Abhinav korpal abhinavkorpal

README

Services declared as oneshot are expected to take some action and exit immediatelly (thus, they are not really services, no running processes remain). A common pattern for these type of service is to be defined by a setup and a teardown action.

Let's create a example foo service that when started creates a file, and when stopped it deletes it.

Define setup/teardown actions

Create executable file /opt/foo/setup-foo.sh:

	sed -i 's/original/new/g' file.txt

	Explanation:

	sed = Stream EDitor
	-i = in-place (i.e. save back to the original file)
	The command string:

	s = the substitute command
	original = a regular expression describing the word to replace (or just the word itself)

	openssl x509 -req -sha256 -in server.csr \
	-signkey server.key -out server.crt

	cat server.crt

	openssl x509 -noout -text -in server.crt

	man x509, man req; man genrsa

	create a cluster:
	minikube version
	minikube start
	kubectl version
	kubectl cluster-info
	kubectl get nodes

	To insert new text esc + i ( You have to press 'escape' key then 'i')
	To save file esc + : + w (Press 'escape' key then 'colon' and finally 'w')
	To save file with file name (save as) esc + : + w "filename"
	To quit the vi editor esc + : + q
	To quit without saving esc + : + q!
	To save and quit vi editor esc + : + wq
	To search for specified word in forward direction esc + /word (Press 'escape' key, type /word-to-find, for e.g. to find word 'shri', type as
	/shri)
	To continue with search n
	To search for specified word in backward direction esc + ?word (Press 'escape' key, type word-to-find)

	sudo aptitude update
	echo "------------------------------------------------------------------------------------------------------------------------------------"
	sudo aptitude upgrade -y
	echo "-----------------------------------------------------------------------------------------------------------------------------------"
	sudo aptitude autoclean
	echo "-----------------------------------------------------------------------------------------------------------------------------------"
	sudo apt-get autoclean
	echo "-----------------------------------------------------------------------------------------------------------------------------------"
	sudo apt-get autoremove
	echo "-----------------------------------------------------------------------------------------------------------------------------------"

	openssl req -new -key server.key -out server.csr

	cat server.csr

	openssl req -noout -text -in server.csr


	sudo apt-get update -o Dir::Etc::SourceList=/etc/apt/security.sources.list
	sudo apt-get upgrade -o Dir::Etc::SourceList=/etc/apt/security.sources.list
	sudo apt-get autoremove

	#!/bin/bash

	TEXT_RESET='\e[0m'
	TEXT_YELLOW='\e[0;33m'
	TEXT_RED_B='\e[1;31m'

	sudo apt-get update
	echo -e $TEXT_YELLOW
	echo 'APT update finished...'
	echo -e $TEXT_RESET