lacek

#!/bin/bash
# Script to use custom ssh keys for various git repositories
# Run without arguments to get usage info.
#
# How it works:
# When used with SSH, git sends the path to the repository in the SSH command.
#   @see: https://github.com/git/git/blob/e870325/connect.c#L1268
# We extract this info and search for a key with the name.
# Based on the source, this seems to be used format since v2.0 at least.
#   @see: https://github.com/git/git/commit/a2036d7

lacek

Testing MySQL InnoDB Cluster with Docker

1. Spin up the cluster

docker-compose up -d
docker-compose exec mysql1 mysqlsh -f /init.js

2. Test access to the cluster

lacek

import TriggerComponent from 'ember-power-select/components/power-select-multiple/trigger';

const isTouchDevice = !!window && 'ontouchstart' in window;

export default TriggerComponent.extend({
  layoutName: 'components/trigger',

  didInsertElement() {
    let select = this.get('select');
    this.input = document.getElementById(`ember-power-select-trigger-multiple-input-${select.uniqueId}`);

lacek

#!/bin/sh
FILE_ID=$1
DEST=$2

if [ -z "$FILE_ID" -o -z "$DEST" ]; then
    >2 echo "USAGE: sh $0 <FILE_ID> <DEST>"
    exit 1
fi

cookie=$(mktemp -ut gdown.XXXXXX)

lacek

import Controller from '@ember/controller';

export default Controller.extend({
  init() {
    this._super(...arguments);
    this.set('items', [
      'Adenosine',
      'Cytosine',
      'Guanine',
      'Thymidine',

lacek

Trial of Upgrading MySQL 5.5 to 5.7 in Docker

1. Start a MySQL 5.5 and load data

   docker run -d --rm --name db55 \
       -v $PWD/my_db:/var/lib/mysql \
       -e 'MYSQL_ROOT_HOST=%' \
       -e 'MYSQL_ROOT_PASSWORD=root' \
       -e 'MYSQL_DATABASE=my_db' \

-p 8306:3306 mysql:5.5

lacek

import Ember from 'ember';
import { computed } from '@ember/object';

export default Ember.Component.extend({
  classNames: 'grid-value',
  attributeBindings: ['style'],
  value: 0,
  style: computed('value', function() {
    let value = this.get('value');
    return Ember.String.htmlSafe(`background-color: rgb(${value}, 0, 0)`);

lacek

# installed Docker CE 18.09.7 on Ubuntu 18.04
sudo curl -fsSLo /usr/local/bin/kind https://github.com/kubernetes-sigs/kind/releases/download/v0.4.0/kind-linux-amd64
sudo chmod +x /usr/local/bin/kind
docker pull kindest/node:v1.13.7
cat <<EOF > kind-config.yaml
kind: Cluster
# see https://godoc.org/sigs.k8s.io/kind/pkg/apis/config/v1alpha3#Cluster
apiVersion: kind.sigs.k8s.io/v1alpha3
nodes:

lacek

FROM nvidia/cuda:10.1-base-ubuntu18.04

RUN  sed -i -E -e 's@//(archive|security).ubuntu@//hk.archive.ubuntu@' /etc/apt/sources.list \
    && apt-get update \
    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
        apt-transport-https \
        ca-certificates \
        curl \
        gnupg2 \
        iptables \

lacek

Background

The installation kubeadm-dind-cluster requires Internet, because both the script itself and kubeadm inside pulls Docker images from Docker Hub and Google Container Registry.

One way to avoid the Internet requirement is to host a local Docker registry preloaded with all images required and configure the cluster to pull from this local registry.

The setup below demonstration air gap installation of Kubernetes v1.13, tested with Ubuntu 18.04 and Docker CE 18.09.6.

Preparation (Internet required)