNGROUP_NODE: False
+#
+# 同一账号仅允许在一台设备登录
+# USER_LOGIN_SINGLE_MACHINE_ENABLED: False
 #
 # 启用定时任务
 # PERIOD_TASK_ENABLE: True