I'm running a virtualMachine on ESXi -- Ubuntu as a webserver -- (apache2 with nginx as his proxy, php, mysql) and services keeps hanging/freezing causing the whole server to be unresponsive. It's not possible to connect to it by ssh, basicly it requires a reboot from vSphere to come back online.
Description: Ubuntu 10.04.1 LTS Release: 10.04 Codename: lucid
at vSphere I see this message when my server is unreachable:: INFO: task: apache2 (or mysql or nginx) blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_sys_timeout_secs" disables this message
i think that likely it happens in high traffic on my sites what could i do?!