mirror of https://github.com/zulip/zulip.git
42f84a8cc7
A number of autossh connections are already left open for port-forwarding Munin ports; autossh starts the connections and ensures that they are automatically restarted if they are severed. However, this represents a missed opportunity. Nagios's monitoring uses a large number of SSH connections to the remote hosts to run commands on them; each of these connections requires doing a complete SSH handshake and authentication, which can have non-trivial network latency, particularly for hosts which may be located far away, in a network topology sense (up to 1s for a no-op command!). Use OpenSSH's ability to multiplex multiple connections over a single socket, to reuse the already-established connection. We leave an explicit `ControlMaster no` in the general configuration, and not `auto`, as we do not wish any of the short-lived Nagios connections to get promoted to being a control socket if the autossh is not running for some reason. We enable protocol-level keepalives, to give a better chance of the socket being kept open. |
||
|---|---|---|
| .. | ||
| profile | ||
| prometheus | ||
| teleport | ||
| apache.pp | ||
| app_frontend.pp | ||
| app_frontend_monitoring.pp | ||
| camo.pp | ||
| firewall.pp | ||
| firewall_allow.pp | ||
| ksplice_uptrack.pp | ||
| munin_node.pp | ||
| munin_plugin.pp | ||
| prod_app_frontend_once.pp | ||