| package main | |
| import ( | |
| "github.com/prometheus/client_golang/prometheus" | |
| "github.com/prometheus/client_golang/prometheus/promhttp" | |
| "log" | |
| "math/rand" | |
| "net/http" | |
| "time" |
Free TDD Tutorial
Go, Containers, and the Linux Scheduler
https://www.riverphillips.dev/blog/go-cfs/
GOMAXPROCS should be set to the number of CPU cores that the container is allowed to use, if you’re allocating fractional CPU round down, unless you’re allocating less than 1 CPU core in which case round up. GOMAXPROCS=max(1, floor(CPUs)) can be used to calculate the value. If you find it easier Uber has open sourced a library automaxprocs to calculate this value for you from your container’s cgroups automatically.
| package main | |
| import ( | |
| "encoding/json" | |
| "flag" | |
| "io/ioutil" | |
| "log" | |
| "net" | |
| "os" | |
| "os/signal" |
https://serverfault.com/questions/1010342/nginx-using-resolver-in-a-stream
stream {
resolver 127.0.0.1 valid=1s;
# a hack to declare $server_us variable
map "" $server_us {
default server.foo.com:22222;
https://dave.cheney.net/2019/10/06/use-internal-packages-to-reduce-your-public-api-surface
For example, a package /a/b/c/internal/d/e/f can only be imported by code in the directory tree rooted at /a/b/c. It cannot be imported by code in /a/b/g or in any other repository.
bytes<->string without allocation. However, bytes can't be changed.
// StringToBytes converts string to byte slice without a memory allocation.
// The bytes must not be modified; doing so can cause
// the program to crash or behave unpredictably.
func StringToBytes(s string) []byte {
return unsafe.Slice(unsafe.StringData(s), len(s))
}
Kubebuilder does not exist as an example to copy-paste, but instead provides powerful libraries and tools to simplify building and publishing Kubernetes APIs from scratch. It provides a plugin architecture allowing users to take advantage of optional helpers and features.
Kubebuilder is developed on top of the controller-runtime and controller-tools libraries.
Kubebuilder is extensible and can be used as a library in other projects. Operator-SDK is a good example of a project that uses Kubebuilder as a library.
Sample controller: https://github.com/kubernetes/sample-controller