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Dockerfile+私有仓库

news 来源：原创 2024/9/20 9:30:00

使用Dockerfile创建应用镜像

在Docker file中定义所需要执⾏的指令，使⽤ docker build创建镜像，过程中会按照dockerfile所定义的内容进⾏打开临时性容器，把docker file中命令全部执⾏完成，就得到了⼀个容器应⽤镜像，每⼀⾏命令都会出现容器，都会使⽤docker commit进⾏提交⼀个临时性的镜像

Docker file关键字

1.FORM 指定基础镜像为该镜像的最后修改版本

2.FROM <image :tag>指定基础镜像为该镜像的⼀个tag版本

3.MAINTAINER 指定镜像创建者，企业内部不⽤指定，对外发布也可以不指定

3.RUN 运⾏命令，安装软件

4.CMD 设置container启动时进⾏的操作，如果容器镜像中有这个命名，启动容器时，不要⼿动让容器执⾏其他命令

5.ENTRYPORINT（⼊⼝点）cmd每次只能执⾏⼀个指令， entrypoint可以多⾏执⾏。

6.USER设置容器进程的⼀些⽤户

7.EXPOSE 暴露端⼝指定容器需要映射到宿主机的端⼝

8.ENV 设置环境变量 -e

9.ADD 从宿主机src复制⽂件到容器的dest路径

10.volumn 指定挂载点

11.WROKDIR 切换⽬录

12.ONBUILD在⼦镜像中执⾏指令

通过dockerfile创建⼀个在启动容器时，就可以启动httpd服务的镜像

步骤：

1.创建⼀个⽬录，⽤于存储Docker file所使⽤的⽂件

2.在此⽬录中创建Docker file⽂件，以及镜像制作所使⽤的⽂件

3.使⽤docker build创建镜像

4.使⽤创建的镜像启动容器（验证）

[root@docker ~]# mkdir httpd0
[root@docker ~]# cd httpd0

编辑启动脚本：启动http服务
[root@docker httpd0]# vim abc.sh

#!/bin/bash
rm -rf /run/httpd/*
exec /sbin/httpd -D FOREGROUND
[root@docker httpd0]# ls
abc.sh

编辑index.html文件：
[root@docker httpd0]# echo "httpd server is running" > index.html
[root@docker httpd0]# ls
abc.sh index.html

编辑Dockerfile

[root@docker httpd0]#vim Dockerfile

FROM    centos:latestMAINTAINER      "centos httpd server"RUN     rm -rf /etc/yum.repos.d/*RUN     curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repoRUN     yum clean all && yum makecacheRUN     yum -y install epel-releaseRUN     yum -y install httpdADD     abc.sh  /abc.shADD     index.html /var/www/html/index.htmlRUN     chmod -v +x /abc.shCMD     ["/bin/bash","/abc.sh"]

创建镜像

[root@docker httpd0]# docker build -t centos:httpd .

查看镜像

创建容器测试

[root@docker httpd0]#docker run -d --name c0 centos:httpd
e50856f7eee27e8aa8d9803ffd11f4b8f02c67bce489165f39f9251acf143f6b
[root@docker httpd0]# docker ps --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e50856f7eee2 centos:httpd "/bin/bash /abc.sh" 8 seconds ago Up 7 seconds c0

查看IP地址

[root@docker httpd0]#docker inspect c0

[root@docker httpd0]#curl 172.17.0.3
httpd server is running

通过Dockerfile创建yum镜像

在上述的配置（通过Dockerfile创建httpd镜像）中进行修改：

[root@docker httpd0]#vim Dockerfile

FROM    centos:latestMAINTAINER      "centos httpd server"RUN     rm -rf /etc/yum.repos.d/*RUN     curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repoRUN     yum clean all && yum makecacheRUN     yum -y install epel-release

[root@docker httpd0]# docker build -t centos:yum .

[root@docker httpd0]# docker run -it --name c1 centos:yum /bin/bash
crtl+p+q
[root@docker httpd0]# docker ps --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e36a888b2a24 centos:yum "/bin/bash" 29 seconds ago Up 28 seconds c1
e50856f7eee2 centos:httpd "/bin/bash /abc.sh" 23 minutes ago Up 23 minutes c0

通过Dockerfile创建nginx镜像

利用已经存在的yum镜像来创建nginx镜像

[root@docker ~]#mkdir 002

[root@docker ~]#cd 002

[root@docker 002]# vim Dockerfile

FROM    centos:yum
MAINTAINER      和平
RUN     yum -y install epel-release
RUN     yum -y install nginx
RUN     echo "daemon off;" >> /etc/nginx/nginx.conf
EXPOSE  80
CMD     /usr/sbin/nginx

[root@docker 002]#docker build -t centos:nginx .

[root@docker 002]# docker run -d --name c2 centos:nginx
f18c2b57f40f442726b1837d4c28f96dcb17c4c812ecfbac532d4ae2692fc98b
[root@docker 002]# docker ps --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f18c2b57f40f centos:nginx "/bin/sh -c /usr/sbi…" 12 seconds ago Up 11 seconds 80/tcp c2

