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Merge pull request #691 from sever-sever/keepalived

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ha: Documentation for VRRP and virtual-server
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Robert Göhler 2022-01-11 20:08:48 +01:00 committed by GitHub
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docs/configuration/highavailability/index.rst
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@ -53,6 +53,18 @@ IPv6 support
The ``address`` parameter can be either an IPv4 or IPv6 address, but you can
not mix IPv4 and IPv6 in the same group, and will need to create groups with
different VRIDs specially for IPv4 and IPv6.
If you want to use IPv4 + IPv6 address you can use option ``excluded-address``
Address
-------
The ``address`` can be configured either on the VRRP interface or on not VRRP
interface.
.. code-block:: none
set high-availability vrrp group Foo address 192.0.2.1/24
set high-availability vrrp group Foo address 203.0.113.22/24 interface eth2
set high-availability vrrp group Foo address 198.51.100.33/24 interface eth3
Disabling a VRRP group
----------------------
@ -67,6 +79,19 @@ A disabled group will be removed from the VRRP process and your router will not
participate in VRRP for that VRID. It will disappear from operational mode
commands output, rather than enter the backup state.
Exclude address
---------------
Exclude IP addresses from ``VRRP packets``. This option ``excluded-address`` is
used when you want to set IPv4 + IPv6 addresses on the same virtual interface
or when used more than 20 IP addresses.
.. code-block:: none
set high-availability vrrp group Foo excluded-address '203.0.113.254/24'
set high-availability vrrp group Foo excluded-address '2001:db8:aa::1/64'
set high-availability vrrp group Foo excluded-address '2001:db8:22::1/64'
Setting VRRP group priority
---------------------------
@ -142,6 +167,23 @@ seconds, use:
set high-availability vrrp group Foo preempt-delay 180
Track
-----
Track option to track non VRRP interface states. VRRP changes status to
``FAULT`` if one of the track interfaces in state ``down``.
.. code-block:: none
set high-availability vrrp group Foo track interface eth0
set high-availability vrrp group Foo track interface eth1
Ignore VRRP main interface faults
.. code-block:: none
set high-availability vrrp group Foo track exclude-vrrp-interface
Unicast VRRP
------------
@ -217,3 +259,75 @@ and the ``/config/scripts/vrrp-master.sh`` when the router becomes the master:
set high-availability vrrp group Foo transition-script master "/config/scripts/vrrp-master.sh Foo"
To know more about scripting, check the :ref:`command-scripting` section.
Virtual-server
--------------
.. include:: /_include/need_improvement.txt
Virtual Server allows to Load-balance traffic destination virtual-address:port
between several real servers.
Algorithm
^^^^^^^^^
Load-balancing schedule algorithm:
* round-robin
* weighted-round-robin
* least-connection
* weighted-least-connection
* source-hashing
* destination-hashing
* locality-based-least-connection
.. code-block:: none
set high-availability virtual-server 203.0.113.1 algorithm 'least-connection'
Forward method
^^^^^^^^^^^^^^
* NAT
* direct
* tunnel
.. code-block:: none
set high-availability virtual-server 203.0.113.1 forward-method 'nat'
Real server
^^^^^^^^^^^
Real server IP address and port
.. code-block:: none
set high-availability virtual-server 203.0.113.1 real-server 192.0.2.11 port '80'
Example
^^^^^^^
Virtual-server can be configured with VRRP virtual address or without VRRP.
In the next example all traffic destined to ``203.0.113.1`` and port ``8280``
protocol TCP is balanced between 2 real servers ``192.0.2.11`` and
``192.0.2.12`` to port ``80``
Real server is auto-excluded if port check with this server fail.
.. code-block:: none
set interfaces ethernet eth0 address '203.0.113.11/24'
set interfaces ethernet eth1 address '192.0.2.1/24'
set high-availability vrrp group FOO interface 'eth0'
set high-availability vrrp group FOO no-preempt
set high-availability vrrp group FOO priority '150'
set high-availability vrrp group FOO address '203.0.113.1/24'
set high-availability vrrp group FOO vrid '10'
set high-availability virtual-server 203.0.113.1 algorithm 'source-hashing'
set high-availability virtual-server 203.0.113.1 delay-loop '10'
set high-availability virtual-server 203.0.113.1 forward-method 'nat'
set high-availability virtual-server 203.0.113.1 persistence-timeout '180'
set high-availability virtual-server 203.0.113.1 port '8280'
set high-availability virtual-server 203.0.113.1 protocol 'tcp'
set high-availability virtual-server 203.0.113.1 real-server 192.0.2.11 port '80'
set high-availability virtual-server 203.0.113.1 real-server 192.0.2.12 port '80'