Mounting /proc with hidepid under Ubuntu

On most Linux systems, anyone can see everyone else’s processes, running commands, and so on. This can be achieved by simply issuing a ps ax or similar. The same applies to the process monitor command “top”. In certain circumstances, you may want to avoid this. …

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Ubuntu and Zimbra upgrade night session

Music: Great White, Guns ‘n’ Roses, Pink Floyd, Five Finger Deathpunch, Mötley Crüe, AC/DC, Rammstein Drink coffee, 3L Open 4-6 SSH sessions Do Ubuntu from 16 > 18 > 20 Upgrade platform apps Check logs Stop timer at 7.5h Realize there’s no whiskey available to …

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Ubuntu 20.04, Nginx, Redmine, Ruby, and Passenger-Phusion confusion

Redmine, Ruby, Passenger-Phusion, and Nginx makes for an extremely confusing situation with dependencies, installation “instructions”, and “mismatching” package versions. Redmine wants Ruby x, your Linux distribution has Ruby y, Passenger-Phusion only works with Ruby z, and you quite often end up in a loop somewhere. …

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