$ whatis docker
docker (1) - Docker image and container command line interface
# docker info
Client:
Debug Mode: false
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 19.03.13
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 8fba4e9a7d01810a393d5d25a3621dc101981175
runc version:
init version: fec3683
Security Options:
apparmor
seccomp
Profile: default
Kernel Version: 5.4.0-67-generic
Operating System: Ubuntu Core 18
OSType: linux
Architecture: x86_64
CPUs: 6
Total Memory: 15.62GiB
Name: u22942380
ID: KAD6:ID6C:S7MY:QPU4:7CYN:O7RW:HPSZ:OEN2:QYDO:IGA2:YZ3D:ZCSA
Docker Root Dir: /var/snap/docker/common/var-lib-docker
Debug Mode: false
Username: hlutfy
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
WARNING: No swap limit support
# docker version
Client:
Version: 19.03.6
API version: 1.40
Go version: go1.12.17
Git commit: 369ce74a3c
Built: Fri Dec 18 12:21:44 2020
OS/Arch: linux/amd64
Experimental: false
Server:
Engine:
Version: 19.03.13
API version: 1.40 (minimum version 1.12)
Go version: go1.13.15
Git commit: bd33bbf
Built: Fri Feb 5 15:58:24 2021
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.3.7
GitCommit: 8fba4e9a7d01810a393d5d25a3621dc101981175
runc:
Version: 1.0.0-rc10
GitCommit:
docker-init:
Version: 0.18.0
GitCommit: fec3683
REPOSITORY TAG IMAGE ID CREATED SIZE
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx
Pulling fs layer [1B
Pulling fs layer [1B
Pulling fs layer [1B
Pulling fs layer [1B
Pulling fs layer [1B
Pulling fs layer Waiting Downloading
Continues here ...
...
Status: Downloaded newer image for nginx:latest
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest 62d49f9bab67 2 weeks ago 133MB
/var/www/htmlroot@u22942380:/var/www/html# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c24522a85ec0 nginx "/docker-entrypoint.…" About a minute ago Up About a minute 80/tcp strange_yonath
c24522a85ec0
# uname -a
Linux c24522a85ec0 5.4.0-67-generic #75~18.04.1-Ubuntu SMP Tue Feb 23 19:17:50 UTC 2021 x86_64 GNU/Linux
# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
# exit
exit
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest 62d49f9bab67 2 weeks ago 133MB
/var/www/htmlroot@u22942380:/var/www/html# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c24522a85ec0 nginx "/docker-entrypoint.…" 2 minutes ago Up 2 minutes 80/tcp strange_yonath
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.2 c24522a85ec0
Linux c24522a85ec0 5.4.0-67-generic #75~18.04.1-Ubuntu SMP Tue Feb 23 19:17:50 UTC 2021 x86_64 GNU/Linux
# docker exec -it c2 ls -l
total 80
drwxr-xr-x 2 root root 4096 Apr 8 00:00 bin
drwxr-xr-x 2 root root 4096 Mar 19 23:44 boot
drwxr-xr-x 5 root root 360 May 4 07:28 dev
drwxr-xr-x 1 root root 4096 Apr 13 19:20 docker-entrypoint.d
-rwxrwxr-x 1 root root 1202 Apr 13 19:20 docker-entrypoint.sh
drwxr-xr-x 1 root root 4096 May 4 07:28 etc
drwxr-xr-x 2 root root 4096 Mar 19 23:44 home
drwxr-xr-x 1 root root 4096 Apr 13 19:20 lib
drwxr-xr-x 2 root root 4096 Apr 8 00:00 lib64
drwxr-xr-x 2 root root 4096 Apr 8 00:00 media
drwxr-xr-x 2 root root 4096 Apr 8 00:00 mnt
drwxr-xr-x 2 root root 4096 Apr 8 00:00 opt
dr-xr-xr-x 247 root root 0 May 4 07:28 proc
drwx------ 1 root root 4096 May 4 07:31 root
drwxr-xr-x 1 root root 4096 May 4 07:28 run
drwxr-xr-x 2 root root 4096 Apr 8 00:00 sbin
drwxr-xr-x 2 root root 4096 Apr 8 00:00 srv
dr-xr-xr-x 13 root root 0 May 4 07:28 sys
