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{-# LANGUAGE FlexibleContexts #-}

module Main where

import           Control.Applicative  (liftA2)
import           Control.Monad.Reader (MonadIO, MonadReader, ReaderT, ask,
                                       runReaderT)

{- | Let's say we have a deeply nested call stack. There are many functions
   calling other functions.

ecthiender

Install doom emacs

git clone --depth 1 https://github.com/hlissner/doom-emacs ~/.emacs.d
cd ~/.emacs.d
bin/doom install

Optional

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#!/bin/bash
set -e

resolution="$1"
if [[ -z "$resolution" ]]; then
  resolution="1366x768"
  echo "[WARN] No resolution passed. Defaulting to $resolution."
fi

outfile="$2"

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/* The error handling library */

type ResultError<E> = {
    errors: E,
    trace?: any
}

type Success<T> = {
    value: T
}

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Perform health checks on your hard disk (Linux)

Check bad sectors

program: badblocks

sudo badblocks -v /dev/sdxy > badsectors.txt

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Setup Google cloud image registry with Hasura k8s platform on GKE

This guide helps you to setup the image registry configuration on a multi-node Hasura installation on GKE.

This is required in multi-node setups, because the sshd agent (which builds the docker images on git push) needs to push the image to an external image registry service, so that the image is available on all the nodes.

Pre-requisite

1. gcloud CLI (https://cloud.google.com/sdk/install)
2. kubectl (https://kubernetes.io/docs/tasks/tools/install-kubectl/)

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curl 'http://localhost:8080/v1alpha1/graphql' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0' -H 'Accept: */*' -H 'Accept-Language: en-US,en;q=0.5' --compressed -H 'Referer: http://localhost:8080/console/api-explorer' -H 'content-type: application/json' -H 'x-hasura-role: admin' -H 'Origin: http://localhost:8080' -H 'DNT: 1' -H 'Connection: keep-alive' --data '{"query":"\n    query IntrospectionQuery {\n      __schema {\n        queryType { name }\n        mutationType { name }\n        subscriptionType { name }\n        types {\n          ...FullType\n        }\n        directives {\n          name\n          description\n          locations\n          args {\n            ...InputValue\n          }\n        }\n      }\n    }\n\n    fragment FullType on __Type {\n      kind\n      name\n      description\n      fields(includeDeprecated: true) {\n        name\n        description\n        args {\n          ...InputValue\n        }\n        type {\n          ...TypeRef\n   

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Setup an external private image registry, with Hasura k8s platform

If you are trying to install Hasura on a multi-node Kubernetes cluster and wondering how to setup the image registry, this is the guide for you.

Let us see how to setup a private image registry on a multi-node Hasura k8s platform cluster. This is required in multi-node setups, because the sshd agent (which builds the docker images on git push) needs to push the image to an external image registry service, so that the image is available on all the nodes.

NOTE: Do these steps before installing Hasura on the Kuberentes cluster.

Setup a private registry

1. Setup an account in your private registry.

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import random
from datetime import datetime
import time
import json
import requests

query = """
mutation {
  insert_conditions (objects: [
    {

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version: '2'
services:
  timescale:
    image: timescale/timescaledb:latest-pg10
    restart: always
    environment:
      POSTGRES_PASSWORD: postgrespassword
    volumes:
    - db_data:/var/lib/postgresql/data
  graphql-engine: