If no tag is provided, Docker Engine uses the :latest tag as a default. This command pulls the debian:latest image:
docker pull redis
Displaying Docker Images
AsafsMacBook:~ aahmadov$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest 46331d942d63 2 months ago 9.14kB
redis latest 23d787aaa419 2 months ago 107MB
docker/getting-started latest adfdb308d623 3 months ago 27.4MB
Run a command in a new container
AsafsMacBook:~ aahmadov$ docker run redis
1:C 28 May 2022 04:26:22.809 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
1:C 28 May 2022 04:26:22.809 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started
1:C 28 May 2022 04:26:22.809 # 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 28 May 2022 04:26:22.809 * monotonic clock: POSIX clock_gettime
1:M 28 May 2022 04:26:22.811 * Running mode=standalone, port=6379.
1:M 28 May 2022 04:26:22.811 # Server initialized
1:M 28 May 2022 04:26:22.812 * Ready to accept connections
List containers
AsafsMacBook:~ aahmadov$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4683ec9514aa redis "docker-entrypoint.s…" About a minute ago Up About a minute 6379/tcp serene_galois
OMLF4D4887B80A5:~ aahmadov$
The docker ps command only shows running containers by default. To see all containers, use the -a (or --all) flag:
AsafsMacBook:~ aahmadov$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b7421b65d01a redis:4.0 "docker-entrypoint.s…" 6 minutes ago Up 6 minutes 6379/tcp quizzical_wilson
9e0452128f10 redis:latest "docker-entrypoint.s…" 6 minutes ago Up 6 minutes 6379/tcp strange_jones
98b3dd2527ac hello-world "/hello" 2 months ago Exited (0) 2 months ago gracious_shirley
1e606fd2c79b docker/getting-started "/docker-entrypoint.…" 2 months ago Created stoic_kilby
Stop and Start container
AsafsMacBook:~ aahmadov$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7e6fb58a6255 redis "docker-entrypoint.s…" 24 seconds ago Up 23 seconds 6379/tcp vigilant_lalande
AsafsMacBook:~ aahmadov$ docker stop 7e6fb58a6255 [Container ID]
7e6fb58a6255
AsafsMacBook:~ aahmadov$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
AsafsMacBook:~ aahmadov$ docker start 7e6fb58a6255
Docker detached mode
We use Docker detached mode (-d) when we want to connect to the container in an interactive mode or we can say when we just want application to be running inside the container. This means, we can start up the container and could use the console after startup for other commands.
It runs the container in the background of your terminal. It does not receive input or display output.
AsafsMacBook:~ aahmadov$ docker run -d redis
Download and run different version of images
AsafsMacBook:~ aahmadov$ docker pull redis:4.0
4.0: Pulling from library/redis
bdc84a41f251: Pull complete
698d3e76f19f: Pull complete
ac4bbea6248c: Pull complete
2aeaea3e9c04: Pull complete
6fb4291f955c: Pull complete
14ae5d3407b5: Pull complete
Digest: sha256:2e03fdd159f4a08d2165ca1c92adde438ae4e3e6b0f74322ce013a78ee81c88d
Status: Downloaded newer image for redis:4.0
docker.io/library/redis:4.0
AsafsMacBook:~ aahmadov$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest 46331d942d63 2 months ago 9.14kB
redis latest 23d787aaa419 2 months ago 107MB
docker/getting-started latest adfdb308d623 3 months ago 27.4MB
redis 4.0 7a8c2384752f 2 years ago 83.5MB
AsafsMacBook:~ aahmadov$ docker run -d redis:latest
9e0452128f1068aef41bba90529221631789d8728aae8b05272c63e141ab8790
AsafsMacBook:~ aahmadov$ docker run -d redis:4.0
b7421b65d01a422cea68b7ee8073658af4822659591e15d142b5c6a4fce8f116
AsafsMacBook:~ aahmadov$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b7421b65d01a redis:4.0 "docker-entrypoint.s…" 5 seconds ago Up 5 seconds 6379/tcp quizzical_wilson
9e0452128f10 redis:latest "docker-entrypoint.s…" 11 seconds ago Up 10 seconds 6379/tcp strange_jones
Example – install and configure Jenkins container
I will use pull command to download the Jenkins Image into the local Ubuntu server.
AsafsMacBook:~ aahmadov$ docker pull jenkins
To understand what ports are exposed by the container, we should use the Docker inspect command to inspect the image. This method allows one to return low-level information on the container or image.(JSON format)
AsafsMacBook:~ aahmadov$ docker inspect jenkins
To run Jenkins and map the ports, you need to change the Docker run command and add the ‘p’ option, which specifies the port mapping. So, I need to run the following command :
AsafsMacBook:~ aahmadov$ docker run -p 8080:8080 -p 50000:50000 jenkins
The left-handside of the port number mapping is the Docker host port to map to, and the right-hand side is the Docker container port number.
When i open the browser and navigate to the Docker host on port 8080, you will see Jenkins up and running.
