In this lab you will learn how to install Cockpit; which can be seen as the "Administration Page" for OpenShift. It contains tools to manage your cluster plus a plugin for Kubernetes.
NOTE: This lab REQUIRES that you have the root login enabled with a password. If you are on a cloud installation or if you would rather not use the root account; please see how to deploy Cockpit as a container.
You will need to install the proper packages on all servers taking part of the cluster (including the master). You can do this leverging ansible.
ansible all -m shell -a "yum -y install cockpit-*"
Enable the cockpit.socket to start up the webui. Do this on the master only.
systemctl enable cockpit.socket
Navigate to your master on port 9090 (for example; mine was https://master.example.com:9090) on your web browser. It should look something like this.
Here you need to login as root. Once you have logged in, click on the "Dashboard" tab to see the overview page.
On this page you want to add the rest of your cluster using the blue "+" sign. On the commandline; list the servers that are part of your cluster.
oc get nodes
NAME STATUS AGE
master.example.com Ready 47d
node1.example.com Ready 47d
node2.example.com Ready 47d
Add these one by one (if you have SSH keys set up; no password is needed!). In the end it should look like this.
If you click on the "Cluster" tab you will see information about your OpenShift cluster.
Feel free to click around! See how you can leverage this interface. Some of the things you can do is
- See everyones project and containers
- Login to anyones containers for troubleshooting
- See system logs
- Manage Volumes
- View memory, cpu, disk, and network information
- Terminal into any server in the cluster
- View the OpenShift topology
In this lab you learned how to install cockpit and enable the service socket. You also learned how to login to the web interface and add additional nodes you want to monitor.