drwxrwxrwt 1 root root 4096 Apr 13 19:20 tmp
drwxr-xr-x 1 root root 4096 Apr 8 00:00 usr
drwxr-xr-x 1 root root 4096 Apr 8 00:00 var
# systemctl status docker
docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: https://docs.docker.com
# systemctl status docker
docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; disabled; vendor preset: enabled)
Active: [0;1;32mactive (running)[0m since Tue 2021-05-04 03:32:20 EDT; 4s ago
Docs: https://docs.docker.com
Main PID: 19422 (dockerd)
Tasks: 15
CGroup: /system.slice/docker.service
└─19422 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
May 04 03:32:18 u22942380 dockerd[19422]: time="2021-05-04T03:32:18.524814050-04:00" level=warning
May 04 03:32:18 u22942380 dockerd[19422]: time="2021-05-04T03:32:18.524838111-04:00" level=warning
May 04 03:32:18 u22942380 dockerd[19422]: time="2021-05-04T03:32:18.524861059-04:00" level=warning
May 04 03:32:18 u22942380 dockerd[19422]: time="2021-05-04T03:32:18.525730653-04:00" level=info msg
May 04 03:32:19 u22942380 dockerd[19422]: time="2021-05-04T03:32:19.747436391-04:00" level=info msg
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.184183443-04:00" level=info msg
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.397696657-04:00" level=info msg
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.405438645-04:00" level=info msg
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.511263047-04:00" level=info msg
May 04 03:32:20 u22942380 systemd[1]: Started Docker Application Container Engine.
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest 62d49f9bab67 2 weeks ago 133MB
/var/www/htmlroot@u22942380:/var/www/html# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c24522a85ec0 nginx "/docker-entrypoint.…" 3 minutes ago Up 3 minutes 80/tcp strange_yonath
# docker run -it centos /bin/bash
Unable to find image 'centos:latest' locally
latest: Pulling from library/centos
[1A[2K7a0437f04f83: Pulling fs layer [1B[1A[2K7a0437f04f83:
Status: Downloaded newer image for centos:latest
...
Continues ...
...
# hostname
dad7c57e2199
# uname -a
Linux dad7c57e2199 5.4.0-67-generic #75~18.04.1-Ubuntu SMP Tue Feb 23 19:17:50 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
NAME="CentOS Linux"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
# ps -efa
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 07:33 pts/0 00:00:00 /bin/bash
root 17 1 0 07:33 pts/0 00:00:00 ps -efa
]0;@dad7c57e2199:/[root@dad7c57e2199 /]# df -h
Filesystem Size Used Avail Use% Mounted on
overlay 55G 3.9G 48G 8% /
tmpfs 64M 0 64M 0% /dev
tmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup
shm 64M 0 64M 0% /dev/shm
/dev/mapper/vg00-var 55G 3.9G 48G 8% /etc/hosts
tmpfs 7.9G 0 7.9G 0% /proc/acpi
tmpfs 7.9G 0 7.9G 0% /proc/scsi
tmpfs 7.9G 0 7.9G 0% /sys/firmware
# cal
May 2021
Su Mo Tu We Th Fr Sa
1
2 3 [7m 4[27m 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest 62d49f9bab67 2 weeks ago 133MB
centos latest 300e315adb2f 4 months ago 209MB
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dad7c57e2199 centos "/bin/bash" 46 seconds ago Up 41 seconds happy_wilbur
c24522a85ec0 nginx "/docker-entrypoint.…" 5 minutes ago Up 5 minutes 80/tcp strange_yonath
NAME="CentOS Linux"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
Linux dad7c57e2199 5.4.0-67-generic #75~18.04.1-Ubuntu SMP Tue Feb 23 19:17:50 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Linux
