ovsdb-tool：'create' command takes at most 2 arguments

ovsdb-tool是Open vSwitch数据库工具，它用于与Open vSwitch的SQLite或PostgreSQL存储引擎交互，执行诸如创建、更新或删除表格、列等操作。当你使用`create`命令时，这个命令一般用于初始化或创建新的数据库对象。其基本语法是：

ovsdb-tool create <table-name> <column-definition> [options]

其中：
- `<table-name>`：你想要创建的表的名称，例如`Bridge`、`Port`等。
- `<column-definition>`：定义新列的数据结构，包括列名和列的数据类型，如`name=String` 或 `external_ids=dict`。

`create`命令最多接受两个参数，第一个参数是必填的表名，第二个参数是可选的列定义，如果你只需要创建表而不指定列，可以略过此参数。

示例：

ovsdb-tool create Bridge {name="mybridge", fail_mode="secure"}

这将在OVS数据库中创建一个名为`mybridge`的新桥。

注意：`ovsdb-tool create`的具体选项可能取决于OVS版本和数据库后端的选择。在使用前最好查阅官方文档或在线帮助信息。

相关问题

ovsdb-tool: i/o error: /var/vos/etc/conf.db: failed to lock lockfile (no suc

h file or directory)

This error message indicates that the ovsdb-tool was unable to lock the lockfile for the conf.db file located in /var/vos/etc/. This could be due to several reasons, such as permission issues or a missing file or directory.

To resolve this error, you can try the following steps:

1. Check if the file or directory exists: Make sure that the conf.db file and the /var/vos/etc/ directory exist in the system.

2. Check file permissions: Ensure that the user running the ovsdb-tool has sufficient permissions to read and write to the conf.db file and the /var/vos/etc/ directory. You can use the chmod command to change the file permissions if necessary.

3. Check if the lockfile exists: The ovsdb-tool creates a lockfile when it accesses the conf.db file. Check if the lockfile exists in the same directory as the conf.db file. If it does, remove it and try running the ovsdb-tool again.

4. Restart the system: If none of the above steps work, try rebooting the system and then running the ovsdb-tool again.

If the error persists, you may need to contact your system administrator or seek further assistance.

systemctl status ovsdb-server

这是一个针对 Open vSwitch 数据库服务器（ovsdb-server）的 Systemd 服务状态命令。它将显示当前 ovsdb-server 服务的状态信息，例如是否正在运行、最近的日志信息等等。如果该服务正在运行，您将看到类似以下内容的输出：

● ovsdb-server.service - Open vSwitch Database Unit
   Loaded: loaded (/lib/systemd/system/ovsdb-server.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2021-08-19 09:00:00 UTC; 2h ago
 Main PID: 1234 (ovsdb-server)
    Tasks: 1 (limit: 4915)
   Memory: 15.8M
   CGroup: /system.slice/ovsdb-server.service
           └─1234 /usr/sbin/ovsdb-server --remote=punix:/var/run/openvswitch/db.sock --remote=db:Open_vSwitch,Open_vSwitch,manager_options --private-key=db:Open_vSwitch,SSL,private_key --certificate=db:Open_vSwitch,SSL,certificate --bootstrap-ca-cert=db:Open_vSwitch,SSL,ca_cert --pidfile --detach

如果该服务未运行，则会显示提示该服务未运行的消息。