OpenShiftとは
Red Hat® OpenShift® はエンタープライズ対応の Kubernetes コンテナプラットフォームで、
ハイブリッドクラウドやマルチクラウドのデプロイメントを管理するフルスタックの自動運用機能を備えています。
- Red Hat OpenShift Online
- Red Hat OpenShift Container Platform
- OKD(Red Hat OpenShift Origin)
の種類があり、今回は無料で試せるOKDをVM上に展開したいと思います。
OS: CentOS7.6
メモリ: 12GB
構成
今回はお試しという事で、All-in-One構成という冗長構成なんて知ったもんか構成をしていきます。
prerequisites
firewallとIPv6を無効化します。
# systemctl disable firewalld; systemctl stop firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
# sed -i "s/GRUB_CMDLINE_LINUX=\"/GRUB_CMDLINE_LINUX=\"ipv6.disable=1 /" /etc/default/grub; grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-957.27.2.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-957.27.2.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-957.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-957.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-c8c205755449484dad7e313301fab377
Found initrd image: /boot/initramfs-0-rescue-c8c205755449484dad7e313301fab377.img
done
Install modules
必要なものをインストールしていきましょう。
# yum update
# yum install -y wget git net-tools bind-utils yum-utils iptables-services bridge-utils bash-completion kexec-tools sos psacct
# yum -y install epel-release
# yum -y --enablerepo=epel install ansible pyOpenSSL
# yum install -y docker
Install OpenShift
それでは、今回のメインのOpenShiftを入れていきましょう。
# git clone https://github.com/openshift/openshift-ansible
# cd openshift-ansible
# ls
BUILD.md HOOKS.md OWNERS README_CONTAINER_IMAGE.md docs images openshift-ansible.spec requirements.txt setup.cfg test tox.ini
CONTRIBUTING.md LICENSE README.md ansible.cfg hack inventory playbooks roles setup.py test-requirements.txt
# git checkout release-3.11
# ls
BUILD.md HOOKS.md README.md ansible.cfg examples inventory playbooks roles test
CONTRIBUTING.md LICENSE README_CONTAINERIZED_INSTALLATION.md conftest.py hack meta pytest.ini setup.cfg test-requirements.txt
DEPLOYMENT_TYPES.md OWNERS README_CONTAINER_IMAGE.md docs images openshift-ansible.spec requirements.txt setup.py tox.ini
git checkoutをした後、lsの結果が変わったことを確認しましょう。
そのあと、構成を確認していきます。
# ansible-playbook -i inventory/hosts.localhost playbooks/prerequisites.yml
このチェックが通ったら、デプロイしていきます。
# ansible-playbook -i inventory/hosts.localhost playbooks/deploy_cluster.yml
完了したら確認しましょう
# oc status
In project default on server https://openshift.mydom.local:8443
https://docker-registry-default.router.default.svc.cluster.local (passthrough) (svc/docker-registry)
dc/docker-registry deploys docker.io/openshift/origin-docker-registry:v3.11
deployment #1 deployed 15 minutes ago - 1 pod
svc/kubernetes - 172.30.0.1 ports 443->8443, 53->8053, 53->8053
https://registry-console-default.router.default.svc.cluster.local (passthrough) (svc/registry-console)
dc/registry-console deploys docker.io/cockpit/kubernetes:latest
deployment #1 deployed 15 minutes ago - 1 pod
svc/router - 172.30.138.12 ports 80, 443, 1936
dc/router deploys docker.io/openshift/origin-haproxy-router:v3.11
deployment #1 deployed 15 minutes ago - 1 pod
View details with 'oc describe <resource>/<name>' or list everything with 'oc get all'.
Node数はしっかり１です笑
oc get nodes
NAME STATUS ROLES AGE VERSION
openshift.mydom.local Ready compute,infra,master 1d v1.11.0+d4cacc0
get allでNode上で展開されているものすべてを見ていきましょう。
# oc get all
NAME READY STATUS RESTARTS AGE
pod/docker-registry-1-8mbmr 1/1 Running 0 15m
pod/registry-console-1-v7hxk 1/1 Running 0 15m
pod/router-1-8bwkf 1/1 Running 0 15m
NAME DESIRED CURRENT READY AGE
replicationcontroller/docker-registry-1 1 1 1 15m
replicationcontroller/registry-console-1 1 1 1 15m
replicationcontroller/router-1 1 1 1 15m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/docker-registry ClusterIP 172.30.29.106 <none> 5000/TCP 15m
service/kubernetes ClusterIP 172.30.0.1 <none> 443/TCP,53/UDP,53/TCP 18m
service/registry-console ClusterIP 172.30.47.210 <none> 9000/TCP 15m
service/router ClusterIP 172.30.138.12 <none> 80/TCP,443/TCP,1936/TCP 15m
NAME REVISION DESIRED CURRENT TRIGGERED BY
deploymentconfig.apps.openshift.io/docker-registry 1 1 1 config
deploymentconfig.apps.openshift.io/registry-console 1 1 1 config
deploymentconfig.apps.openshift.io/router 1 1 1 config
NAME HOST/PORT PATH SERVICES PORT TERMINATION WILDCARD
route.route.openshift.io/docker-registry docker-registry-default.router.default.svc.cluster.local docker-registry <all> passthrough None
route.route.openshift.io/registry-console registry-console-default.router.default.svc.cluster.local registry-console <all> passthrough None
下のコマンドの結果に記載されているURLにログインすることで、GUIに入れます。
user: developer
password :developer
oc login -u system:admin
Logged into "https://openshift.mydom.local:8443" as "system:admin" using existing credentials.
You have access to the following projects and can switch between them with 'oc project <projectname>':
* default
kube-public
kube-system
management-infra
openshift
openshift-infra
openshift-logging
openshift-monitoring
openshift-node
openshift-sdn
Using project "default".
