Server Setup on CentOS 7

sudo yum install epel-release
sudo yum install snapd
sudo systemctl enable --now snapd.socket
sudo ln -s /var/lib/snapd/snap /snap

sudo snap install docker
#Now we have successfully installed Docker. We can test it as root
#optional
#Running Docker as normal user
sudo groupadd docker
sudo usermod -aG docker $USER
#after this above steps, require us to relogin
sudo snap disable docker
sudo snap enable docker

sudo rpm --import https://yum.corretto.aws/corretto.key 
sudo curl -L -o /etc/yum.repos.d/corretto.repo https://yum.corretto.aws/corretto.repo
sudo yum install -y java-1.8.0-amazon-corretto-devel

wget https://dlcdn.apache.org/maven/maven-3/3.8.6/binaries/apache-maven-3.8.6-bin.tar.gz -P /tmp
sudo tar xf /tmp/apache-maven-3.6.0-bin.tar.gz -C /opt
sudo ln -s /opt/apache-maven-3.6.0 /opt/maven
sudo vi /etc/profile.d/maven.sh

export JAVA_HOME=/usr/lib/jvm/jre
export M2_HOME=/opt/maven
export MAVEN_HOME=/opt/maven
export PATH=${M2_HOME}/bin:${PATH}

sudo chmod +x /etc/profile.d/maven.sh
source /etc/profile.d/maven.sh

# Download the binary for your system
sudo curl -L --output /usr/local/bin/gitlab-runner https://gitlab-runner-downloads.s3.amazonaws.com/latest/binaries/gitlab-runner-linux-amd64

# Give it permissions to execute
sudo chmod +x /usr/local/bin/gitlab-runner

# Create a GitLab CI user
sudo useradd --comment 'GitLab Runner' --create-home gitlab-runner --shell /bin/bash

# Create symlink
sudo ln -s /usr/local/bin/gitlab-runner /usr/bin/gitlab-runner

# Install and run as service
sudo gitlab-runner install --user=gitlab-runner --working-directory=/home/gitlab-runner
sudo gitlab-runner start