Docker series: 6. Build a Docker image from file

These notes will help you build docker image from the file.

1. Create a directory

[root@machine1 ~]# mkdir myImage
[root@machine1 ~]# cd myImage/
[root@machine1 myImage]# vi Dockerfile

2.Create a file with the following content

[root@machine1 myImage]# cat Dockerfile
FROM centos:latest
MAINTAINER “jack sparrow”
RUN yum install -y git wget python perl
CMD [“echo” , “This is Dockerfile which will create centos 7 image with above packeges.” ]

3. Use the following command;

docker build -t mycentosimage:pack1.0 .
[root@machine1 myImage]# docker build -t mycentosimage:pack1.0 .
Sending build context to Docker daemon  2.048kB
Step 1/4 : FROM centos:latest
 ---> 9f38484d220f
Step 2/4 : MAINTAINER "jack sparrow"
 ---> Running in 82b57c8a3e0e
Removing intermediate container 82b57c8a3e0e
 ---> 9c6df2adc37d
Step 3/4 : RUN yum install -y git wget python perl
 ---> Running in c2a23dd2d07b
Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
 * base: mirror.dhakacom.com
 * extras: centos-hcm.viettelidc.com.vn
 * updates: centos-hcm.viettelidc.com.vn
Resolving Dependencies
--> Running transaction check
---> Package git.x86_64 0:1.8.3.1-20.el7 will be installed
....
....
....
Complete!
Removing intermediate container c2a23dd2d07b
 ---> 1d5fb1159e18
Step 4/4 : CMD ["echo" , "This is Dockerfile which will create centos 7 image with above packeges." ]
 ---> Running in 7f7cd5e0834c
Removing intermediate container 7f7cd5e0834c
 ---> eca72e1a5c53
Successfully built eca72e1a5c53
Successfully tagged mycentosimage:pack1.0

4. Verify image name as mycentosimage:

[root@machine1 myImage]# docker image ls
REPOSITORY                      TAG                 IMAGE ID            CREATED             SIZE
mycentosimage                   pack1.0             eca72e1a5c53        2 minutes ago       385MB
jacksparrow007/hadooppresetup   latest              2c3a110c721e        13 hours ago        658MB
ubuntu                          latest              4c108a37151f        4 weeks ago         64.2MB
centos                          centos7             9f38484d220f        4 months ago        202MB
centos                          latest              9f38484d220f        4 months ago        202MB
hello-world                     latest              fce289e99eb9        6 months ago        1.84kB
[root@machine1 myImage]#

5. Run your Docker image:

[root@machine1 myImage]# docker run mycentosimage:pack1.0
This is Dockerfile which will create centos 7 image with above packeges.
[root@machine1 myImage]#

Series next read,

https://medium.com/cloudscoop/cloudscoop-remove-docker-container-c752f2e1a91d