Raboo

Set your etcdctl endpoints and certificates if needed

export ETCDCTL_API=3
export ETCDCTL_KEY="/etc/kubernetes/pki/etcd/server.key"
export ETCDCTL_CERT="/etc/kubernetes/pki/etcd/server.crt"
export ETCDCTL_CACERT="/etc/kubernetes/pki/etcd/ca.crt"

Check current database size vs quota

Raboo

kubectl run netshoot --rm -it --image=nicolaka/netshoot --annotations='inject-certs=enabled'  --overrides='
{
  "spec": {
    "securityContext": {
      "runAsNonRoot": true,
      "runAsUser": 1000,
      "seccompProfile": {
        "type": "RuntimeDefault"
      }
    },

Raboo

---
apiVersion: v1
kind: Namespace
metadata:
  labels:
    pod-security.kubernetes.io/enforce: restricted
    pod-security.kubernetes.io/warn: restricted
    pod-security.kubernetes.io/audit: restricted
  name: fio-bench
---

Raboo

JVM 21 introduces G1GC Generational, it can reduce heap and cpu consumption.
ZGenerational ZGC mode organises objects into young and old generations, allowing tailored garbage collection strategies. Fast incremental sweeps in the young generation ensure responsive performance, while comprehensive, less frequent clean-ups in the old generation maintain stability over time, exclusively supported in recent JDK versions like JDK 21

-XX:+UseZGC -XX:+ZGenerational

ZGC got production ready in JDK 15, focuses more on lower latency, but can also increase throughput in many cases.

-XX:+UseZGC

Raboo

List top 5 CPU users and list top 5 Memory users.

ps -eo user,pcpu,pmem | tail -n +2 | \
awk '{
  num[$1]++; cpu[$1] += $2; mem[$1] += $3
}
END {
  # Dump into files for sorting separately
  for (u in cpu)

Raboo

ansible all -i localhost, -c local -m template -a "src=test.j2 dest=./test.txt" --extra-vars=@group_vars/all.yml

ansible all -i "localhost," -c local -m template -a "src=test.j2 dest=./test.txt" --extra-vars='{"users": ["Mike", "Smith", "Klara", "Alex"]}'

Raboo

Considerations for Running Postgres on NFS

Background

Over the weekend, I decided to try running a Postgres database in my Homelab. In my current setup, the most convenient option for storage is NFS. However, NFS is especially tricky for databases. A misconfigured setup can lead to performance or data corruption issues.

After watching

Raboo

Computer Information:
Manufacturer: To Be Filled By O.E.M.
Model: To Be Filled By O.E.M.
Form Factor: Desktop
No Touch Input Detected
Processor Information:
CPU Vendor: GenuineIntel
CPU Brand: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
CPU Family: 0x6

Raboo

#!/bin/bash
#
# A simple bash script to migrate your Docker Hub organization to Github Container Registry.
# forked from https://gist.github.com/charlieoleary/05c1dab2e19703f73a041e585e060dc9
#
# In order for this to work you must run this from a system that is logged in to both the GHCR 
# repository you are migrating to and the Docker Hub organization you are migrating FROM with
# podman.
#
# Due to how Docker works (pulling / pushing images), this script can be run over and over

Raboo

# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #
#              Yet-Another-Bench-Script              #
#                     v2021-12-28                    #
# https://github.com/masonr/yet-another-bench-script #
# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #

Fri 14 Jan 2022 10:33:16 AM UTC

Basic System Information:
---------------------------------