0# osx-commands usefull osx commands

set input volume for mic in osx to fixed value ( no auto adjust )

while sleep 2; do osascript -e "set volume input volume 50"; done

WSL ubuntu

intellij run gui

xming

sudo apt-get install libxtst6

sudo apt-get install libxi6

sudo updatedb

export DISPLAY=:0

linux-commands

SSH

add ssh key to the agent to not type pasphrase every time

ssh-add ~/.ssh/id_rsa

check server fingerprints

ssh-keygen -lf <(ssh-keyscan serverhost 2>/dev/null)

tunnel ports from remote host to your local machine

port on remote host is 9000 local host port is 9090

ssh -L 9090:host_name:9000 user@host_name

for non interactive mode use

ssh -NL 9090:host_name:9000 user@host_name

or

ssh -NL 9090:localhost:9000 user@host_name

for many tunnels to single host use

ssh -NL 9090:localhost:9000 -L 9091:localhost:9001 user@host

easy fire wall

apt-get install ufw
ufw default deny
ufw allow ssh
ufw allow http
ufw enable

minikube/kubectl

add new cluster to config

after adding to bashrc k8s_merge.sh

kmerge kubeconfig_file_from_provider

remove cluster config from contexts

kubectl config unset users.user_name
kubectl config unset contexts.context_name
kubectl config unset clusters.cluster_name

install package in alpine linux

apk update
apk add package_name

debug k8s init commands in containers

kubectl logs po/pod_name -c command_name

scale rc

kubectl scale --replicas=3 rc/name_here

deletet rc

kubectl delete rc name_here

get kubernetes nodes with labels

kubectl get nodes --show-labels

set label on kubernetes node

kubectl label nodes node_name label=value

delete label on kubernetes node

kubectl label nodes node_name label-

get prompt on pod

kubectl exec -it pod-name -- /bin/bash

configure kubectl to use gcloud

gcloud container clusters get-credentials cluster_name --zone zone

kubectl add ssl certificate

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=foo.com"
kubectl create secret tls foo-secret --key /tmp/tls.key --cert /tmp/tls.crt

kubectl port forwarding

kubectl port-forward kibana-0 5601:5601

kubectl get env variable

kubectl exec -it core-admin-0 -- printenv | grep 'VAR_NAME'

update k8s deployment with changes from file

kubectl apply -f file.yaml

static IP on GCE

gcloud compute addresses create ip-name --global
gcloud compute addresses describe ip-name --global

Docker

remove everything

docker system prune --all --force --volumes

delete local docker images to clear cache

docker rmi -f $(docker images -a -q)

delete all stopped docker containers

docker rm $(docker ps -a -q)

connection form container to container

docker network create mynet
docker run --name foo --net mynet img
docker run --name bar --net mynet img

run docker image in interactive mode

docker run -it openjdk:8-jre-alpine /bin/sh

"ssh" into container

docker exec -it container_name /bin/sh

get container IP

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name 

Kafka

create topic

kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic topic_name

list all topics

kafka-topics.sh --list --zookeeper localhost:2181

send messages

kafka-console-producer.sh --broker-list localhost:9092 --topic topic_name

get messages from offset 0

kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic topic_name --from-beginning

get info about topic

kafka-topics.sh --zookeeper localhost:2181 --describe --topic topic_name

Others

pretty print Akka members json in bash

curl akka:19999/members | python -m json.tool

ssh

.ssh/config
AddKeysToAgent yes

chmod 600 .ssh/config

.zshrc
if [ -z $SSH_AGENT_PID ]; then  # if no agent & not in ssh
    eval `ssh-agent -s`
fi

or with oh my zsh

plugins=(git ssh-agent)

spacemacs

sudo update-alternatives --config editor

.spacemacs
dotspacemacs-mode-line-unicode-symbols nil

create folder with name set to current date

mkdir `date +'%d-%m-%Y'`

install mosh

sudo apt-get install software-properties-common
sudo apt-get install mosh

export LANGUAGE=pl_PL.UTF-8
export LANG=pl_PL.UTF-8
export LC_ALL=pl_PL.UTF-8
locale-gen pl_PL.UTF-8
sudo dpkg-reconfigure locales

Create new go lang module

go mod init hello
go build

Parse json with unix cmd

curl -sS "https://api.convertkit.com/v3/subscribers?api_secret=SECRET_HERE" | python -c "import sys, json; print json.load(sys.stdin)['total_subscribers']"

use sed to remove \n from file

sed -e ':a' -e 'N' -e '$!ba' -e 's/\n//g' file_name

allow X410 connection from WSL2 in windows 10

As administrator

New-NetFirewallRule -DisplayName "WSL" -Direction Inbound -InterfaceAlias "vEthernet (WSL)" -Action Allow

set display env var for x410

export DISPLAY=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2; exit;}'):0.0