devops-school

Recording Rule Example 1
================================
# Aggregating up requests per second that has a path label:
- record: instance_path:requests:rate5m
  expr: rate(requests_total{job="myjob"}[5m])

- record: path:requests:rate5m
  expr: sum without (instance)(instance_path:requests:rate5m{job="myjob"})

Recording Rule Example 2

altmannmarcelo

# Many of these are obvious and stupidly simple, but for your reference and copy-pasting pleasure…


# Mextify all (with workaround for pesky samples that contain multi-line RSA key that breaks pt-mext)
for i in $(ls $1/*-mysqladmin); do { (cat $i | sed -e '/\-\-\-\-\-BEGIN\ PUBLIC\ KEY/,+9d' | pt-mext -r -- cat -) > $i.mext && echo $i.mext;} done;

# Inspect given variable through multiple mext samples (revealing ;-))
grep Table_locks_waited *.mext |less -S

#Find contentious tables

scottames

MaxScale & Pacemaker on CentOS 7

Install packages on both nodes

sudo yum install corosync pcs pacemaker maxscale

Set the password for the hacluster user [both nodes]

leifg

file_to_disk = './tmp/large_disk.vdi'

Vagrant::Config.run do |config|
  config.vm.box = 'base'

  config.vm.customize ['createhd', '--filename', file_to_disk, '--size', 500 * 1024]
  config.vm.customize ['storageattach', :id, '--storagectl', 'SATA Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', file_to_disk]
end