Moving to Wordpress

Blogger has the distinct 'abandonware' feel to it (and the editor is really frustrating for code snippets), so I'm migrating to Wordpress. You can find past and future posts at djanotes.wordpress.com. I hope you'll join me there.

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Connecting to a wifi network with netplan

How do you connect to a a wifi network with netplan? I hang out on the #netplan IRC channel on Freenode, and this comes up every so often. netplan - the default network configuration tool in Ubuntu 17.10 onwards - currently supports WPA2 Personal networks, and open (unencrypted) networks only. If you need something else, consider using NetworkManager directly, or falling back to ifupdown and wpa_supplicant for a little longer. Without further ado, here are tested, working YAML files for connection to my local WPA2 and unencrypted network. The only things that have been changed are the SSIDs and password. Both networks have a router providing dhcp4. In both cases I assume there's only one wifi device in the system - if this is not true, replace match: {} with something more specific. You can drop these in /etc/netplan and run netplan generate; netplan apply and things should work. The network will also be brought up on subsequent boots. Note that, as always in YAML, ind

Netplan by example

netplan is the default network configuration system for new installs of Ubuntu 18.04 (Bionic). It uses YAML to configure network interfaces, instead of /etc/network/interfaces . I've been testing netplan for a while, so in light of the release of Bionic, here's my set of examples, caveats, tips and tricks. Contents General tips and tricks Matching Basic IPv4 configuration MTUs Bridges, Bonds and VLANs Wifi IPv6 Supplementing or replacing netplan Going Further General tips and tricks Tabs are not allowed in YAML and currently you get a very useless error message if you use them: "Invalid YAML at //etc/netplan/10-bridge.yaml line 5 column 0: found character that cannot start any token". If you see this, check for tabs! Indentation matters in YAML. Make sure that things line up where they're supposed to. Rebooting is somewhat more reliable than netplan apply , but make sure there are no errors in your YAML before you reboot or no network

Anonymous bridges in netplan

netplan is the default network configuration system for new installs of Ubuntu 18.04 (Bionic). Introduced as the default in Artful, it replaces /etc/network/interfaces . One question that gets asked repeatedly is: "How do I set up an anonymous bridge in netplan?" (An anonymous bridge, I discovered, is one where the bridge doesn't have an IP address; it's more akin to a switch or hub.) It's been approached on Launchpad , and comes up on the IRC channel. If you're trying to create a bridge without an IP address, the obvious first thing to try is this: network: version: 2 ethernets: ens8: match: macaddress: 52:54:00:f9:e9:dd ens9: match: macaddress: 52:54:00:56:0d:ce bridges: br0: interfaces: [ens8, ens9] This is neat, plausible, and wrong - the bridge will be created but will stay 'down'. Per ip a : 5: br0: <BROADCAST,MULTICAST> mtu 15

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