Most used Docker Commands
Check the version of the installed docker version.
$ **docker --version**
Docker version 18.09.7, build 2d0083d
$ **docker -v**
Docker version 18.09.7, build 2d0083d
Check the running containers:
$ **docker ps**
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Check the available images:
$ **docker images**
REPOSITORY TAG IMAGE ID CREATED SIZE
redis latest 857c4ab5f029 10 months ago 98.2MB
weaveworks/scope 1.11.4 a082d48f0b39 10 months ago 78.5MB
ubuntu latest 3556258649b2 11 months ago 64.2MB
alpine latest b7b28af77ffe 11 months ago 5.58MB
Run a container using the redis image
$ **docker run redis**
1:C 21 Jun 2020 18:12:08.070 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
1:C 21 Jun 2020 18:12:08.070 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=1, just started
1:C 21 Jun 2020 18:12:08.070 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
1:M 21 Jun 2020 18:12:08.072 * Running mode=standalone, port=6379.
1:M 21 Jun 2020 18:12:08.072 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
1:M 21 Jun 2020 18:12:08.072 # Server initialized
1:M 21 Jun 2020 18:12:08.072 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
1:M 21 Jun 2020 18:12:08.072 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted afterTHP is disabled.
1:M 21 Jun 2020 18:12:08.072 * Ready to accept connections
Stop the container using Ctrl+C
Run a container using the redis image in background named redis-app
$ **docker run -d --name redis-app redis**
3749e501b0d591889b1867b2e8a17e17ccf2797a493f475092088f10a83ba957
Stop the container using the name
$ **docker ps**
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3749e501b0d5 redis "docker-entrypoint.s…" 31 seconds ago Up 30 seconds 6379/tcp redis-app
$ docker stop redis-app
redis-app
You can also stop the container by its ID also.
docker stop ID
ID doesn’t need to be required to be complete. The first few unique characters are also enough as ID.
$ **docker ps**
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
67cef909310c redis "docker-entrypoint.s…" 8 seconds ago Up 6 seconds 6379/tcp dreamy_lalande
$ **docker stop 6**
6
List all the containers running and stopped.
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
67cef909310c redis "docker-entrypoint.s…" About a minute ago Exited (0) 53 seconds ago dreamy_lalande
3749e501b0d5 redis "docker-entrypoint.s…" 6 minutes ago Exited (0) 5 minutes ago redis-app
Remove stopped container by NAME or ID
$ docker rm redis-app
redis-app
$ docker rm 6
6
List all the images available in local repository
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
redis latest 857c4ab5f029 10 months ago 98.2MB
weaveworks/scope 1.11.4 a082d48f0b39 10 months ago 78.5MB
ubuntu latest 3556258649b2 11 months ago 64.2MB
alpine latest b7b28af77ffe 11 months ago 5.58MB
Pull an image busybox from docker hub
$ docker pull busybox
Using default tag: latest
latest: Pulling from library/busybox
76df9210b28c: Pull complete
Digest: sha256:95cf004f559831017cdf4628aaf1bb30133677be8702a8c5f2994629f637a209
Status: Downloaded newer image for busybox:latest
Delete the image busybox
$ docker rmi busybox
Untagged: busybox:latest
Untagged: busybox@sha256:95cf004f559831017cdf4628aaf1bb30133677be8702a8c5f2994629f637a209
Deleted: sha256:1c35c441208254cb7c3844ba95a96485388cef9ccc0646d562c7fc026e04c807
Deleted: sha256:1be74353c3d0fd55fb5638a52953e6f1bc441e5b1710921db9ec2aa202725569
Try all these scenario based tutorial on interactive UI:
Docker Basic Commands Scenario | ashusharma | Katacoda
To add new scenarios, please raise a pull request on repository:
ashusharmatech/katacoda-scenarios
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