Task 0: Install a ubuntu 16.04 server 64-bit

Procedure：

1. Download https://download.virtualbox.org/virtualbox/6.1.14/VirtualBox-6.1.14-140239-Win.exe
2. Download http://releases.ubuntu.com/16.04/ubuntu-16.04.7-server-amd64.iso
3. Install VirtualBox
4. Click on“新建”
5. Choose 4096MB memory， and below default settings， and set disk to 40GB.
6. Back to Main screen and click on “设置”， select “系统”，Move “硬盘” to Top.
7. Click “设置” again and choose “存储”， choose the downloaded Ubuntu image.
8. Back to Main screen and select “启动”
9. Follow the process and set the user password, Language, Timezone, etc
10. Install Openssh

Port Forward：

1. Click on “管理“-”全局设定”-“网络
2. Select “端口转发 and add the rules. 192.168.0.108 is HOST ip.
3. Set for the VM, “设置-“网络，choose the created NAT network
4. 启动VM，check the ip of the VM
5. Set the ip to 192.168.2.4 in Step2 for port forward. And restart VM.

Task 1: Update system

Make sure openssl-server is installed. apt-get install openssh-server

Update Kernel Run Below command in VM：

1. Apt update
2. Apt upgrade

Check the kernel version: root@celia-ubuntu:/gitnodes/go-web-hello-world# cat /proc/version Linux version 4.4.0-186-generic (buildd@lcy01-amd64-002) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu116.04.12) ) #216-Ubuntu SMP Wed Jul 1 05:34:05 UTC 2020

Task 2: install gitlab-ce version in the host

1. apt-get install -y curl openssh-server ca-certificates tzdata
2. apt-get install -y postfix
3. curl -sS https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.deb.sh | sudo bash
4. wget https://mirror.tuna.tsinghua.edu.cn/gitlab-ce/ubuntu/pool/xenial/main/g/gitlab-ce/gitlab-ce_13.3.6-ce.0_amd64.deb
5. dpkg -i gitlab-ce_13.3.6-ce.0_amd64.deb
6. vim /etc/gitlab/gitlab.rb

修改为自己的ip地址或者自己的域名，域名需要做地址解析

external_url 'http://127.0.0.1' 7. Init configuration: root@celia-ubuntu:~# gitlab-ctl reconfigure 8. Access http://127.0.0.1:8080 from HOST web browser. 9. Set password to “1qazXSW@” and login.

Task 3: create a demo group/project in gitlab

named demo/go-web-hello-world (demo is group name, go-web-hello-world is project name).

Use golang to build a hello world web app (listen to 8081 port) and check-in the code to mainline.

https://golang.org/
https://gowebexamples.com/hello-world/

Expect source code at http://127.0.0.1:8080/demo/go-web-hello-world

1. Create a group named demo.
2. Select “New project” to create a new project named “go-web-hello-world”
3. Create and put hello.go root@celia-ubuntu:~/gitnodes/go-web-hello-world# cat hello.go package main

import ( "fmt" "net/http" ) func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Go Web Hello world!\n") })

http.ListenAndServe(":8081", nil)

} 4. Expect source code at http://127.0.0.1:8080/demo/go-web-hello-world

Task 4: build the app and expose ($ go run) the service to 8081 port

Expect output:

curl http://127.0.0.1:8081
Go Web Hello World!

1. Modify code: root@celia-ubuntu:~/gitnodes/go-web-hello-world# cat hello.go package main

import ( "fmt" "net/http" )

func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Go Web Hello world!\n") })

http.ListenAndServe(":8081", nil)

}

2. Wget https://studygolang.com/dl/golang/go1.15.2.linux-amd64.tar.gz
3. tar -xzf go1.8.linux-amd64.tar.gz -C /usr/local
4. 配置环境变量 vim ~/.bashrc Add below at last line export GOPATH= /opt/go export GOROOT=/usr/local/go export GOARCH=386 export GOOS=linux export GOBIN=$GOROOT/bin/ export GOTOOLS=$GOROOT/pkg/tool/ export PATH=$PATH:$GOBIN:$GOTOOLS

source ~/.bashrc

5. go run hello.go
6. curl in another terminal root@celia-ubuntu:~# curl http://127.0.0.1:8081 Go Web Hello world!

Browse in HOST browser.

