Programmer DD

Dec 3, 2019 · Operations

Why SSH Login Stalls on New UCloud Hosts: Entropy Delays and Kernel Bugs

A user reported extremely slow first SSH login on a UCloud “High‑Kernel Ubuntu 18.04” instance, which was traced to slow entropy‑pool initialization in the Linux kernel, a libssl 1.1.1 bug, and a kernel configuration issue, leading to a fix involving disabling MOTD or enabling CONFIG_RANDOM_TRUST_CPU.