Docker in Docker 实践 on mac

在尝试tekton构建ci pipeline是，需要在k8 pod里build image，于是研究了如何docker in docker。

1. 编写自己的dind docker image

   FROM docker:20.10.16-dind
   ENV DOCKER_HOST unix:///var/run/docker.sock

2. docker build 自己的dind docker image并push到repo上

   docker build . -t cara/my-dind-docker:latest
   docker push cara/my-dind-docker:latest

3. 启动container，并挂载本地的docker socket到该container

   docker run -v /var/run/docker.sock:/var/run/docker.sock -ti cara/my-dind-docker:latest /bin/sh

4. 在container内部，使用docker指令就可以了

   carawang@docker_base %docker run -v /var/run/docker.sock:/var/run/docker.sock -ti cara/my-dind-docker:latest sh
   / #
   / # ls
   bin dev home lib64 mnt proc run srv tmp var
   certs etc lib media opt root sbin sys usr
   / # docker ps
   CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
   21cfcc3e6a32 cara/my-dind-docker:latest "dockerd-entrypoint...." 6 seconds ago Up 5 seconds 2375-2376/tcp thirsty_cray
   da2c32df0751 cara/my-dind-docker:latest "dockerd-entrypoint...." 28 minutes ago Up 28 minutes 0.0.0.0:80->80/tcp, 2375-2376/tcp my-dind-container
   e0763051d1c4 gcr.io/k8s-minikube/kicbase:v0.0.44 "/usr/local/bin/entr..." 10 days ago Up 37 minutes 127.0.0.1:49709->22/tcp, 127.0.0.1:49710->2376/tcp, 127.0.0.1:49712->5000/tcp, 127.0.0.1:49713->8443/tcp, 127.0.0.1:49711->32443/tcp minikube
   / #