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annotate mod_graceful_shutdown/README.markdown @ 2551:9392f45b0364

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mod_firewall: Fix FORWARD to send from current module's host
author Matthew Wild <mwild1@gmail.com>
date Thu, 23 Feb 2017 14:01:12 +0000
parents 4652a112a4ba
children 88474dd1af48
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4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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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>
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2
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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3 Why
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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4 ===
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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5
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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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>
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7 are teared down. Due to all these things happening very quickly,
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
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8 sometimes eg client unavailable notifications don't make it to all
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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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>
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10 just after.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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11
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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12 How
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
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13 ===
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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14
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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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>
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16 with a brief pause between them.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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17
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
parents:
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18 It goes something like this
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4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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20 1. Stop accepting new client connections.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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21 2. Close all client connections.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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22 3. Fire event for everything else.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
Kim Alvefur <zash@zash.se>
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23 4. Tell `net.server` to quit the main loop.
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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24 5. ???
4652a112a4ba mod_graceful_shutdown: Experiment in improving the shutdown experience
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25 6. Still here? Kill itself.
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26