Replace Flannel with Weave Net in Kubernetes


The major reason that I replaced Flannel with Weave Net as the Kubernetes CNI is that Flannel does not support multicast. I did not realize it until my test Confluence DC cluster became dysfunctional. There are two Confluence nodes in the Confluence DC cluster. Each one is a pod, they are working fine when they … Continue reading Replace Flannel with Weave Net in Kubernetes

Use Glusterfs for Dynamic Volume Provisioning in Kubernetes


I recently setup a single node Kubernetes cluster on-premise for testing Jira and Confluence Data Center (which I will write a seperate blog later). In this blog, I want to share how I use Glusterfs as the shared storage which supports dynamic volume provisioning. Traditionally, to use persistent volume (PV) in a pod, you have … Continue reading Use Glusterfs for Dynamic Volume Provisioning in Kubernetes

Creating new Jira issues throws java.lang.NullPointerException


If you get the java.lang.NullPointerException error page as above when you are trying to create a new issue, then most likely it has something to do with the Default Issue Type Scheme of your Jira. Follow the diagnoses steps in this knowledge base Jira server throws NullPointerException when creating new issues or changing project settings … Continue reading Creating new Jira issues throws java.lang.NullPointerException

Jira Backgroud re-index vs Foreground re-index


First of all, what I mean Foreground re-index is Lock Jira and rebuild index. Here is a quick comparison between Background and Foreground re-index. I have summaried a few take away for your reference: The best combination is Jira Data Center + foreground re-index. As you can see above foreground re-index is quicker and offers … Continue reading Jira Backgroud re-index vs Foreground re-index

Port Forwarding over AWS Session Manager


Continue with the Session Manager over PrivateLink, another good use case for session manager is port forwarding. Here is a quick demo: First, login into the EC2 instance with session manager to install a Apache server # Install Apachesudo yum -y install httpd # Start Apache web serversudo systemctl start httpd # Ensure port 80 … Continue reading Port Forwarding over AWS Session Manager