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Monitoring MySQL with
Prometheus & Grafana
Julien Pivotto (@roidelapluie)
Open Source Monitoring Conference
November 22nd, 2017
SELECT USER();
Julien "roidelapluie" Pivotto
@roidelapluie
Sysadmin at inuits
Automation, monitoring, HA
MySQL/MariaDB user/admin/contributor
Grafana and Prometheus user/contributor
inuits
Monitoring /
Observability
Monitoring or Observability?
Collecting lots of data
Not only for alerting, also for understanding
You don't know what you will need
Who decides what to monitor?
Pre-Define checks
Check only what os needed
OR
Let the system you monitor decide what to
expose
Alert based on that data
Push or pull ?
Push: need to know and configure where your
server is
What if 2 3 10 servers?
What in dev?
Pull: Let any server take the metrics
Use service discovery to know what to
fetch
High availability
Monitoring is very important
Metamonitoring
What is the price to get a highly available
monitoring system?
Prometheus
https://prometheus.io/
Prometheus
Prometheus is a Cloud-Native Data-Centric Open-
Source Performant Simple metrics collection,
analysis and alerting tool.
Nothing more.
Cloud Native
Very easy to configure, deploy, maintain
Designed in multiple services
Container ready
Orchestration ready (dynamic config)
Open Source
Apache 2.0
CNCF
Go
Support for multiple OS
Many "exporters":
https://github.com/prometheus/prometheus/wiki/Defau
lt-port-allocations
Performance
Prometheus is designed to fetch data in an
interval measured in SECONDS
Designed to handle lots of metrics
New storage engine in 2.0 to scale even better
and support usecases like kubernetes
Data Centric
A Metric in Prometheus has metadata:
myql_global_status_handlers_total{handler="tmp_write"} 1122
And lots of function to filter, change, remove...
those metadata while fetching them.
Metrics type
Counters (always go up)
Gauge (go up and down)
Histograms (aggregate by buckets)
Summary (percentiles) (most of the time
useless)
A word about
Prometheus vs Graphite
Prometheus does not see a metric as an "event".
Metrics are current value until they are replaced.
You can not see when a metric has been included
in Prometheus.
For Events, Prometheus refers to Elasticsearch.
How?
Creative Commons Attribution 2.0 https://www.flickr.com/photos/75001512@N00/6824648824
Warning : this is complicated.
Prometheus uses HTTP and
PLAIN TEXT.
http(s) is supported
basic auth / token also
(exposing https is not Prometheus job)
$ curl http://127.0.0.1:9090/metrics
# HELP prometheus_notifications_queue_length
# The number of alert notifications in the queue.
# TYPE prometheus_notifications_queue_length gauge
prometheus_notifications_queue_length 0
# HELP prometheus_notifications_sent_total
# Total number of alerts successfully sent.
# TYPE prometheus_notifications_sent_total counter
prometheus_notifications_sent_total{alertmanager="127.0.0.1
:9093"} 4.796464e+06
$ curl http://127.0.0.1:9090/metrics
prometheus_notifications_queue_length 0
prometheus_notifications_sent_total{alertmanager="127.0.0.1
:9093"} 4.796464e+06
Anything that can embed a http
server can serve prometheus
metrics.
Native Prometheus integrations
Kubernetes
Ceph
etcd
telegraph
Grafana
mgmt
...
What when you can't?
Linux (not counting TUX web server)
MySQL
Third party software
Third party services
Exporters
Creative Commons Attribution 2.0 https://www.flickr.com/photos/fuzzy/563198182
Exporters
Exporters expose metrics with an HTTP API
They connect to the real target
Bindings available for many languages
Exporters do not save data ; they are not
"proxies" and don't "cache" anything
Official exporters
Consul, Memcached, MySQL, Node/System,
HAProxy, AWS Cloudwatch, Collectd, Graphite,
Statsd, JMX, influxdb, SNMP, Blackbox
Node exporter
Linux Metrics
Including: CPU, Memory, Disk space,
networking, load, time...
Textfile
As part of the node_exporter, you can write
metrics in file
Scripts output, etc ...
Blackbox exporter
HTTP, DNS, TCP sockets, ICMP...
http://127.0.0.1:9115/probe?
target=https://inuits.eu&module=http_2xx
probe_ssl_earliest_cert_expiry 1.52697083e+09
MySQL
Creative Commons Attribution 2.0 https://www.flickr.com/photos/lurkerm/262541595
Frequency
Some queries are expensive
You can decide to fetch some data every 1m,
others every 10s...
