Added install of kubectl, rancher and new dedicated preseed for kubernetes

custom/disable_swap.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "This script should be run as root. Aborting..." > /dev/stderr
+    exit 1
+fi
+
+echo "Disabling swap..."
+swapoff -a
+
+echo "Disabling swap permanently ('/etc/fstab.bak' created)..."
+sed -i.bak '/ swap /d' /etc/fstab

custom/generate_ssh_cluster.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "This script should be run as root. Aborting..." > /dev/stderr
+    exit 1
+fi
+
+echo "Creating SSH key..."
+ssh-keygen -t rsa -b 4096 -q -N "" -f ~/.ssh/id_rsa
+
+echo "Adding SSH key to authorized..."
+cat ~/.ssh/rsa.pub >> ~/.ssh/authorized_keys

custom/install_base_packages.sh

@@ -1,11 +1,23 @@
 #!/bin/sh
 
-if [ $(id -u) -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
     echo "This script should be run as root. Aborting..." > /dev/stderr
     exit 1
 fi
 
-apt-get update
+echo "Updating apt package index..."
+apt-get update > /dev/null
 
-apt-get install software-properties-common python3-pip
+apt -q -y upgrade
 
+apt-get autoremove --purge
+
+echo "Installing base packages..."
+apt-get -q -y -o Dpkg::Use-Pty=0 install \
+    nano \
+    htop \
+    nload \
+    nethogs
+
+echo "Cleaning apt cache..."
+apt-get clean

custom/install_docker-compose.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-if [ $(id -u) -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
     echo "This script should be run as root. Aborting..." > /dev/stderr
     exit 1
 fi

custom/install_docker.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-if [ $(id -u) -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
     echo "This script should be run as root. Aborting..." > /dev/stderr
     exit 1
 fi
@@ -11,7 +11,7 @@ SUPPORTED_ARCH="amd64 armhf arm64"
 ARCH=$(dpkg --print-architecture)
 
 echo "Checking system architecture..."
-if echo $SUPPORTED_ARCH | grep -w $ARCH > /dev/null; then
+if echo "${SUPPORTED_ARCH}" | grep -w "${ARCH}" > /dev/null; then
     echo "Architecture ${ARCH} supported."
 else
     echo "Architecture ${ARCH} not supported! Aborting..."

custom/install_kubectl.sh

@@ -0,0 +1,59 @@
+#!/bin/sh
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "This script should be run as root. Aborting..." > /dev/stderr
+    exit 1
+fi
+
+#
+# Following this guide: https://kubernetes.io/docs/tasks/tools/install-kubectl/
+#
+
+echo "Updating apt package index..."
+apt-get update > /dev/null
+
+echo "Installing prerequisites..."
+apt-get -q -y -o Dpkg::Use-Pty=0 install apt-transport-https gnupg2 curl
+
+echo "Adding Kubernetes' repo key..."
+curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
+
+echo "Adding Kubernetes repo..."
+echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | tee -a /etc/apt/sources.list.d/kubernetes.list
+
+echo "Updating apt package index again..."
+apt-get update > /dev/null
+echo "Installing 'kubectl'..."
+apt-get -q -y -o Dpkg::Use-Pty=0 install kubectl
+
+# TODO: the command `kubectl cluster-info` gives an error and the script
+#       provided from the docs gives an error. In the docs they are make
+#       some sort of assumption that I cannot still figure out.
+#       Ffs this is an entry level doc and they already start to omit not
+#       obvious stuff... sorry for not owning a magic crystal ball. >:(
+
+# THIS, is a quality doc:
+# https://www.valent-blog.eu/2019/01/01/installare-kubernetes-in-debian-9/
+# The lines below comes from this doc.
+
+echo "Installing 'kubelet' and 'kubeadm'..."
+apt-get -q -y -o Dpkg::Use-Pty=0 install kubelet kubeadm
+
+echo "Marking in hold the packages 'kubectl', 'kubelet' and 'kubeadm' in order to prevent them to update in the future..."
+apt-mark hold kubelet kubeadm kubectl
+
+echo "Reloading systemd and restarting 'kubelet' service"
+systemctl daemon-reload
+systemctl restart kubelet
+
+# I guess these are the base images of kubernetes (?)
+echo "Pulling some base images.."
+kubeadm config images pull
+
+echo "Initializing kuvernetes.."
+kubeadm init
+
+echo "Adding kubernetes config to this user home folder (useful for non-root users)..."
+mkdir -p "$HOME/.kube"
+cp -i /etc/kubernetes/admin.conf "$HOME/.kube/config"
+chown "$(id -u)":"$(id -g)" "$HOME/.kube/config"

custom/install_rancher.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+# Sources:
+# https://www.rancher.cn/an-introduction-to-rke
+# https://devopsheaven.com/kubernetes/k8s/rke/devops/deploy/2019/10/21/install-kubernetes-locally-rke.html
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "This script should be run as root. Aborting..." > /dev/stderr
+    exit 1
+fi
+
+echo "Downloading and installing 'rke' executable..."
+wget -O rke https://github.com/rancher/rke/releases/download/v1.2.3/rke_linux-amd64 && \
+chmod +x rke && \
+mv rke /usr/local/bin && \
+rke --version
+
+echo "Giving access to the docker socket at the SSH user..."
+usermod -aG docker "$(id -un)"

