source/soca/cluster_manager/cloudformation_builder.py [137:247]:
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if [[ "$FS_DATA_PROVIDER" == "fsx_lustre" ]] || [[ "$FS_APPS_PROVIDER" == "fsx_lustre" ]]; then
    if [[ -z "$(rpm -qa lustre-client)" ]]; then
        # Install FSx for Lustre Client
        if [[ "$SOCA_BASE_OS" == "amazonlinux2" ]]; then
            amazon-linux-extras install -y lustre2.10
        else
            kernel=$(uname -r)
            machine=$(uname -m)
            echo "Found kernel version: $kernel running on: $machine"
            yum -y install wget
            if [[ $kernel == *"3.10.0-957"*$machine ]]; then
                yum -y install https://downloads.whamcloud.com/public/lustre/lustre-2.10.8/el7/client/RPMS/x86_64/kmod-lustre-client-2.10.8-1.el7.x86_64.rpm
                yum -y install https://downloads.whamcloud.com/public/lustre/lustre-2.10.8/el7/client/RPMS/x86_64/lustre-client-2.10.8-1.el7.x86_64.rpm
            elif [[ $kernel == *"3.10.0-1062"*$machine ]]; then
                wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                rpm --import /tmp/fsx-rpm-public-key.asc
                wget https://fsx-lustre-client-repo.s3.amazonaws.com/el/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                sed -i 's#7#7.7#' /etc/yum.repos.d/aws-fsx.repo
                yum clean all
                yum install -y kmod-lustre-client lustre-client
            elif [[ $kernel == *"3.10.0-1127"*$machine ]]; then
                wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                rpm --import /tmp/fsx-rpm-public-key.asc
                wget https://fsx-lustre-client-repo.s3.amazonaws.com/el/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                sed -i 's#7#7.8#' /etc/yum.repos.d/aws-fsx.repo
                yum clean all
                yum install -y kmod-lustre-client lustre-client
            elif [[ $kernel == *"3.10.0-1160"*$machine ]]; then
                wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                rpm --import /tmp/fsx-rpm-public-key.asc
                wget https://fsx-lustre-client-repo.s3.amazonaws.com/el/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                yum clean all
                yum install -y kmod-lustre-client lustre-client
            elif [[ $kernel == *"4.18.0-193"*$machine ]]; then
                # FSX for Lustre on aarch64 is supported only on 4.18.0-193
                wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                rpm --import /tmp/fsx-rpm-public-key.asc
                wget https://fsx-lustre-client-repo.s3.amazonaws.com/centos/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                yum clean all
                yum install -y kmod-lustre-client lustre-client
            else
                echo "ERROR: Can't install FSx for Lustre client as kernel version: $kernel isn't matching expected versions: (x86_64: 3.10.0-957, -1062, -1127, -1160, aarch64: 4.18.0-193)!"
            fi
        fi
    fi
fi

if [[ "$FS_DATA_PROVIDER" == "efs" ]]; then
    echo "$FS_DATA:/ /data nfs4 nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 0 0" >> /etc/fstab
elif [[ "$FS_DATA_PROVIDER" == "fsx_lustre" ]]; then
    FSX_ID=$(echo $FS_DATA | cut -d. -f1)
    FSX_DATA_MOUNT_NAME=$($AWS fsx describe-file-systems --file-system-ids $FSX_ID  --query FileSystems[].LustreConfiguration.MountName --output text)
    echo "$FS_DATA@tcp:/$FSX_DATA_MOUNT_NAME /data lustre defaults,noatime,flock,_netdev 0 0" >> /etc/fstab
fi

if [[ "$FS_APPS_PROVIDER" == "efs" ]]; then
    echo "$FS_APPS:/ /apps nfs4 nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 0 0" >> /etc/fstab
elif [[ "$FS_APPS_PROVIDER" == "fsx_lustre" ]]; then
    FSX_ID=$(echo $FS_APPS | cut -d. -f1)
    FSX_APPS_MOUNT_NAME=$($AWS fsx describe-file-systems --file-system-ids $FSX_ID  --query FileSystems[].LustreConfiguration.MountName --output text)
    echo "$FS_APPS@tcp:/$FSX_APPS_MOUNT_NAME /apps lustre defaults,noatime,flock,_netdev 0 0" >> /etc/fstab
fi

FS_MOUNT=0
mount -a 
while [[ $? -ne 0 ]] && [[ $FS_MOUNT -lt 5 ]]
do
    SLEEP_TIME=$(( RANDOM % 60 ))
    echo "Failed to mount FS, retrying in $SLEEP_TIME seconds and Loop $FS_MOUNT/5..."
    sleep $SLEEP_TIME
    ((FS_MOUNT++))
    mount -a
done

# Configure Chrony
yum remove -y ntp
yum install -y chrony
mv /etc/chrony.conf  /etc/chrony.conf.original
echo -e """
# use the local instance NTP service, if available
server 169.254.169.123 prefer iburst minpoll 4 maxpoll 4

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
# !!! [BEGIN] SOCA REQUIREMENT
# You will need to open UDP egress traffic on your security group if you want to enable public pool
#pool 2.amazon.pool.ntp.org iburst
# !!! [END] SOCA REQUIREMENT
# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift

# Allow the system clock to be stepped in the first three updates
# if its offset is larger than 1 second.
makestep 1.0 3

# Specify file containing keys for NTP authentication.
keyfile /etc/chrony.keys

# Specify directory for log files.
logdir /var/log/chrony

# save data between restarts for fast re-load
dumponexit
dumpdir /var/run/chrony
""" > /etc/chrony.conf
systemctl enable chronyd

# Prepare  Log folder
mkdir -p $SOCA_HOST_SYSTEM_LOG
echo "@reboot /bin/bash /apps/soca/$SOCA_CONFIGURATION/cluster_node_bootstrap/ComputeNodePostReboot.sh >> $SOCA_HOST_SYSTEM_LOG/ComputeNodePostReboot.log 2>&1" | crontab -
cp /apps/soca/$SOCA_CONFIGURATION/cluster_node_bootstrap/config.cfg /root/
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source/soca/cluster_web_ui/api/v1/dcv/create_linux_desktop.py [282:392]:
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            if [[ "$FS_DATA_PROVIDER" == "fsx_lustre" ]] || [[ "$FS_APPS_PROVIDER" == "fsx_lustre" ]]; then
                if [[ -z "$(rpm -qa lustre-client)" ]]; then
                    # Install FSx for Lustre Client
                    if [[ "$SOCA_BASE_OS" == "amazonlinux2" ]]; then
                        amazon-linux-extras install -y lustre2.10
                    else
                        kernel=$(uname -r)
                        machine=$(uname -m)
                        echo "Found kernel version: $kernel running on: $machine"
                        yum -y install wget
                        if [[ $kernel == *"3.10.0-957"*$machine ]]; then
                            yum -y install https://downloads.whamcloud.com/public/lustre/lustre-2.10.8/el7/client/RPMS/x86_64/kmod-lustre-client-2.10.8-1.el7.x86_64.rpm
                            yum -y install https://downloads.whamcloud.com/public/lustre/lustre-2.10.8/el7/client/RPMS/x86_64/lustre-client-2.10.8-1.el7.x86_64.rpm
                        elif [[ $kernel == *"3.10.0-1062"*$machine ]]; then
                            wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                            rpm --import /tmp/fsx-rpm-public-key.asc
                            wget https://fsx-lustre-client-repo.s3.amazonaws.com/el/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                            sed -i 's#7#7.7#' /etc/yum.repos.d/aws-fsx.repo
                            yum clean all
                            yum install -y kmod-lustre-client lustre-client
                        elif [[ $kernel == *"3.10.0-1127"*$machine ]]; then
                            wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                            rpm --import /tmp/fsx-rpm-public-key.asc
                            wget https://fsx-lustre-client-repo.s3.amazonaws.com/el/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                            sed -i 's#7#7.8#' /etc/yum.repos.d/aws-fsx.repo
                            yum clean all
                            yum install -y kmod-lustre-client lustre-client
                        elif [[ $kernel == *"3.10.0-1160"*$machine ]]; then
                            wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                            rpm --import /tmp/fsx-rpm-public-key.asc
                            wget https://fsx-lustre-client-repo.s3.amazonaws.com/el/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                            yum clean all
                            yum install -y kmod-lustre-client lustre-client
                        elif [[ $kernel == *"4.18.0-193"*$machine ]]; then
                            # FSX for Lustre on aarch64 is supported only on 4.18.0-193
                            wget https://fsx-lustre-client-repo-public-keys.s3.amazonaws.com/fsx-rpm-public-key.asc -O /tmp/fsx-rpm-public-key.asc
                            rpm --import /tmp/fsx-rpm-public-key.asc
                            wget https://fsx-lustre-client-repo.s3.amazonaws.com/centos/7/fsx-lustre-client.repo -O /etc/yum.repos.d/aws-fsx.repo
                            yum clean all
                            yum install -y kmod-lustre-client lustre-client
                        else
                            echo "ERROR: Can't install FSx for Lustre client as kernel version: $kernel isn't matching expected versions: (x86_64: 3.10.0-957, -1062, -1127, -1160, aarch64: 4.18.0-193)!"
                        fi
                    fi
                fi
            fi

