A.搭建Docker服务。
- 安装Docker的依赖库。
yum install -y yum-utils device-mapper-persistent-data lvm2
- 添加Docker CE的软件源信息。
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
- 安装Docker CE。
yum makecache fast &&
yum -y install docker-ce
- 启动Docker服务。
systemctl start docker
- 配置DockerHub镜像加速器。
tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://registry.docker-cn.com"]
}
EOF
- 重启Docker服务。
systemctl restart docker
B.准备应用代码和Dockerfile
在工作空间下创建一个基于Golang的HelloWorld代码文件和一个用来构建运行Hello代码所需环境镜像的Dockerfile文件。
- 创建工作空间。
mkdir -p /tmp/demo && cd /tmp/demo
- 在工作空间下创建HelloWorld代码文件,用来在容器环境中监听HTTP服务,输出HelloWorld字符串。
cat > /tmp/demo/main.go << EOF
package main
import (
"fmt"
"net/http"
)
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello! World\n")
})
fmt.Println("start to serve...")
http.ListenAndServe(":80", nil)
}
EOF
- 在工作空间下创建Dockerfile文件。
cat > /tmp/demo/Dockerfile << EOF
FROM golang:1.12-alpine
change current working dir
WORKDIR /go/src/app
copy main.go into /go/src/app
COPY . .
go build and install the app
RUN go install -v ./...
run the app by default
CMD ["app"]
EOF
C. 本地构建镜像并运行镜像
- 使用docker build命令构建镜像。
docker build . -t demo:v1
Sending build context to Docker daemon 3.072kB
Step 1/5 : FROM golang:1.12-alpine
1.12-alpine: Pulling from library/golang
c9b1b535fdd9: Pull complete
cbb0d8da1b30: Pull complete
d909eff28200: Pull complete
665fbbf998e4: Pull complete
4985b1919860: Pull complete
Digest: sha256:3f8e3ad3e7c128d29ac3004ac8314967c5ddbfa5bfa7caa59b0de493fc01686a
Status: Downloaded newer image for golang:1.12-alpine
---> 76bddfb5e55e
Step 2/5 : WORKDIR /go/src/app
---> Running in 267b6eaa6339
Removing intermediate container 267b6eaa6339
---> b945a18744ab
Step 3/5 : COPY . .
---> 38bf768aed84
Step 4/5 : RUN go install -v ./...
---> Running in ca02c0e66ee8
app
Removing intermediate container ca02c0e66ee8
---> 6105ed5cc6f7
Step 5/5 : CMD ["app"]
---> Running in 5bc835f7b9de
Removing intermediate container 5bc835f7b9de
---> dfeafa2824e6
Successfully built dfeafa2824e6
Successfully tagged demo:v1
- 使用docker run命令运行镜像。
docker run -d -p 8000:80 demo:v1
[root@iZuf670yt5j8prmz4bkmpgZ demo]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e897cc02550c demo:v1 "app" 11 seconds ago Up 11 seconds 0.0.0.0:8000->80/tcp brave_wescoff
- 使用curl工具访问容器中的HelloWorld服务。
curl localhost:8000
D. 推送镜像
- 登录到阿里云Docker Registry。
[root@iZuf670yt5j8prmz4bkmpgZ ~]# docker login --username="XXX@XXX.com" registry.cn-shanghai.aliyuncs.com
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
- 标记本地镜像,将其归入远程仓库。
[root@iZuf670yt5j8prmz4bkmpgZ ~]# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
demo v1 dfeafa2824e6 13 minutes ago 354MB
golang 1.12-alpine 76bddfb5e55e 2 years ago 346MB
docker tag 76bddfb5e55e registry.cn-shanghai.aliyuncs.com/space_test001/demo:v1
[root@iZuf670yt5j8prmz4bkmpgZ ~]# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
demo v1 dfeafa2824e6 14 minutes ago 354MB
golang 1.12-alpine 76bddfb5e55e 2 years ago 346MB
registry.cn-shanghai.aliyuncs.com/space_test001/demo v1 76bddfb5e55e 2 years ago 346MB
- 将本地镜像推送到远程仓库。
docker push registry.cn-shanghai.aliyuncs.com/space_test001/demo:v1
The push refers to repository [registry.cn-shanghai.aliyuncs.com/space_test001/demo]
7306dca01e79: Pushed
3957f7032fc4: Pushed
12c4e92b2d48: Pushed
45182158f5da: Pushed
5216338b40a7: Pushed
v1: digest: sha256:1782cafde43390b032f960c0fad3def745fac18994ced169003cb56e9a93c028 size: 1365
- 拉取指定版本的远程镜像。
docker pull registry.cn-shanghai.aliyuncs.com/space_test001/demo:v1