Remember to set PTR record for IP4 and IP6

wget http://ftp.de.debian.org/debian/pool/main/c/check-mk/check-mk-agent_1.4.0p9-1_amd64.deb
dpkg -i check-mk-agent_1.4.0p9-1_amd64.deb

Install packages

apt-get install mosh fail2ban vim sudo git xinetd smartmontools mailutils bash-completion

https://pve.proxmox.com/wiki/User_Management

useradd jnoer
passwd jnoer
groupadd watchman
usermod -a -G watchman jnoer

Change /etc/pve/user.cfg

user:jnoer@pam:1:0:Jesper:Noer:jesper@noerit.gl:::
user:giver@pam:1:0:Anders:Giversen:giversen@giver.dk:::
user:root@pam:1:0:::jesper@noerit.gl

acl:1:/:jnoer@pam,giver@pam:Administrator:

SMART https://pve.proxmox.com/wiki/Disk_Health_Email_Alerts

Change /etc/default/smartmontools with this code

enable_smart="/dev/sda /dev/sdb"

start_smartd=yes

smartd_opts="--interval=10800"

Comment other lines and add this in /etc/smartd.conf

/dev/sda -d sat -s (S/../.././20|L/../../5/03) -m jesper@noerit.gl
/dev/sdb -d sat -s (S/../.././20|L/../../5/03) -m jesper@noerit.gl

# SEND TEST Mail
/dev/sda -m jesper@noerit.gl -M test

This is good for 5.2 https://pve.proxmox.com/wiki/Certificate_Management

acme account register default jesper@noerit.gl

pvenode config set --acme domains=example.invalid

pvenode acme cert order

This is the older version

git clone https://github.com/Neilpang/acme.sh.git acme.sh-master
mkdir /etc/pve/.le
cd /root/acme.sh-master

./acme.sh --install --accountconf /etc/pve/.le/account.conf --accountkey /etc/pve/.le/account.key --accountemail "jesper@noerit.gl"

acme.sh --issue --standalone --keypath /etc/pve/local/pveproxy-ssl.key --fullchainpath /etc/pve/local/pveproxy-ssl.pem --reloadcmd "systemctl restart pveproxy" -d pve2.hosting.gl

https://pve.proxmox.com/wiki/ZFS:_Tips_and_Tricks

Remember to change xattr on ZFS

zfs set xattr=sa (pool)

Limit the amount of memory that ZFS can use as cache.

Create file /etc/modprobe.d/zfs.conf if it doesn't exists

# ZFS tuning for a proxmox machine that reserves 8GB for ZFS

# Don't let ZFS use less than 4GB and more than 8GB
options zfs zfs_arc_min=4294967296
options zfs zfs_arc_max=8589934592

# disabling prefetch is no longer required
options zfs l2arc_noprefetch=0