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====== Ubuntu Server 18.04 LTS ======

<WRAP center round important 60%>
Alles wird als root ausgeführt.
</WRAP>

===== IP einstellen =====
<file yaml /etc/netplan/01-netcfg.yaml>
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    ens160:
      addresses: [192.168.XXX.XXX/24]
      gateway4: 192.168.XXX.XXX
      nameservers:
         addresses: [XXX.XXX.XXX.XXX,XXX.XXX.XXX.XXX]
</file>

Und mit dem folgenden Befehl die Änderung übernehmen:
<file bash>
netplan apply
</file>

===== Server Mail Versand ermöglichen =====

==== Installieren ====
<file bash>
apt install postfix mailutils
</file>
  * Internet Site

==== Konfigurieren (am Beispiel von domainfactory) ====
<file ini /etc/postfix/main.cf>
# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
# fresh installs.
compatibility_level = 2

# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = XX-hostname-XX
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = $myhostname, XX-hostname-XX.XX-domain-XX.de, localhost.localdomain, localhost
relayhost = sslout.df.eu:465
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all

smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_use_tls = yes
smtp_tls_wrappermode = yes
smtp_tls_security_level = encrypt
</file>

<file ini /etc/postfix/sasl_passwd>
sslout.df.eu:465 XX-email-XX:XX-passwort-XX
</file>

<file bash>
postmap /etc/postfix/sasl_passwd
chmod 0600 /etc/postfix/sasl_passwd /etc/postfix/sasl_passwd.db
service postfix restart
</file>

==== Einstellung testen ====
<file bash>
echo "Test - Body" | mail -s "Test - Subject" XXX@XXX.XXX
</file>

==== Log checken ====
<file bash>
cat /var/log/mail.log
</file>

===== root Mails empfangen =====
<file ini /etc/aliases>
# See man 5 aliases for format
postmaster:    root
root: XXX@XXX.XXX
</file>

**Einstellungen übernehmen:**
<file bash>
newaliases
</file>

==== Einstellung testen ====
<file bash>
echo "Test - Body" | mail -s "Test - Subject" root
</file>

==== Log checken ====
<file bash>
cat /var/log/mail.log
</file>

===== DynDNS =====
[[https://www.duckdns.org/|Duck DNS]]

**Anleitung:** [[https://www.duckdns.org/install.jsp|Duck DNS - install - linux cron]]

===== unattended-upgrades =====

==== Installieren ====
<file bash>
apt-get install unattended-upgrades
</file>

==== Einstellugen ====
<file ini /etc/apt/apt.conf.d/50unattended-upgrades>
// Automatically upgrade packages from these (origin:archive) pairs
//
// Note that in Ubuntu security updates may pull in new dependencies
// from non-security sources (e.g. chromium). By allowing the release
// pocket these get automatically pulled in.
Unattended-Upgrade::Allowed-Origins {
        "${distro_id}:${distro_codename}";
	"${distro_id}:${distro_codename}-security";
	// Extended Security Maintenance; doesn't necessarily exist for
	// every release and this system may not have it installed, but if
	// available, the policy for updates is such that unattended-upgrades
	// should also install from here by default.
	"${distro_id}ESM:${distro_codename}";
	"${distro_id}:${distro_codename}-updates";
//	"${distro_id}:${distro_codename}-proposed";
//	"${distro_id}:${distro_codename}-backports";
};

// List of packages to not update (regexp are supported)
Unattended-Upgrade::Package-Blacklist {
//	"vim";
//	"libc6";
//	"libc6-dev";
//	"libc6-i686";
};

// This option will controls whether the development release of Ubuntu will be
// upgraded automatically.
Unattended-Upgrade::DevRelease "false";

// This option allows you to control if on a unclean dpkg exit
// unattended-upgrades will automatically run 
//   dpkg --force-confold --configure -a
// The default is true, to ensure updates keep getting installed
//Unattended-Upgrade::AutoFixInterruptedDpkg "false";

// Split the upgrade into the smallest possible chunks so that
// they can be interrupted with SIGTERM. This makes the upgrade
// a bit slower but it has the benefit that shutdown while a upgrade
// is running is possible (with a small delay)
//Unattended-Upgrade::MinimalSteps "false";

// Install all unattended-upgrades when the machine is shutting down
// instead of doing it in the background while the machine is running
// This will (obviously) make shutdown slower
//Unattended-Upgrade::InstallOnShutdown "true";

// Send email to this address for problems or packages upgrades
// If empty or unset then no email is sent, make sure that you
// have a working mail setup on your system. A package that provides
// 'mailx' must be installed. E.g. "user@example.com"
Unattended-Upgrade::Mail "root";

// Set this value to "true" to get emails only on errors. Default
// is to always send a mail if Unattended-Upgrade::Mail is set
Unattended-Upgrade::MailOnlyOnError "true";

// Remove unused automatically installed kernel-related packages
// (kernel images, kernel headers and kernel version locked tools).
//Unattended-Upgrade::Remove-Unused-Kernel-Packages "false";

// Do automatic removal of new unused dependencies after the upgrade
// (equivalent to apt-get autoremove)
//Unattended-Upgrade::Remove-Unused-Dependencies "false";

// Automatically reboot *WITHOUT CONFIRMATION*
//  if the file /var/run/reboot-required is found after the upgrade 
Unattended-Upgrade::Automatic-Reboot "true";
 
// If automatic reboot is enabled and needed, reboot at the specific
// time instead of immediately
//  Default: "now"
Unattended-Upgrade::Automatic-Reboot-Time "02:00";

// Use apt bandwidth limit feature, this example limits the download
// speed to 70kb/sec
//Acquire::http::Dl-Limit "70";

// Enable logging to syslog. Default is False
// Unattended-Upgrade::SyslogEnable "false";

// Specify syslog facility. Default is daemon
// Unattended-Upgrade::SyslogFacility "daemon";

// Download and install upgrades only on AC power
// (i.e. skip or gracefully stop updates on battery)
// Unattended-Upgrade::OnlyOnACPower "true";

// Download and install upgrades only on non-metered connection
// (i.e. skip or gracefully stop updates on a metered connection)
// Unattended-Upgrade::Skip-Updates-On-Metered-Connections "true";
</file>

==== PPA hinzufügen (am Beispiel Syncthing) ====
<file ini /etc/apt/apt.conf.d/50unattended-upgrades>
...

Unattended-Upgrade::Allowed-Origins {
	....
	"Syncthing:syncthing";
};

...
</file>

Quelle: https://askubuntu.com/a/87854/687750