100 Days of DevOps and Cloud Series&#39; Articles

2 min read

Cover image for Day 2: Expiring Linux Users and Locking Down Security Groups

Nnamdi Felix Ibe

Jun 23

Day 2: Expiring Linux Users and Locking Down Security Groups

#devops #aws #linux #security

3 min read

Cover image for Day 3: Disabling Root SSH Login and Carving Out a VPC Subnet

Nnamdi Felix Ibe

Jun 26

Day 3: Disabling Root SSH Login and Carving Out a VPC Subnet

#devops #aws #linux #security

3 min read

Cover image for Day 4: Permissions That Actually Matter and Why S3 Versioning Shouldn't Be Optional

Nnamdi Felix Ibe

Jun 29

Day 4: Permissions That Actually Matter and Why S3 Versioning Shouldn't Be Optional

#aws #linux #devops #security

2 min read

Cover image for Day 5: SELinux Isn't Your Enemy, and GP3 Is Your Default

Nnamdi Felix Ibe

Jul 4

Day 5: SELinux Isn't Your Enemy, and GP3 Is Your Default

#devops #aws #linux #100daysofdevops

5 min read

Cover image for Day 6: Cron's Sneaky OR, and the EC2 Key You Only Get Once

Nnamdi Felix Ibe

Jul 6

Day 6: Cron's Sneaky OR, and the EC2 Key You Only Get Once

#devops #linux #aws #beginners

5 min read

Cover image for Day 7: Kill the SSH Password, and Resize EC2 the Right Way

Nnamdi Felix Ibe

Jul 8

Day 7: Kill the SSH Password, and Resize EC2 the Right Way

#devops #linux #aws #security

4 min read

Cover image for Day 8: Ansible's 'ping' Isn't a Ping, and the AWS Stop Flag Reads Backwards

Nnamdi Felix Ibe

Jul 11

Day 8: Ansible's 'ping' Isn't a Ping, and the AWS Stop Flag Reads Backwards

#devops #ansible #aws #linux

4 min read

Cover image for Day 9: A Database That Won't Start Is Usually a Permissions Problem

Nnamdi Felix Ibe

Jul 12

Day 9: A Database That Won't Start Is Usually a Permissions Problem

#devops #linux #aws #database

3 min read

Cover image for Day 10: Automating Backups Over SSH, and What an Elastic IP Really Costs Now

Nnamdi Felix Ibe

Jul 13

Day 10: Automating Backups Over SSH, and What an Elastic IP Really Costs Now

#devops #linux #aws #bash

3 min read

Cover image for Day 11: A WAR File Deploys Itself, and an ENI Is a Network Card You Can Move

Nnamdi Felix Ibe

Jul 15

Day 11: A WAR File Deploys Itself, and an ENI Is a Network Card You Can Move

#devops #linux #aws #tomcat

3 min read

Cover image for Day 12: A Port Conflict Killed httpd, and an Attached Volume Isn't a Mounted One

Nnamdi Felix Ibe

Jul 16

Day 12: A Port Conflict Killed httpd, and an Attached Volume Isn't a Mounted One

#devops #linux #aws #networking

7

3 min read

Cover image for Day 13: Firewall Rules Are About Order, and Creating an AMI Reboots the Instance

Nnamdi Felix Ibe

Jul 17

Day 13: Firewall Rules Are About Order, and Creating an AMI Reboots the Instance

#devops #linux #aws #security

3 min read

Cover image for Day 14: Restoring a Broken httpd, and the One EC2 Command With No Undo

Nnamdi Felix Ibe

Jul 19

Day 14: Restoring a Broken httpd, and the One EC2 Command With No Undo

#devops #linux #aws #cloud

3 min read

Cover image for Day 15: HTTPS on Nginx, and the Incremental Trick That Makes Snapshots Cheap

Nnamdi Felix Ibe

Jul 20

Day 15: HTTPS on Nginx, and the Incremental Trick That Makes Snapshots Cheap

#devops #linux #aws #nginx

3 min read

Cover image for Day 16: A Load Balancer in Ten Lines of Nginx, and Least-Privilege IAM

Nnamdi Felix Ibe

Jul 22

Day 16: A Load Balancer in Ten Lines of Nginx, and Least-Privilege IAM

#devops #linux #aws #iam

3 min read

Cover image for Day 17: Postgres Privileges and IAM Groups Are the Same Lesson

Nnamdi Felix Ibe

Jul 24

Day 17: Postgres Privileges and IAM Groups Are the Same Lesson

#devops #linux #aws #postgres

3 min read

Cover image for Day 18: MariaDB's Secure Install, and Why 'Read-Only' Needs More Than ec2:Describe

Nnamdi Felix Ibe

Jul 27

Day 18: MariaDB's Secure Install, and Why 'Read-Only' Needs More Than ec2:Describe

#devops #linux #aws #security

3 min read

Cover image for Day 19: Apache Deploys, and a Policy Is Just a Document Until It's Attached

