Every module should be compatible with python2 and python3. All third party libraries should be installed system-wide or in python_modules directory. Module configurations are written in YAML and pyYAML is required.

Every configuration file must have one of two formats:

• Configuration for only one job:

update_every : 2 # update frequency
retries      : 1 # how many failures in update() is tolerated
priority     : 20000 # where it is shown on dashboard

other_var1   : bla  # variables passed to module
other_var2   : alb

• Configuration for many jobs (ex. mysql):

# module defaults:
update_every : 2
retries      : 1
priority     : 20000

local:  # job name
  update_every : 5 # job update frequency
  other_var1   : some_val # module specific variable

other_job: 
  priority     : 5 # job position on dashboard
  retries      : 20 # job retries
  other_var2   : val # module specific variable

update_every, retries, and priority are always optional.

The following python.d modules are supported:

This module will monitor one or more apache servers depending on configuration.

Requirements:

• apache with enabled mod_status

It produces following charts:

1. Requests in requests/s

• requests

2. Connections

• connections

3. Async Connections

• keepalive
• closing
• writing

4. Bandwidth in kilobytes/s

• sent

5. Workers

• idle
• busy

6. Lifetime Avg. Requests/s in requests/s

• requests_sec

7. Lifetime Avg. Bandwidth/s in kilobytes/s

• size_sec

8. Lifetime Avg. Response Size in bytes/request

• size_req

Needs only url to server's server-status?auto

Here is an example for 2 servers:

update_every : 10
priority     : 90100

local:
  url      : 'http://localhost/server-status?auto'
  retries  : 20

remote:
  url          : 'http://www.apache.org/server-status?auto'
  update_every : 5
  retries      : 4

Without configuration, module attempts to connect to http://localhost/server-status?auto

Module monitors apache mod_cache log and produces only one chart:

cached responses in percent cached

• hit
• miss
• other

Sample:

update_every : 10
priority     : 120000
retries      : 5
log_path     : '/var/log/apache2/cache.log'

If no configuration is given, module will attempt to read log file at /var/log/apache2/cache.log

Module shows current cpu frequency by looking at appropriate files in /sys/devices

Requirement: Processor which presents data scaling frequency data

It produces one chart with multiple lines (one line per core).

Sample:

sys_dir: "/sys/devices"

If no configuration is given, module will search for scaling_cur_freq files in /sys/devices directory. Directory is also prefixed with NETDATA_HOST_PREFIX if specified.

This module provides statistics information from dovecot server. Statistics are taken from dovecot socket by executing EXPORT global command. More information about dovecot stats can be found on project wiki page.

Requirement: Dovecot unix socket with R/W permissions for user netdata or dovecot with configured TCP/IP socket.

Module gives information with following charts:

1. logins and sessions

• logins
• active sessions

2. commands - number of IMAP commands

• commands

3. Faults

• minor
• major

4. Context Switches

• volountary
• involountary

5. disk in bytes/s

• read
• write

6. bytes in bytes/s

• read
• write

7. number of syscalls in syscalls/s

• read
• write

8. lookups - number of lookups per second

• path
• attr

9. hits - number of cache hits

• hits

10. attempts - authorization attemts

• success
• failure

11. cache - cached authorization hits

• hit
• miss

Sample:

localtcpip:
  name     : 'local'
  host     : '127.0.0.1'
  port     : 24242

localsocket:
  name     : 'local'
  socket   : '/var/run/dovecot/stats'

If no configuration is given, module will attempt to connect to dovecot using unix socket localized in /var/run/dovecot/stats

Simple module executing exim -bpc to grab exim queue. This command can take a lot of time to finish its execution thus it is not recommended to run it every second.

It produces only one chart:

1. Exim Queue Emails

• emails

Configuration is not needed.

Module monitors disk temperatures from one or more hddtemp daemons

Requirement: Running hddtemp in daemonized mode with access on tcp port

It produces one chart Temperature with dynamic number of dimensions (one per disk)

Sample:

update_every: 3
host: "127.0.0.1"
port: 7634

If no configuration is given, module will attempt to connect to hddtemp daemon on 127.0.0.1:7634 address

Module monitors IPFS basic information.

1. Bandwidth in kbits/s

• in
• out

2. Peers

• peers

Only url to IPFS server is needed.

Sample:

localhost:
  name : 'local'
  url  : 'http://localhost:5001'

Memcached monitoring module. Data grabbed from stats interface.

1. Network in kilobytes/s

• read
• written

2. Connections per second

• current
• rejected
• total

3. Items in cluster

• current
• total

4. Evicted and Reclaimed items

• evicted
• reclaimed

5. GET requests/s

• hits
• misses

6. GET rate rate in requests/s

• rate

7. SET rate rate in requests/s

• rate

8. DELETE requests/s

• hits
• misses

9. CAS requests/s

• hits
• misses
• bad value

10. Increment requests/s

• hits
• misses

11. Decrement requests/s

• hits
• misses

12. Touch requests/s

• hits
• misses

13. Touch rate rate in requests/s

• rate

Sample:

localtcpip:
  name     : 'local'
  host     : '127.0.0.1'
  port     : 24242

If no configuration is given, module will attempt to connect to memcached instance on 127.0.0.1:11211 address.

