Wednesday, August 3, 2022

#Install #docker on #Centos7, #Centos9, #Ubuntu20

Tested OSs: Centos7, Centos9 and Ubuntu 20

Step-1 (Optional)

*Note: Ignore this step, if you are not in installing docker in the University of Tartu's private cloud

- Create the daemon file manually. This is because of some conflict in University's Openstack Environment.

sudo mkdir -p /etc/docker && cd /etc/docker

- Create and update docker daemon file

sudo tee /etc/docker/daemon.json <<EOF
{
	
"default-address-pools": [{"base":"172.80.0.0/16","size":24}]
}
EOF

Step-2

Now run this command. It will add the official Docker repository, download the latest version of Docker, and install it:

curl -fsSL https://get.docker.com/ | sh

After installation has completed, start the Docker daemon:

sudo systemctl start docker

Verify that it’s running:

sudo systemctl status docker

Enable docker

    sudo systemctl enable docker

Step-3

To run docker commands with non-root privileges

Create a docker group (If it's already created then ignore): sudo groupadd docker
Add a user to docker group: sudo usermod -aG docker $USER
Activate the changes: newgrp docker
Check the installation by displaying docker version: docker --version

- That's all for now.

Monday, June 20, 2022

Installing #neo4j on #centos 9 using #docker and accessing from #remote...

In this post, you will see how to install neo4j graphDB on a remote with no GUI access. We will install this db on centos9 OS and access the web-based GUI on local machine.

Steps:

Login to the remote VM using ssh -i <keyfile> centos@<ip of the VM> command
Create following directories

mkdir neo4j && cd neo4j
mkdir -p data logs import plugins

Execute following docker command to download and run neo4j docker image

docker run \
    -d
    --restart always \
    --publish=7474:7474 --publish=7687:7687 \
    --env NEO4J_AUTH=neo4j/test \
    --user="$(id -u):$(id -g)" \
    --volume=$HOME/neo4j/data:/data \
    -v $HOME/neo4j/logs:/logs \
    -v $HOME/neo4j/import:/var/lib/neo4j/import \
    -v $HOME/neo4j/plugins:/plugins \
    neo4j:latest

Now in the local machine, open your terminal or command prompt and execute the following command

ssh -i <keyfile> -N -f -L localhost:7474:localhost:7474 centos@<Remote VM ip>

Now open any web browser and enter following address

http://localhost:7474

In the below video, you can get the detailed steps for more better clarity. Please reach out to me https://kodu.ut.ee/~dehury/ if you have any confusion.