diff --git a/content/posts/sentinel.md b/content/posts/sentinel.md
index d2d309a..307695c 100644
--- a/content/posts/sentinel.md
+++ b/content/posts/sentinel.md
@@ -1,9 +1,243 @@
 ---
 
-title: "Setup sentinel"
+title: "Setup sentinel (Ubuntu Server arm64)"
 date: 2022-07-23T08:00:20+05:30
 draft: false
 toc: true
 
 ---
 
+## Stage 0000: Flash SD Card
+
+Verify the checksum first
+
+```bash
+echo "<CHECKSUM> *ubuntu-VERSION-preinstalled-desktop-arm64+raspi.img.xz" | shasum --check
+```
+
+Flash the SD Card
+
+```bash
+xzcat ubuntu-VERSION-preinstalled-desktop-arm64+raspi.img.xz | sudo dd status=progress bs=4M of=/dev/XXX
+
+sync && sync && sync
+
+sudo eject /dev/XXX
+```
+
+
+## Stage 0001: Immediate initial setup
+
+### Set hostname
+
+```bash
+sudo hostnamectl set-hostname sentinel
+```
+
+### Set timezone
+
+```bash
+sudo timedatectl set-timezone Asia/Kolkata
+```
+
+### Set DNS Servers
+
+```bash
+nmcli connection modify "$(nmcli -g name,device connection show | grep "eth0" | cut -f1 -d":")" ipv4.dns "1.1.1.2,1.0.0.2"
+nmcli connection modify "$(nmcli -g name,device connection show | grep "eth0" | cut -f1 -d":")" ipv4.ignore-auto-dns yes
+```
+
+### REBOOT! (hostname needs to come in effect)
+
+```bash
+sudo reboot +0
+```
+
+### Stop, mask and disable services
+
+```bash
+sudo systemctl stop sleep.target suspend.target hibernate.target hybrid-sleep.target
+sudo systemctl disable sleep.target suspend.target hibernate.target hybrid-sleep.target
+sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target
+```
+
+### Change "boot args"
+
+```bash
+sudoedit /boot/firmware/usercfg.txt
+```
+
+Add the following lines to it:
+
+```
+hdmi_force_hotplug=1
+disable_overscan=1
+
+arm_freq=2000
+```
+
+
+### Generate SSH Keys
+
+```bash
+cd $HOME/.ssh
+ssh-keygen -t ed25519 -f bluefeds
+ssh-keygen -t ed25519 -f gitea
+ssh-keygen -t ed25519 -f github
+ssh-keygen -t ed25519 -f gitlab
+ssh-keygen -t ed25519 -f sentinel
+```
+
+### Reboot
+
+```bash
+sudo reboot +0
+```
+
+
+## Stage 0010
+
+
+### Upgrade packages
+
+```bash
+sudo apt-get update
+sudo apt-get upgrade
+```
+
+### Reboot
+
+```bash
+sudo reboot +0
+```
+
+## Stage 0011
+
+### Install packages
+
+```bash
+sudo apt-get install apache2 aria2 bat bc cifs-utils cmatrix curl exfat-fuse exfat-utils fd-find ffmpeg findutils git glances hdparm htop iotop iperf3 jq libpam-google-authenticator locate mediainfo mpv neofetch neovim nload openssh-server python3 python3-pip rename rsync samba samba-common-bin smartmontools speedtest-cli tldr tmux transmission-cli transmission-common transmission-daemon tree unrar unzip valgrind vim webp wget wireguard xz-utils yt-dlp zfs-dkms zip zsh zsh-autosuggestions zsh-syntax-highlighting
+
+chsh -s $(which zsh) $(whoami)
+```
+
+
+### vim-plug (Neovim)
+
+```bash
+sh -c 'curl -fLo "${XDG_DATA_HOME:-$HOME/.local/share}"/nvim/site/autoload/plug.vim --create-dirs https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'
+```
+
+**Open `nvim` and type `:PlugInstall`**
+
+
+## Stage 0100: ZFS
+
+### Install ZFS if not already installed
+
+Don't use `zfsutils-linux`, it depends on Ubuntu's kernel inclusions 
+```bash
+sudo apt-get install zfs-dkms
+```
+
+### Enable necessary services
+
+```bash
+sudo systemctl enable zfs-import-cache.service
+sudo systemctl enable zfs-import-scan.service
+sudo systemctl enable zfs-mount.service
+sudo systemctl enable zfs-share.service
+sudo systemctl enable zfs.target
+sudo systemctl enable zfs-zed.service
+```
+
+
+### Make sure an import cache file exists
+
+```bash
+sudo zpool set cachefile=/etc/zfs/zpool.cache vaikuntham
+```
+
+
+### Creating a new zpool?
+
+```bash
+sudo zpool create -o ashift=12 vaikuntham /dev/sda
+
+sudo zfs set atime=off vaikuntham
+sudo zfs set primarycache=all vaikuntham
+sudo zfs set recordsize=1M vaikuntham
+sudo zfs set xattr=sa vaikuntham
+
+sudo zfs create vaikuntham/torrents
+sudo zfs set recordsize=16K vaikuntham
+
+sudo chown ubuntu:ubuntu -vR /vaikuntham
+
+sudo zpool export vaikuntham
+
+sudo zpool import
+sudo zpool import -d /dev/disk/by-id <pool-id>
+
+sudo zpool set cachefile=/etc/zfs/zpool.cache vaikuntham
+
+zpool status -v
+zfs list
+
+sudo zpool scrub vaikuntham
+```
+
+### Reboot
+
+```bash
+sudo reboot +0
+```
+
+
+## Stage 0101: cron
+
+### user crontab
+
+```bash
+# pause torrents as a prep for zfs scrub
+*/10 18 * * 5 [ $(date +\%d) -le 07 ] && bash /home/ubuntu/.scripts/transmission/pause_all.sh
+
+#0 0 * * * bash /home/ubuntu/.scripts/transmission/change_bandwidth_priority.sh
+
+# remove after exam ends
+#*/2 6,7 * * * bash /home/ubuntu/.scripts/transmission/pause_downloading.sh
+#*/20 20 * * * bash /home/ubuntu/.scripts/transmission/resume_all.sh
+
+# maintenance script
+# [[ if zpool scrub is not running ]]
+#   -> [[ if containers are not running ]]
+#     -> start containers
+* * * * * bash /home/ubuntu/.scripts/cron/pratham/maintenance.sh
+```
+
+
+### root crontab
+
+```bash
+# ZFS snapshots
+#0 * * * * bash /home/ubuntu/.scripts/cronjobs/root/zfs-bak.sh
+
+# start scrub
+# on every first Friday of the month
+# at 1845 hours
+45 18 * * 5 [ $(date +\%d) -le 07 ] && /sbin/zpool scrub libertine
+
+# wireguard (ProtonVPN)
+#* * * * * bash /home/ubuntu/.scripts/cronjobs/root/proton-vpn.sh
+
+# backup .torrent files
+# chmod and chown
+# rm .macos files
+30 18 * * * bash /home/ubuntu/.scripts/cronjobs/root/midnight.sh
+
+# update fs database every 6 hours
+* */6 * * * updatedb
+
+# maintenance script
+#0 20 * * * bash /home/ubuntu/.scripts/cron/root/maintenance.sh
+```