I am going to describe how to install docker & explain those necessary command.
Step 1: First of all we need to update our os with the latest packages.
Run:
sudo apt-get update
Key points:
sudo − The sudo command is used to ensure that the command runs with root access.
apt-get - update the OS with the latest packages from the Internet on to the Linux system.
update − The update option is used ensure that all packages are updated on the Linux system.
Step 2: Now time to add some certificates & transfer protocols, it will be required to work with the Docker site later on to download the necessary Docker packages.
Run:
sudo apt-get install apt-transport-https ca-certificates
Key points:
apt-transport-https - https download transport for APT. This package enables the usage of 'deb https://foo distro main' lines. in the /etc/apt/sources.list so that all package managers using the. libapt-pkg library can access metadata and packages available in sources. accessible over https (Hypertext Transfer Protocol Secure).
ca-certificates - It is a digital certificate that is used to verify the identity of 3rd parties, and encrypt data between you and said 3rd party.
Run:
sudo apt-key adv \ --keyserver hkp://ha.pool.sks-keyservers.net:80 \ --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
Key points:
The following command will download the key with the ID 58118E89F3A912897C070ADBF76221
Verify that you now have the key with the fingerprint
9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88, by searching for the last 8 characters of the fingerprint.
Run:
sudo apt-key fingerprint 0EBFCD88
Returns as:
pub 4096R/0EBFCD88 2017-02-22
Key fingerprint = 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88
uid Docker Release (CE deb) <docker@docker.com>
sub 4096R/F273FCD8 2017-02-22
Run:
sudo add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"
Use the following command to set up the stable repository. You always need the stable repository, even if you want to install builds from the edge or test repositories as well. To add the edge or test repository, add the word edge or test (or both) after the word stable in the commands below.
Note: The lsb_release -cs sub-command below returns the name of your Ubuntu distribution, such as xenial. Sometimes, in a distribution like Linux Mint, you might need to change $(lsb_release -cs) to your parent Ubuntu distribution. For example, if you are using Linux Mint Rafaela, you could use trusty.
apt package index.
Update packages:
sudo apt-get update
Step 6: Install the latest version of Docker CE
Run:
sudo apt-get install docker-ce
Alternative:
(If you want to install a certain version of docker ce then list that available versions in the repo, then select and install:
Listing version madison version of docker ce:
Run:
apt-cache madison docker-ce
To run each command of docker without 'sudo' docker will throw an error like:
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.27/containers/json: dial unix /var/run/docker.sock: connect: permission denied
Solution:
The error message tells you that your current user can’t access the docker engine, because you’re lacking permissions to access the unix socket to communicate with the engine.
As a temporary solution, you can use sudo to run the failed command as root.
However it is recommended to fix the issue by adding the current user to the docker group:
Run this command in your favourite shell and then completely log out of your account and log back in (if in doubt, reboot!):
Run:
sudo usermod -a -G docker $USER
Reboot your pc to ensure commands are running with right permission.
Testing Step:
To test docker is running perfectly or not, Run:
docker --version
More testing, Run a container:
sudo docker run hello-world
It will for look in local if that repo is available in local or not, if not it will download it from docker hub & you are all set to go with docker! :D
Sources:
