1. Calico 1.1 BIRD is not ready 1 kubectl -n kube-system get pod calico-node-xxx stays at 0/1 and never comes up, reporting calico/node is not ready: BIRD is not ready: BGP not established with Solution: Calico uses first-found by default, meaning it takes the NodeIP from the first NIC it finds.

1. How to Access a Remote Cluster Locally During development, you often need to connect directly to a remote Kubernetes cluster. The usual approach is to copy /etc/kubernetes/admin.conf to your local ~/.kube/kubeconfig. But the kubeconfig’s server address is kubernetes.default.svc. So we need to configure a hosts entry: 1 1.1.1.1 kubernetes.default.svc If you need to switch between different clusters, you not only have to swap the kubeconfig but also modify hosts.

The Prometheus community moves so fast that some of the documents I wrote earlier have become outdated. I’ve recently started paying attention to observability again, filling in some of the gaps in my operations knowledge. 1. Terminology Grafana A visualization tool that provides a variety of visualization panels and supports many data sources, including Prometheus, OpenTSDB, MySQL, and others.

1. Background Many build nodes were added to Jenkins using the same Label for pipelines to use, but Jenkins tends to run builds on the same node every time. This leads to concurrency problems: a single node is overloaded while other nodes sit idle, so the load is extremely unbalanced.

1. Comparing a Few Common Gateways Nginx, a reverse proxy with a modular design, written in C OpenResty, a web development platform built around Nginx that can parse and execute Lua scripts Kong, an application on top of OpenResty, an API gateway with API management and request proxying, using PostgreSQL for storage APISIX, which replaces Kong’s PostgreSQL with Etcd and is built on Nginx’s core libraries APISIX’s advantage lies in the API management and extensibility it provides, so the gateway no longer merely forwards traffic to services but can be configured and customized.