Use Ansible to install Openshift Origin (oc) single node cluster on number of machines!

OpenshiftOrigin.md

Install OpenShift Origin on one node (CENTOS) - commands:

1) Install docker

yum install docker -y 
systemctl start docker

Note:

echo "INSECURE_REGISTRY='--insecure-registry 172.30.0.0/16'" >> /etc/sysconfig/docker
systemctl enable docker
systemctl start  docker

2) Get Openshift and put it in class path

mkdir ~/1sarvani && cd 1sarvani
wget https://github.com/openshift/origin/releases/download/v1.5.0/openshift-origin-client-tools-v1.5.0-031cbe4-linux-64bit.tar.gz
tar -xvzf openshift-origin-client-tools-v1.5.0-031cbe4-linux-64bit.tar.gz
mv openshift-origin-client-tools-v1.5.0-031cbe4-linux-64bit/* /usr/local/bin/

3) start OC cluster oc cluster up OR

oc cluster up \
                --image-streams=rhel7 \
                --host-pv-dir='/root/host-pv' \
                --host-volumes-dir='/root/host-volumes' \
                --host-data-dir='/root/host-etcd-data' \
                --host-config-dir='/root/host-config' \
                --use-existing-config

Now, to do the same using Ansible:

https://github.com/kuchibs/osetraintsk.git

Troubleshooting:

• When OSE installation throws error: config.yml --> {"failed": true, "msg": "Failed to query Docker API. Is docker running on this host?"} However, you have docker installed and is running!

• Solution : we need docker-ce and not docker or docker-ee

    sudo systemctl stop docker
    sudo yum -y remove docker
    sudo yum remove container-selinux-2.33-1.git86f33cd.el7.noarch
    sudo yum-config-manager -y --add-repo https://download.docker.com/linux/centos/docker-ce.repo
    sudo yum install -y --setopt=obsoletes=0   docker-ce-17.03.1.ce-1.el7.centos   docker-ce-selinux-17.03.1.ce-1.el7.centos
    sudo mv  /var/lib/docker/devicemapper/ /tmp
    systemctl status docker
    sudo systemctl start docker
    systemctl status docker

• More simpler solution In your hosts file, in the play, [OSEv3:vars] , add the line openshift_disable_check=disk_availability,docker_storage,memory_availability to disable the checks! OR Goto /openshift-ansible/playbooks/common/openshift-cluster/config.yml and inside - - action: openshift_health_check

 action: openshift_health_check
     args:
      checks:
      - disk_availability
      #- memory_availability
      - package_availability
      - package_version
      #- docker_image_availability
      #- docker_storage

Install OpenShift Origin on multiple nodes (CENTOS7.4)

Pre-reqs https://docs.openshift.org/latest/install_config/install/prerequisites.html#install-config-install-prerequisites Installting using ansible https://github.com/openshift/openshift-ansible

I am using the following: https://www.youtube.com/watch?v=wWSRpaosc-M https://docs.openshift.org/latest/install_config/install/host_preparation.html https://docs.openshift.org/latest/install_config/install/advanced_install.html#advanced-verifying-the-installation

• Step1) Create 3 vms. 1 master(m1), 2 nodes(n1,n2)
• Step2) Prepare the vms: - set hostname with fqdn m1.abc.com hostnamectl set-hostname m1.abc.com, cat /etc/sysconfig/network file should also have the same. - have '/etc/hosts' entry for m1, n1, n2 Example 10.131.173.146 m1 10.131.172.189 n1 10.131.173.147 n2
• Step3) Have 40Gb at /var partition. Assuming you have space and /var needs to be extended, follow the following:

--to extend file system
 df -Th
 lsblk
 lvextend -L +40G /dev/mapper/vg_root-var
 df -TH
 resize2fs /dev/mapper/vg_root-var
 df -TH
--

Else, add new disk, create partition, and then extend

• Step4) Now, time to prepare the host with prereq installs:

yum install -y epel-release docker ansible git
yum install -y wget git net-tools bind-utils iptables-services bridge-utils bash-completion kexec-tools sos psacct
echo "INSECURE_REGISTRY='--insecure-registry 172.30.0.0/16'" >> /etc/sysconfig/docker    #172.30.0.0/16 is the default value of the servicesSubnet variable in the master-config.yaml file
cat /etc/sysconfig/docker  #verify insecure reg