Nnamdi Felix Ibe

Jul 28

Day 19: Apache Deploys, and a Policy Is Just a Document Until It's Attached

#devops #linux #aws #iam

3 min read

Cover image for Day 20: Wiring Nginx to PHP Over a Socket, and Giving EC2 a Role Without Keys

Nnamdi Felix Ibe

Jul 30

Day 20: Wiring Nginx to PHP Over a Socket, and Giving EC2 a Role Without Keys

#devops #linux #aws #nginx

3 min read

Cover image for Day 21: A Bare Git Repo Is the Hub, and an Elastic IP Is the Anchor

Nnamdi Felix Ibe

Aug 1

Day 21: A Bare Git Repo Is the Hub, and an Elastic IP Is the Anchor

#devops #git #aws #linux

3 min read

Cover image for Day 22: Cloning a Repo, and Why Your New EC2 Refuses Your SSH

Nnamdi Felix Ibe

Aug 3

Day 22: Cloning a Repo, and Why Your New EC2 Refuses Your SSH

#devops #aws #git #ssh

3 min read

Cover image for Day 23: A Fork Is Not a Clone, and Sync Is Not a Copy

Nnamdi Felix Ibe

Aug 6

Day 23: A Fork Is Not a Clone, and Sync Is Not a Copy

#git #aws #linux #devops

4 min read

Cover image for Day 24: A Branch Is Just a Pointer, and a Load Balancer Is Three Things

Nnamdi Felix Ibe

Aug 8

Day 24: A Branch Is Just a Pointer, and a Load Balancer Is Three Things

#devops #git #aws #networking

4 min read

Cover image for Day 25: Git Won't Guess, and an Unconfirmed Alarm Never Rings

Nnamdi Felix Ibe

Aug 10

Day 25: Git Won't Guess, and an Unconfirmed Alarm Never Rings

#devops #git #aws #monitoring

4 min read

Cover image for Day 26: Origin Is Just a Nickname, and Localhost Tells the Truth

Nnamdi Felix Ibe

Aug 12

Day 26: Origin Is Just a Nickname, and Localhost Tells the Truth

#devops #git #aws #nginx

11

4 min read

Cover image for Day 27: Undo Isn't a Switch, and Neither Is Public

Nnamdi Felix Ibe

Aug 15

Day 27: Undo Isn't a Switch, and Neither Is Public

#devops #git #aws #vpc

3 min read

Cover image for Day 28: Cherry-Pick Takes One Commit, and the Tag Is the Address

Nnamdi Felix Ibe

Aug 17

Day 28: Cherry-Pick Takes One Commit, and the Tag Is the Address

#devops #git #aws #docker

4 min read

Cover image for Day 29: A Pull Request Needs Two People, and Peering Needs Two Routes

Nnamdi Felix Ibe

Aug 19

Day 29: A Pull Request Needs Two People, and Peering Needs Two Routes

#devops #git #aws #networking

7

5 min read

Cover image for Day 30: Hard Reset Forgets on Purpose, and NAT Needs a Guardrail Switched Off

Nnamdi Felix Ibe

Aug 22

Day 30: Hard Reset Forgets on Purpose, and NAT Needs a Guardrail Switched Off

#devops #git #aws #networking

12

4 min read

Cover image for Day 31: Stash Keeps What Status Won't Show, and Private Is a Flag, Not a Subnet

Nnamdi Felix Ibe

Aug 24

Day 31: Stash Keeps What Status Won't Show, and Private Is a Flag, Not a Subnet

#devops #git #aws #database

9

5 min read

Cover image for Day 32: Rebase Replays Your Commits, and a Restore Inherits Everything You Don't Override

Nnamdi Felix Ibe

Aug 26

Day 32: Rebase Replays Your Commits, and a Restore Inherits Everything You Don't Override

#devops #git #aws #database

8

5 min read

Cover image for Day 33: A Conflict Is Git Refusing to Guess, and Lambda's 200 Isn't the One That Matters

Nnamdi Felix Ibe

Aug 28

Day 33: A Conflict Is Git Refusing to Guess, and Lambda's 200 Isn't the One That Matters

#devops #git #aws #serverless

17

5 min read

Cover image for Day 34: A Hook That Cannot Fail, and an Error Three Commands From Its Cause

Nnamdi Felix Ibe

Sep 1

Day 34: A Hook That Cannot Fail, and an Error Three Commands From Its Cause

#devops #git #aws #serverless

4 min read

Cover image for Day 35: Start and Enable Are Different Promises, and the Slow Thing Goes First

Nnamdi Felix Ibe

Sep 4

Day 35: Start and Enable Are Different Promises, and the Slow Thing Goes First

#devops #docker #aws #database

3

5 min read

Cover image for Day 36: A Running Container Is Not a Published One, and an ALB Needs a Listener

