diff --git a/library/utils.sh b/library/utils.sh
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--- /dev/null
+++ b/library/utils.sh
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+#######################################################################################
+# Copyright ETSI Contributors and Others.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#######################################################################################
+
+
+function setup_external_ip() {
+    echo "Determining IP address of the interface with the default route"
+    [ -z "$OSM_DEFAULT_IF" ] && OSM_DEFAULT_IF=$(ip route list|awk '$1=="default" {print $5; exit}')
+    [ -z "$OSM_DEFAULT_IF" ] && OSM_DEFAULT_IF=$(route -n |awk '$1~/^0.0.0.0/ {print $8; exit}')
+    [ -z "$OSM_DEFAULT_IF" ] && FATAL "Not possible to determine the interface with the default route 0.0.0.0"
+    OSM_DEFAULT_IP=`ip -o -4 a s ${OSM_DEFAULT_IF} |awk '{split($4,a,"/"); print a[1]; exit}'`
+    [ -z "$OSM_DEFAULT_IP" ] && FATAL "Not possible to determine the IP address of the interface with the default route"
+    OSM_K8S_EXTERNAL_IP=${OSM_K8S_EXTERNAL_IP:-${OSM_DEFAULT_IP}}
+}
+
+function parse_docker_registry_url() {
+    DOCKER_REGISTRY_USER=$(echo "$1" | awk '{split($1,a,"@"); split(a[1],b,":"); print b[1]}')
+    DOCKER_REGISTRY_PASSWORD=$(echo "$1" | awk '{split($1,a,"@"); split(a[1],b,":"); print b[2]}')
+    DOCKER_REGISTRY_URL=$(echo "$1" | awk '{split($1,a,"@"); print a[2]}')
+}
+
+function configure_apt_proxy() {
+    OSM_APT_PROXY=$1
+    OSM_APT_PROXY_FILE="/etc/apt/apt.conf.d/osm-apt"
+    echo "Configuring apt proxy in file ${OSM_APT_PROXY_FILE}"
+    if [ ! -f ${OSM_APT_PROXY_FILE} ]; then
+        sudo bash -c "cat <<EOF > ${OSM_APT_PROXY}
+Acquire::http { Proxy \"${OSM_APT_PROXY}\"; }
+EOF"
+    else
+        sudo sed -i "s|Proxy.*|Proxy \"${OSM_APT_PROXY}\"; }|" ${OSM_APT_PROXY_FILE}
+    fi
+    sudo apt-get update || FATAL "Configured apt proxy, but couldn't run 'apt-get update'. Check ${OSM_APT_PROXY_FILE}"
+    track prereq apt_proxy_configured_ok
+    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
+}
+
+function ask_user(){
+    # ask to the user and parse a response among 'y', 'yes', 'n' or 'no'. Case insensitive
+    # Params: $1 text to ask;   $2 Action by default, can be 'y' for yes, 'n' for no, other or empty for not allowed
+    # Return: true(0) if user type 'yes'; false (1) if user type 'no'
+    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
+    read -e -p "$1" USER_CONFIRMATION
+    while true ; do
+        [ -z "$USER_CONFIRMATION" ] && [ "$2" == 'y' ] && return 0
+        [ -z "$USER_CONFIRMATION" ] && [ "$2" == 'n' ] && return 1
+        [ "${USER_CONFIRMATION,,}" == "yes" ] || [ "${USER_CONFIRMATION,,}" == "y" ] && return 0
+        [ "${USER_CONFIRMATION,,}" == "no" ]  || [ "${USER_CONFIRMATION,,}" == "n" ] && return 1
+        read -e -p "Please type 'yes' or 'no': " USER_CONFIRMATION
+    done
+    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
+}
+
+function docker_login() {
+    echo "Docker login"
+    DEBUG "Docker registry user: ${DOCKER_REGISTRY_USER}"
+    sg docker -c "docker login -u ${DOCKER_REGISTRY_USER} -p ${DOCKER_REGISTRY_PASSWORD} --password-stdin"
+}
+
+function ask_proceed() {
+    [ -z "$ASSUME_YES" ] && ! ask_user "The installation will do the following
+    1. Install client tools (helm, kubectl, osmclient, wget, git, curl, tar, yq, flux, argo, kustomize)
+    2. Deploy auxiliary services (Git, S3)
+    3. Deploy mgmt cluster
+    4. Deploy OSM
+    5. Provision OSM
+    Do you want to proceed (Y/n)? " y && echo "Cancelled!" && exit 1
+}
+
+function check_osm_behind_proxy() {
+    export OSM_BEHIND_PROXY=""
+    export OSM_PROXY_ENV_VARIABLES=""
+    [ -n "${http_proxy}" ] && OSM_BEHIND_PROXY="y" && echo "http_proxy=${http_proxy}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} http_proxy"
+    [ -n "${https_proxy}" ] && OSM_BEHIND_PROXY="y" && echo "https_proxy=${https_proxy}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} https_proxy"
+    [ -n "${HTTP_PROXY}" ] && OSM_BEHIND_PROXY="y" && echo "HTTP_PROXY=${HTTP_PROXY}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} HTTP_PROXY"
+    [ -n "${HTTPS_PROXY}" ] && OSM_BEHIND_PROXY="y" && echo "HTTPS_PROXY=${HTTPS_PROXY}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} HTTPS_PROXY"
+    [ -n "${no_proxy}" ] && echo "no_proxy=${no_proxy}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} no_proxy"
+    [ -n "${NO_PROXY}" ] && echo "NO_PROXY=${NO_PROXY}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} NO_PROXY"
+
+    echo "OSM_BEHIND_PROXY=${OSM_BEHIND_PROXY}"
+    echo "OSM_PROXY_ENV_VARIABLES=${OSM_PROXY_ENV_VARIABLES}"
+
+    if [ -n "${OSM_BEHIND_PROXY}" ]; then
+        [ -z "$ASSUME_YES" ] && ! ask_user "
+The following env variables have been found for the current user:
+${OSM_PROXY_ENV_VARIABLES}.
+
+This suggests that this machine is behind a proxy and a special configuration is required.
+The installer will install Docker CE and a Kubernetes to work behind a proxy using those
+env variables.
+
+Take into account that the installer uses apt, curl, wget and docker.
+Depending on the program, the env variables to work behind a proxy might be different
+(e.g. http_proxy vs HTTP_PROXY).
+
+For that reason, it is strongly recommended that at least http_proxy, https_proxy, HTTP_PROXY
+and HTTPS_PROXY are defined.
+
+Finally, some of the programs (apt) are run as sudoer, requiring that those env variables
+are also set for root user. If you are not sure whether those variables are configured for
+the root user, you can stop the installation now.
+
+Do you want to proceed with the installation (Y/n)? " y && echo "Cancelled!" && exit 1
+    else
+        echo "This machine is not behind a proxy"
+    fi
+}
+