community.general.haproxy – Enable, disable, and set weights for HAProxy backend servers using socket commands

Note

This plugin is part of the community.general collection (version 3.8.3).

You might already have this collection installed if you are using the ansible package. It is not included in ansible-core. To check whether it is installed, run ansible-galaxy collection list.

To install it, use: ansible-galaxy collection install community.general.

To use it in a playbook, specify: community.general.haproxy.

Synopsis

  • Enable, disable, drain and set weights for HAProxy backend servers using socket commands.

Parameters

Parameter

Comments

agent

boolean

added in 1.0.0 of community.general

Disable/enable agent checks (depending on state value).

Choices:

  • no ← (default)

  • yes

backend

string

Name of the HAProxy backend pool.

If this parameter is unset, it will be auto-detected.

drain

boolean

Wait until the server has no active connections or until the timeout determined by wait_interval and wait_retries is reached.

Continue only after the status changes to ‘MAINT’.

This overrides the shutdown_sessions option.

Choices:

  • no ← (default)

  • yes

fail_on_not_found

boolean

Fail whenever trying to enable/disable a backend host that does not exist

Choices:

  • no ← (default)

  • yes

health

boolean

added in 1.0.0 of community.general

Disable/enable health checks (depending on state value).

Choices:

  • no ← (default)

  • yes

host

string / required

Name of the backend host to change.

shutdown_sessions

boolean

When disabling a server, immediately terminate all the sessions attached to the specified server.

This can be used to terminate long-running sessions after a server is put into maintenance mode. Overridden by the drain option.

Choices:

  • no ← (default)

  • yes

socket

path

Path to the HAProxy socket file.

Default: “/var/run/haproxy.sock”

state

string / required

Desired state of the provided backend host.

Note that drain state was added in version 2.4.

It is supported only by HAProxy version 1.5 or later,

When used on versions < 1.5, it will be ignored.

Choices:

  • disabled

  • drain

  • enabled

wait

boolean

Wait until the server reports a status of ‘UP’ when state=enabled, status of ‘MAINT’ when state=disabled or status of ‘DRAIN’ when state=drain

Choices:

  • no ← (default)

  • yes

wait_interval

integer

Number of seconds to wait between retries.

Default: 5

wait_retries

integer

Number of times to check for status after changing the state.

Default: 25

weight

string

The value passed in argument.

If the value ends with the % sign, then the new weight will be relative to the initially configured weight.

Relative weights are only permitted between 0 and 100% and absolute weights are permitted between 0 and 256.

Notes

Note

  • Enable, disable and drain commands are restricted and can only be issued on sockets configured for level ‘admin’. For example, you can add the line ‘stats socket /var/run/haproxy.sock level admin’ to the general section of haproxy.cfg. See http://haproxy.1wt.eu/download/1.5/doc/configuration.txt.

  • Depends on netcat (nc) being available; you need to install the appropriate package for your operating system before this module can be used.

Examples

- name: Disable server in 'www' backend pool
  community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    backend: www

- name: Disable server in 'www' backend pool, also stop health/agent checks
  community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    health: yes
    agent: yes

- name: Disable server without backend pool name (apply to all available backend pool)
  community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'

- name: Disable server, provide socket file
  community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    socket: /var/run/haproxy.sock
    backend: www

- name: Disable server, provide socket file, wait until status reports in maintenance
  community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    socket: /var/run/haproxy.sock
    backend: www
    wait: yes

# Place server in drain mode, providing a socket file.  Then check the server's
# status every minute to see if it changes to maintenance mode, continuing if it
# does in an hour and failing otherwise.
- community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    socket: /var/run/haproxy.sock
    backend: www
    wait: yes
    drain: yes
    wait_interval: 60
    wait_retries: 60

- name: Disable backend server in 'www' backend pool and drop open sessions to it
  community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    backend: www
    socket: /var/run/haproxy.sock
    shutdown_sessions: yes

- name: Disable server without backend pool name (apply to all available backend pool) but fail when the backend host is not found
  community.general.haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    fail_on_not_found: yes

- name: Enable server in 'www' backend pool
  community.general.haproxy:
    state: enabled
    host: '{{ inventory_hostname }}'
    backend: www

- name: Enable server in 'www' backend pool wait until healthy
  community.general.haproxy:
    state: enabled
    host: '{{ inventory_hostname }}'
    backend: www
    wait: yes

- name: Enable server in 'www' backend pool wait until healthy. Retry 10 times with intervals of 5 seconds to retrieve the health
  community.general.haproxy:
    state: enabled
    host: '{{ inventory_hostname }}'
    backend: www
    wait: yes
    wait_retries: 10
    wait_interval: 5

- name: Enable server in 'www' backend pool with change server(s) weight
  community.general.haproxy:
    state: enabled
    host: '{{ inventory_hostname }}'
    socket: /var/run/haproxy.sock
    weight: 10
    backend: www

- name: Set the server in 'www' backend pool to drain mode
  community.general.haproxy:
    state: drain
    host: '{{ inventory_hostname }}'
    socket: /var/run/haproxy.sock
    backend: www

Authors

  • Ravi Bhure (@ravibhure)