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Explicitly lowering TCP keepalives to 120s to deal with naughty load balancers #548

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Sep 8, 2023
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Explicitly lowering TCP keepalives to 120s to deal with naughty load balancers #548

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3 changes: 3 additions & 0 deletions CHANGES.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,9 @@ Unreleased
* Increased the timeout for querying ``sys.snapshots`` table when verifying backup
repository.

* Explicitly lowering TCP keepalives to 120s to deal with naughty load balancers.
Looking at you, AWS NLB.

2.30.3 (2023-08-29)
-------------------

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12 changes: 11 additions & 1 deletion crate/operator/create.py
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Expand Up @@ -587,7 +587,17 @@ def get_statefulset_init_containers(crate_image: str) -> List[V1Container]:
# We need to do this in an init container because of the required
# security context. We don't want to run CrateDB with that context,
# thus doing it before.
command=["sysctl", "-w", "vm.max_map_count=262144"],
command=[
"sysctl",
"-w",
# CrateDB requirement due to the number of open file descriptors
"vm.max_map_count=262144",
# Certain load balancers (i.e. AWS NLB) terminate idle connections.
# We set explicit TCP keepalives so that this does not happen.
"net.ipv4.tcp_keepalive_time=120",
"net.ipv4.tcp_keepalive_intvl=30",
"net.ipv4.tcp_keepalive_probes=6",
],
image="busybox:1.35.0",
image_pull_policy="IfNotPresent",
name="init-sysctl",
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