Summary
When you have an outage caused by a performance issue, you don't want to lose precious time just to install the tools needed to diagnose it. Here is a list of "crisis tools" I recommend installing on your Linux servers by default (if they aren't already), along with the (Ubuntu) package names that they come from: PackageProvidesNotes procpsps(1), vmstat(8), uptime(1), top(1)basic stats util-linuxdmesg(1), lsblk(1), lscpu(1)system log, device info sysstatiostat(1), mpstat(1), pidstat(1), sar(1)d...