diff --git a/ct/docker.sh b/ct/docker.sh
index 6e97d3dbc..a01805c18 100644
--- a/ct/docker.sh
+++ b/ct/docker.sh
@@ -27,6 +27,10 @@ else
   var_disk="${var_disk:-4}"
   var_version="${var_version:-13}"
 fi
+# Only exported variables reach the install through lxc-attach.
+export var_docker_socket="${var_docker_socket:-}"
+export var_docker_compose="${var_docker_compose:-}"
+export var_docker_lxcfs="${var_docker_lxcfs:-}"
 
 header_info "$APP"
 variables
diff --git a/install/docker-install.sh b/install/docker-install.sh
index d9196229f..9debc98ae 100644
--- a/install/docker-install.sh
+++ b/install/docker-install.sh
@@ -15,12 +15,16 @@ update_os
 
 setup_deb_based() {
   setup_docker
-  read -r -p "${TAB3}Expose Docker TCP socket (insecure) ? [n = No, l = Local only (127.0.0.1), a = All interfaces (0.0.0.0)] <n/l/a>: " socket_choice
+  if [[ -n "${var_docker_socket:-}" ]]; then
+    socket_choice="$var_docker_socket"
+  else
+    read -r -p "${TAB3}Expose Docker TCP socket (insecure) ? [n = No, l = Local only (127.0.0.1), a = All interfaces (0.0.0.0)] <n/l/a>: " socket_choice
+  fi
   case "${socket_choice,,}" in
-  l)
+  l | local)
     socket="tcp://127.0.0.1:2375"
     ;;
-  a)
+  a | all)
     socket="tcp://0.0.0.0:2375"
     ;;
   *)
@@ -66,8 +70,12 @@ setup_alpine() {
   msg_ok "Installed Docker"
 
   DOCKER_COMPOSE_LATEST_VERSION=$(get_latest_github_release "docker/compose" false)
-  read -r -p "${TAB3}Would you like to add Docker Compose? <y/N> " prompt
-  if [[ "${prompt,,}" =~ ^(y|yes)$ ]]; then
+  if [[ -n "${var_docker_compose:-}" ]]; then
+    prompt="$var_docker_compose"
+  else
+    read -r -p "${TAB3}Would you like to add Docker Compose? <y/N> " prompt
+  fi
+  if [[ "${prompt,,}" =~ ^(y|yes|true)$ ]]; then
     msg_info "Installing Docker Compose $DOCKER_COMPOSE_LATEST_VERSION"
     DOCKER_CONFIG=${DOCKER_CONFIG:-$HOME/.docker}
     mkdir -p "$DOCKER_CONFIG"/cli-plugins
@@ -75,13 +83,23 @@ setup_alpine() {
     chmod +x "$DOCKER_CONFIG"/cli-plugins/docker-compose
     msg_ok "Installed Docker Compose $DOCKER_COMPOSE_LATEST_VERSION"
   fi
-  read -r -p "${TAB3}Would you like to expose the Docker TCP socket? <y/N> " prompt
-  if [[ "${prompt,,}" =~ ^(y|yes)$ ]]; then
-    msg_info "Exposing Docker TCP socket"
-    $STD mkdir -p /etc/docker
-    $STD echo '{ "hosts": ["unix:///var/run/docker.sock", "tcp://0.0.0.0:2375"] }' >/etc/docker/daemon.json
+  if [[ -n "${var_docker_socket:-}" ]]; then
+    prompt="$var_docker_socket"
+  else
+    read -r -p "${TAB3}Would you like to expose the Docker TCP socket? <y/N> " prompt
+  fi
+  case "${prompt,,}" in
+  y | yes | a | all) socket="tcp://0.0.0.0:2375" ;;
+  l | local) socket="tcp://127.0.0.1:2375" ;;
+  *) socket="" ;;
+  esac
+  if [[ -n "$socket" ]]; then
+    msg_info "Exposing Docker TCP socket on $socket"
+    mkdir -p /etc/docker
+    # No $STD here: silent() captures stdout, which left daemon.json empty.
+    printf '{ "hosts": ["unix:///var/run/docker.sock", "%s"] }\n' "$socket" >/etc/docker/daemon.json
     $STD rc-service docker restart
-    msg_ok "Exposed Docker TCP socket at tcp://+:2375"
+    msg_ok "Exposed Docker TCP socket on $socket"
   fi
 }