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Logging vs Tracing vs Metrics

Logging, Tracing, Metrics

Logging, tracing, and metrics are 3 pillars of system observability.

Logging

Logging records discrete events in the system. For example, we can record an incoming request or a visit to databases as events. It has the highest volume. ELK (Elastic-Logstash-Kibana) stack is often used to build a log analysis platform. We often define a standardized logging format for different teams to implement, so that we can leverage keywords when searching among massive amounts of logs.

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Extending AWS EC2 Instance Storage

This guide explains how to extend the storage of an AWS EC2 instance's root partition and resize the filesystem to utilize the additional space.

Prerequisites

• An AWS EC2 instance with an EBS volume.
• SSH access to the EC2 instance.

Steps

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The best way to handle environment variables in React Native is to use the react-native-config library.

Here are the steps:

1. Install the library

npm install react-native-config

Or if you use Yarn:

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You can run this command in a shell from the directory that you want to get the names of the folder into a csv.

find . -maxdepth 1 -type d -name "MA*" | sed 's|./||' > folder-names.csv

What this does is it looks for any directories ('-type d') within your current location ('.') that start with 'MA' ('-name "MA"')*. The '-maxdepth 1' part just means we're only looking at the top level, and not diving down into subdirectories.

Once those directories are found, we strip out the './' at the beginning of each folder name using 'sed', and then we put all of these names into a file called 'folder-names.csv'

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Creating a File:

1. Create a new file under /etc/cron.daily/ named "autoupdate"

   root@dashboard:/home/linuxadmin# vim /etc/cron.daily/autoupdate

2. Paste the following script into the file:

OS Update with Dist-upgrade

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```
server {
    listen 80;
    server_name SUB_DOMAIN.DOMAIN.com;
    return 301 https://$host$request_uri;
}


upstream backend {
    server EC2_Private_IPv4:APP_PORT;  # In-house test server

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Mongodb has two very useful commands for this purpose: mongodump and mongorestore. Here's how to use them:

1. mongodump: It is a utility for creating a binary export of the contents of a database. Basically, using this command you can export MongoDb database.

   Use the following command to dump your local database:

   mongodump --db <your_database_name> --out <directory_path>
   

   For example:

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// Clear chrome sync storage
chrome.storage.sync.clear(() => {
  console.log('Chrome sync storage has been cleared.');
});

// Clear chrome local storage
chrome.storage.local.clear(() => {
  console.log('Chrome local storage has been cleared.');
});

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Setup Kubernetes Cluster On-Premise using kubeadm

Why would you do this?

• You own your bare metal infrastructure.
• You want to take advantage of Kubernetes.
• You do not wish to migrate your application to the cloud

Why it will not always suit your needs?

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• Import from URI
• Enable your current IP in network access
• In the Robo3t connection settings, change TLS authentication method to Self Signed Certificate