package main

import (
    "log"
    "time"
)

func init() {
    logFn := "/var/log/myServer/errors.log"
    rotationPeriod := 24 * time.Hour
    maxSize := 0
    retainCount := 7
    rotlog, err := logrotate.Open(logFn, rotationPeriod, maxSize, retainCount)
    log.SetOutput(rotlog)
}