MySQL Bugs: #40744: Insufficient feedback by MEM agent in case of startup problems

Bug #40744	Insufficient feedback by MEM agent in case of startup problems
Submitted:	14 Nov 2008 13:48
Reporter:	Kristian Köhntopp	Email Updates:
Status:	Open	Impact on me:	None
Category:	MySQL Enterprise Monitor: Agent	Severity:	S4 (Feature request)
Version:	2.0.0.7088	OS:	Linux
Assigned to:		CPU Architecture:	Any

Description:
Setting up the agent for multiple instances by creating additional instance directories and requisite agent configurations.

[root@dc01mdb-01 instances]# ls -l
total 56
drwxr-xr-x  2 root root 4096 Nov 14 14:37 dev-adminlog
drwxr-xr-x  2 root root 4096 Nov 14 14:37 dev-avmdb-vip
drwxr-xr-x  2 root root 4096 Nov 14 14:33 dev-avmdb-vip2
drwxr-xr-x  2 root root 4096 Nov 14 14:36 dev-bfdmdb-vip
drwxr-xr-x  2 root root 4096 Nov 14 14:04 dev-bpmdb-vip
drwxr-xr-x  2 root root 4096 Nov 14 14:04 dev-bpmdb-vip2
drwxr-xr-x  2 root root 4096 Nov 14 14:05 dev-bpmdb-vip3
drwxr-xr-x  2 root root 4096 Nov 14 14:36 dev-dwmdb-vip
drwxr-xr-x  2 root root 4096 Nov 14 14:36 dev-dwmdb-vip2
drwxr-xr-x  2 root root 4096 Nov 14 14:35 dev-finmdb-vip
drwxr-xr-x  2 root root 4096 Nov 14 14:35 dev-qamdb-vip
drwxr-xr-x  2 root root 4096 Nov 14 14:35 dev-sessdb-vip
drwxr-xr-x  2 root root 4096 Nov 14 14:34 dev-testmdb-vip

Starting the agents yields nothing. Turns out permissions in the database were missing. No proper logging from the agent was observed.

How to repeat:
Create an agent installation with one or multiple instances, create agent setup problems such as missing permissions or other problems. Try to derive the cause for the problem not using strace. Try finding out the name of the instance causing the problem.

Suggested fix:
At agent startup, report problems (or success in a single message per instance monitored with instance name and port) in a way that allows proper debugging.