KOWAZA for Mackerelid:karupanerura Mackerel Meetup #7 LT

KOWAZA means small trick in Japanese

about me

• id:karupanerura (twitter/github)

• Perl/Go/Swift/Kotlin/Java/JS/etc..

• Senior Engineer at Mobile Factoy, Inc.

• Join to Infrastructure Team since 2016/02

• Director at Japan Perl Association (JPA)

mackerel with me

• Mackerel contributer

• mackerel-agent-plugins (gearman)

• mackerel-check—plugins (masterha, ssh)

• Mackerel UG Organizer ← NEW

monitor processes

check-procs -p mysqld

Wait…

(In my environment) MySQL is stopped

to backup at 5am-6am.

🤔

true && echo “true” || echo “false”

😙

[ 5 -le “$hour” -and “$hour” -le 6 ] && echo “OK check-procs: In shutdown” || check-procs -p mysqld

😎

monitor logs

grep foo /path/to/log | grep bar | grep -v baz | wc -l

check-log plugin

check-log -f /path/to/log -p foo -p bar -E baz -c 1

Wait…

check-log -f /path/to/log -p foo -p bar ←Cannot do it :( -E baz -c 1

🤔

check-log -f <(grep foo /path/to/log) -p bar -E baz -c 1

😙

grep foo /path/to/log | check-log -f /dev/stdin -p bar -E baz -c 1

😎

monitor mouts

Should mount a HDD as readable & writable

(If mount with errors=remout-ro) When the HDD is breaking, re-mount the HDD readonly

monitor with Mackerel

# XXX: exit code 2 is CRITICAL touch /tmp/write-test.watch || exit 2

But, hackish…

no kind message outputs…

🤔

check-log -f /proc/mounts -p ' ro(,|$)’ --no-state

😙

Let’s hack Mackerel !!

😎