custom/main.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-if [ $(id -u) -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
     echo "This script should be run as root. Aborting..." > /dev/stderr
     exit 1
 fi
@@ -10,5 +10,9 @@ SCRIPTPATH="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
 eval "${SCRIPTPATH}/install_packages.sh"
 eval "${SCRIPTPATH}/install_docker.sh"
 eval "${SCRIPTPATH}/install_docker-compose.sh"
+eval "${SCRIPTPATH}/disable_swap.sh"
+eval "${SCRIPTPATH}/install_kubectl.sh"
+eval "${SCRIPTPATH}/install_rancher.sh"
+eval "${SCRIPTPATH}/generate_ssh_cluster.sh"
 
 apt-get clean

preseed/kube.cfg

@@ -0,0 +1,100 @@
+#_preseed_V1
+#### Contents of the preconfiguration file (for buster)
+### Localization
+d-i debian-installer/language string it
+d-i debian-installer/country string IT
+d-i debian-installer/locale string it_IT.UTF-8
+
+# Keyboard selection.
+# Usare Ctrl+Alt+Backspace per terminare il server X?
+d-i	keyboard-configuration/ctrl_alt_bksp boolean true
+
+d-i	keyboard-configuration/modelcode string pc105
+d-i keyboard-configuration/toggle select No toggling
+d-i	keyboard-configuration/altgr select The default for the keyboard layout
+d-i	keyboard-configuration/layoutcode string it
+d-i	keyboard-configuration/variant select Italiana
+d-i	keyboard-configuration/compose select No compose key
+d-i	keyboard-configuration/switch select No temporary switch
+d-i console-setup/variantcode string qwerty
+d-i	keyboard-configuration/model select Generic 105-key PC (intl.)
+d-i keyboard-configuration/xkb-keymap select it
+
+d-i	keyboard-configuration/unsupported_config_options boolean true
+d-i	keyboard-configuration/unsupported_config_layout boolean true
+d-i	keyboard-configuration/unsupported_layout boolean true
+d-i	keyboard-configuration/unsupported_options boolean true
+
+### Network configuration
+d-i netcfg/choose_interface select auto
+d-i netcfg/get_hostname string debian-test
+d-i netcfg/get_domain string dominio-test
+d-i netcfg/wireless_wep string
+d-i hw-detect/load_firmware boolean true
+
+### Mirror settings
+d-i mirror/country string manual
+d-i mirror/http/hostname string debian.mirror.garr.it
+d-i mirror/http/directory string /debian
+d-i mirror/http/proxy string
+
+### Account setup
+# Skip creation of a root account (normal user account will be able to
+# use sudo).
+d-i passwd/root-login boolean false
+d-i passwd/user-fullname string Virtualuser
+d-i passwd/username string virtualuser
+d-i passwd/user-password-crypted password $6$SmihMODnNymjr40/$YAkRABY.qE8tOjXmg0Z6X5e.mdLOUsUseNaPwaLyCjK17LzV/NLE3IfcmkQgwGjBeeQ7peGEfurqe.SBY7JHU1
+
+### Clock and time zone setup
+d-i clock-setup/utc boolean true
+d-i time/zone string Europe/Rome
+d-i clock-setup/ntp boolean true
+
+### Partitioning
+d-i partman-auto/disk string /dev/sda
+d-i partman-auto/method string regular
+d-i partman-lvm/device_remove_lvm boolean true
+d-i partman-md/device_remove_md boolean true
+d-i partman-lvm/confirm boolean true
+d-i partman-lvm/confirm_nooverwrite boolean true
+d-i partman-auto/expert_recipe string                        \
+      root ::                                                \
+              4096 100 -1 ext4                               \
+                      $primary{ } $bootable{ }               \
+                      method{ format } format{ }             \
+                      use_filesystem{ } filesystem{ ext4 }   \
+                      mountpoint{ / }                        \
+              .
+d-i partman-partitioning/confirm_write_new_label boolean true
+d-i partman/choose_partition select finish
+d-i partman/confirm boolean true
+d-i partman/confirm_nooverwrite boolean true
+d-i partman/mount_style select uuid
+d-i partman-basicfilesystems/no_swap boolean false
+
+### Apt setup
+d-i apt-setup/non-free boolean true
+d-i apt-setup/contrib boolean true
+
+### Package selection
+tasksel tasksel/first multiselect none
+
+# Individual additional packages to install
+# Note: "console-setup" and "keyboard-configuration" are foundamental for
+#       keyboard configuration
+d-i pkgsel/include string nano wget openssh-server console-setup keyboard-configuration
+
+popularity-contest popularity-contest/participate boolean false
+
+### Boot loader installation
+d-i grub-installer/only_debian boolean true
+d-i grub-installer/with_other_os boolean true
+d-i grub-installer/bootdev  string /dev/sda
+
+### Finishing up the installation
+d-i finish-install/reboot_in_progress note
+d-i debian-installer/exit/poweroff boolean true
+
+#### Advanced options
+d-i preseed/late_command string modprobe usb-storage isofs; mkdir -p /cdrom; mount /dev/cdrom /cdrom; cp -r /cdrom/custom /target/srv/custom

preseed/preseed.cfg

@@ -146,8 +146,8 @@ d-i passwd/root-login boolean false
 #d-i passwd/root-password-crypted password [crypt(3) hash]
 
 # To create a normal user account.
-d-i passwd/user-fullname string Meli
+d-i passwd/user-fullname string Virtualuser
-d-i passwd/username string meli
+d-i passwd/username string virtualuser
 # Normal user's password, either in clear text
 #d-i passwd/user-password password insecure
 #d-i passwd/user-password-again password insecure