1、背景

在win10中安装wsl2体验linux操作系统，按照docker官网步骤安装，安装完毕后面提示

$ docker ps
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

$ docker info
Client: Docker Engine - CommunityVersion:    26.0.1Context:    defaultDebug Mode: falsePlugins:buildx: Docker Buildx (Docker Inc.)Version:  v0.13.1Path:     /usr/libexec/docker/cli-plugins/docker-buildxcompose: Docker Compose (Docker Inc.)Version:  v2.26.1Path:     /usr/libexec/docker/cli-plugins/docker-composeServer:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
errors pretty printing info

2、目标

启动运行docker

3、环境

项目	版本
windows10	22H2
wsl	2
ubuntu	22.04
docker	226.0.1

4、原因

通过系统工具update-alternatives 可以配置和切换当前系统中的iptables 环境做到多版本管理。
切换iptables版本解决WSL2中docker运行异常的问题。

4、操作

5.1、查看配置

查看当前配置信息

 sudo update-alternatives --config iptables
There are 2 choices for the alternative iptables (providing /usr/sbin/iptables).Selection    Path                       Priority   Status
------------------------------------------------------------
* 0            /usr/sbin/iptables-nft      20        auto mode1            /usr/sbin/iptables-legacy   10        manual mode2            /usr/sbin/iptables-nft      20        manual modePress <enter> to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/sbin/iptables-legacy to provide /usr/sbin/iptables (iptables) in manual mode

5.2、 切换配置

输入1 从iptables-nft路径切换至iptables-legacy

5.3、启动docker

$ sudo service docker start

5.4、验证docker

$ docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES