https://renehernandez.io/Recent content in Home on Rene Hernandez's SiteHugo -- gohugo.ioen-us2017 - 2021. All rights reservedJul 4, 2023https://renehernandez.io/snippets/one-liner-kill-grepped-processes-in-bash/Jul 4, 2023https://renehernandez.io/snippets/one-liner-kill-grepped-processes-in-bash/Use grep, awk and xargs to kill running processes in bashhttps://renehernandez.io/snippets/not-resource-field-exclude-directories-s3-bucket-policy/Aug 26, 2022https://renehernandez.io/snippets/not-resource-field-exclude-directories-s3-bucket-policy/Usage of NotResource field in S3 bucket policies to exclude matching directories from the policy permissionshttps://renehernandez.io/snippets/check-image-tag-container-registry/Mar 10, 2022https://renehernandez.io/snippets/check-image-tag-container-registry/Steps to authenticate and verify that docker image exists in GitHub Container Registry (ghcr.io)https://renehernandez.io/notes/rolling-pods-config-changes/Mar 6, 2022https://renehernandez.io/notes/rolling-pods-config-changes/Different options to roll Pods when ConfigMap, Secrets or other resources changehttps://renehernandez.io/snippets/customize-api-version-helm-templates/Feb 25, 2022https://renehernandez.io/snippets/customize-api-version-helm-templates/How to support deploying the same resource to Kubernetes clusters with different apiVersionshttps://renehernandez.io/snippets/first-non-empty-value-from-list/Jan 28, 2022https://renehernandez.io/snippets/first-non-empty-value-from-list/Using the coalesce function to write a one-line templatehttps://renehernandez.io/tutorials/private-github-action-private-repo/Jan 18, 2022https://renehernandez.io/tutorials/private-github-action-private-repo/Implement a GitHub action in a private repository that sets up a tool from another private repo and how to use it in workflowshttps://renehernandez.io/notes/archiving-a-project/Dec 20, 2021https://renehernandez.io/notes/archiving-a-project/A series of steps to take into account when shutting down/archiving a project from a DevOps/SRE viewpointhttps://renehernandez.io/snippets/rename-kubernetes-context/Dec 3, 2021https://renehernandez.io/snippets/rename-kubernetes-context/How to rename a kubernetes context using the kubectl clihttps://renehernandez.io/snippets/cloudflare-page-rule-wp-admin-trailing-slash/Nov 25, 2021https://renehernandez.io/snippets/cloudflare-page-rule-wp-admin-trailing-slash/Solve wp-admin redirect without trailing slash using a Cloudflare page rule in terraformhttps://renehernandez.io/notes/env-vars-precedence-k8s-pod/Nov 22, 2021https://renehernandez.io/notes/env-vars-precedence-k8s-pod/The order of precedence is for environment variables and what happens when there are multiple occurrenceshttps://renehernandez.io/snippets/multiline-strings-as-a-job-output-in-github-actions/Nov 14, 2021https://renehernandez.io/snippets/multiline-strings-as-a-job-output-in-github-actions/Workarounds to handle multiline strings when passing them as outputs between jobs.https://renehernandez.io/snippets/bind-environment-variables-to-config-struct-with-viper/Nov 9, 2021https://renehernandez.io/snippets/bind-environment-variables-to-config-struct-with-viper/Workarounds to allow environment variables to override settings from config file using viperhttps://renehernandez.io/snippets/installing-docker-compose-v2-release-as-a-plugin-in-linux/Oct 13, 2021https://renehernandez.io/snippets/installing-docker-compose-v2-release-as-a-plugin-in-linux/Using `jq` to parse GitHub releases to install the latest linux binary for the docker compose pluginhttps://renehernandez.io/snippets/cloudflare-firewall-rule-to-block-bots-from-accessing-multiple-domains/Aug 30, 2021https://renehernandez.io/snippets/cloudflare-firewall-rule-to-block-bots-from-accessing-multiple-domains/Using `formatlist` and `join` functions to accept variable number of domains in Terraform modulehttps://renehernandez.io/tutorials/automating-gitlab-pipelines-for-base-docker-images/Aug 24, 2021https://renehernandez.io/tutorials/automating-gitlab-pipelines-for-base-docker-images/An approach to streamline the management of multiple base Docker images used as part of downstream images or CI jobs. Leveraging Ruby and gitlab child pipelines to abstract away the jobs definitions per Dockerfile.https://renehernandez.io/snippets/values-precedence-in-helmfile/Jun 21, 2021https://renehernandez.io/snippets/values-precedence-in-helmfile/Workaround using environments to establish precedence between valueshttps://renehernandez.io/snippets/cleaning-local-docker-cache/Jun 2, 2021https://renehernandez.io/snippets/cleaning-local-docker-cache/Different options to prune docker resources from your local machinehttps://renehernandez.io/snippets/access-rds-logs-in-cloudwatch-using-awslogs/May 21, 2021https://renehernandez.io/snippets/access-rds-logs-in-cloudwatch-using-awslogs/Leverage awslogs command line to get RDS logs stored in CloudWatchhttps://renehernandez.io/snippets/delete-git-branches-no-longer-present-in-remote/May 14, 2021https://renehernandez.io/snippets/delete-git-branches-no-longer-present-in-remote/Step-by-step using Powershell to automate the processhttps://renehernandez.io/snippets/database-dump-from-a-mysql-pod/May 11, 2021https://renehernandez.io/snippets/database-dump-from-a-mysql-pod/Steps to create the dump using the kubectl clihttps://renehernandez.io/snippets/file-option-positioning-in-tar-command/May 10, 2021https://renehernandez.io/snippets/file-option-positioning-in-tar-command/Solves 'Cannot stat: No such file or directory' errorhttps://renehernandez.io/snippets/add-a-python-package-in-an-existing-non-python-alpine-image/May 6, 2021https://renehernandez.io/snippets/add-a-python-package-in-an-existing-non-python-alpine-image/Step-by-step of how to install python and pip from apkhttps://renehernandez.io/snippets/checkout-from-and-push-to-existing-branch-in-a-fork/May 5, 2021https://renehernandez.io/snippets/checkout-from-and-push-to-existing-branch-in-a-fork/Step-by-step instructionshttps://renehernandez.io/snippets/mismatch-with-aws-acm-certs-validation-record-in-cloudflare-dns/Apr 30, 2021https://renehernandez.io/snippets/mismatch-with-aws-acm-certs-validation-record-in-cloudflare-dns/Fix terraform plan always updating ACM validation records in Cloudflare by using trimsuffix function to remove trailing dothttps://renehernandez.io/snippets/terraform-and-aws-wildcard-certificates-validation/Apr 28, 2021https://renehernandez.io/snippets/terraform-and-aws-wildcard-certificates-validation/DNS validation for AWS wildcard certificates using Terraformhttps://renehernandez.io/snippets/delete-multiple-crds-with-powershell-and-kubectl/Apr 22, 2021https://renehernandez.io/snippets/delete-multiple-crds-with-powershell-and-kubectl/Avoid manual deletion of each CRD object with the help of PowerShellhttps://renehernandez.io/snippets/aws-cli-v2-in-a-debian-flavored-docker-image/Apr 18, 2021https://renehernandez.io/snippets/aws-cli-v2-in-a-debian-flavored-docker-image/How to install the AWS CLI in a Debian-flavored docker imagehttps://renehernandez.io/snippets/smaller-images-using-multi-stage-builds-in-docker/Apr 11, 2021https://renehernandez.io/snippets/smaller-images-using-multi-stage-builds-in-docker/Produce smaller docker images by leveraging multi-stage builds in Dockerfileshttps://renehernandez.io/snippets/install-development-tools-in-alpine/Apr 2, 2021https://renehernandez.io/snippets/install-development-tools-in-alpine/Fix building gem native extensions by installing build-base in alpine docker imagehttps://renehernandez.io/snippets/download-files-from-urls/Apr 1, 2021https://renehernandez.io/snippets/download-files-from-urls/Using the ADD instruction to download files from URL in a dockerfilehttps://renehernandez.io/snippets/dynamic-from-base-images/Mar 31, 2021https://renehernandez.io/snippets/dynamic-from-base-images/Generate docker images that only differ on their base imagehttps://renehernandez.io/snippets/case-sensitive-changes-in-git/Mar 30, 2021https://renehernandez.io/snippets/case-sensitive-changes-in-git/Allow git to detect a file rename as a change to be committedhttps://renehernandez.io/snippets/unprotected-private-key-file/Mar 29, 2021https://renehernandez.io/snippets/unprotected-private-key-file/Solve unprotected private ssh key file error due to permissionshttps://renehernandez.io/chats/swc-13-devops-and-sre-as-a-career/Mar 9, 2021https://renehernandez.io/chats/swc-13-devops-and-sre-as-a-career/Candost and I talked about DevOps and SRE as a career. Opportunities, challenges, growth, etc.https://renehernandez.io/essays/why-ci-cd-matters/Mar 1, 2021https://renehernandez.io/essays/why-ci-cd-matters/Nowadays users expect instant results at all times. Companies, in turn, need to be capable of responding to changes with extremely quick turnarounds. This is where CI/CD comes into play. It helps businesses deliver value faster and better for their users.https://renehernandez.io/essays/devops-overview/Feb 7, 2021https://renehernandez.io/essays/devops-overview/An attempt to define what is DevOps, its main components and related foundational knowledge, such as The Three Ways of DevOps and the Four Keys.https://renehernandez.io/tutorials/introducing-appfile-a-declarative-way-of-managing-apps-in-digitalocean-app-platform/Nov 25, 2020https://renehernandez.io/tutorials/introducing-appfile-a-declarative-way-of-managing-apps-in-digitalocean-app-platform/A tool that interacts with the DigitalOcean App Platform to extend the app spec capabilities with support for multiple environments for the same application, diff output, etc.https://renehernandez.io/tutorials/terraforming-aws-vpc/Oct 19, 2020https://renehernandez.io/tutorials/terraforming-aws-vpc/Overview of VPC and related concepts, and walkthrough of how to deploy a VPC in AWS with Terraform.https://renehernandez.io/tutorials/terraforming-dns-with-aws-route53/Oct 9, 2020https://renehernandez.io/tutorials/terraforming-dns-with-aws-route53/Overview of AWS Route53 and how to configure DNS records using Terraformhttps://renehernandez.io/tutorials/first-steps-with-terraform-in-aws/Sep 30, 2020https://renehernandez.io/tutorials/first-steps-with-terraform-in-aws/Introduction to Terraform and how to set it up to manage AWS resourceshttps://renehernandez.io/tutorials/automate-changelog-and-releases-creation-in-github/Sep 23, 2020https://renehernandez.io/tutorials/automate-changelog-and-releases-creation-in-github/Using github-changelog-generator in combination with Github Actions to automatically update the Changelog file plus the body of project's releases.https://renehernandez.io/tutorials/faster-deployments-mysql-databases-k8s/Aug 17, 2020https://renehernandez.io/tutorials/faster-deployments-mysql-databases-k8s/Improving startup time for mysql containers by generating containers with data already loaded into the database.https://renehernandez.io/tutorials/deploying-gitlab-wikis-as-mkdocs-sites/May 18, 2020https://renehernandez.io/tutorials/deploying-gitlab-wikis-as-mkdocs-sites/Deploy GitLab wikis as mkdocs site in automated fashion using GitLab CI with an internal tool (Wiki Releaser)https://renehernandez.io/tutorials/introduction-to-ast-in-powershell/Sep 3, 2019https://renehernandez.io/tutorials/introduction-to-ast-in-powershell/A high level overview of AST in Powershell with links to docs and related contenthttps://renehernandez.io/tutorials/running-functions-remotely-in-powershell/Jun 16, 2019https://renehernandez.io/tutorials/running-functions-remotely-in-powershell/How to refactor a PowerShell scriptblock into multiple functions invoked remotelyhttps://renehernandez.io/tutorials/loading-custom-ssl-certificates-into-windows-containers/Apr 3, 2019https://renehernandez.io/tutorials/loading-custom-ssl-certificates-into-windows-containers/How to load custom ssl certificates present in the host machine into windows containers to handle HTTPS requests.https://renehernandez.io/notes/readings-2019/Feb 27, 2019https://renehernandez.io/notes/readings-2019/Technical books I read in 2019https://renehernandez.io/notes/what-to-learn-beginner-in-powershell/Jan 11, 2019https://renehernandez.io/notes/what-to-learn-beginner-in-powershell/A collection of resources to help poeple dive into PowerShellhttps://renehernandez.io/tutorials/ci-cd-pipeline-for-powershell/Dec 28, 2018https://renehernandez.io/tutorials/ci-cd-pipeline-for-powershell/A walkthrough of a CI/CD pipeline implementation for PowerShell moduleshttps://renehernandez.io/tutorials/automating-ghost-theme-pipeline/Nov 12, 2018https://renehernandez.io/tutorials/automating-ghost-theme-pipeline/Leveraging Docker and Jenkins to automate changes for a Ghost blog themehttps://renehernandez.io/tutorials/solid-and-oop-to-rescue-a-class/Aug 11, 2018https://renehernandez.io/tutorials/solid-and-oop-to-rescue-a-class/Refactoring