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
/ #