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

Synopsis

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

Parameters

Parameter Choices/Defaults Comments
backend
string
Name of the HAProxy backend pool.
If this parameter is unset, it will be auto-detected.
drain
boolean
added in 2.4
    Choices:
  • no
  • yes
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.
fail_on_not_found
boolean
    Choices:
  • no ←
  • yes
Fail whenever trying to enable/disable a backend host that does not exist
host
string / required
Name of the backend host to change.
shutdown_sessions
boolean
    Choices:
  • no ←
  • yes
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.
socket
path
Default:
"/var/run/haproxy.sock"
Path to the HAProxy socket file.
state
string / required
    Choices:
  • disabled
  • drain
  • enabled
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.
wait
boolean
    Choices:
  • no ←
  • yes
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
wait_interval
integer
Default:
5
Number of seconds to wait between retries.
wait_retries
integer
Default:
25
Number of times to check for status after changing the state.
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
  haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    backend: www

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

- name: Disable server, provide socket file
  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
  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.
- haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    socket: /var/run/haproxy.sock
    backend: www
    wait: yes
    drain: yes
    wait_interval: 1
    wait_retries: 60

- name: Disable backend server in 'www' backend pool and drop open sessions to it
  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
  haproxy:
    state: disabled
    host: '{{ inventory_hostname }}'
    fail_on_not_found: yes

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

- name: Enable server in 'www' backend pool wait until healthy
  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
  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
  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
  haproxy:
    state: drain
    host: '{{ inventory_hostname }}'
    socket: /var/run/haproxy.sock
    backend: www

Status

Authors

  • Ravi Bhure (@ravibhure)

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