James Dube jamesdube

Here are several different ways to test a TCP port without telnet.

BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

$ cat &lt; /dev/tcp/127.0.0.1/23

Please make fork of this, as this can be removed by Github.com sooner or later.

CATF44LT7C-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

Open a webpage that uses the CA with Firefox
Click the lock-icon in the addressbar -> show information -> show certificate
the certificate viewer will open
click details and choose the certificate of the certificate-chain, you want to import to CentOS
click "Export..." and save it as .crt file
Copy the .crt file to /etc/pki/ca-trust/source/anchors on your CentOS machine
run update-ca-trust extract
test it with wget https://thewebsite.org

Create namespace.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: gitlab

kubectl create -f ./namespace.yaml

	#!/bin/bash
	# run this scripts with `bash emoji-info.sh` or `./emoji-info.sh`

	usage() {
	cat << EOF
	usage: $0 [options] <emoji>

	Options:
	-h Show this message
	-o Octal Escape Sequence

	package mycompany.myappp.config;

	import org.apache.commons.io.IOUtils;
	import org.springframework.context.annotation.Configuration;
	import org.springframework.http.HttpInputMessage;
	import org.springframework.http.HttpOutputMessage;
	import org.springframework.http.MediaType;
	import org.springframework.http.converter.AbstractHttpMessageConverter;
	import org.springframework.http.converter.HttpMessageConverter;
	import org.springframework.http.converter.HttpMessageNotReadableException;

	Serial Keys:

	FU512-2DG1H-M85QZ-U7Z5T-PY8ZD
	CU3MA-2LG1N-48EGQ-9GNGZ-QG0UD
	GV7N2-DQZ00-4897Y-27ZNX-NV0TD
	YZ718-4REEQ-08DHQ-JNYQC-ZQRD0
	GZ3N0-6CX0L-H80UP-FPM59-NKAD4
	YY31H-6EYEJ-480VZ-VXXZC-QF2E0
	ZG51K-25FE1-H81ZP-95XGT-WV2C0
	VG30H-2AX11-H88FQ-CQXGZ-M6AY4

	kind: ClusterRole
	apiVersion: rbac.authorization.k8s.io/v1
	metadata:
	name: system:aggregated-metrics-reader
	labels:
	rbac.authorization.k8s.io/aggregate-to-view: "true"
	rbac.authorization.k8s.io/aggregate-to-edit: "true"
	rbac.authorization.k8s.io/aggregate-to-admin: "true"
	rules:
	- apiGroups: ["metrics.k8s.io"]

	#!/bin/bash
	## Generic installation on all nodes

	sysctl -w net.ipv4.ip_forward=1
	sed -i 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/g' /etc/sysctl.conf
	sudo sysctl -p /etc/sysctl.conf

	swapoff -a
	sed -i '2s/^/#/' /etc/fstab

	#!/usr/bin/env bash

	set -e -o pipefail; [[ -n "$DEBUG" ]] && set -x

	CERT_DIR="${CERT_DIR:-"/usr/local/share/ca-certificates"}"

	function usage() {
	echo "Usage: $(basename "$0") [-n clustername] certfile ..." >&2
	}