RedHat/CentOS Atomic Images

sucking redhat’s balls

Requirements

We don’t really need the Redhat containers, as we build our own just fine. However for the reference here’s some left-over documentation on that front.

Fetch/upload those to Docker host or Atomic Host

cd ~/images/

wget https://access.redhat.com/webassets/avalon/d/Red_Hat_Enterprise_Linux_Atomic_Host-7-Getting_Started_Guide-en-US/files/mariadb_cont_2.tgz

wget https://access.redhat.com/webassets/avalon/d/Red_Hat_Enterprise_Linux_Atomic_Host-7-Getting_Started_Guide-en-US/files/web_cont_3.tgz

NOTE you might otherwise grab the CentOS equivalent

docker pull centos/mariadb

Image building

Tune the Dockerfile (remove RHEL specific shit) and build the images

Build the database image

mkdir centosdb/
tar xzf mariadb_cont_2.tgz -C centosdb/
cd centosdb/
vi Dockerfile

FROM centos:latest
RUN yum update -y
#RUN yum-config-manager...
RUN yum -y install net-tools mariadb-server

docker build -t centosdb ./

Build the web server image

mkdir centosweb/
tar xzf web_cont_3.tgz -C centosweb/
cd centosweb/
vi Dockerfile

FROM centos:latest
RUN yum -y install deltarpm yum-utils
#RUN yum-config-manager...
RUN yum install httpd procps-ng MySQL-python -y

also write down the IP address of the docker0 interface and tune the SQL connector accordingly

ifconfig docker0

vi action
con = mdb.connect(os.getenv('DB_SERVICE_SERVICE_HOST','172.17.0.1'), 'dbuser1', 'redhat', 'gss')

docker build -t centosweb ./

Ready to go

docker run -d -p 3306:3306 --name=centosdb1 centosdb
docker run -d -p 80:80 --name=centosweb1 centosweb

Acceptance

check that the db service responds

nc -v 172.17.0.1 3306

check that the web server works

nc -v localhost 80
curl http://localhost/index.html
check that the application works,
curl http://localhost/cgi-bin/action

Resources

RED HAT ENTERPRISE LINUX ATOMIC HOST 7 GETTING STARTED WITH CONTAINERS https://access.redhat.com/documentation/en/red-hat-enterprise-linux-atomic-host/version-7/getting-started-with-containers/

7.2 RELEASE NOTES https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/7.2_Release_Notes/index.html#pref-Release_Notes-Preface

CHAPTER 17. ATOMIC HOST AND CONTAINERS https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/7.2_Release_Notes/index.html#atomic_host_and_containers

CHAPTER 27. ATOMIC HOST AND CONTAINERS https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/7.2_Release_Notes/index.html#technology-preview-atomic_host_and_containers

CHAPTER 42. ATOMIC HOST AND CONTAINERS https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/7.2_Release_Notes/index.html#known-issues-atomic_host_and_containers

7.4. USING DOCKER ON RED HAT ENTERPRISE LINUX 7 https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.0_Release_Notes/sect-Red_Hat_Enterprise_Linux-7.0_Release_Notes-Linux_Containers_with_Docker_Format-Using_Docker.html


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