Datadog Session – Notes – April 2026

Day 2

=======================================================================================================

									Observability
										MELT Collect
=======================================================================================================
Metrics										LogS									Trace
=======================================================================================================
Datadog Agent									Datadog Agent							APM - Datadog APM Agent(Code)
																				San - No Agent... Client call from Datadog
																				RUM - js in your web/app
=======================================================================================================
Platfrom
- Server (Linux + Win)/ Linux(DONE)			LINUX LOGS								App Performance from Code				
- Container/Docker/- Docker					DOCKER LOGS							Uptime/healthcheck  from Endpoint 				
- Kuberestes								APP LOGS									RUM	from Web/App
- Cloud AWS/Azure/GC						Network logs

Web server			- Apache
		Apache
		nginx
		IIS
App Server			- Tomcat
		Tomcat
		jboss
		web logic
		web she
Db server			- mysql
		mysql
		oracle
		post

=======================		======================================					==========================
Infra monitoring							logs monitoring							App perf monitoring
Network Monitoring																	Syntectic monitoring
																					real user monitoring	
============================================================================================================
												Exploring
==============================================================================================================
												Alerts Aka Monitor
==============================================================================================================
												Dashboard
===============================================================================================================
												Reports



Qs - How to monitor Docker Containers using Datadog using datadog agent?
https://www.devopsschool.com/blog/how-to-enable-docker-container-monitoring-in-datadog-agent/

Step 1 - Get a VM, and Install DataDog agent - DONE
Step 2 - Install Docker and Run Containers
Step 3 - Enable Process Monitoring in DataDog Agent & Restart datadog agent
Step 4 - Enable Datadog Integration(Fresh Account) and Configure Datadog
Step 5 - Check the container metrics at DataDog.
==========================================================================

What is Docker?

What is Container?

Physical ServerS			==>	VMs				===> Container
================	=============================	============================
						hypervisors				Docker

How to create a vm using virtual box?



Docker


Kubernetes



Step 1 - Get a VM, and Install DataDog agent - DONE
How to install datadog agent in Ubuntu Linux?



Step 2 - Install Docker and Run Containers
Docker Tutorials: How to Install Docker in Ubuntu?


$ sudo apt-get update
$ sudo apt-get install ca-certificates curl gnupg lsb-release

# Add Docker’s official GPG key:
$ sudo mkdir -p /etc/apt/keyrings
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

# Use the following command to set up the repository:
$  echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker Engine
$ sudo apt-get update
$ sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin
$ sudo docker ps
$ sudo docker run -itd httpd
$ sudo docker run -itd httpd
$ sudo docker run -itd httpd
$ sudo docker ps

Step 3 - Enable Process Monitoring in DataDog Agent & Restart datadog agent
How to enable Live Process monitoring in Datadog Agent?


# need to edit "Process Collection Configuration" Section
vi /etc/datadog-agent/datadog.yaml

Refer - https://www.devopsschool.com/blog/wp-content/uploads/2022/08/image-24.png


$ systemctl restart datadog-agent
$ systemctl status datadog-agent

# Verify Process


Step 4 - Enable Datadog Integration(Fresh Account) and Configure Datadog - PENDING
Step 5 - Check the container metrics at DataDog.  - PENDING

How to monitor Apache using Datadog?
https://www.devopsschool.com/blog/datadog-tutorials-how-to-monitor-apache-using-datadog-in-windows/
How to install & configure Datadog Integration with Apache HTTPD?




Step 1 -> Install Apache
Step 2 -> Enable Apache to expose metrices

Step 3 -> enable Apache Integration at Datadog

Step 4 -> Enable Apache config at Datadog Config

Step 5 -> restart a agent

Step 6 - Validate a metices

Ubuntu - package - apache2
Centosr/- package httpd


60  apt install apache2
   61  clear
   62  ls
   63  clear
   64  ls
   65  clear
   66  sudo /usr/sbin/a2enmod status
   67  clear
   68  ls
   69  cd /etc/datadog-agent/conf.d/
   70  ls
   71  cd apache.d
   72  ls
   73  cp conf.yaml.example conf
   74  clear
   75  ls
   76  mv conf.yaml.example conf.yaml
   77  ls
   78  more conf.yaml
   79  vi conf.yaml 
   80  cler
   81  clear
   82  systemctl restart datadog-agent
   83  datadog-agent status
   84  systemctl start apache2
   85  systemctl restart datadog-agent
   86  datadog-agent status
   87  curl http://172.17.0.2/server-status?auto
   88  curl http://localhost/server-status?auto
   89  clear
   90  ls
   91  rm -rf conf
   92  ls
   93  clear
   94  ls
   95  vi conf.yaml 
   96  more auto_conf.yaml 
   97  clear
   98  ip a
   99  clear
  100  ls
  101  systemctl restart datadog-agent
  102  systemctl status datadog-agent
  103  datadog-agent status
  104  datadog-agent status | grep apache
  105  clear
  106  ls
  107  history

