The size of the docker Image was suddenly increasing, I will check it. Using docker history <Image name> you can check the change history for Image before.
Docker pull command
Requires Image to be downloaded locally. As an example, I use docker pull image centos as below
[vagrant@localhost ~]$ docker pull centos:6.10
6.10: Pulling from library/centos
1c8f9aa56c90: Pull complete
Digest: sha256:b4c3fe75b135ca1c26ef6feb8153aade8a31c4e3e763376529c1088de7e973f4
Status: Downloaded newer image for centos:6.10
[vagrant@localhost ~]$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos 6.10 30e66b619e9f 4 months ago 194MB
Try it
The output order is new, and it seems that it becomes an old layer as going down as below
[vagrant@localhost ~]$ docker history centos:6.10
IMAGE CREATED CREATED BY SIZE COMMENT
30e66b619e9f 4 months ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0B
<missing> 4 months ago /bin/sh -c #(nop) LABEL org.label-schema.sc… 0B
<missing> 4 months ago /bin/sh -c #(nop) ADD file:769078df784180af4… 194MB
Also, With the “–human” option , the actual date is displayed as below
[vagrant@localhost ~]$ docker history centos:6.10 --human=false
IMAGE CREATED AT CREATED BY SIZE COMMENT
30e66b619e9f 2018-10-10T01:22:51+07:00 /bin/sh -c #(nop) CMD ["/bin/bash"] 0
<missing> 2018-10-10T01:22:51+07:00 /bin/sh -c #(nop) LABEL org.label-schema.sc… 0
<missing> 2018-10-10T01:22:51+07:00 /bin/sh -c #(nop) ADD file:769078df784180af4… 193889316
Docker inspect container information
Using docker inspect command to Confirmation of container information.
[vagrant@localhost ~]$ docker inspect centos:6.10
[
{
"Id": "sha256:30e66b619e9f73941f418bb08a081132607433f5b8ccaefd3b7bceb08c770b20",
"RepoTags": [
"centos:6.10"
],
"RepoDigests": [
"centos@sha256:b4c3fe75b135ca1c26ef6feb8153aade8a31c4e3e763376529c1088de7e973f4"
],
"Parent": "",
"Comment": "",
"Created": "2018-10-09T18:22:51.586650744Z",
"Container": "9a31860c3402344acd1f16127fec864b93038c86e8716f08e5dc2a60851a602e",
"ContainerConfig": {
"Hostname": "9a31860c3402",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/bin/sh",
"-c",
"#(nop) ",
"CMD [\"/bin/bash\"]"
],
"ArgsEscaped": true,
"Image": "sha256:34321cccc68dac29b496363ca05c47e7f23c3e59d664fea4de03695975443b8b",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"org.label-schema.build-date": "20180804",
"org.label-schema.license": "GPLv2",
"org.label-schema.name": "CentOS Base Image",
"org.label-schema.schema-version": "1.0",
"org.label-schema.vendor": "CentOS"
}
},
"DockerVersion": "17.06.2-ce",
"Author": "",
"Config": {
"Hostname": "",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/bin/bash"
],
"ArgsEscaped": true,
"Image": "sha256:34321cccc68dac29b496363ca05c47e7f23c3e59d664fea4de03695975443b8b",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"org.label-schema.build-date": "20180804",
"org.label-schema.license": "GPLv2",
"org.label-schema.name": "CentOS Base Image",
"org.label-schema.schema-version": "1.0",
"org.label-schema.vendor": "CentOS"
}
},
"Architecture": "amd64",
"Os": "linux",
"Size": 193889316,
"VirtualSize": 193889316,
"GraphDriver": {
"Data": {
"MergedDir": "/var/lib/docker/overlay2/f799911e2d9e2de958ee359b6a6e125a93a69992c34851acb63ec1f22e2f9da2/merged",
"UpperDir": "/var/lib/docker/overlay2/f799911e2d9e2de958ee359b6a6e125a93a69992c34851acb63ec1f22e2f9da2/diff",
"WorkDir": "/var/lib/docker/overlay2/f799911e2d9e2de958ee359b6a6e125a93a69992c34851acb63ec1f22e2f9da2/work"
},
"Name": "overlay2"
},
"RootFS": {
"Type": "layers",
"Layers": [
"sha256:18c81886066a186e754291bab5ae87b273b274c66c2c9fea8e869a7cb67dac1b"
]
},
"Metadata": {
"LastTagTime": "0001-01-01T00:00:00Z"
}
}
]
Extract only environment variables as below
[vagrant@localhost ~]$ docker inspect --format='{{range .Config.Env}}{{println .}}{{end}}' centos:6.10
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
Conclusion
Thought the article, You can inspect “Docker images history” as above. I hope will this your helpful.