> For the complete documentation index, see [llms.txt](https://hezhiqiang.gitbook.io/docker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hezhiqiang.gitbook.io/docker/advanced_network/bridge.md).

# 自定义网桥

除了默认的 `docker0` 网桥，用户也可以指定网桥来连接各个容器。

在启动 Docker 服务的时候，使用 `-b BRIDGE`或`--bridge=BRIDGE` 来指定使用的网桥。

如果服务已经运行，那需要先停止服务，并删除旧的网桥。

```bash
$ sudo systemctl stop docker
$ sudo ip link set dev docker0 down
$ sudo brctl delbr docker0
```

然后创建一个网桥 `bridge0`。

```bash
$ sudo brctl addbr bridge0
$ sudo ip addr add 192.168.5.1/24 dev bridge0
$ sudo ip link set dev bridge0 up
```

查看确认网桥创建并启动。

```bash
$ ip addr show bridge0
4: bridge0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state UP group default
    link/ether 66:38:d0:0d:76:18 brd ff:ff:ff:ff:ff:ff
    inet 192.168.5.1/24 scope global bridge0
       valid_lft forever preferred_lft forever
```

在 Docker 配置文件 `/etc/docker/daemon.json` 中添加如下内容，即可将 Docker 默认桥接到创建的网桥上。

```javascript
{
  "bridge": "bridge0",
}
```

启动 Docker 服务。

新建一个容器，可以看到它已经桥接到了 `bridge0` 上。

可以继续用 `brctl show` 命令查看桥接的信息。另外，在容器中可以使用 `ip addr` 和 `ip route` 命令来查看 IP 地址配置和路由信息。


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