Mercurial > prosody-modules

annotate mod_graceful_shutdown/README.markdown @ 4877:adc6241e5d16

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
mod_measure_process: Report the enforced limit The soft limit is what the kernel actually enforces, while the hard limit is is how far you can change the soft limit without privileges. Unless the process dynamically adjusts the soft limit, knowing the hard limit is not as useful as knowing the soft limit. Reporting the soft limit and the number of in-use FDs allows placing alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jan 2022 18:55:20 +0100
parents 88474dd1af48
children 999e7cb7f6d9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2170
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 This module is an experiment about a more graceful shutdown process.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
2
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
3 Why
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
4 ===
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
5
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
6 When shutting down, a number of sessions, connections and other things
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
7 are teared down. Due to all these things happening very quickly,
2818
88474dd1af48 Various READMEs: s/eg/e.g.g/
Kim Alvefur <zash@zash.se>
parents: 2170
diff changeset
8 sometimes e.g. client unavailable notifications don't make it to all
2170
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
9 remote contacts because the server-to-server connections are teared down
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
10 just after.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
11
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
12 How
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
13 ===
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
14
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
15 This module works by breaking the shutdown process into separate steps
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
16 with a brief pause between them.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
17
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
18 It goes something like this
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
19
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
20 1. Stop accepting new client connections.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
21 2. Close all client connections.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
22 3. Fire event for everything else.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
23 4. Tell `net.server` to quit the main loop.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
24 5. ???
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
25 6. Still here? Kill itself.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
diff changeset
26