            if [[ "$FS_DATA_PROVIDER" == "efs" ]]; then
                echo "$FS_DATA:/ /data nfs4 nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 0 0" >> /etc/fstab
            elif [[ "$FS_DATA_PROVIDER" == "fsx_lustre" ]]; then
                FSX_ID=$(echo $FS_DATA | cut -d. -f1)
                FSX_DATA_MOUNT_NAME=$($AWS fsx describe-file-systems --file-system-ids $FSX_ID  --query FileSystems[].LustreConfiguration.MountName --output text)
                echo "$FS_DATA@tcp:/$FSX_DATA_MOUNT_NAME /data lustre defaults,noatime,flock,_netdev 0 0" >> /etc/fstab
            fi

            if [[ "$FS_APPS_PROVIDER" == "efs" ]]; then
                echo "$FS_APPS:/ /apps nfs4 nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport 0 0" >> /etc/fstab
            elif [[ "$FS_APPS_PROVIDER" == "fsx_lustre" ]]; then
                FSX_ID=$(echo $FS_APPS | cut -d. -f1)
                FSX_APPS_MOUNT_NAME=$($AWS fsx describe-file-systems --file-system-ids $FSX_ID  --query FileSystems[].LustreConfiguration.MountName --output text)
                echo "$FS_APPS@tcp:/$FSX_APPS_MOUNT_NAME /apps lustre defaults,noatime,flock,_netdev 0 0" >> /etc/fstab
            fi

            FS_MOUNT=0
            mount -a 
            while [[ $? -ne 0 ]] && [[ $FS_MOUNT -lt 5 ]]
            do
                SLEEP_TIME=$(( RANDOM % 60 ))
                echo "Failed to mount FS, retrying in $SLEEP_TIME seconds and Loop $FS_MOUNT/5..."
                sleep $SLEEP_TIME
                ((FS_MOUNT++))
                mount -a
            done
                
            # Configure Chrony
            yum remove -y ntp
            yum install -y chrony
            mv /etc/chrony.conf  /etc/chrony.conf.original
            echo -e """
            # use the local instance NTP service, if available
            server 169.254.169.123 prefer iburst minpoll 4 maxpoll 4
    
            # Use public servers from the pool.ntp.org project.
            # Please consider joining the pool (http://www.pool.ntp.org/join.html).
            # !!! [BEGIN] SOCA REQUIREMENT
            # You will need to open UDP egress traffic on your security group if you want to enable public pool
            #pool 2.amazon.pool.ntp.org iburst
            # !!! [END] SOCA REQUIREMENT
            # Record the rate at which the system clock gains/losses time.
            driftfile /var/lib/chrony/drift
    
            # Allow the system clock to be stepped in the first three updates
            # if its offset is larger than 1 second.
            makestep 1.0 3
    
            # Specify file containing keys for NTP authentication.
            keyfile /etc/chrony.keys
    
            # Specify directory for log files.
            logdir /var/log/chrony
    
            # save data between restarts for fast re-load
            dumponexit
            dumpdir /var/run/chrony
            """ > /etc/chrony.conf
    
            systemctl enable chronyd
            # Prepare  Log folder
            mkdir -p $SOCA_HOST_SYSTEM_LOG
            echo "@reboot /bin/bash /apps/soca/$SOCA_CONFIGURATION/cluster_node_bootstrap/ComputeNodePostReboot.sh >> $SOCA_HOST_SYSTEM_LOG/ComputeNodePostReboot.log 2>&1" | crontab -
            cp /apps/soca/$SOCA_CONFIGURATION/cluster_node_bootstrap/config.cfg /root/
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