NAME¶
fair.conf —
configuration file for the carrousel and transponder
daemons
DESCRIPTION¶
- Debug (bool,
false)
- Runs the program in debug mode: it will not detach, it will print status
updates very frequently, it will print extra diagnostic messages to
stderr.
- DropPrivs (bool,
true)
- The program will switch to a different uid/gid after obtaining root-only
resources. See also the UserID and GroupID variables.
- WorkerService
(string, smtp) *
- This is the service on which the worker nodes offer the service that is
being balanced. Typically this is the service of another daemon, e.g.
Postfix. The transponder daemon also uses this as the datagram source
service for its status updates.
- BalancerService
(string, smtp) *
- The stream service on which the carrousel daemon listens for incoming
connections. These connections will be put through to one of the worker
nodes.
- TransponderService
(string, rlp) *
- The carrousel daemon listens on this service for status update datagrams
from the transponders. See also the AllowUDP variable.
- PingInterval
(time, 0.1 seconds)
- How often the transponder sends an update to each carrousel. So, if two
carrousels are configured and the interval is 0.1 seconds, that
transponder sends 20 packets every second.
- PingTimeout (time,
0.5 seconds)
- After this period has elapsed without receiving any status update packets
from the transponder, this host is considered dead.
- IdleTimeout (time,
600.0 seconds)
- The connection is terminated if neither party has sent something for this
many seconds. For SMTP connections this would have to be at least 600.0
seconds, see RFC 2821 section 4.5.3.2.
- ConnectTimeout
(time, 1.0 seconds)
- When connecting to a worker node, abort after this many seconds have
elapsed and no connection is established.
- ConnectAttempts
(integer, 3)
- When putting through a connection fails, the carrousel will attempt to
contact other worker nodes. It will give up after this many tries.
- BenchPeriod (time,
5.0 seconds)
- If a connection to a worker node fails it is excluded from new connections
for this many seconds.
- TrailPeriod (time,
60.0 seconds)
- When a connection is finished, pretend it lasted this many seconds more
for load calculation purposes.
- Hysteresis
(integer, 0)
- Add an advantage to the last used worker node so that it gets selected in
preference of others.
- MaxCapacity
(integer, 100)
- When sending update packets, the capacity of the worker node measured in
terms of concurrent connections. This number is adjusted for the current
load average before sending it to the carrousel nodes.
- MaxBurst (integer,
65536)
- Ringbuffer size for load balancer nodes.
- MinBurst (integer,
1450)
- If fewer than this many bytes are available in the ring buffer, do not
read anything but try to free up space first.
- LocalTCP (bool,
yes)
- Only allow connections over the loopback interface. If this option is set
to "no", connections will be accepted on any interface and on
any address.
- AllowUDP (extended
regexp, ^)
- Only datagram status packets that match this extended regular expression
are accepted. All other datagram packets are logged and silently dropped.
Once UDP packets are accepted from a certain source, they are never
matched against this regexp again.
