8521ddca28
This patch is adding configuration option to
manipulate with kernel option sysctl_net_ipv4_tcp_retries2.
More informations about kernel option in [1][2]
and RedHat suggestion [3] to set for DBs and HA.
[1]: https://pracucci.com/linux-tcp-rto-min-max-and-tcp-retries2.html
[2]: https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die/
[3]: https://access.redhat.com/solutions/726753
Closes-Bug: #1917068
Change-Id: Ia0decbbfa4e33b1889b635f8bb1c9094567a2ce6
(cherry picked from commit 09d0409ed4)
14 lines
631 B
YAML
14 lines
631 B
YAML
---
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features:
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- |
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Added a new haproxy configuration variable,
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``haproxy_host_ipv4_tcp_retries2``,
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which allows users to modify this kernel option.
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This option sets maximum number of times a TCP packet is retransmitted
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in established state before giving up. The default kernel value is 15,
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which corresponds to a duration of approximately between 13 to 30
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minutes, depending on the retransmission timeout. This variable can be used
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to mitigate an issue with stuck connections in case of VIP failover,
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see `bug 1917068 <https://bugs.launchpad.net/kolla-ansible/+bug/1917068>`__
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for details.
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