How to run Jenkins in docker container on Ubuntu 18.04

Overview

OS Ubuntu 18.04
Docker needs to be installed on the system

Run Jenkins as docker container:

Install docker on the system:
```
sudo apt install -y docker.io
```
Add your current user to the docker group:
```
sudo usermod -aG docker [username]
```
Exit and log back into the server and check the current user's groups:
```
groups
```
Create Jenkins docker network:
```
docker network create jenkins
```

Create docker volume for Jenkins certs:

docker volume create jenkins-docker-certs

Create docker volume for Jenkins data:
```
docker volume create jenkins-data
```

Run docker container that manages certs:

docker container run --name jenkins-docker --rm --detach \
--privileged --network jenkins --network-alias docker \
--env DOCKER_TLS_CERTDIR=/certs \
--volume jenkins-docker-certs:/certs/client \
--volume jenkins-data:/var/jenkins_home \
--publish 2376:2376 docker:dind

Run docker container with Blue Ocean plugin:

docker container run --name jenkins-blueocean --rm --detach \
--network jenkins --env DOCKER_HOST=tcp://docker:2376 \
--env DOCKER_CERT_PATH=/certs/client --env DOCKER_TLS_VERIFY=1 \
--volume jenkins-data:/var/jenkins_home \
--volume jenkins-docker-certs:/certs/client:ro \
--publish 8080:8080 --publish 50000:50000 jenkinsci/blueocean

Check if containers are up and running:
```
docker ps
```
Verify that Jenkins dashboard is up and running. Go to the URL address of the Jenkins server [jenkins_server_url]:8080:
To unlock the Jenkins, get the password from UI (Blue Ocean) container:
```
docker logs jenkins-blueocean
```