Module monitors one or more mysql servers

Requirements:

• python library MySQLdb (faster) or PyMySQL (slower)

It will produce following charts (if data is available):

1. Bandwidth in kbps

• in
• out

2. Queries in queries/sec

• queries
• questions
• slow queries

3. Operations in operations/sec

• opened tables
• flush
• commit
• delete
• prepare
• read first
• read key
• read next
• read prev
• read random
• read random next
• rollback
• save point
• update
• write

4. Table Locks in locks/sec

• immediate
• waited

5. Select Issues in issues/sec

• full join
• full range join
• range
• range check
• scan

6. Sort Issues in issues/sec

• merge passes
• range
• scan

You can provide, per server, the following:

1. username which have access to database (deafults to 'root')
2. password (defaults to none)
3. mysql my.cnf configuration file
4. mysql socket (optional)
5. mysql host (ip or hostname)
6. mysql port (defaults to 3306)

Here is an example for 3 servers:

update_every : 10
priority     : 90100
retries      : 5

local:
  'my.cnf'   : '/etc/mysql/my.cnf'
  priority   : 90000

local_2:
  user     : 'root'
  pass : 'blablablabla'
  socket   : '/var/run/mysqld/mysqld.sock'
  update_every : 1

remote:
  user     : 'admin'
  pass : 'bla'
  host     : 'example.org'
  port     : 9000
  retries  : 20

If no configuration is given, module will attempt to connect to mysql server via unix socket at /var/run/mysqld/mysqld.sock without password and with username root

This module will monitor one or more nginx servers depending on configuration.

Requirements:

• nginx with configured stub_status

It produces following charts:

1. Active Connections

• active

2. Requests in requests/s

• requests

3. Active Connections by Status

• reading
• writing
• waiting

4. Connections Rate in connections/s

• accepts
• handled

Needs only url to server's stub_status

Here is an example for local server:

update_every : 10
priority     : 90100

local:
  url     : 'http://localhost/stub_status'
  retries : 10

Without configuration, module attempts to connect to http://localhost/stub_status

Module monitors nginx access log and produces only one chart:

1. nginx status codes in requests/s

• 2xx
• 3xx
• 4xx
• 5xx

Sample for two vhosts:

site_A:
  path: '/var/log/nginx/access-A.log'

site_B:
  name: 'local'
  path: '/var/log/nginx/access-B.log'

When no configuration file is found, module tries to parse /var/log/nginx/access.log file.

This module will monitor one or more php-fpm instances depending on configuration.

Requirements:

• php-fpm with enabled status page
• access to status page via web server

It produces following charts:

1. Active Connections

• active
• maxActive
• idle

2. Requests in requests/s

• requests

3. Performance

• reached
• slow

Needs only url to server's status

Here is an example for local instance:

update_every : 3
priority     : 90100

local:
  url     : 'http://localhost/status'
  retries : 10

Without configuration, module attempts to connect to http://localhost/status

Simple module executing postfix -p to grab postfix queue.

It produces only two charts:

1. Postfix Queue Emails

• emails

2. Postfix Queue Emails Size in KB

• size

Configuration is not needed.

Get INFO data from redis instance.

Following charts are drawn:

1. Operations per second

• operations

2. Hit rate in percent

• rate

3. Memory utilization in kilobytes

• total
• lua

4. Database keys

• lines are creates dynamically based on how many databases are there

5. Clients

• connected
• blocked

6. Slaves

• connected

socket:
  name     : 'local'
  socket   : '/var/lib/redis/redis.sock'

localhost:
  name     : 'local'
  host     : 'localhost'
  port     : 6379

When no configuration file is found, module tries to connect to TCP/IP socket: localhost:6379.

System sensors information.

Charts are created dynamically.

For detailed configuration information please read sensors.conf file.

This module will monitor one or more squid instances depending on configuration.

It produces following charts:

1. Client Bandwidth in kilobits/s

• in
• out
• hits

2. Client Requests in requests/s

• requests
• hits
• errors

3. Server Bandwidth in kilobits/s

• in
• out

4. Server Requests in requests/s

• requests
• errors

priority     : 50000

local:
  request : 'cache_object://localhost:3128/counters'
  host    : 'localhost'
  port    : 3128

Without any configuration module will try to autodetect where squid presents its counters data

Present tomcat containers memory utilization.

Charts:

1. Requests per second

• accesses

2. Volume in KB/s

• volume

3. Threads

• current
• busy

4. JVM Free Memory in MB

• jvm

localhost:
  name : 'local'
  url  : 'http://127.0.0.1:8080/manager/status?XML=true'
  user : 'tomcat_username'
  pass : 'secret_tomcat_password'

Without configuration, module attempts to connect to http://localhost:8080/manager/status?XML=true, without any credentials. So it will probably fail.