- Installing Docker
- Docker: Basic commands
- Creating the Dockerfile
- Listing the Docker image
- Login on Dockerhub
- Pushing the Docker image
- Before you get started, please make sure you have Docker installed on your machine:
curl -fsSl https://get.docker.com
1.1. Make sure Docker service is running state:
docker-tutorialz]# systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: active (running) since Qua 2022-01-26 22:49:42 -03; 7min ago
Docs: https://docs.docker.com
Main PID: 4627 (dockerd)
CGroup: /system.slice/docker.service
└─4627 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
Jan 26 22:49:41 elliot01 dockerd[4627]: time="2022-01-26T22:49:41.146036873-03:00" level=info msg="Firewalld: interface docker_gwbridge already part of docke...returning"
Jan 26 22:49:42 elliot01 systemd[1]: Started Docker Application Container Engine.
Jan 26 22:49:42 elliot01 dockerd[4627]: time="2022-01-26T22:49:42.231763910-03:00" level=info msg="API listen on /var/run/docker.sock"
Hint: Some lines were ellipsized, use -l to show in full.
- Before we need test a container image to demonstrate a
docker container runcommand:
# docker container run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
2db29710123e: Pull complete
Digest: sha256:507ecde44b8eb741278274653120c2bf793b174c06ff4eaa672b713b3263477b
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/get-started/
1.1. List all Docker containers:
# docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@elliot01 docker-tutorialz]# docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ea850619834e hello-world "/hello" 2 minutes ago Exited (0) 2 minutes ago objective_haslett
ea3d6cba32ce nginx:latest "/docker-entrypoint.…" 2 months ago Exited (255) 6 weeks ago 80/tcp amaury.2.no71j9ujjjoj14u8bi62vqx5y
79151c794c62 nginx:latest "/docker-entrypoint.…" 2 months ago Exited (255) 6 weeks ago 80/tcp amaury.3.bkbp2ugc5xoh1fagt02ha6nso
73a12ad1f474 nginx:latest "/docker-entrypoint.…" 2 months ago Exited (255) 6 weeks ago 80/tcp amaury.1.tsmucyxcwftavjvy3vnzrcx40
2aaf276affba alpine:latest "ping 8.8.8.8" 2 months ago Dead eager_gates.2.pslfwckn3sc0gfl6mq5wrvy36
c00037dfdb53 nginx:latest "/docker-entrypoint.…" 2 months ago Exited (0) 2 months ago amaury.1.vqdl6rxuu0x30o6jchlh66iqt
1.2. Now another example about how you can set a name for the Docker container:
# docker container run --name amaury hello-world
1.3. Listing the containers:
# docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cead5b46cf1e hello-world "/hello" 5 seconds ago Exited (0) 3 seconds ago amaury
1.4. Other way to create a new Docker container using -ti option to interatic with container:
# docker container run -ti ubuntu bash
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
ea362f368469: Pull complete
Digest: sha256:b5a61709a9a44284d88fb12e5c48db0409cfad5b69d4ff8224077c57302df9cf
Status: Downloaded newer image for ubuntu:latest
root@804841b67ea6:/#
1.5. Creating a MongoDB container:
- before we need check the Dockerhub about MongoDB:
# docker container run -d -e MONGO_INITDB_ROOT_USERNAME=mongouser -e MONGO_INITDB_ROOT_PASSWORD=mongopwd mongo
2833a64a61b6637c77e4df70cdf2442ccd56b19dc1d63037307cb69497b2178a
1.6. Now we need access this container, you can do this below:
- port-bind (connection port with container, we need create a port-bind, get a local port of my machine and link with container port)
Options:
-d - execute container in background
-p - port-bind
-e - environment variables
- Running the command again using more options:
# docker container run -d -p 27017:27017 -e MONGO_INITDB_ROOT_USERNAME=mongouser -e MONGO_INITDB_ROOT_PASSWORD=mongopwd mongo
99d012a1ceb7ed598230fd4a11efb3c05d6404c61a1503c32d3a3ab7245bc8bb
- Listing the container:
# docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
99d012a1ceb7 mongo "docker-entrypoint.s…" 26 seconds ago Up 23 seconds 0.0.0.0:27017->27017/tcp, :::27017->27017/tcp elated_hawking
1.1. Now we will work using Docker images befores some concepts to start:
- Container image: basically a template for our container
- How to buid your Docker image? There are two ways to buid:
- Docker commit (image created via container - wrong way to create - several disvantages)
- Dockerfile (file to add a image following basic steps, seems a cake recipe)
1.2. Let's create our first Dockerfile using a nginx image from Dockerhub:
- First of all, check on Dockerhub the nginx image.
1.3. Let's create our Dockerfile as follow below:
FROM nginx:latest
RUN echo '<h1>Hello world!</h1>' > /usr/share/nginx/html/index.html1.4. Let's create our Docker image based on Dockerfile:
# docker build -t amauryborgesouza/nginx-app:v1 .
Sending build context to Docker daemon 2.048kB
Step 1/2 : FROM nginx:latest
latest: Pulling from library/nginx
5eb5b503b376: Pull complete
1ae07ab881bd: Pull complete
78091884b7be: Pull complete
091c283c6a66: Pull complete
55de5851019b: Pull complete
b559bad762be: Pull complete
Digest: sha256:2834dc507516af02784808c5f48b7cbe38b8ed5d0f4837f16e78d00deb7e7767
Status: Downloaded newer image for nginx:latest
---> c316d5a335a5
Step 2/2 : RUN echo '<h1>Hello world!</h1>' > /usr/share/nginx/html/index.html
---> Running in 088afc5ddbc9
Removing intermediate container 088afc5ddbc9
---> 8df1149ce9b1
Successfully built 8df1149ce9b1
Successfully tagged amauryborgesouza/nginx-app:v1
# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
amauryborgesouza/nginx-app v1 8df1149ce9b1 4 hours ago 141MB
<none> <none> 1ba2d87012b8 7 hours ago 993MB
node latest e6bed6a65a54 16 hours ago 993MB
nginx latest c316d5a335a5 32 hours ago 141MB
mongo latest ee13a1eacac9 2 weeks ago 696MB
ubuntu latest d13c942271d6 2 weeks ago 72.8MB
fedora latest b78af7a83692 8 weeks ago 153MB
nginx <none> 87a94228f133 3 months ago 133MB
hello-world latest feb5d9fea6a5 4 months ago 13.3kB
alpine <none> 14119a10abf4 5 months ago 5.59MB
Now we need authenticate on Dockerhub to push the Docker image:
# docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: amaury
Password:
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
Let's push the image for Dockerhub:
# docker push amauryborgesouza/nginx-app:v1
The push refers to repository [docker.io/amauryborgesouza/nginx-app]
016d6b295812: Pushed
762b147902c0: Mounted from library/nginx
235e04e3592a: Mounted from library/nginx
6173b6fa63db: Mounted from library/nginx
9a94c4a55fe4: Mounted from library/nginx
9a3a6af98e18: Mounted from library/nginx
7d0ebbe3f5d2: Mounted from library/nginx
v1: digest: sha256:1fb2cd964f3b31cb8edea42a46ab4b5c20e937e1b68fbe218d0258b273d868c6 size: 1777
ssasas
# docker container run -d -p 81:80 amauryborgesouza/nginx-app:v1
9e918c0c25ebd123fff2903fc339602dd4e6b95968bb8ba2bad9b2c664d3ea63
- On the browser type your IP address:
