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fix backup IO stats: use /proc/$$/io instead of /proc/self/io

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/proc/self/io inside $(awk ...) resolves to the awk subprocess PID,
not the parent bash shell. Use $$ (bash PID) to read the correct
process IO counters.
This commit is contained in:
Viktor Barzin 2026-03-23 12:33:52 +02:00
parent 0a294a30a6
commit a95d434ff1
6 changed files with 28 additions and 28 deletions
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8
stacks/redis/modules/redis/main.tf
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@ -284,8 +284,8 @@ resource "kubernetes_cron_job_v1" "redis-backup" {
command = ["/bin/sh", "-c", <<-EOT
set -eux
_t0=$(date +%s)
_rb0=$(awk '/^read_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_wb0=$(awk '/^write_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_rb0=$(awk '/^read_bytes/{print $2}' /proc/$$/io 2>/dev/null || echo 0)
_wb0=$(awk '/^write_bytes/{print $2}' /proc/$$/io 2>/dev/null || echo 0)
TIMESTAMP=$(date +%Y%m%d-%H%M)
# Trigger a fresh RDB save on the master
@ -297,8 +297,8 @@ resource "kubernetes_cron_job_v1" "redis-backup" {
find /backup -name 'redis-*.rdb' -type f -mtime +28 -delete
_dur=$(($(date +%s) - _t0))
_rb1=$(awk '/^read_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_wb1=$(awk '/^write_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_rb1=$(awk '/^read_bytes/{print $2}' /proc/$$/io 2>/dev/null || echo 0)
_wb1=$(awk '/^write_bytes/{print $2}' /proc/$$/io 2>/dev/null || echo 0)
echo "=== Backup IO Stats ==="
echo "duration: $${_dur}s"
echo "read: $(( (_rb1 - _rb0) / 1048576 )) MiB"