Step 1: Update Your System

Make sure that your system is updated before starting the installation.

sudo apt update && sudo apt upgrade -y

Reboot your system if needed.

sudo reboot

And then install the other required packages by typing.

sudo apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common -y

After resolving the dependencies, move towards the next step.

Step 2: Install Docker & Docker Compose on Ubuntu 20.04

To install docker on Ubuntu 20.04, add the repostiory & then install the latest version as latest version is not present on Ubuntu default repository.

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

After adding the repo hit the below command to install the docker & docker compose.

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose -y

Verify the status by typing

sabi@Ubuntu20:~$ sudo systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor prese>
Active: active (running) since Tue 2020-12-01 11:24:04 PKT; 23s ago
TriggeredBy: ● docker.socket
Docs: https://docs.docker.com
Main PID: 40347 (dockerd)
Tasks: 13
Memory: 48.9M
CGroup: /system.slice/docker.service
└─40347 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/co>
دسمبر 01 11:24:01 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:01.635102089>
دسمبر 01 11:24:01 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:01.635109806>
دسمبر 01 11:24:01 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:01.635117110>
دسمبر 01 11:24:01 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:01.635344751>
دسمبر 01 11:24:03 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:03.538423340>
دسمبر 01 11:24:03 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:03.870371403>
دسمبر 01 11:24:04 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:04.205068138>
دسمبر 01 11:24:04 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:04.205249608>
دسمبر 01 11:24:04 Ubuntu20 systemd[1]: Started Docker Application Container En>
دسمبر 01 11:24:04 Ubuntu20 dockerd[40347]: time="2020-12-01T11:24:04.245907850>
lines 1-21/21 (END)

See the installed version of docker by running

sabi@Ubuntu20:~$ docker -v
Docker version 19.03.13, build 4484c46d9d

For docker compose

sabi@Ubuntu20:~$ docker-compose -v
docker-compose version 1.25.0, build unknown

Step 3: Install OpenNMS On Ubuntu 20.04

Run the given command to create a project folder for OpenNMS.

sudo mkdir opennms

Now, switch to the created directory & create a new docker-compose.yml file in order to install OpenNMS.

cd opennms
sudo nano docker-compose.yml

Paste the below content into the file.

version: '3'
volumes:
data-postgres: {}
data-opennms: {}
services:
database:
image: postgres:12
container_name: database
environment:
- TZ=Europe/Berlin
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
volumes:
- data-postgres:/var/lib/postgresql/data
healthcheck:
test: [ "CMD-SHELL", "pg_isready -U postgres" ]
interval: 10s
timeout: 30s
retries: 3
horizon:
image: opennms/horizon:26.1.1
container_name: horizon
environment:
- TZ=Europe/Berlin
- POSTGRES_HOST=database
- POSTGRES_PORT=5432
- POSTGRES_USER=postgres
- POSTGRES_PASSWORD=postgres
- OPENNMS_DBNAME=opennms
- OPENNMS_DBUSER=opennms
- OPENNMS_DBPASS=opennms
volumes:
- data-opennms:/opt/opennms/share/rrd
- ./overlay:/opt/opennms-overlay
command: ["-s"]
ports:
- "8980:8980/tcp"
- "8101:8101/tcp"
- "61616:61616/tcp"
healthcheck:
test: [ "CMD", "curl", "-f", "-I", "http://localhost:8980/opennms/login.jsp" ]
interval: 1m
timeout: 5s
retries: 3

Save & exit the file. Then hit the given command to download & build the container for opennms.

sudo docker-compose up -d

Check the running container by typing

sudo docker ps -a

Output:

sabi@Ubuntu20:~/opennms$ sudo docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a77e102ae833 opennms/horizon:26.1.1 "/entrypoint.sh -s" 17 minutes ago Up 18 seconds (health: starting) 0.0.0.0:8101->8101/tcp, 1162/udp, 0.0.0.0:8980->8980/tcp, 10514/udp, 0.0.0.0:61616->61616/tcp horizon
c4716857deef postgres:12 "docker-entrypoint.s…" 17 minutes ago Up 19 seconds (healthy) 5432/tcp database

Step 4: Accessing OpenNMS Via Web

Go to your favourite browser and access the OpenNMS by typing http://your-server-ip:8980. You’ll see the login page. Provide default credentails to login.

User:admin
Pass:admin

You’ll be redirected to the dashboard. Now, click on the “+” icon on the top right side to add new server node(device to be monitored).

Give it a name & press “OK”. You’ll see the similar screen.

Now, fill the required fields to add the new device to be monitored.

You’ll see a success message once added. Press “Ok” button

And navigate to the Info>>>Nodes to see the new device added.

So, this is how you can install OpenNMS on Ubuntu 20.04

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