Edge MQTT Node on a Norwegian VPS: K3s, WireGuard, Kernel Tuning
How to set up a single-node edge MQTT aggregator with K3s and WireGuard, and how to fix the faulty flags, units and sysctls that edge guides often repeat.
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How to set up a single-node edge MQTT aggregator with K3s and WireGuard, and how to fix the faulty flags, units and sysctls that edge guides often repeat.
How to run a three-node NATS JetStream cluster (server 2.6, nats.go 1.13) with replicated streams, authentication, correct acks and sane OS limits.
How to keep slow jobs out of the web request path with RabbitMQ, Celery 3.0 and Nginx 1.2 on Debian 7, with corrected configuration and the limits of the setup.
Build an OpenVPN 2.2 gateway on CentOS 6 with a private CA, and fix the usual failures: missing TUN device, no forwarding or NAT, and iptables rule order.
Cut disk waits on a MySQL 5.5 server on CentOS 6: convert tables to InnoDB, size the buffer pool and logs, set the flush policy, I/O scheduler and swappiness.
A 2009 reference for VPS users on container-based hosting: why "Cannot allocate memory" appears while free shows RAM, and how to read and fix it.
Why services in an OpenVZ container fail with allocation errors while free memory looks fine, and how to find and raise the exhausted User Beancounter limit.