linux containers vs virtual machines

[prayagupa]

• https://docs.docker.com/engine/docker-overview/

• https://medium.freecodecamp.org/a-beginner-friendly-introduction-to-containers-vms-and-docker-79a9e3e119b

• Seattle meetup https://github.com/github/kube-service-exporter

• https://docs.tilt.dev/

• https://helm.sh/

rhel

Requires: container-selinux >= 2.9

[ec2-user@ip-172-0-0-248 ~]$ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: amazon-id, rhui-lb
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo

[ec2-user@ip-172-0-0-248 ~]$ sudo yum makecache fast
Loaded plugins: amazon-id, rhui-lb, search-disabled-repos
docker-ce-stable                                                                                                                | 3.5 kB  00:00:00     
rhui-REGION-client-config-server-7                                                                                              | 2.9 kB  00:00:00     
rhui-REGION-rhel-server-releases                                                                                                | 3.5 kB  00:00:00     
rhui-REGION-rhel-server-rh-common                                                                                               | 3.8 kB  00:00:00     
(1/2): docker-ce-stable/x86_64/primary_db                                                                                       |  25 kB  00:00:00     
(2/2): docker-ce-stable/x86_64/updateinfo                                                                                       |   55 B  00:00:00     
Metadata Cache Created

## I used following instead in 2019 :) not sure why did not work
[ec2-user@ip-30-0-0-23 ~]$ yum check-update
Docker CE Stable - x86_64                                                                                               16 kB/s |  17 kB     00:01    
Red Hat Update Infrastructure 3 Client Configuration Server 8                                                          0.0  B/s |   0  B     00:01    
Error: Failed to synchronize cache for repo 'rhui-client-config-server-8'


[ec2-user@ip-172-0-0-248 ~]$ sudo yum -y install docker-ce
Loaded plugins: amazon-id, rhui-lb, search-disabled-repos
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 3:18.09.3-3.el7 will be installed
--> Processing Dependency: container-selinux >= 2.9 for package: 3:docker-ce-18.09.3-3.el7.x86_64
--> Processing Dependency: containerd.io >= 1.2.2-3 for package: 3:docker-ce-18.09.3-3.el7.x86_64
--> Processing Dependency: docker-ce-cli for package: 3:docker-ce-18.09.3-3.el7.x86_64
--> Running transaction check
---> Package containerd.io.x86_64 0:1.2.4-3.1.el7 will be installed
---> Package docker-ce.x86_64 3:18.09.3-3.el7 will be installed
--> Processing Dependency: container-selinux >= 2.9 for package: 3:docker-ce-18.09.3-3.el7.x86_64
---> Package docker-ce-cli.x86_64 1:18.09.3-3.el7 will be installed
--> Finished Dependency Resolution
Error: Package: 3:docker-ce-18.09.3-3.el7.x86_64 (docker-ce-stable)
           Requires: container-selinux >= 2.9
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

[ec2-user@ip-172-0-0-248 ~]$ sudo systemctl start docker
Failed to start docker.service: Unit not found.

[ec2-user@ip-172-0-0-248 ~]$ sudo yum info container-selinux
Loaded plugins: amazon-id, product-id, rhui-lb, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Error: No matching Packages to list

fix:

sudo yum -y install http://vault.centos.org/centos/7.3.1611/extras/x86_64/Packages/container-selinux-2.9-4.el7.noarch.rpm

[prayagupa]

docker run -e SPRING_PROFILES_ACTIVE=dev -it platform-service:v1.0-SNAPSHOT