DevOps Classroomnotes 09/Dec/2022

Elastic Search Installation

• Elastic Stack Architecture
  
• Refer Here for the video for your system setup on Windows.

Configuring your ssh-key as private key

• On your laptop. Launch Powershell/Terminal as Administrator

ssh-keygen

• in your <home-directory>\.ssh => id_rsa (private key) and id_rsa.pub (public key)
• AWS
  • Navigate to the EC2 service
  • Select Key Pairs => Actions => Import Key Pair
    
    
• Azure:
  • Create ssh keys resource
    
    

Steps

• Installation on Ubuntu Refer Here and if you have to use Redhat based linux Refer Here
• Create an ec2 instance as discussed in the classroom
• Now login into ec2 instance
• The installation approach which we are following is apt based Refer Here
• Execute the following commands

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg
sudo apt-get install apt-transport-https
echo "deb [signed-by=/usr/share/keyrings/elasticsearch-keyring.gpg] https://artifacts.elastic.co/packages/8.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-8.x.list
sudo apt-get update && sudo apt-get install elasticsearch -y

• Once we install elastic search

--------------------------- Security autoconfiguration information ------------------------------

Authentication and authorization are enabled.
TLS for the transport and HTTP layers is enabled and configured.

The generated password for the elastic built-in superuser is : BkrPd6l_azZAUGlds*3h

If this node should join an existing cluster, you can reconfigure this with
'/usr/share/elasticsearch/bin/elasticsearch-reconfigure-node --enrollment-token <token-here>'
after creating an enrollment token on your existing cluster.

You can complete the following actions at any time:

Reset the password of the elastic built-in superuser with
'/usr/share/elasticsearch/bin/elasticsearch-reset-password -u elastic'.

Generate an enrollment token for Kibana instances with
 '/usr/share/elasticsearch/bin/elasticsearch-create-enrollment-token -s kibana'.

Generate an enrollment token for Elasticsearch nodes with
'/usr/share/elasticsearch/bin/elasticsearch-create-enrollment-token -s node'.

-------------------------------------------------------------------------------------------------
### NOT starting on installation, please execute the following statements to configure elasticsearch service to start automatically using systemd
 sudo systemctl daemon-reload
 sudo systemctl enable elasticsearch.service
### You can start elasticsearch service by executing
 sudo systemctl start elasticsearch.service

• In the previous versions of elastic search was insecure but in latest versions it is secure by default. Refer Here
• Lets try to start elastic search

sudo systemctl daemon-reload
sudo systemctl enable elasticsearch.service
sudo systemctl start elasticsearch.service
sudo systemctl status elasticsearch.service

* We need to open 9200 port. Lets open this in AWS EC2 security groups

* Elastic search will have configuration files in /etc/elasticsearch
* The configuration file needs to be changed to make this cluster up /etc/elasticsearch/elasticsearch.yml
* We will fix this in the next sesion

• Elastic Search:
  • Is built on top of Apache lucene Refer Here and is written in JAVA
  • Lucene was built to search text from larger docs.