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This page is the list of "today I learned" things that I learned while setting up a desktop Ubuntu 18.04 server. | This page is the list of "today I learned" things that I learned while setting up a desktop Ubuntu 18.04 server. | ||
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* In 18.04, ubuntu changed the way network interfaces are named, so the mac address is hard-coded in the device name | * In 18.04, ubuntu changed the way network interfaces are named, so the mac address is hard-coded in the device name | ||
* There is all kinds of shit in <code>/etc/network/iface-up.d/</code> - it is a directory containing a bunch of scripts, each script is run once each time an interface is brought up. same thing with if-down and if-post-down and etc. | * There is all kinds of shit in <code>/etc/network/iface-up.d/</code> - it is a directory containing a bunch of scripts, each script is run once each time an interface is brought up. same thing with if-down and if-post-down and etc. | ||
* You can use any IP in the range 127.0.0.0/8 as a loopback IP address. | * You can use any IP in the range 127.0.0.0/8 as a loopback IP address. Add up and down commands to the loopback entry in <code>/etc/network/interfaces</code>. See [https://askubuntu.com/a/1158080] | ||
* The IP addresses in <code>/etc/resolv.conf</code> that contain upstream nameservers have port 53 hard-coded, so there's no way to run multiple DNS servers on different ports. Instead, you can run different DNS servers on unusual loopback IP addresses, and access them that way. | * The IP addresses in <code>/etc/resolv.conf</code> that contain upstream nameservers have port 53 hard-coded, so there's no way to run multiple DNS servers on different ports. Instead, you can run different DNS servers on unusual loopback IP addresses, and access them that way. | ||
Latest revision as of 23:52, 7 July 2020
Main article: Ubuntu/Bespin
This page is the list of "today I learned" things that I learned while setting up a desktop Ubuntu 18.04 server.
Gnome
- Gnome is highly configurable, but the GUI gives zero control over those settings.
- Gnome themes are just files living in
/usr/share/themes - More themes available online
Networking
- Debian (Raspberry Pi, Kali) comes with dhcpcd baked in
- Ubuntu comes with dhclient baked in
- Difference between dhcpcd and dhclient? dhclient is older, provided by ISC, serves as a reference; dhcpcd is newer and more lightweight
- Network manager is a surprisingly difficult service to stop
- Ubuntu 18.04 server runs a stub dns server - resolv.conf, and the systemd-ressolved service - and it is extremely confusing because turning it off can disable the internet. So don't just go around deleting stuff!
- In 18.04, ubuntu changed the way network interfaces are named, so the mac address is hard-coded in the device name
- There is all kinds of shit in
/etc/network/iface-up.d/- it is a directory containing a bunch of scripts, each script is run once each time an interface is brought up. same thing with if-down and if-post-down and etc. - You can use any IP in the range 127.0.0.0/8 as a loopback IP address. Add up and down commands to the loopback entry in
/etc/network/interfaces. See [1] - The IP addresses in
/etc/resolv.confthat contain upstream nameservers have port 53 hard-coded, so there's no way to run multiple DNS servers on different ports. Instead, you can run different DNS servers on unusual loopback IP addresses, and access them that way.