Wait .. Exporters don't cache??
How do I fetch some data every
10s and others every 1m?
scrape_configs:
­ job_name: 'mysql global status'
  scrape_interval: 10s
  static_configs:
  ­ targets:
    ­ '172.31.14.3:9104'
  params:
    collect[]:
    ­ global_status
­ job_name: 'mysql performance'
  scrape_interval: 1m
  static_configs:
  ­ targets:
    ­ '172.31.14.3:9104'
  params:
    collect[]:
    ­ perf_schema.tableiowaits
    ­ perf_schema.indexiowaits
    ­ perf_schema.tablelocks
MySQL Replication
MySQL Master <-> MySQL Master
MySQL Master -> MySQL Slave
MySQL Master -> MySQL Slave -> MySQL
Slave
MySQL Masters -> MySQL Slaves -> MySQL
Slaves -> MySQL Slaves
MySQL Master -> MySQL Slaves
pt-heartbeat
pt-heartbeart is a daemon that updates an entry
with current timestamp on a mysql server every
second.
On the replica, you can check the timestamp and
do  NOW ­ timestamp to get the real lag.
+­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­­+
| ts                         | server_id |
+­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­­+
| 2017­08­17T16:55:01.001030 |         1 |
+­­­­­­­­­­­­­­­­­­­­­­­­­­­­+­­­­­­­­­­­+
pt-heartbeat
GPL
Perl
Part of percona toolkit
wait, mysql has that natively
mysql> SHOW SLAVE STATUSG
...
Seconds_Behind_Master: 0
...
aka mysqld_exporter metric:
 mysql_slave_lag_seconds 
Bugs
Fixes for Seconds_Behind_Master in: 5.7.18,
5.6.36, 5.6.23, 5.6.16.
How it works
Checks the heartbeat table (SQL query). It's not
calling the  pt­heartbeat cli. So it is independant
from it.
CLI flags
collect.heartbeat
collect.heartbeat.database
collect.heartbeat.table
Metrics
mysql_heartbeat_stored_timestamp_seconds{server_id="1"}
mysql_heartbeat_now_timestamp_seconds{server_id="1"}
Back to Prometheus
Creative Commons Attribution 2.0 https://www.flickr.com/photos/andrepierre/14843110667
Exploring Metrics
Exploring Metrics
Exploring Metrics
Exploring Metrics
PromQL
mysql_global_status_commands_total
PromQL
mysql_global_status_commands_total{command="select"}
PromQL
mysql_global_status_commands_total
{command=~"select|set_options"}
PromQL
mysql_global_status_commands_total{command=~"select|set
_options"}
PromQL
deriv(mysql_global_status_connections[5m])
PromQL
mysql_up == 0
PromQL
sum( avg_over_time(
mysql_info_schema_threads[10m])) by
(instance) ­ sum(
avg_over_time(mysql_info_schema_thread
s[10m] offset 1d)) by (instance)
PromQL
{__name__=~".+innodb.+cache.*"}
predict_linear(mysql_heartbeat_lag_seconds[5m], 60*2)
sum(rate(mysql_global_status_commands_total{command=~"
(commit|rollback)"}[5m]))
Recording and alerting rules
Rules
Prometheus can record extra metrics
Make expensive calculations
Alert if value is present
groups:
­ name: mysql
  rules:
  ­ record: mysql_heartbeat_lag_second
    expr: |
      mysql_heartbeat_now_timestamp_seconds ­
      mysql_heartbeat_stored_timestamp_seconds
  ­ alert: MysqlReplicationNotRunning
    expr: |
      mysql_slave_status_slave_io_running == 0 OR
      mysql_slave_status_slave_sql_running == 0
    for: 2m
    annotations:    
      summary: "Slave replication is not running"
  ­ alert: MySQLReplicationLag
    expr: |
     (mysql_slave_lag_seconds > 30)
     AND on (instance)
     (predict_linear(
       mysql_slave_lag_seconds[5m], 60*2) > 0)
    for: 5m
    labels:
      priority: immediate
Alertmanager
When prometheus has an alert, it sends it.
