I'm trying to model this reachability chain (fixed width font better to
view this):
, - my-fritz-box -- 8.8.8.8 -- internet -- gmail.com
| `- 8.8.4.4 -' `-
my-web-server-via-some-proxy
my-web-server -' |
`---------------------------------------------------'
Ideally I want to do this within WATO, not vi.
Looking first at the my-fritz-box-to-internet bit: the unreachability
rules should be:
R1) if *both* 8.8.8.8 and 8.8.4.4 are unreachable then everything to
the right is unreachable
R2) for other hosts, simply: if one of them is unreachable then
everything to the right is unreachable
I can see two solutions to do this:
S1) defining a cluster (cluster "internet" is unreachable
if *all* its member nodes (8.8.8.8 and 8.8.4.4) are unreachable).
S2) using host-parent-child relationships (internet is unreachable if
*all* its parents (8.8.8.8 and 8.8.4.4) are unreachable).
So my first questions:
Q1) is one of these solutions better, and if so, then why?
Looking next at the
my-web-server-to-internet-and-to-my-web-server-via-some-proxy
bit: I check access to my website via a public http proxy: the unreachability
logic rules should be:
R3) if *either* internet is unreachable *or* my-web-server is unreachable then
my-web-server-via-some-proxy is unreachable.
But I don't find any way in WATO to describe this
"if-either-parent-is-unreachable-
then-host-is-unreachable" logic.
So my next questions:
Q2) should my-web-server-via-some-proxy be a host or a service? Why?
Q3) is it possible to model these "unreachable if *either* A or B unreachable"
relationships?
I did plenty of googling and reading Check_MK docs, but didn't manage to
find anything. Any hints appreciated!
Alexis
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