# docker exec -it dad7 uname m
x86_64
# docker exec -it dad7 uname -r
5.4.0-67-generic
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dad7c57e2199 centos "/bin/bash" 2 minutes ago Up About a minute happy_wilbur
c24522a85ec0 nginx "/docker-entrypoint.…" 6 minutes ago Up 6 minutes 80/tcp strange_yonath
Will stop the containers and remove them next
/var/www/htmlroot@u22942380:/var/www/html# echo " [KI do not need them, just was a simple test"
I do not need them, just was a simple test
# docker stop dad c24
dad
c24
dad
c24
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx latest 62d49f9bab67 2 weeks ago 133MB
centos latest 300e315adb2f 4 months ago 209MB
# echo "Now the containers are removed, I will remove the images"
Now the containers are removed, I will remove the images
Untagged: nginx:latest
Untagged: nginx@sha256:75a55d33ecc73c2a242450a9f1cc858499d468f077ea942867e662c247b5e412
Deleted: sha256:62d49f9bab67f7c70ac3395855bf01389eb3175b374e621f6f191bf31b54cd5b
Deleted: sha256:3444fb58dc9e8338f6da71c1040e8ff532f25fab497312f95dcee0f756788a84
Deleted: sha256:f85cfdc7ca97d8856cd4fa916053084e2e31c7e53ed169577cef5cb1b8169ccb
Deleted: sha256:704bf100d7f16255a2bc92e925f7007eef0bd3947af4b860a38aaffc3f992eae
Deleted: sha256:d5955c2e658d1432abb023d7d6d1128b0aa12481b976de7cbde4c7a31310f29b
Deleted: sha256:11126fda59f7f4bf9bf08b9d24c9ea45a1194f3d61ae2a96af744c97eae71cbf
Deleted: sha256:7e718b9c0c8c2e6420fe9c4d1d551088e314fe923dce4b2caf75891d82fb227d
Untagged: centos:latest
Untagged: centos@sha256:5528e8b1b1719d34604c87e11dcd1c0a20bedf46e83b5632cdeac91b8c04efc1
Deleted: sha256:300e315adb2f96afe5f0b2780b87f28ae95231fe3bdd1e16b9ba606307728f55
Deleted: sha256:2653d992f4ef2bfd27f94db643815aa567240c37732cae1405ad1c1309ee9859
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
REPOSITORY TAG IMAGE ID CREATED SIZE
# echo "All the images are also cleaned up"
All the images are also cleaned up
# docker network ls
NETWORK ID NAME DRIVER SCOPE
b030abf5fdff bridge bridge local
3cca29eeefe3 host host local
00d911a73b54 none null local
# systemctl status docker
docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; disabled; vendor preset: enabled)
Active: inactive (dead) since Tue 2021-05-04 03:37:36 EDT; 5s ago
Docs: https://docs.docker.com
Process: 19422 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (c
Main PID: 19422 (code=exited, status=0/SUCCESS)
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.184183443-04:00" level=info msg
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.397696657-04:00" level=info msg
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.405438645-04:00" level=info msg
May 04 03:32:20 u22942380 dockerd[19422]: time="2021-05-04T03:32:20.511263047-04:00" level=info msg
May 04 03:32:20 u22942380 systemd[1]: Started Docker Application Container Engine.
May 04 03:37:36 u22942380 systemd[1]: Stopping Docker Application Container Engine...
May 04 03:37:36 u22942380 dockerd[19422]: time="2021-05-04T03:37:36.953514056-04:00" level=info msg
May 04 03:37:36 u22942380 dockerd[19422]: time="2021-05-04T03:37:36.954729357-04:00" level=info msg
May 04 03:37:36 u22942380 dockerd[19422]: time="2021-05-04T03:37:36.955339946-04:00" level=info msg
May 04 03:37:36 u22942380 systemd[1]: Stopped Docker Application Container Engine.
Please click on " man docker " to see the Manual Page for this command.
