pull any image from docker hub
node1] (local) root@192.168.0.38 ~
$ docker pull sangam14/dockerapp:latest
latest: Pulling from sangam14/dockerapp
bc9ab73e5b14: Pull complete
193a6306c92a: Pull complete
e5c3f8c317dc: Pull complete
a587a86c9dcb: Pull complete
72744d0a318b: Pull complete
6598fc9d11d1: Pull complete
74d2ee7772b2: Pull complete
ab2e66176e69: Pull complete
2c4175ee7cad: Pull complete
789162b0d7d2: Pull complete
f60124694c7d: Pull complete
a1967c52a9d1: Pull complete
Digest: sha256:85af81f78a2049238d51fdfd40851e83b38ec782508f5226b6ac4a4f026a4517
Status: Downloaded newer image for sangam14/dockerapp:latest
docker.io/sangam14/dockerapp:latest
[node1] (local) root@192.168.0.38 ~
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nicolaka/netshoot latest 7aee1b82c22c 7 weeks ago 204MB
sangam14/dockerapp latest 83e6db363153 10 months ago 928MB
[node1] (local) root@192.168.0.38 ~
inspect doker image
$ docker inspect 83e6db363153
[
{
"Id": "sha256:83e6db363153fe557da238a6ca870e497d66d4108cc11565dd3e61f6247ff8f3",
"RepoTags": [
"sangam14/dockerapp:latest"
],
"RepoDigests": [
"sangam14/dockerapp@sha256:85af81f78a2049238d51fdfd40851e83b38ec782508f5226b6ac4a4f026a4517"
],
"Parent": "",
"Comment": "",
"Created": "2018-10-24T22:24:11.290507481Z",
"Container": "f5b0531f2b9e9cd810043dd8427b2b821e7e16ca6869c3c82cbc93df9fa09516",
"ContainerConfig": {
"Hostname": "f5b0531f2b9e",
"Domainname": "",
"User": "admin",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"LANG=C.UTF-8",
"GPG_KEY=97FC712E4C024BBEA48A61ED3A5CA953F73C700D",
"PYTHON_VERSION=3.5.6",
"PYTHON_PIP_VERSION=18.1"
],
"Cmd": [
"/bin/sh",
"-c",
"#(nop) ",
"CMD [\"python\" \"app.py\"]"
],
"ArgsEscaped": true,
"Image": "sha256:97dcd837db0793a83e84578aaa436c0c4fb73b13b133dfdb1430633ae490d4c3",
"Volumes": null,
"WorkingDir": "/app",
"Entrypoint": null,
"OnBuild": [],
"Labels": {}
},
"DockerVersion": "17.09.0-ce",
"Author": "",
"Config": {
"Hostname": "",
"Domainname": "",
"User": "admin",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"LANG=C.UTF-8",
"GPG_KEY=97FC712E4C024BBEA48A61ED3A5CA953F73C700D",
"PYTHON_VERSION=3.5.6",
"PYTHON_PIP_VERSION=18.1"
],
"Cmd": [
"python",
"app.py"
],
"ArgsEscaped": true,
"Image": "sha256:97dcd837db0793a83e84578aaa436c0c4fb73b13b133dfdb1430633ae490d4c3",
"Volumes": null,
"WorkingDir": "/app",
"Entrypoint": null,
"OnBuild": [],
"Labels": null
},
"Architecture": "amd64",
"Os": "linux",
"Size": 928403545,
"VirtualSize": 928403545,
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/933c99ebfa9c3d769fb6ca6e7a74a98da1cf99511cfc12e2d0a66b1e82bdd925/diff:/var/lib/docker/overlay2/8c9c2fac9ff435b9925e8ab27bd8b9cea76b4e4ce549f643fdfb81e427e4543d/diff:/var/lib/docker/overlay2/6201f524de51b46688cb280e300d255294a57a4a1ca41f0f5e651d5576af14e2/diff:/var/lib/docker/overlay2/8cacd218afe992c661fa85053b3dded4cad1d97e1786f313d9536e89780f6c78/diff:/var/lib/docker/overlay2/1b540160d3742f2bcd2ee23a7ea8b7d9c4e2dee554bb09d690f02a2523eacb6c/diff:/var/lib/docker/overlay2/30f6e875d27ab69d789acb6ec05c3cfb8f64a7cb8a08fd84aa91f49b5a38e067/diff:/var/lib/docker/overlay2/0febbfec2582b51b17de2f4ad6d1c90159aa4e3e3cd3fb22d8d975562f669c32/diff:/var/lib/docker/overlay2/cd85010031ef17376451c38405f089142d938a66a3b4cc4f224cbd5c0bfa1ce5/diff:/var/lib/docker/overlay2/0d40a5632dfa87824b152cea7af3a3e1a0c2498622c9c6d7042ef51e19435395/diff:/var/lib/docker/overlay2/ac1e5f00f5240ca03c71a0b08d3507cec25b0c96c2416fa2ea8aa6804f6ad773/diff:/var/lib/docker/overlay2/00210fd1e43aaff1f2c72d06e2893da04b7155e320a843bf5b200280847e1e00/diff",
"MergedDir": "/var/lib/docker/overlay2/de139dfea3177bb918b0df263ed6c4f6b1914ff4e8c3987d50a5385124789f2f/merged",
"UpperDir": "/var/lib/docker/overlay2/de139dfea3177bb918b0df263ed6c4f6b1914ff4e8c3987d50a5385124789f2f/diff",
"WorkDir": "/var/lib/docker/overlay2/de139dfea3177bb918b0df263ed6c4f6b1914ff4e8c3987d50a5385124789f2f/work"
},
"Name": "overlay2"
},
"RootFS": {
"Type": "layers",
"Layers": [
"sha256:f715ed19c28b66943ac8bc12dbfb828e8394de2530bbaf1ecce906e748e4fdff",
"sha256:8bb25f9cdc41e7d085033af15a522973b44086d6eedd24c11cc61c9232324f77",
"sha256:08a01612ffca33483a1847c909836610610ce523fb7e1aca880140ee84df23e9",
"sha256:1191b3f5862aa9231858809b7ac8b91c0b727ce85c9b3279932f0baacc92967d",
"sha256:9978d084fd771e0b3d1acd7f3525d1b25288ababe9ad8ed259b36101e4e3addd",
"sha256:2f4f74d3821ecbdd60b5d932452ea9e30cecf902334165c4a19837f6ee636377",
"sha256:d43a37baac4bdbb691f01331562e2f383295db93d7542fa0b134976c77446258",
"sha256:aaa5e8fca5a449d01fc834b0a5a7df7f87e4977972241c14abb3d55f02410e12",
"sha256:9fdef360c1b961c36c63eac703aaca2f923c796537bc9d24b8252caf7c766853",
"sha256:943b307641ec639376c7e507a9950f550e249dcd4380c3bcb92b7b57b977ae43",
"sha256:31badc7263aab2db2286d51b22bc31be6958f7593dc169b2bf53d8d5323abfd4",
"sha256:aae0023198f11bacc3cfe14ac21def1371f92d96461b5b4b463acc6547e83dc5"
]
},
"Metadata": {
"LastTagTime": "0001-01-01T00:00:00Z"
}
}
]
docker history
$ docker history sangam14/dockerapp:latest
IMAGE CREATED CREATED BY SIZE COMMENT
83e6db363153 10 months ago /bin/sh -c #(nop) CMD ["python" "app.py"] 0B
10 months ago /bin/sh -c #(nop) WORKDIR /app 0B
10 months ago /bin/sh -c #(nop) COPY dir:a3f65691c461225ae… 1.75kB
10 months ago /bin/sh -c #(nop) USER [admin] 0B
10 months ago /bin/sh -c useradd -ms /bin/bash admin 333kB
10 months ago /bin/sh -c pip install Flask==0.11.1 redis==… 11.4MB
10 months ago /bin/sh -c #(nop) CMD ["python3"] 0B
10 months ago /bin/sh -c set -ex; wget -O get-pip.py 'ht… 5.92MB
10 months ago /bin/sh -c #(nop) ENV PYTHON_PIP_VERSION=18… 0B
10 months ago /bin/sh -c cd /usr/local/bin && ln -s idle3… 32B
10 months ago /bin/sh -c set -ex && wget -O python.tar.x… 64.1MB
10 months ago /bin/sh -c #(nop) ENV PYTHON_VERSION=3.5.6 0B
10 months ago /bin/sh -c #(nop) ENV GPG_KEY=97FC712E4C024… 0B
10 months ago /bin/sh -c apt-get update && apt-get install… 16.8MB
10 months ago /bin/sh -c #(nop) ENV LANG=C.UTF-8 0B
10 months ago /bin/sh -c #(nop) ENV PATH=/usr/local/bin:/… 0B
10 months ago /bin/sh -c set -ex; apt-get update; apt-ge… 556MB
10 months ago /bin/sh -c apt-get update && apt-get install… 142MB
10 months ago /bin/sh -c set -ex; if ! command -v gpg > /… 7.8MB
10 months ago /bin/sh -c apt-get update && apt-get install… 23.2MB
10 months ago /bin/sh -c #(nop) CMD ["bash"] 0B
10 months ago /bin/sh -c #(nop) ADD file:b3598c18dc395846a… 101MB
[node1] (local) root@192.168.0.38 ~
$ docker run -d --hostname c1 --name test1 nicolaka/netshoot:latest sleep 50000
151085f99ccee4ddf5b4bab822970aa3bfa321e844ae818c5a2a8140d5cefc16
[node1] (local) root@192.168.0.38 ~
$ ps aux | grep sleep
976 1000 0:00 sleep 50000
1365 root 0:00 sleep 50000
1412 root 0:00 grep sleep
[node1] (local) root@192.168.0.38 ~
$ docker exec -it test1 sh
/ # ls
bin dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
/ # cd home/
/home # hostname
c1
/home # ifconfig
eth0 Link encap:Ethernet HWaddr 02:42:AC:11:00:03
inet addr:172.17.0.3 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
/home # exit
[node1] (local) root@192.168.0.38 ~
$ cat /proc/976/cgroup
11:cpuset:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
10:freezer:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
9:pids:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
8:net_cls,net_prio:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
7:perf_event:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
6:devices:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
5:blkio:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
4:cpu,cpuacct:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
3:hugetlb:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
2:memory:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
1:name=systemd:/docker/74d7a9a473c427f9ffd14a937033fab7d553e3e919d0f606eb2e4ab42640945c/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f
[node1] (local) root@192.168.0.38 ~
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
151085f99cce nicolaka/netshoot:latest "sleep 50000" 19 minutes ago Up 19 minutes test1
2db351326c6d sangam14/dockerapp:latest "sleep 50000" 25 minutes ago Up 25 minutes test
[node1] (local) root@192.168.0.38 ~
$ cat /sys/fs/cgroup/memory/docker/2db351326c6dc1d1a267ec0f4321ba0302e0f98b2daf0ddeaaaecab9498c256f/memory.limit_in_bytes
9223372036854771712
$ sudo nscenter --target 976 --net
$ sudo nscenter --target 976 --net --mount