liejuntao001

High CPU from kworker/0:x-kacpi_notify

Ubuntu 20.04 LTS

Update: this problem is fixed after I did "apt dist-upgrade" on 9/21/2020
Update again: Acutally not fixed. It happened again after unplug/plug the usb-c hub.

I recently got a USB-C Hub (Targus ACA958USZ). When it's plugged in, the laptop gives high cpu from process
I've found a few USB-C hubs from various manufactures with the same problem. I think they are of the same chipset.

liejuntao001

# simple copy
rsync -axHAWXS /data/a/ /data/b/

# simple copy showing progress in terminal
rsync -axHAWXS --numeric-ids --info=progress2 /data/a/ /data/b/

# show copy stats at the end
rsync -axHAWXS --stats /data/a/ /data/b/

# copy folder excluding the "lost+found" directory

liejuntao001

Configuration snippets for Highly Available NFS cluster in Kubernetes, a cloud vendor independent storage solution

HAProxy config

frontend nfs
    bind 192.168.1.100:32049
    mode tcp
 option tcplog

liejuntao001

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: prometheus-ingress
  namespace: monitoring
  annotations:
    kubernetes.io/ingress.class: "traefik"
    ingress.kubernetes.io/auth-type: "basic"
    ingress.kubernetes.io/auth-secret: "kubesecret"
spec:

liejuntao001

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: kibana-ingress
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: "traefik"
    ingress.kubernetes.io/auth-type: "basic"
    ingress.kubernetes.io/auth-secret: "kubesecret"
spec:

liejuntao001

# traefik.toml
debug = false
checkNewVersion = false
logLevel = "INFO"
defaultEntryPoints = ["http","https"]
InsecureSkipVerify = true
[entryPoints]
    [entryPoints.http]
    address = ":80"
    [entryPoints.http.redirect]

liejuntao001

frontend k8s-api
    bind *:6443
    mode tcp
    option tcplog
    default_backend k8s-api

backend k8s-api
    mode tcp
    option tcplog
    option tcp-check

liejuntao001

# this is for haproxy1
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 101
    priority 101  # higher priority
    advert_int 1
    unicast_src_ip 192.168.3.122  # haproxy1 private ip
    unicast_peer {
        192.168.2.17  # haproxy2 private ip

liejuntao001

// Modified version of:
// https://github.com/coreos/prometheus-operator/blob/master/contrib/kube-prometheus/example.jsonnet

local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';  // https://github.com/ksonnet/ksonnet-lib/blob/master/ksonnet.beta.3/k.libsonnet - imports k8s.libsonnet
// * https://github.com/ksonnet/ksonnet-lib/blob/master/ksonnet.beta.3/k8s.libsonnet defines things such as "persistentVolumeClaim:: {"
//
local pvc = k.core.v1.persistentVolumeClaim;  // https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.11/#persistentvolumeclaim-v1-core (defines variable named 'spec' of type 'PersistentVolumeClaimSpec')

local kp = (import 'kube-prometheus/kube-prometheus.libsonnet') +
           (import 'kube-prometheus/kube-prometheus-kubeadm.libsonnet') {

liejuntao001

# Backup the Ceph Filesystem in Kubernetes. Code for https://liejuntao001.medium.com/file-system-backup-for-ceph-in-kubernetes-6c299c860ab3

---
apiVersion: batch/v1
kind: Job
metadata:
  name: rook-cephfs-backup-job
  namespace: rook-ceph
spec:
  template: