Docker Inside Docker
Docker :- Docker is an open platform for developing, shipping, and running applications. Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. With Docker, you can manage your infrastructure in the same ways you manage your applications.
The basic docker run command takes this form:
[root@localhost ~]# docker run –it –-name abhay centos:latest
The — privileged flag gives all capabilities to the container, and it also lifts all the limitations enforced by the device cgroup controller. In other words, the container can then do almost everything that the host can do. This flag exists to allow special use-cases, like running Docker within Docker.
# docker run –it –name abhay1 –privileged indocker:v1
and then install and set the repo
Install the yum-utils package (which provides the yum-config-manager utility)
and set up the stable repository.
#yum install –y yum-utils
after that we have to go with langpack , becuase directly configuring and adding repo of docker will give us the suitable error : given below
What does Langpacks do.?
Langpacks are meta-packages which install extra add-on packages containing translations, dictionaries and locales for every package installed on the system.
On a Red Hat Enterprise Linux 8 system, langpacks installation is based on the language meta-packages and RPM weak dependencies (Supplements tag).
If you installed glibc-langpack-<locale_code> for one or more selected languages, you can delete glibc-all-langpacks after the installation to save the disk space.
Note that installing only selected glibc-langpack-<locale_code> packages instead of glibc-all-langpacks has impact on run time performance.
And then add repo file : yum-config-manager \ — add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
and install the docker using
#yum install docker-ce
So successfully installed docker .!!
So if you want to run docker command in docker container , please follow the below lines:
So we introduce an command called dockerd .!!
“ dockerd “ — is the persistent process that manages containers. Docker uses
different binaries for the daemon and client. To run the daemon u
type “dockerd”.
#dockerd
The docker run command can be used in combination with docker commit to
change the command that a container runs
To run the daemon with debug output, then use this command :
# dockerd &
So after that you can run the docker commands like
#docker info
#docker ps
So finally we can run docker inside a docker
#docker-in-docker
I hope you like it
Thank you
— Abhay
