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How to create a read-only PostgreSQL user

1. Create a new user in PostgreSQL

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

2. GRANT CONNECT access

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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)}" .

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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:

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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Ansible Variable Precedence

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

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

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import os
ROOT_DIR = os.path.realpath(os.path.join(os.path.dirname(__file__), '..'))

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How to fix – Nginx not accepting headers with underscore

Although headers with underscore are perfectly valid according to HTTP standards, however NGINX does not support it by default. To enable NGINX to accept headers with underscore, add the following directive within the server block of your NGINX configuration.

underscores_in_headers on;

Validate and reload the configuration after making this change as follows:

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How to determine the user and group of a daemon in Ubuntu

The situation occasionally arises when you need to determine the user and group a daemon such as nginx is running as on Ubuntu, you can basically run the following command:

ps aux|grep nginx|grep -v grep

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from django.core.management.utils import get_random_secret_key

print(get_random_secret_key())

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How to dump file contents to console with Ansible

-  name: Display content of resolv.conf
  hosts: localhost
  tasks:
    - name: Display resolv.conf contents
      command: cat resolv.conf chdir=/etc
      register: command_output