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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 $$ (bash PID) to read the correct
process IO counters.
This commit is contained in:
Viktor Barzin 2026-03-23 12:33:52 +02:00
parent 0a294a30a6
commit a95d434ff1
6 changed files with 28 additions and 28 deletions
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16
stacks/dbaas/modules/dbaas/main.tf
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@ -341,8 +341,8 @@ resource "kubernetes_cron_job_v1" "mysql-backup" {
command = ["/bin/bash", "-c", <<-EOT
set -euxo pipefail
_t0=$(date +%s)
_rb0=$(awk '/^read_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_wb0=$(awk '/^write_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_rb0=$(awk '/^read_bytes/{print $2}' /proc/$$/io 2>/dev/null || echo 0)
_wb0=$(awk '/^write_bytes/{print $2}' /proc/$$/io 2>/dev/null || echo 0)
export now=$(date +"%Y_%m_%d_%H_%M")
mysqldump --all-databases -u root --host mysql.dbaas.svc.cluster.local | gzip -9 > /backup/dump_$now.sql.gz
@ -353,8 +353,8 @@ resource "kubernetes_cron_job_v1" "mysql-backup" {
find . -name "dump_*.sql" -type f -mtime +14 -delete # clean up old uncompressed
_dur=$(($(date +%s) - _t0))
_rb1=$(awk '/^read_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_wb1=$(awk '/^write_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_rb1=$(awk '/^read_bytes/{print $2}' /proc/$$/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: $(( (_rb1 - _rb0) / 1048576 )) MiB"
@ -1097,8 +1097,8 @@ resource "kubernetes_cron_job_v1" "postgresql-backup" {
command = ["/bin/bash", "-c", <<-EOT
set -euxo pipefail
_t0=$(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)
export now=$(date +"%Y_%m_%d_%H_%M")
PGPASSWORD=$PGPASSWORD pg_dumpall -h postgresql.dbaas -U postgres | gzip -9 > /backup/dump_$now.sql.gz
@ -1109,8 +1109,8 @@ resource "kubernetes_cron_job_v1" "postgresql-backup" {
find . -name "dump_*.sql" -type f -mtime +14 -delete # clean up old uncompressed
_dur=$(($(date +%s) - _t0))
_rb1=$(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"