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authorAlex W <embezzle.dev@proton.me>2024-06-03 18:22:56 +0100
committerAlex W <embezzle.dev@proton.me>2024-06-03 18:22:56 +0100
commita5354a65be668f10136b2f65ba1c9a41bf2708ca (patch)
treee1a99c314607ee40783b2db4f3738d4c62f232af
parentc7adcd66b8bcef54d2eccef1036176530945a998 (diff)
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reverse-proxy: T6434: Support additional health-check protocols
-rw-r--r--docs/configuration/loadbalancing/reverse-proxy.rst61
1 files changed, 44 insertions, 17 deletions
diff --git a/docs/configuration/loadbalancing/reverse-proxy.rst b/docs/configuration/loadbalancing/reverse-proxy.rst
index 3edc4283..9cb49a7f 100644
--- a/docs/configuration/loadbalancing/reverse-proxy.rst
+++ b/docs/configuration/loadbalancing/reverse-proxy.rst
@@ -161,8 +161,34 @@ Backend
Set custom HTTP headers to be included in all responses using the backend
-HTTP health check
-^^^^^^^^^^^^^^^^^
+Global
+-------
+
+Global parameters
+
+.. cfgcmd:: set load-balancing reverse-proxy global-parameters max-connections
+ <num>
+
+ Limit maximum number of connections
+
+.. cfgcmd:: set load-balancing reverse-proxy global-parameters ssl-bind-ciphers
+ <ciphers>
+
+ Limit allowed cipher algorithms used during SSL/TLS handshake
+
+.. cfgcmd:: set load-balancing reverse-proxy global-parameters tls-version-min
+ <version>
+
+ Specify the minimum required TLS version 1.2 or 1.3
+
+
+Health checks
+=============
+
+
+HTTP checks
+-----------
+
For web application providing information about their state HTTP health
checks can be used to determine their availability.
@@ -185,31 +211,32 @@ checks can be used to determine their availability.
expect <condition>
Sets the expected result condition for considering a server healthy.
+
Some possible examples are:
* ``status 200`` Expecting a 200 response code
* ``status 200-399`` Expecting a non-failure response code
* ``string success`` Expecting the string `success` in the response body
-Global
--------
-
-Global parameters
-
-.. cfgcmd:: set load-balancing reverse-proxy global-parameters max-connections
- <num>
-
- Limit maximum number of connections
+TCP checks
+----------
-.. cfgcmd:: set load-balancing reverse-proxy global-parameters ssl-bind-ciphers
- <ciphers>
+Health checks can also be configured for TCP mode backends. You can configure
+protocol aware checks for a range of Layer 7 protocols:
- Limit allowed cipher algorithms used during SSL/TLS handshake
+.. cfgcmd:: set load-balancing reverse-proxy backend <name> health-check <protocol>
-.. cfgcmd:: set load-balancing reverse-proxy global-parameters tls-version-min
- <version>
+ Available health check protocols:
+ * ``ldap`` LDAP protocol check.
+ * ``redis`` Redis protocol check.
+ * ``mysql`` MySQL protocol check.
+ * ``pgsql`` PostgreSQL protocol check.
+ * ``smtp`` SMTP protocol check.
- Specify the minimum required TLS version 1.2 or 1.3
+.. note:: If you specify a server to be checked but do not configure a
+ protocol, a basic TCP health check will be attempted. A server shall be
+ deemed online if it responses to a connection attempt with a valid
+ ``SYN/ACK`` packet.
Redirect HTTP to HTTPS