====== Global ======

Versionsinformation

<code>
root@devel:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:        18.04
Codename:       bionic

</code>

===== Packet Export Import =====

Export

<terminal>
''dpkg-query -f '${binary:Package}\n' -W> packages_list.txt''
</terminal>

Import

<terminal>
''xargs -a packages_list.txt apt install''
</terminal>


===== cloud-init =====

abschalten per dpkg-reconfigure cloud-init

===== netplan =====

==== Einfaches Beispiel ====


Beispiel yaml für proxmox VM:

<code>
network:
  version: 2
  renderer:  networkd
  ethernets:
    ens18:
      dhcp4:  no
      addresses:  [138.201.52.38/26]
      gateway4:  138.201.52.41
      nameservers:
        addresses:  [213.133.98.98,213.133.99.99,213.133.100.100]
      routes:
        - to:  0.0.0.0/0
          via:  138.201.52.41
          on-link:  true

</code>

==== Beispiel für zwei Schnittstellen mit Routing ====

<code>
network:
  version: 2
  renderer:  networkd
  ethernets:
    ens18:
      dhcp4:  no
      addresses:  [ 138.201.52.53/26 ]
      # gateway4:  138.201.52.1
      nameservers:
        addresses:  [ 213.133.98.98, 213.133.99.99, 213.133.100.100 ]
      routes:
        - to:  default
          via:  138.201.52.1
          table: 101
      routing-policy:
        - from: 0.0.0.0/0
          table: 101
    ens19:
      dhcp4:  no
      addresses:  [ 10.10.10.34/24 ]
      # gateway4:  10.10.10.1
      nameservers:
        addresses:  [ 213.133.98.98, 213.133.99.99, 213.133.100.100 ]
      routes:
        - to:  138.201.52.0/26
          via:  138.201.52.1
        - to:  10.10.10.0/24
          via:  10.10.10.1
          table: 102
      routing-policy:
        - from: 10.10.10.0/24
          table: 102


</code>

Achtung: gateway4 ist **deprecated**, siehe https://www.techrepublic.com/article/set-default-gateway-with-netplan-now-gateway4-been-deprecated/

===== dnsmasq startet nicht wegen Konflikt mit systemd-resolvd =====

[[https://unix.stackexchange.com/questions/304050/how-to-avoid-conflicts-between-dnsmasq-and-systemd-resolved|https://unix.stackexchange.com/questions/304050/how-to-avoid-conflicts-between-dnsmasq-and-systemd-resolved]]

Lösung: systemd-resolvd über /etc/systemd/resolved.conf abschalten:

''# disabled 15.10.18 thr DNSStubListener=no
==== OpenVPN Meldung "CRL has expired" ====

easyrsa: crl neu erzeugen, rüberkopieren. Siehe [[https://www.jobishmathew.me/openvpn-crl-has-expired/|https://www.jobishmathew.me/openvpn-crl-has-expired/]]

===== unattended upgrades =====


====== iptables ======

https://www.64-bit.de/dokumentationen/netzwerk/iptables/DE-IPTABLES-HOWTO-3.html

====== 20.04 LTS ipv6 abschalten ======

in /etc/sysctl.conf

<code>
net.ipv6.conf.all.disable_ipv6 = 1
</code>

Danach sysctl -p