VM.Standard.A1.Flex shape (Arm-based Ampere A1 Compute): Because the VM.Standard.A1.Flex shape is a flexible shape, you can customize the number of OCPUs and amount of memory that are allocated when you create or resize an instance. You can use all of the Always Free OCPUs and memory to create a single instance, or create multiple smaller instances that each use a portion of the resources.
Processor: 4 OCPUs total, which you can allocate flexibly
Memory: 24 GB total, which you can allocate flexibly
Networking: The network bandwidth and number of VNICs scale proportionately with the number of OCPUs. For details, see Flexible Shapes.
Image: Your choice of one of the following Always Free-eligible images:

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wget http://amh.sh/amh.sh && bash amh.sh acc 37332 

wget http://amh.sh/amh.sh && bash amh.sh gcc 37332

cat >/etc/yum.repos.d/centos-extras.repo << 'EOF'
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=7&arch=$basearch&repo=extras&infra=$infra
gpgcheck=0
EOF



sudo yum install -y yum-utils

sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
    
sudo yum install docker-ce docker-ce-cli containerd.io

systemctl start docker

echo "net.ipv6.conf.all.disable_ipv6=0" >> /etc/sysctl.conf
sysctl -p
dhclient -6 enp0s3
ip addr