Linux

How to use SSH FIDO2 on a remote machine

Configuring and using a local Yubikey for SSH with FIDO2 is very straight forward using the Yubico manual Securing SSH with FIDO2

But in some cases I would like to use my Yubikey based SSH key on my office's workstation when I am at home using my notebook.

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Old Let’s Encrypt Root Certificate Expiration workaround

The expiring Let’s Encrypt DST Root CA X3 can cause problems on old servers:

root@server:/etc# wget https://www.example.com/monitoring
--2021-09-30 21:34:39--  https://www.example.com/monitoring
Resolving www.example.com (www.example.com)... 93.184.216.34
Connecting to www.example.com (www.example.com)|93.184.216.34|:443... connected.
ERROR: The certificate of `www.example.com' is not trusted.

Fortunately there is an easy workaround to ensure the expired chain is not checked.

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Shrinking LVM physical volume running on software RAID

Due to a misconfiguration I had to shrink a LVM 2 volume group and its physical volume running on a software RAID.

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Samsung SSD as Linux Software RAID

Initially I thought adding a pair of Samsung 860 EVO as software RAID to my small home server cannot be too hard...

... but they seem to require special kernel settings to work.

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