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Actually set MEMORY_LIMIT_IN_BYTES based on cgroups limits #427

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Actually set MEMORY_LIMIT_IN_BYTES based on cgroups limits #427

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15 changes: 13 additions & 2 deletions src/root/usr/share/container-scripts/postgresql/common.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,19 @@
export POSTGRESQL_MAX_CONNECTIONS=${POSTGRESQL_MAX_CONNECTIONS:-100}
export POSTGRESQL_MAX_PREPARED_TRANSACTIONS=${POSTGRESQL_MAX_PREPARED_TRANSACTIONS:-0}

# Perform auto-tuning based on the container cgroups limits (only when the
# limits are set).
# Set MEMORY_LIMIT_IN_BYTES based on the container cgroups memory limits
# (only when the limits are set).
if [[ -f /sys/fs/cgroup/memory/memory.limit_in_bytes ]]; then
MEMORY_LIMIT_IN_BYTES=$(cat /sys/fs/cgroup/memory/memory.limit_in_bytes)
elif [[ -f /sys/fs/cgroup/memory.max ]]; then
# CGroups v2
MEMORY_LIMIT_IN_BYTES=$(cat /sys/fs/cgroup/memory.max)
if [[ "${MEMORY_LIMIT_IN_BYTES}" == "max" ]]; then
unset MEMORY_LIMIT_IN_BYTES
fi
fi

# Perform auto-tuning based on MEMORY_LIMIT_IN_BYTES.
# Users can still override this by setting the POSTGRESQL_SHARED_BUFFERS
# and POSTGRESQL_EFFECTIVE_CACHE_SIZE variables.
if [[ "${NO_MEMORY_LIMIT:-}" == "true" || -z "${MEMORY_LIMIT_IN_BYTES:-}" ]]; then
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