Podman实现

本实验不需要安装docker服务

1) 安装podman
[root@srv ~]# yum install podman -y

2) 使用podman下载镜像
[root@srv ~]# podman search centos

[root@srv ~]# podman pull centos

3) 运行容器
[root@srv ~]# podman run centos /bin/echo "Welcome to the Podman World"
Welcome to the Podman World

4) 进入容器
[root@srv ~]# podman run -it centos bash
[root@f41309b436ca /]# 

5) 生成镜像
[root@srv ~]# podman run centos bash -c "yum -y install httpd"

[root@srv ~]# podman commit be01 snow-httpd
Getting image source signatures
Copying blob 0683de282177 skipped: already exists
Copying blob 468c61d2adf7 done
Copying config fa8ffe486a done
Writing manifest to image destination
Storing signatures
fa8ffe486a7a57b61c1dc64936277ed73bf6136f8dbfd5e1063ed4812b0b6a8c

[root@srv ~]# podman images
REPOSITORY                 TAG      IMAGE ID       CREATED          SIZE
localhost/snow-httpd       latest   fa8ffe486a7a   43 seconds ago   291 MB
docker.io/library/centos   latest   470671670cac   4 weeks ago      245 MB

6) 运行镜像
[root@srv ~]# podman run -dt -p 80:80 localhost/snow-httpd /usr/sbin/apachectl -D FOREGROUND
a8c327da36b991f7d447e2a5c0fed72372bc41c57acb48c24e3aca32c8011ce7

[root@srv ~]# podman ps
CONTAINER ID  IMAGE                        COMMAND               CREATED         STATUS             PORTS               NAMES
a8c327da36b9  localhost/snow-httpd:latest  /usr/sbin/apachec...  30 seconds ago  Up 29 seconds ago  0.0.0.0:80->80/tcp  laughing_feistel

# 添加index.html页面
[root@srv ~]# podman exec -it a8c3 bash -c 'echo "Hello 1000cc" > /var/www/html/index.html'

# 获取容器的IP地址
[root@srv ~]# podman inspect -l | grep \"IPAddress
            "IPAddress": "10.88.0.14",

# 访问测试
[root@srv ~]# curl 10.88.0.14
Hello 1000cc

# 删除容器
[root@srv ~]# podman kill a8c3
a8c327da36b991f7d447e2a5c0fed72372bc41c57acb48c24e3aca32c8011ce7

7) 挂载容器到本地系统
[root@srv ~]# podman run -itd --name snow -h snowchuai centos /bin/bash
1ebae9292cb4251e638be009bf5c29836d2f31ba31274aa5c3328cf082c7416f

[root@srv ~]# podman mount snow
/var/lib/containers/storage/overlay/d799...4f3364307fcb20658/merged

[root@srv ~]# df -Th | grep merged
overlay                      overlay    38G  2.4G   36G   7% /var/lib/containers/storage/overlay/d7995...4d34f3364307fcb20658/merged

[root@srv ~]# podman umount snow

8) 编写Dockerfile生成新镜像
[root@srv ~]# vim Dockerfile
FROM centos
MAINTAINER snowchuai <snow@1000cc.net>

RUN yum -y install httpd
RUN echo "Hello 1000cc.net" > /var/www/html/index.html

EXPOSE 80
CMD ["/usr/sbin/apachectl", "-D", "FOREGROUND"]

[root@srv ~]# podman build -t snowchuai-httpd:latest .

[root@srv ~]# podman images
REPOSITORY                  TAG      IMAGE ID       CREATED          SIZE
localhost/snowchuai-httpd   latest   516fb2ceb0fd   10 seconds ago   291 MB
localhost/snow-centos       latest   806a42f92272   2 minutes ago    245 MB
localhost/snow-httpd        latest   fa8ffe486a7a   18 minutes ago   291 MB
docker.io/library/centos    latest   470671670cac   4 weeks ago      245 MB

9) 删除所有的容器及镜像
[root@srv ~]# podman rm -f --all
1ebae9292cb4251e638be009bf5c29836d2f31ba31274aa5c3328cf082c7416f

[root@srv ~]# podman rmi -f --all
fa8ffe486a7a57b61c1dc64936277ed73bf6136f8dbfd5e1063ed4812b0b6a8c
58f6fea2078182ef55b7848ced5377599849562204b2107de1dee7d353aa5987
e937be5792856f99f843ee802fd8849945162c5dc36036daa9a8626d29311662
e0e969548df6b22e96bacfda7a59e12cec050a1ab81ce8f170d3c59a3a415032
3a8429c586c803eed5524ea056aab2ee7bff592ae010430c27ccfe77b466c023
516fb2ceb0fdbd9b7e43a8e5df3f9a4a1a2c43439ba97376872870981b189270
806a42f9227276ec914bf5abf17abea37df61e59ae760ab8d8ce6d3bc5be03a8