WorkingTipsOnPlayWithDocker

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Environment

Qemu Image

Qemu image preparation:

# mkdir offline-play-with-docker
# cd offline-play-with-docker 
# qemu-img create -f qcow2 offline-play-with-docker.qcow2 200G
Formatting 'offline-play-with-docker.qcow2', fmt=qcow2 size=214748364800 cluster_size=65536 lazy_refcounts=off refcount_bits=16

Virt-manager Networking

Network Name:

Definition of IPV4:

Warning:

Isolation(Could be adjust to isolated):

Create vm and specify vmworks:

Install CentOS 7.4, partition like following:

System

Set the hostname via:

Install mate desktop(for debugging purpose):

# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
# yum --enablerepo=epel -y groups install "MATE Desktop"

Install some tools:

# yum install -y vim wget python-pip gcc git nethogs
# pip install shadowsocks
# pip inststall --upgrade pip
# yum install -y libevent-devel
# build the redsocks for crossing the gfw!!!

Now you could cross the firewall for installing the go or other staffs(crossing the gfw WILL let everything more smoothly).

Install docker-ce:

#  yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2
# yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
# yum install -y docker-ce

Install docker-compose via pip:

# pip install docker-compose

Start and enable docker:

# systemctl enable docker
# systemctl start docker
# docker swarm init

You have to run docker swarm init, or you won’t login into the play-with-docker.

Install golang:

# yum install -y golang
# mkdir ~/go
# vim ~/.bashrc
export GOPATH=/root/go
export PATH=$PATH:$GOPATH/bin

Create the directory and clone the source code:

# mkdir ~/Code
# cd Code
# git clone https://github.com/play-with-docker/play-with-docker.git

Build the play-with-go:

# go get -u github.com/golang/dep/cmd/dep
# which dep
/root/go/bin/dep
# cd ~/Code/play-with-docker/
# go get -v -d -t ./...
# cd /root/go/src/github.com/play-with-docker/play-with-docker
# dep ensure

Fixed IP

Fixed IP address then we could manually build the dind adjusting to this IP address:

Local Registry

In order to work offline, we have to use local repository.

# mkdir ~/data
# cd ~/data
# docker run -it --rm --entrypoint cat registry:2 /etc/docker/registry/config.yml > config.yml
# vim config.yml
proxy:
      remoteurl: https://registry-1.docker.io
# mkdir ~/data/data
# docker run -d --restart=always -p 5000:5000 --name docker-registry-proxy-2 -v /root/data/config.yml:/etc/docker/registry/config.yml -v /root/data/data:/var/lib/registry registry:2

Now examine the docker registry running:

# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
0ea38c808e8d        registry:2          "/entrypoint.sh /etc…"   2 seconds ago       Up 1 second         0.0.0.0:5000->5000/tcp   docker-registry-proxy-2

Build dind

dind is docker in docker, which is a docker image for running docker instance inside docker, we build it manually:

# vim
/root/go/src/github.com/play-with-docker/play-with-docker/dockerfiles/dind/daemon.json
    "insecure-registries": ["https://192.192.189.114:5000"],
# vim
/root/go/src/github.com/play-with-docker/play-with-docker/dockerfiles/dind/Dockerfile
......
    /usr/sbin/sshd -o PermitRootLogin=yes -o PrintMotd=no 2>/dev/null && \
    dockerd --registry-mirror=http://192.192.189.114:5000 &>/docker.log 
......

Build the image:

# docker build -t franela/dind:latest .
# docker images | grep dind
franela/dind        latest              7832d23a42c7        About a minute ago   439MB
docker              stable-dind         d303f49c92a7        2 weeks ago          147MB

This dind image could use local registry, so we only need to sync once, then we could let it running really offlinely.

Local play-with-docker

Change the source code:

# cd /root/go/src/github.com/play-with-docker/play-with-docker
# vim handlers/bootstrap.go +64
- return false
+ return true
# vim config/config.go
 flag.StringVar(&PlaygroundDomain, "playground-domain", "192.192.189.114", "Domain to use for the playground")

Make sure your dnsmasq is running, then edit the /etc/dnsmasq.conf via:

.................
# Add local-only domains here, queries in these domains are answered
# from /etc/hosts or DHCP only.
#local=/localnet/
address=/192.192.189.114/192.192.189.114
address=/localhost/127.0.0.1
.................

Run play-with-docker:

# cd /root/go/src/github.com/play-with-docker/play-with-docker
# docker-compose up

Then use a browser to access this website:

Examine the registry now:

Then in host terminal, examine the downloaded registry cache:

curl http://192.192.189.114:5000/v2/_catalog
{"repositories":["library/alpine","library/ubuntu"]}

play-with-docker classroom

Clone the repository:

# cd ~/Code
# git clone https://github.com/play-with-docker/play-with-docker.github.io.git
# cd play-with-docker.github.io/
# vim _config.yml
pwdurl: http://192.192.189.114

# mkdir _site
# groupadd jekyll
# useradd jekyll -m -g jekyll
# chown jekyll:jekyll -R .
# docker-compose up

Now open the browser and see the result:

tips for docker-nginx

# docker run --name docker-nginx -p 8333:80 -d -v /root/gcr:/usr/share/nginx/html jrelva/nginx-autoindex
root@playwithdocker:/etc/systemd/system# cat mynginx.service 
[Unit]
Description=mynginx
Requires=docker.service
After=docker.service

[Service]
Restart=always
ExecStart=/usr/bin/docker start -a docker-nginx
ExecStop=/usr/bin/docker stop -t 2 docker-nginx

[Install]
WantedBy=multi-user.target