vjt

#!/bin/bash
# 
# Copy data from a Time Machine volume mounted on a Linux box.
#
# Usage: copy-from-time-machine.sh <source> <target>
#
# source: the source directory inside a time machine backup
# target: the target directory in which to copy the reconstructed
#         directory trees. Created if it does not exists.
#

tuxfight3r

#clone the repo
git clone http://git.ipxe.org/ipxe.git

cd ipxe/src
cat >ubuntu-amd64-installer.ipxe <<EOF
#!ipxe
dhcp
echo Starting Ubuntu x64 installer for ${hostname}
set base-url http://archive.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64
kernel ${base-url}/linux

so0k

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

mdo

Ikea Bekant standing desk with Gerton table top

roidelapluie

groups:
- name: datetime
  rules:
  - record: daily_saving_time_belgium
    expr: |
      (vector(0) and (month() < 3 or month() > 10))
      or
      (vector(1) and (month() > 3 and month() < 10))
      or
      (

felixkrohn

node debug pod with custom image (tcpdump etc)

oc debug node/ip-1-2-3-4.internal --image=registry.tld/namespace/image:tag

delete pod via API - from https://access.redhat.com/solutions/3536141

echo '{ "propagationPolicy": "Background" }' | curl -k -X DELETE -d @-  -H "Authorization: Bearer $TOKEN" -H 'Accept: application/json' -H 'Content-Type: application/json'  https://openshift-master.$DOMAIN/api/v1/namespaces/$NAMESPACE/pods/$PODNAME

kill haproxy processes older than 12h

ps -eo pid,etimes,comm,user | awk '{if ($3 = /haproxy/ && $2>43200) print $1}' | xargs kill -15

add infra nodeselector to namespace with oc patch

oc patch namespace $NAMESPACE -p '{"metadata":{"annotations":{"openshift.io/node-selector":"region=infra"}}}'

get a table of canonical nodenames together with their name label:

oc get nodes -Lname --output=jsonpath='{range .items[*].metadata}{.name}{" "}{.labels.name}{"\n"}'

dcode

Setup CoreDNS w/ etcd backend

Why CoreDNS

[CoreDNS][coredns] was designed from the ground up to provide robust, plugin-based DNS server for use in cloud environments. Namely, it serves as the default primary service discovery mechanism for Kubernetes.

Using CoreDNS allows us to have a lightweight DNS server on RockNSM (11 Mb binary is all that's needed!) to facilitate multi-node service discovery. Alternatively, if another existing DNS service is available, this can be used instead. Aligning with the way the Kubernetes manages service discovery also allows us to build new RockNSM features in parallel with the coming Kubernetes support.

RockNSM Application

felixkrohn

• log into a router pod (oc rsh -n default router-YY-XXXXX)
• confirm the socket used by haproxy is /var/lib/haproxy/run/haproxy.sock (using ps ax)
• connect to the socket with socat socat /var/lib/haproxy/run/haproxy.sock stdio
• use "prompt" and "help" for the corrsponding actions, or directly call echo "prompt" | socat /var/lib/haproxy/run/haproxy.sock stdio echo "help" | socat /var/lib/haproxy/run/haproxy.sock stdio
• get raw stats in CSV format. note the "iid" value for the backend you're debugging echo "show stat" | socat /var/lib/haproxy/run/haproxy.sock stdio
• get "typed" stats in the format [BS].IID.x.FIELD-ID.FIELD-Description with the value in the last column

felixkrohn

# after an accidental "oc delete pv --all" all PVs on the cluster are marked as "Terminating".
# As a result all PV have to be re-created, which is done by the script.
# Before force-deleting the PV, all deployments accessing the PV via PVC are being scaled down, and scaled up again afterwards.
#
# (by the way, the "Terminating" status is not a real status, but is what oc/kubectl print out
# when an object has a DeletionTimestamp, which is immutable and cannot be deleted anymore. See
# https://github.com/kubernetes/kubernetes/blob/master/pkg/kubectl/describe/versioned/describe.go#L1374-L1378
#           if pv.ObjectMeta.DeletionTimestamp != nil {
#                 w.Write(LEVEL_0, "Status:\tTerminating (lasts %s)\n", translateTimestampSince(*pv.ObjectMeta.DeletionTimestamp))
#       		} else {

joaofl

#!/bin/sh

# ref: https://piunikaweb.com/2019/03/25/samsung-galaxy-s10-remove-bundled-bloatwares-without-root/
# install the following app to see the packages names: 
# use the following command to generate the unistall command, for easy copy and paste:
# adb shell 'pm list packages' | sed -e 's/^/adb uninstall --user 0 /' | grep FILTER_HERE | sort

#things to install if removing keyboard
# F-Droid
# APK Analyser