Nnamdi Felix Ibe

Sep 6

Day 36: A Running Container Is Not a Published One, and an ALB Needs a Listener

#devops #docker #aws #networking

3

5 min read

Cover image for Day 37: The Role Is Not What You Attach, and the Bucket Is Not the Objects

Nnamdi Felix Ibe

Sep 8

Day 37: The Role Is Not What You Attach, and the Bucket Is Not the Objects

#devops #docker #aws #security

5 min read

Cover image for Day 38: A Tag Is a Name, Not a Copy, and RUNNING Is Not Reachable

Nnamdi Felix Ibe

Sep 10

Day 38: A Tag Is a Name, Not a Copy, and RUNNING Is Not Reachable

#devops #docker #aws #containers

19

4 min read

Cover image for Day 39: Commit Captures the Layer, Not the Recipe, and AccessDenied Is Not Always IAM

Nnamdi Felix Ibe

Sep 11

Day 39: Commit Captures the Layer, Not the Recipe, and AccessDenied Is Not Always IAM

#devops #docker #aws #s3

5 min read

Cover image for Day 40: Curl's 000 Says Where to Look, and Blackhole Says Exactly What Broke

Nnamdi Felix Ibe

Sep 12

Day 40: Curl's 000 Says Where to Look, and Blackhole Says Exactly What Broke

#devops #docker #aws #networking

18

9

5 min read

Cover image for Day 41: EXPOSE Does Not Publish, and a KMS Key Has No Name

Nnamdi Felix Ibe

Sep 13

Day 41: EXPOSE Does Not Publish, and a KMS Key Has No Name

#devops #docker #aws #security

18

5 min read

Cover image for Day 42: A Custom Network Gives You DNS, and DynamoDB Only Declares Its Key

Nnamdi Felix Ibe

Sep 14

Day 42: A Custom Network Gives You DNS, and DynamoDB Only Declares Its Key

#devops #docker #aws #database

4 min read

Cover image for Day 43: A Port Is Closed Until You Publish It, and an AZ Name Is Not an AZ

Nnamdi Felix Ibe

Sep 16

Day 43: A Port Is Closed Until You Publish It, and an AZ Name Is Not an AZ

#devops #docker #aws #containers

20

4 min read

Cover image for Day 44: Compose Stopped Needing a Version, and the CLI Gives You No Grace Period

Nnamdi Felix Ibe

Sep 18

Day 44: Compose Stopped Needing a Version, and the CLI Gives You No Grace Period

#devops #docker #aws #containers

4 min read

Cover image for Day 45: RUN Cannot See Your Build Context, and NAT Only Goes One Way

Nnamdi Felix Ibe

Sep 19

Day 45: RUN Cannot See Your Build Context, and NAT Only Goes One Way

#devops #docker #aws #networking

12

5 min read

Cover image for Day 46: Compose Wires the Whole Stack, and Permission to Invoke Is Not Permission to Act

Nnamdi Felix Ibe

Sep 20

Day 46: Compose Wires the Whole Stack, and Permission to Invoke Is Not Permission to Act

#devops #docker #aws #serverless

20

5 min read

Cover image for Day 47: Copy Requirements Before the Code, and SQS Has No Priority Feature

Nnamdi Felix Ibe

Sep 21

Day 47: Copy Requirements Before the Code, and SQS Has No Priority Feature

#devops #docker #aws #containers

4 min read

Cover image for Day 48: Nobody Replaces a Bare Pod, and a Stack Knows How to Take Itself Apart

Nnamdi Felix Ibe

Sep 23

Day 48: Nobody Replaces a Bare Pod, and a Stack Knows How to Take Itself Apart

#devops #kubernetes #aws #containers

4 min read

Cover image for Day 49: A Deployment Keeps Pods Alive, and Routable Is Not Reachable

Nnamdi Felix Ibe

Sep 25

Day 49: A Deployment Keeps Pods Alive, and Routable Is Not Reachable

#devops #kubernetes #aws #networking

5 min read

Cover image for Day 50: One Number Picks a Pod's QoS Class, and a Bigger Disk Is Three Separate Jobs

Nnamdi Felix Ibe

Sep 26

Day 50: One Number Picks a Pod's QoS Class, and a Bigger Disk Is Three Separate Jobs

#discuss #devops #kubernetes #aws

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8

5 min read

Cover image for Day 51: A Rollout Only Starts When the Template Changes, and Azure Keeps Only Half Your Key

Nnamdi Felix Ibe

Sep 27

Day 51: A Rollout Only Starts When the Template Changes, and Azure Keeps Only Half Your Key

#devops #kubernetes #azure #security

15

4 min read

Cover image for Day 52: Undo Rolls Forward, and the Disk Already Mounted Is the One Not to Trust

Nnamdi Felix Ibe

Sep 28

Day 52: Undo Rolls Forward, and the Disk Already Mounted Is the One Not to Trust

#devops #kubernetes #azure #containers

19