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. |
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| .. | ||
| apache | ||
| apt/apt.conf.d | ||
| certs | ||
| cron.d | ||
| grafana | ||
| iptables | ||
| munin | ||
| munin-plugins | ||
| nagios4 | ||
| nagios_plugins/zulip_zephyr_mirror | ||
| needrestart | ||
| nginx/sites-available | ||
| postgresql | ||
| prometheus | ||
| supervisor/conf.d | ||
| chrony.conf | ||
| common-session | ||
| dot_emacs.el | ||
| krb5.conf | ||
| nagios_ssh_config | ||
| sshd_config | ||
| teleport_app.yaml | ||
| teleport_node.yaml | ||
| teleport_server.yaml | ||
| tornado_process_exporter.yaml | ||
| zephyr-clients | ||