Babatunde Adeyemi barbietunnie

How to Install Let's Encrypt SSL on Ubuntu with Certbot

Install snapd

The apt version of certbot is usually not up-to-date, so it's preferable to install it with snap.

sudo systemctl status snapd

Docker Scout CLI notes

1. Analyze local files

Get an at-a-glance vulnerability summary of the source code in the current working directory
```
docker scout quickview fs://.
```
View the details of vulnerabilities found in your local source code

Find dependent objects for a table or view in Postgresql or Redshift

SELECT dependent_ns.nspname as dependent_schema
, dependent_view.relname as dependent_view 
, source_ns.nspname as source_schema
, source_table.relname as source_table
, pg_attribute.attname as column_name
FROM pg_depend 
JOIN pg_rewrite ON pg_depend.objid = pg_rewrite.oid

RabbitMQ Tips

Installation

Mac

brew update
brew install rabbitmq

How to create a read-only PostgreSQL user

Create a new user in PostgreSQL

CREATE USER <username> WITH PASSWORD '<password>';

GRANT CONNECT access

How to resolve git error: `Unable to append to .git/logs/refs/remotes/origin/master: Permission denied`

It appears git was run locally as root, thus changing the ownership on some of the files tracking the location of the origin branch.

Fixing the file ownership should resolve the issue:

# run this from the root of the git working tree
sudo chown -R "${USER:-$(id -un)}" .

How to resolve MISCONF Redis is configured to save RDB snapshots error

The error "MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error" occurs when Redis tries to save the database in the background but fails.

One of the scenarios where it's known to happen is when redis was recently upgraded by homebrew.

To resolve the issue, ssimply restart your redis instance:

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Ansible Variable Precedence

Here is the order of precedence from least to greatest (the last listed variables override all other variables):

command line values (for example, -u my_user, these are not variables)
role defaults (defined in role/defaults/main.yml) ^[1]
inventory file or script group vars ^[2]
inventory group_vars/all ^[3]
playbook group_vars/all ^[3]
inventory group_vars/* ^[3]

	import javax.crypto.Cipher;
	import javax.crypto.CipherInputStream;
	import javax.crypto.NoSuchPaddingException;
	import javax.crypto.SecretKey;
	import javax.crypto.spec.IvParameterSpec;
	import javax.crypto.spec.SecretKeySpec;
	import java.io.ByteArrayInputStream;
	import java.io.IOException;
	import java.io.InputStream;
	import java.nio.file.Files;