saivachandran saivachandran

Docker centOS 7 based with systemd enabled and sshd installed.

Build image

docker build --rm -t c7-systemd-sshd .

Run

docker run --rm --privileged=true -p 22:22 -v /sys/fs/cgroup:/sys/fs/cgroup:ro c7-systemd-sshd

Alternatively you can use docker compose

Revert the full commit

Sometimes you may want to undo a whole commit with all changes. Instead of going through all the changes manually, you can simply tell git to revert a commit, which does not even have to be the last one. Reverting a commit means to create a new commit that undoes all changes that were made in the bad commit. Just like above, the bad commit remains there, but it no longer affects the the current master and any future commits on top of it.

git revert {commit_id}

About History Rewriting

Delete the last commit

Deleting the last commit is the easiest case. Let's say we have a remote origin with branch master that currently points to commit dd61ab32. We want to remove the top commit. Translated to git terminology, we want to force the master branch of the origin remote repository to the parent of dd61ab32:

Content

Basics
Disk and File System Management
- General Disk Manipulation (non-LVM)
LVM

Warning - Steps to lower Root EBS Volume still a work in progress and being tested

Steps to Lower Root EBS Volume Size on an Instance

Create new Ubuntu Micro instance (e.g., Name = Tools)
Stop instance you want to lower EBS volume.
Create AMI image as backup of your instance.
Create an empty X GB Amazon EBS volume in the same availability zone where X is smaller size you desire.
Detach the volume you wish to resize from the stopped instance from step 2 above.
Attach the original volume to the Tools instance (e.g., as /dev/xvdf)
Attach new downsized volume to the Tools instance (e.g., as /dev/xvdg)

reference

cheatsheet

Pipeline version 1

pipeline {
  agent { label "linux" }
  stages {
    stage('Hello') {
      steps {
        sh '''
          aws --version
        '''

From: http://stackoverflow.com/questions/1676632/whats-a-quick-way-to-comment-uncomment-lines-in-vim

For those tasks I use most of the time block selection.

Put your cursor on the first # character, press Ctrl``V (or Ctrl``Q for gVim), and go down until the last commented line and press x, that will delete all the # characters vertically.

For commenting a block of text is almost the same: First, go to the first line you want to comment, press Ctrl``V, and select until the last line. Second, press Shift``I``#``Esc (then give it a second), and it will insert a # character on all selected lines. For the stripped-down version of vim shipped with debian/ubuntu by default, type : s/^/# in the second step instead.

	alias k="kubectl"
	alias v="vim"

	function ns () {
	kubectl config set-context --current --namespace=$1
	}

	export drc="--dry-run=client -oyaml"
	export drs="--dry-run=server -oyaml"

	# Create a new repository on the command line

	touch README.md
	git init
	git add README.md
	git commit -m "first commit"
	git remote add origin https://github.com/c0ldlimit/vimcolors.git
	git push -u origin master

	# Push an existing repository from the command line