Day 3

==============================================================================================
==============================================================================================
How to Monitor Java Based App Server? Tomcat using Datadog Agent
https://www.devopsschool.com/blog/how-to-enable-apache-tomcat-monitoring-in-datadog-agent/
==============================================================
Step 1 - Get a VM and Install Datadog Agent - Completed

Step 2 - Install JDK 
Java Installation Guide in Linux & Windows


$ sudo apt update
$ sudo apt install openjdk-17-jdk
$ sudo apt install openjdk-17-jre
$ java --version

Step 3 - Install Tomcat
Tomcat Install and Configuration Tutorial and Guide



$ cd /opt/
$ ls
$ wget https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.117/bin/apache-tomcat-9.0.117.zip
$ apt install unzip
$ unzip apache-tomcat-9.0.117.zip
$ cd apache-tomcat-9.0.117
$ cd bin/
$ ls
$ chmod -R 755 .
$ ls
$ pwd
$ ./startup.sh
$ ps -eaf | grep tomcat

Step 4 - Configure DD Agent with Tomcat & Datadog --->
- Go to Integration and Enable Tomcat	DONE
- get a config and follow the steps

$ cd /etc/datadog-agent/conf.d/
$ ls
$ cd tomcat.d/
$ ls
$ cp conf.yaml.example conf.yaml


How to enable JMX in tomcat
==============================
$ cd /opt/apache-tomcat-9.0.117/bin
$ vi setenv.sh
CATALINA_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9012 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false"
$ chmod 755 setenv.sh
$ ./shutdown.sh
$ ./startup.sh 

- DONT forget to restart Datadog

Step 5 - validate tomcat metrics at Datadog
$ systemctl restart datadog-agent
$ datadog-agent status

How to setup APM using Datadog for Java Applications?
=====================================================
https://www.devopsschool.com/blog/how-to-setup-datadog-apm-for-java-application-running-with-tomcat/



Step 1 - get a vms and install DataDogAgent - DONE
Step 2 - Install JDK - DOEN
Step 3 - Install Tomcat - DONE

Step 4 - Deploy an Application to Tomcat - DONE

Step 5 - Configure APM AGENT for an app/tomcat
$ cd /opt
$ mkdir apm
$ cd apm
$ wget -O dd-java-agent.jar 'https://dtdg.co/latest-java-tracer'
$ cd /opt/apache-tomcat-9.0.117/bin/
$ vi setenv.sh 
CATALINA_OPTS="$CATALINA_OPTS -javaagent:/opt/apm/dd-java-agent.jar -Ddd.profiling.enabled=true -Ddd.logs.injection=true -Ddd.trace.sample.rate=1 -Ddd.service=chat -Ddd.env=prod -Ddd.version=1.1"

$ 

$ chmod -R 777 /opt/apm

CATALINA_OPTS="$CATALINA_OPTS -javaagent:/opt/apm/dd-java-agent.jar -Ddd.profiling.enabled=true -Ddd.logs.injection=true -Ddd.trace.sample.rate=1 -Ddd.service=chat -Ddd.env=prod -Ddd.version=1.1"
 

$ ./shutdown.sh
$ ./startup.sh

Note - vi /opt/apache-tomcat-9.0.117/webapps/examples/META-INF/context.xml

Step 6 - use An Application

Step 7 - Check the trace at DATADOG AND FINDOUT CULPRIT.

Day 4

==================================
How to collect using Datadog Agent?
https://www.devopsschool.com/blog/datadog-tutorials-log-collection-process-configuration/
Datadog Log: Lab and Assignment

Datadog Tutorials: Send log to Datadog using api through telnet and curl

https://www.devopsschool.com/slides/datadog/datadog-log-monitoring/index.html#/home

Step 1 - Identify the logs which you want to monitor?
/var/log/apache2/access.log
/var/log/apache2/error.log
/var/log/syslog

Step 2 - Install DD agent & Enable logs_enabled: true in datadog.yaml

Step 3 - Create a log config under Datadog

$ cd /etc/datadog-agent/conf.d
$ mkdir custom_log_collection.d
$ vi custom_log_collection.d/conf.yaml

logs:
    - type: file
      path: /var/log/apache2/access.log
      source: apache
      service: apache
    - type: file
      path: /var/log/apache2/error.log
      source: apache
      service: apache
    - type: file
      path: /var/log/syslog
      source: syslog
      service: syslog


$ chown -R dd-agent:dd-agent custom_log_collection.d
$ chmod -R 755 /var/log/

Step 4 - Restart agent

Step 5 - explorer logs at DD