私有仓库

1.安装仓库镜像

[root@docker ~]# docker pull registry

2.创建容器，映射端⼝，挂载⽂件

# 创建挂载目录
[root@docker ~]# mkdir /regist# 查看容器--全部删掉
[root@docker ~]# docker ps --all
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES# 创建容器，映射端⼝，挂载⽂件
[root@docker ~]# docker run -d --name r1 -v /regist/:/var/lib/registry -p5000:5000 registry:latest
4cd2b4d2c49fb4bdc6cf64aacea6c72a38f2c0eb3beccc6ed6845447b081a06f# 查看创建的容器
[root@docker ~]# docker ps --all
CONTAINER ID   IMAGE             COMMAND                   CREATED         STATUS         PORTS                                       NAMES
4cd2b4d2c49f   registry:latest   "/entrypoint.sh /etc…"   3 seconds ago   Up 2 seconds   0.0.0.0:5000->5000/tcp, :::5000->5000/tcp   r1# 访问目录页
[root@docker ~]# curl localhost:5000/v2/_catalog
{"repositories":[]}

3.浏览器访问：192.168.118.55:5000/v2/_catalog

4.配置pull和push，修改daemon.json文件

[root@docker ~]# vim /etc/docker/daemon.json{"registry-mirrors": ["https://do.nark.eu.org","https://dc.j8.work","https://docker.m.daocloud.io","https://dockerproxy.com","https://docker.mirrors.ustc.edu.cn","https://docker.nju.edu.cn"],"hosts":  ["tcp://0.0.0.0:2375","unix:///var/run/docker.sock"],"insecure-registries":["http://192.168.118.55:5000"]
}

5.修改了daemon.json文件，重启服务

[root@docker ~]# systemctl restart docker.service

6.启动registry容器

# 查看容器
[root@docker ~]# docker ps --all
CONTAINER ID   IMAGE             COMMAND                   CREATED          STATUS                     PORTS     NAMES
4cd2b4d2c49f   registry:latest   "/entrypoint.sh /etc…"   10 minutes ago   Exited (2) 2 minutes ago             r1# 启动r1容器
[root@docker ~]# docker start r1
r1# 访问⽬录⻚
[root@docker ~]# curl localhost:5000/v2/_catalog
{"repositories":[]}

7.给yum镜像打标签

# 为要上传的镜像添加标记
[root@docker ~]# docker tag centos:yum 192.168.118.55:5000/centos:yum

# 查看打标签的镜像
[root@docker ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
192.168.118.50:5000/centos yum ee9375ac855c 2 hours ago 272MB
centos yum ee9375ac855c 2 hours ago 272MB
registry latest cfb4d9904335 10 months ago 25.4MB

8.将打标签的镜像上传

[root@docker ~]# docker push 192.168.118.55:5000/centos:yum

9.在主机上进行访问

[root@docker ~]# curl localhost:5000/v2/_catalog
{"repositories":["centos"]}

10.浏览器访问：192.168.118.55:5000/v2/_catalog

11.查看regist文件

[root@docker ~]# ls /regist/
docker
[root@docker ~]# cd /regist/docker/
[root@docker docker]# ls
registry
[root@docker docker]# cd registry/
[root@docker registry]# ls
v2
[root@docker registry]# cd v2
[root@docker v2]# ls
blobs  repositories
[root@docker v2]# cd repositories/
[root@docker repositories]# ls
centos
[root@docker repositories]# cd centos/
[root@docker centos]# ls
_layers  _manifests  _uploads
[root@docker centos]# cd _layers/
[root@docker _layers]# ls
sha256
[root@docker _layers]# cd sha256/
[root@docker sha256]# ls
30902bbca4a1d948703fd88d834ddf4dc8db69bb7e787ff18a762b6b4761fe37
46aacd2dd64664a37b01ee3a9f37561ed9b34c5af6661b880ee07a15d5fe8fd6
5a3d9ba04912ac6b1353410a0f18cc206b4920888e3187443abacefe3c9086ab
a1d0c75327776413fa0db9ed3adcdbadedc95a662eb1d360dad82bb913f8a1d1
ca847d29e1079f24cfc92b68cf37d5866060814df67cbdcd83edb16f1dc4fe54
ee9375ac855c3a1f8ec3eb03cee9317c3127e4be47cb3d6f519d9e6921a6a044

测试：

在docker上上传镜像（192.168.118.55）

[root@docker ~]# systemctl start docker
[root@docker ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
192.168.118.55:5000/centos yum 11c7f617cd4a 17 hours ago 272MB
centos yum 11c7f617cd4a 17 hours ago 272MB
[root@docker ~]# docker ps --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3f0f62812f33 registry:latest "/entrypoint.sh /etc…" 17 hours ago Exited (255) About a minute ago 0.0.0.0:5000->5000/tcp, :::5000->5000/tcp r1
[root@docker ~]# docker start r1
r1

[root@docker ~]# docker ps --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3f0f62812f33 registry:latest "/entrypoint.sh /etc…" 17 hours ago Up 33 seconds 0.0.0.0:5000->5000/tcp, :::5000->5000/tcp r1

[root@docker ~]# netstat -lnput | grep 5000
tcp 0 0 0.0.0.0:5000 0.0.0.0:* LISTEN 1600/docker-proxy
tcp6 0 0 :::5000 :::* LISTEN 1604/docker-proxy

新建一台docker机器，作为客户端来拉取刚在docker主机上上传的镜像

12 sh docker.sh //安装docker的脚本
17 vim /etc/docker/daemon.json

20 systemctl restart docker
21 docker pull 192.168.118.55:5000/centos:yum
[root@docker1 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
192.168.118.55:5000/centos yum 11c7f617cd4a 18 hours ago 272MB

[root@docker1 ~]# docker run -d --name c5 192.168.118.55:5000/centos:yum
2fca882e6fbb4818f436b3b202b0cfab8ebffd5540f25fa6cba062b6db9f5ff9
[root@docker1 ~]# docker ps --all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2fca882e6fbb 192.168.118.55:5000/centos:yum "/bin/bash" About a minute ago Exited (0) About a minute ago c5