Technical notes from Linux and FreeBSD infrastructure work

SSH Pipe Speed 48 KB/sec FreeBSD 12 PF

We recently ran into an issue after upgrading a server from FreeBSD 11.2 to 12.1 where throughput via SSH pipes would crash to 48 KB/sec almost instantly...

• FreeBSD
• networking
• Performance
• PF
• SSH

FreeBSD Jenkins ERROR: Failed to parse POMs

We recently ran into an issue where the version of Maven under FreeBSD wasn’t updated enough (ports/pkg was behind) for the version of Jenkins in...

• FreeBSD
• Java
• Jenkins
• Maven

PHP-FPM Chroot “security library: invalid algorithm”

After an OS update on one of our client servers we witnessed a perplexing error in their chrooted PHP-FPM environment: security library: invalid algorithm...

• chroot
• Linux
• PHP
• PHP-FPM

Expand ZFS To Use Larger Disks / Free Space

One of the great features of ZFS is to be able to expand it using new, larger disks — even while it is online. To do this you’ll replace each disk...

• FreeBSD
• ZFS

Debian 8 Under Bhyve Networking Problem: Packets Over 230 Bytes Truncated

We’re a big fan of FreeBSD’s Bhyve hypervisor, including writing an open source lightweight management interface for it called BMT. While setting up a...

• Bhyve
• Debian
• Debian 8
• FreeBSD
• networking
• VirtIO

SOLVED: Can’t Connect to Linux Server Behind NAT From Linux/FreeBSD But Can From Windows

Strange networking behavior while trying to access a Linux server via NAT? Does it work from one computer but not another? We may have the solution! We...

• Linux
• NAT
• networking
• sysctl
• TCP
• Windows

SOLVED: NextCloud Admin “invalid email address” / User List Not Updating After Add Under PHP-FPM Chroot

We do a lot of NextCloud installs, and use PHP-FPM + chroot for maximum security. This gets tricky though, and one of the more obscure gotchyas we’ve...

• chroot
• ICU
• NextCloud
• PHP
• PHP-FPM

Test memcached Using UNIX File Sockets

We love monitoring things, and we also love memcached! Monitoring or testing a memcached instance that is using TCP is fairly straight forward, but we...

• memcached
• socat
• sockets

MySQL Ignoring my.cnf Values / Settings

This is a short one but hopefully it helps avoid some head-into-wall action: You’re setting values in your my.cnf file, wherever that may be, but MySQL...

SOLVED: Virtualenv RuntimeError: Package ‘sqlite’ must not be downloaded from pypi

While working with Python Virtualenvs / Virtual Environments we ran into a package that simply refused to install into it: sqlite: (venv)...

• Python
• UNIX

HOW TO: Windows 10 Under Bhyve /w FreeBSD 11

Windows 10 installing on a FreeBSD 11.0 Bhyve VM With FreeBSD 11 comes a new version of Bhyve with a feature that makes installing Windows 10 a snap: a...

• Bhyve
• FreeBSD
• Windows
• ZFS

SOLVED: FreeBSD + pip + virtualenv = file not found

We love python virtual environments, but under FreeBSD we occasionally see issues where pip is not correctly using the /usr/local/include and...

• FreeBSD
• Python
• systems administration