容器镜像

安装配置镜像仓库

docker-distribution 安装
# yum -y install docker-distribution
# systemctl enable docker-distribution.service
# systemctl start docker-distribution.service
# systemctl status docker-distribution.service
启用TLS协议传输，生成自签名证书
# mkdir /etc/crts/ && cd /etc/crts
# openssl req -newkey rsa:2048 -nodes -keyout example.com.key -x509 -days 365 -out example.com.crt -subj "/C=CN/ST=GD/L=BJ/O=Global Security/OU=IT Department/CN=*.example.com"
Note
 如上命令生成 example.com.crt 和 example.com.key。
编辑 /etc/docker-distribution/registry/config.yml 配置 TLS
http:
    addr: :443
    tls:
        certificate: /etc/crts/example.com.crt
        key: /etc/crts/example.com.key
客户端安装自签名证书
# scp root@registry.example.com/etc/crts/example.com.crt /etc/pki/ca-trust/source/anchors/
# update-ca-trust extract
# systemctl restart docker

容器镜像管理

docker save 导出镜像到 tar 文件
# docker save -o mysql.tar docker.io/mysql:5.6
docker load 加载镜像
# docker load -i mysql.tar
docker tag 标记镜像
# docker tag docker.io/mysql:5.6 registry.example.com/mysql:5.6
docker push 推送镜像到镜像仓库
# docker push registry.example.com/mysql:5.6
docker rmi 删除镜像
# docker rmi registry.example.com/mysql:5.6
Note
 docker rmi $(docker images -q) 可以删除所有镜像。
docker pull 下载镜像
# docker pull registry.example.com/mysql:5.6

二次定制镜像

启动容器化 httpd 服务
# docker run --name httpd -p 8081:80 -d httpd:2.4
# curl http://localhost:8081
<html><body><h1>It works!</h1></body></html>
创建一个新的 html 页面
# docker exec -it httpd bash
root@6c2c7ecbd9ed:/usr/local/apache2# echo "This is test page!" > htdocs/test.html
root@6c2c7ecbd9ed:/usr/local/apache2# exit
# curl http://localhost:8081/test.html
This is test page!
docker diff 查看镜像的变化
# docker diff httpd
定制新镜像并标记
# docker commit -a "Kylin Soong" -m "add test page" httpd
# docker images
# docker tag 19277e943995 registry.example.com/httpd:2.4
推送新定制的镜像到镜像仓库
# docker push registry.example.com/httpd:2.4
运行新定制的镜像
# docker run --name httpd -p 8081:80 -d registry.example.com/httpd:2.4
# curl http://localhost:8081/test.html
This is test page!

Dockerfile 创建镜像

构建一个 apache httpd 镜像

创建 Dockerfile
FROM rhel7.4

MAINTAINER Kylin Soong "kylinsoong.1214@gmail.com"

LABEL description="A basic Apache container on RHEL 7"

ADD local.repo /etc/yum.repos.d/local.repo
RUN yum -y update && \
    yum install -y httpd && \
    yum clean all

RUN echo "Hello World" > /var/www/html/index.html

EXPOSE 80

CMD ["httpd", "-D", "FOREGROUND"]
local.repo 内容
[local]
baseurl = http://yum.example.com/repo/
name = Local (RPMS)
gpgcheck = 0
enabled = 1
docker build 构建镜像
# ls
Dockerfile  local.repo
# docker build -t registry.example.com/apache-httpd:2.4 .
Sending build context to Docker daemon 3.072 kB
Step 1 : FROM rhel7.4
 ---> d01d4f01d3c4
Step 2 : MAINTAINER Kylin Soong "kylinsoong.1214@gmail.com"
 ---> Using cache
 ---> a897bb58928d
Step 3 : LABEL description "A basic Apache container on RHEL 7"
 ---> Using cache
 ---> 7c04350cf576
Step 4 : ADD local.repo /etc/yum.repos.d/local.repo
 ---> 734c01cf222b
Removing intermediate container a40dfff8cdbf
Step 5 : RUN yum -y update &&     yum install -y httpd &&     yum clean all
 ---> Running in ba3ca005984a
Step 6 : RUN echo "Hello World" > /var/www/html/index.html
 ---> Running in 418cc0b4bc95
 ---> 013ea84104d3
Removing intermediate container 418cc0b4bc95
Step 7 : EXPOSE 80
 ---> Running in b3371bb80e09
 ---> 2785968e5312
Removing intermediate container b3371bb80e09
Step 8 : CMD httpd -D FOREGROUND
 ---> Running in f96d1dc1249f
 ---> 20ea4abe3bce
Removing intermediate container f96d1dc1249f
Successfully built 20ea4abe3bce
运行测试镜像，并将镜像推送到私有镜像仓库
# docker run --name apache-httpd -p 8081:80 -d registry.example.com/apache-httpd:2.4
# curl http://127.0.0.1:8081
Hello World
# docker stop apache-httpd
# docker rm apache-httpd
# docker push registry.example.com/apache-httpd:2.4

构建 ksoong.org 镜像

本部分将 http://ksoong.org/ 内容构建成一个容器镜像。

创建 Dockerfile
FROM rhel7.4

MAINTAINER Kylin Soong "kylinsoong.1214@gmail.com"

LABEL description="Kylin Soong.Blog"

ADD local.repo /etc/yum.repos.d/local.repo
RUN yum -y update && \
    yum install -y httpd && \
    yum clean all

EXPOSE 80

COPY ./blog/ /var/www/html/

CMD ["httpd", "-D", "FOREGROUND"]
docker build 构建镜像
# ls
blog  Dockerfile  local.repo
# docker rmi registry.example.com/ksoong.org:1.0
运行镜像
# docker run --name ksoong.org -p 80:80 -d registry.example.com/ksoong.org:1.0
Note
 镜像启动后本地浏览器访问 http://localhost/。
推送博客镜像到私有镜像仓库
# docker push registry.example.com/ksoong.org:1.0

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