Task 5: install docker

https://docs.docker.com/install/linux/docker-ce/ubuntu/

用国内的源 Follow guide Ubuntu 18.04 安装 Docker-ce https://www.runoob.com/docker/ubuntu-docker-install.html

1. cp /etc/apt/sources.list /etc/apt/sources.list.back sed -i 's/archive.ubuntu.com/mirrors.ustc.edu.cn/g' /etc/apt/sources.list apt update apt update 2 apt install docker-ce
2. systemctl enable docker
3. systemctl start docker

Task 6: run the app in container

build a docker image ($ docker build) for the web app and run that in a container ($ docker run), expose the service to 8082 (-p)

https://docs.docker.com/engine/reference/commandline/build/

Check in the Dockerfile into gitlab

Expect output:

curl http://127.0.0.1:8082
Go Web Hello World!

1. 配置加速器 Vim /etc/docker/daemon.json root@celia-ubuntu:~/gitnodes/go-web-hello-world# cat /etc/docker/daemon.json { "registry-mirrors": ["https://c6j7pq1p.mirror.aliyuncs.com"] } Systemctl daemon-reload Systemctl restart docker

2. Pull a base image with golang.
   docker pull golang root@celia-ubuntu:~/gitnodes/go-web-hello-world# docker images REPOSITORY TAG IMAGE ID CREATED SIZE golang latest 05c8f6d2538a 9 days ago 839MB

3. Create dockerfile root@celia-ubuntu:~/gitnodes/go-web-hello-world# cat dockerfile FROM golang COPY hello.go /root/ CMD ["/usr/local/go/bin/go", "run", "/root/hello.go"]

4. Build image root@celia-ubuntu:~/gitnodes/go-web-hello-world# docker build -t helloworld:1.0 . Sending build context to Docker daemon 53.76kB Step 1/3 : FROM golang ---> 05c8f6d2538a Step 2/3 : COPY hello.go /root/ ---> Using cache ---> b74baeabf410 Step 3/3 : CMD ["/usr/local/go/bin/go", "run", "/root/hello.go"] ---> Running in a1e451a1033d Removing intermediate container a1e451a1033d ---> 06ea8a4c0304 Successfully built 06ea8a4c0304 Successfully tagged helloworld:1.0

5. Run image root@celia-ubuntu:~/gitnodes/go-web-hello-world# docker run -it -p 8083:8081 helloworld:1.0

6. Open another terminal： root@celia-ubuntu:~# curl http://127.0.0.1:8083 Go Web Hello world!

Task 7: push image to dockerhub

tag the docker image using your_dockerhub_id/go-web-hello-world:v0.1 and push it to docker hub (https://hub.docker.com/)

Expect output: https://hub.docker.com/repository/docker/your_dockerhub_id/go-web-hello-world

Docker Hub account: celiaw/gifthh1986117

1． Dockroot@celia-ubuntu:~/gitnodes/go-web-hello-world# docker login Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one. Username: celiaw Password: WARNING! Your password will be stored unencrypted in /root/.docker/config.json. Configure a credential helper to remove this warning. See https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded root@celia-ubuntu:/gitnodes/go-web-hello-world# root@celia-ubuntu:/gitnodes/go-web-hello-world# root@celia-ubuntu:~/gitnodes/go-web-hello-world# docker images REPOSITORY TAG IMAGE ID CREATED SIZE helloworld 1.0 06ea8a4c0304 19 minutes ago 839MB golang latest 05c8f6d2538a 9 days ago 839MB

2. Docker tag root@celia-ubuntu:/gitnodes/go-web-hello-world# docker tag helloworld:1.0 celiaw/helloworld:1.0 root@celia-ubuntu:/gitnodes/go-web-hello-world# docker images REPOSITORY TAG IMAGE ID CREATED SIZE celiaw/helloworld 1.0 06ea8a4c0304 20 minutes ago 839MB helloworld 1.0 06ea8a4c0304 20 minutes ago 839MB golang latest 05c8f6d2538a 9 days ago 839MB

3. Docker push root@celia-ubuntu:~/gitnodes/go-web-hello-world# docker push celiaw/helloworld:1.0 The push refers to repository [docker.io/celiaw/helloworld] 6fa24063cb66: Pushed 1ba6a3ca6c41: Mounted from library/golang d2588c27d938: Mounted from library/golang 6b6e43b44148: Mounted from library/golang 17bdf5e22660: Mounted from library/golang d37096232ed8: Pushing [==================================================>] 17.85MB 6add0d2b5482: Mounted from library/golang 4ef54afed780: Waiting

4. Browse https://hub.docker.com/repository/docker/celiaw/helloworld