a Filter class to leverage SOLID principles and reduce internal coupling while keeping the public class API intacthttps://renehernandez.io/tutorials/introducing-seams-across-a-hierarchy/Jul 14, 2018https://renehernandez.io/tutorials/introducing-seams-across-a-hierarchy/An approach to introduce an interception point in a class hierarchy to selectively execute some of the class' instances during integration tests.https://renehernandez.io/notes/manage-module-dependencies-in-powershell/May 17, 2018https://renehernandez.io/notes/manage-module-dependencies-in-powershell/An analysis of dependencies management for PowerShell moduleshttps://renehernandez.io/tutorials/data-structures-101-heap/Apr 23, 2018https://renehernandez.io/tutorials/data-structures-101-heap/Overview of the Heap data structure and a Ruby implementationhttps://renehernandez.io/tutorials/powershell-must-have-tools-for-development/Mar 24, 2018https://renehernandez.io/tutorials/powershell-must-have-tools-for-development/Some base libraries that I recommend to enhance your PowerShell development experiencehttps://renehernandez.io/notes/readings-2018/Feb 17, 2018https://renehernandez.io/notes/readings-2018/Technical books I read in 2018https://renehernandez.io/notes/readings-2017/Feb 10, 2018https://renehernandez.io/notes/readings-2017/Technical books I read in 2017https://renehernandez.io/tutorials/coding-at-the-wrong-level-of-abstraction/Jan 13, 2018https://renehernandez.io/tutorials/coding-at-the-wrong-level-of-abstraction/Extracting new objects out of validation steps in a long methodhttps://renehernandez.io/notes/overview-working-effectively-with-legacy-code/Dec 6, 2017https://renehernandez.io/notes/overview-working-effectively-with-legacy-code/Overview of Working Effectively with Legacy Code. What the main parts of the book are, its main ideas and some important details.https://renehernandez.io/tutorials/my-class-is-all-api-calls-how-do-i-get-it-under-test/Nov 13, 2017https://renehernandez.io/tutorials/my-class-is-all-api-calls-how-do-i-get-it-under-test/Refactoring a filesystem class to introduce testshttps://renehernandez.io/tutorials/ghost-rb-a-rest-api-client/Oct 2, 2017https://renehernandez.io/tutorials/ghost-rb-a-rest-api-client/An initial implementation of an API client for the Ghost API in rubyhttps://renehernandez.io/tutorials/ci-cd-pipeline-for-data-structures-101-gem/Sep 23, 2017https://renehernandez.io/tutorials/ci-cd-pipeline-for-data-structures-101-gem/CI/CD implementation for the DataStructures101 using Rubocop, CodeClimate, Yard and TravisCI.https://renehernandez.io/tutorials/running-my-blog-in-docker/Sep 9, 2017https://renehernandez.io/tutorials/running-my-blog-in-docker/A how-to of running a Ghost blog using Docker and Docker Composehttps://renehernandez.io/tutorials/data-structures-101-hash-table-part-3/Sep 1, 2017https://renehernandez.io/tutorials/data-structures-101-hash-table-part-3/Performance evaluation of the implementations in part-2 and analysis of the findingshttps://renehernandez.io/tutorials/data-structures-101-hash-table-part-2/Aug 22, 2017https://renehernandez.io/tutorials/data-structures-101-hash-table-part-2/A walkthrough of 2 different hash table implementaions: ChainedHashTable and ProbeHashTablehttps://renehernandez.io/tutorials/data-structures-101-hash-table-part-1/Aug 12, 2017https://renehernandez.io/tutorials/data-structures-101-hash-table-part-1/Introduction to the main concepts required for a Hash Table implementationhttps://renehernandez.io/tutorials/data-structures-101-linkedlist/Aug 5, 2017https://renehernandez.io/tutorials/data-structures-101-linkedlist/Example linked list and double linked list implementations using ruby.https://renehernandez.io/tutorials/implementing-tail-command-in-ruby/Aug 2, 2017https://renehernandez.io/tutorials/implementing-tail-command-in-ruby/How to use built-in methods (readlines, read and seek) in ruby to read lines from file and adding a simple CLI interface using optparsehttps://renehernandez.io/tutorials/ruby-script-for-mysql-monitoring/Aug 1, 2017https://renehernandez.io/tutorials/ruby-script-for-mysql-monitoring/Implementing a script to monitor a MySQL database using Ruby and the Benchmark classhttps://renehernandez.io/about/Jan 1, 0001https://renehernandez.io/about/