AKAI TSUKI

System development or Technical something

Try to prepare host for installation of OpenShift.

Docker OpenShift

ref:
https://docs.openshift.org/latest/install_config/install/host_preparation.html

Host list

Host Role
opshift01 master/node(infra)
opshift02 node(west)
opshift03 node(east)

Stop firewalld

at all node

[root@opshift01 ~]# systemctl stop firewalld
[root@opshift01 ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
[root@opshift01 ~]#

Install the following base packages:

at all node

# yum install wget git net-tools bind-utils iptables-services \
bridge-utils bash-completion kexec-tools sos psacct

Install Ansible

install at master node.

# yum -y install \
    https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
# sed -i -e "s/^enabled=1/enabled=0/" /etc/yum.repos.d/epel.repo
# yum -y --enablerepo=epel install ansible pyOpenSSL

try to confirm version

# ansible --version
ansible 2.3.1.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = Default w/o overrides
  python version = 2.7.5 (default, Nov  6 2016, 00:28:07) [GCC 4.8.5 20150623 (Red Hat 4.8.5-11)]
#

Get openshift-ansible

at master node.

# cd ~
# git clone https://github.com/openshift/openshift-ansible
Cloning into 'openshift-ansible'...
remote: Counting objects: 61775, done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 61775 (delta 6), reused 15 (delta 4), pack-reused 61754
Receiving objects: 100% (61775/61775), 16.03 MiB | 1.66 MiB/s, done.
Resolving deltas: 100% (37890/37890), done.
# cd openshift-ansible

Install docker

at all node.

# yum install docker

check version

# docker -v
Docker version 1.12.6, build 88a4867/1.12.6
#

configure /etc/sysconfig/docker file.

# cp -p /etc/sysconfig/docker{,.org}
# vi /etc/sysconfig/docker
# diff /etc/sysconfig/docker{,.org}
4c4
< OPTIONS='--selinux-enabled --insecure-registry 172.30.0.0/16 --log-driver=journald --signature-verification=false'
---
> OPTIONS='--selinux-enabled --log-driver=journald --signature-verification=false'
#

check physical volume and volume group for docker.
and ref. Create Physical volume in Linux CentOS - AKAI TSUKI

# pvs
  PV         VG          Fmt  Attr PSize  PFree
  /dev/sda2  cl          lvm2 a--  37.00g     0
  /dev/sda3  cl          lvm2 a--  15.00g     0
  /dev/sda4  docker-data lvm2 a--  27.00g 27.00g
# vgs
  VG          #PV #LV #SN Attr   VSize  VFree
  cl            2   2   0 wz--n- 51.99g     0
  docker-data   1   0   0 wz--n- 27.00g 27.00g
#

setting up docker storage

# cat <<EOF > /etc/sysconfig/docker-storage-setup
> VG=docker-data
> EOF
#

check this file.

# cat /etc/sysconfig/docker-storage-setup
VG=docker-data
#

run script

# docker-storage-setup
  Using default stripesize 64.00 KiB.
  Rounding up size to full physical extent 28.00 MiB
  Logical volume "docker-pool" created.
  Logical volume docker-data/docker-pool changed.
#

and check

# cat /etc/sysconfig/docker-storage
DOCKER_STORAGE_OPTIONS="--storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/docker--data-docker--pool --storage-opt dm.use_deferred_removal=true "
# lvs
  LV          VG          Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root        cl          -wi-ao---- 49.99g
  swap        cl          -wi-ao----  2.00g
  docker-pool docker-data twi-a-t--- 10.74g             0.00   0.14
#

start docker

# systemctl is-active docker
unknown
# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
# systemctl start docker
#