Every minute by default, as long as the alert is
ongoing
Alertmanager, a separated daemon, do the
rest of the work
What is alertmanager doing?
Grouping
Inhibition
Silence
Notify
grouping alerts
5 nodes are down. Do you want 5 email?
group_by: ['alertname', 'cluster', 'service']
inhibition
Datacenter is on fire. Do you want to know that
switches, hosts, services are down?
­ source_match:
    severity: 'critical'
  target_match:
    severity: 'warning'
Silence
I upgrade kernel and reboot the service. Do I want
mails during that time?
Notifications
Alertmanager can notify you with:
Mails
Webhooks
3rd party services
SMS (sachet: 3rd party integration using
webhook)
Alerting routes
You can send alerts to defined people based
on routes
Everything to logs mailbox
Critical alerts
Network to net team SMS
Svc to app team SMS
Warning alerts
Network to net team mail
Svc to app team mail
High Availability: Prometheus
Have different prometheis servers with the
same config
They do not talk to each other
All of them fetch the same data
They monitor each other
High availability: Alertmanager
Have multiple alertmanagers with the same
config
Prometheis send alerts to all alertmanagers
Alert manager talk to each other not to send
the same notification
One tool does one job...
Prometheus will collect data
Alertmanager will send notifications
Exporters will expose data
Grafana will graph data
Grafana
Open Source (Apache 2.0)
Web app
Specialized in visualization
Pluggable
Multiple datasources: prometheus, graphite,
influxdb...
Has an API!
History of Grafana
Grafana is a fork of Kibana 3 ; used to be JS-
Driven.
Now fully featured, requires a database, multi-
projects/users support, etc...
Grafana and Prometheus
Prometheus shipped its own consoles
Now it recommends Grafana and deprecated
its own consoles
Grafana Dashboards
Grafana Dashboards
Time Picker
Configure Prometheus in
Grafana
Configure Prometheus in
Grafana
Prometheus Dashboard
Multiple Prometheus instances
You can add multiple prometheus instances
on grafana
You can add dropdown on the top to select
which one you want to use
Use case: prometheus HA, local prometheus
(with access mode=direct)
Creating Grafana Dashboards
Takes time
Requires deep knowledge of the tools
Improved over time
Easy to share (json + online library)
Percona Grafana Dashboard
Percona Open Sourced Grafana Dashboards
Covering MySQL, Mongo and Linux monitoring
Part of a bigger picture, PMM, but usable
standalone
Open Source (AGPL!)
https://github.com/percona/grafana-
dashboards
Installing Percona Graphes
Method 1
Enable File dashboards in Grafana
Clone grafana-dashboards to the configured
location (or make a package)
Method 2
Use the Grafana API to upload the JSON's.
MySQL Setup
You'll need mysqld_exporter, with a user
MySQL 5.1+
Performance Schema for full set of metrics
mysqld_exporter
-collect.binlog_size=true
-collect.info_schema.processlist=true`
node_exporter setup
node_exporter
-collectors.enabled=
"diskstats,filefd,filesystem,loadavg,meminfo,n
etdev,stat,time,uname,vmstat"
Prometheus (static file)
scrape_configs:
  ­ job_name: prometheus
    static_configs:
      ­ targets: ['localhost:9090']
        labels:
          instance: prometheus
  ­ job_name: linux
    static_configs:
      ­ targets: ['10.0.98.43:9100']
        labels:
          instance: db1
  ­ job_name: mysql
    static_configs:
      ­ targets: ['10.0.98.43:9104']
        labels:
          instance: db1
Dashboards
Dashboards
Dashboards
We don't need all of them?
Because Grafana is just viz, you can import
only the one you want (e.g. exclude Mongo)
You can import later any extra dashboard you
need
MySQL Overview
MySQL Overview
MySQL Overview
InnoDB
InnoDB
InnoDB
Replication
Other grafana features
Multi tenant
Deployments
Folders for dashboards (comming soon)
Jsonnet library to create dashboard
Brand new, still WIP
https://github.com/grafana/grafonnet-lib
Conclusions
Prometheus and Grafana are first-class
monitoring tools
Totally different approach than other tools
Embeddable into your apps
Percona Dashboards gets your graphes ready
in no-time with minimal efforts
Julien Pivotto
roidelapluie
roidelapluie@inuits.eu
Inuits
https://inuits.eu
info@inuits.eu
Contact

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