# you have to group servers into groups, 
# in practive this might be "loadbalancers", "webservers", "storageservers", ... 
# to make this example as simple as possible we've just one group named all
[[group]]
name = "all"

# you've define to define every server, when you've 100 servers you would end up 
# with 100 [[server]] blocks. Every server has a name, an ip and is part of N groups.
[[server]]
name = "local"
ip = "127.0.0.1"
datacenter = "fra.dc11" # optional, datacenter of the server. great to see if a whole datacenter has issues
groups = ["all"]
extra1 = "some extra value you could use in placeholders"
extra2 = "same like extra1"
extra3 = "same like extra1"

[[server]]
name = "fail"
ip = "127.0.222.1"
datacenter = "fra.dc12"
groups = ["all"]

# now comes the real check
# we're checking with the udp_ping from "local" to "all".
# in real applications you would create one check per usecase.
# For example, one check that checks the connection of load balancers to application servers 
# and another check that checks the connection from the application server to the database server.
# And maybe another check that checks the connection between 
# the database servers to detect replication problems before they occur.
[[check]]
from = "local" # could be a servername or a group
to = "all" # could be a servername or a group
check = "udp_ping"

[[analysis]]
from = "local" # server from
to = "all" # server to
name = "mtr" # just a name
min_loss = 20
# the command you want to run.
# variables:
# {{server.from.ip}}
# {{server.from.extra1}}
# {{server.from.extra2}}
# {{server.from.extra3}}
# {{server.to.ip}}
# {{server.to.extra1}}
# {{server.to.extra2}}
# {{server.to.extra3}}
command = "mtr -s 1000 -r -c 1000 {{server.to.ip}}"

[[group]]
name = "loadbalancers"

[[group]]
name = "applicationservers"

[[group]]
name = "databaseservers"

[[server]]
name = "loadbalancer1"
ip = "v4:127.0.2.2"
groups = ["loadbalancers"]

[[server]]
name = "loadbalancer2"
ip = "v4:127.0.2.3"
groups = ["loadbalancers"]

[[server]]
name = "applicationserver1"
ip = "v4:127.0.3.2"
groups = ["applicationservers"]

[[server]]
name = "applicationserver2"
ip = "v4:127.0.3.3"
groups = ["applicationservers"]

[[server]]
name = "databaseserver1"
ip = "v4:127.0.4.2"
groups = ["databaseservers"]

[[server]]
name = "databaseserver2"
ip = "v4:127.0.4.3"
groups = ["databaseservers"]

[[server]]
name = "databaseserver3"
ip = "v4:127.0.4.4"
groups = ["databaseservers"]

[[server]]
name = "database_backup"
ip = "v4:127.0.5.1"
groups = []

# load balancers needs to access applicationservers
[[check]]
from = "loadbalancers"
to = "applicationservers"
check = "udp_ping"

# applicationservers needs access to the database servers
[[check]]
from = "applicationservers"
to = "databaseservers"
check = "udp_ping"

# database servers must see each other
[[check]]
from = "databaseservers"
to = "databaseservers"
check = "udp_ping"

# backup server needs access to database servers
[[check]]
from = "database_backup"
to = "databaseservers"
check = "udp_ping"