Revert "Add incremental RST-to-MyST swap mechanism (circinus) (#1867)" (#1893)

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----
-lastproofread: '2026-04-06'
----
-
-# HAproxy
-
-```{include} /_include/need_improvement.txt
-```
-
-HAProxy is a load balancer and proxy server that provides
-high-availability, load balancing, and proxying for TCP (level 4) and
-HTTP-based (level 7) applications.
-
-## Configuration
-
-Service configuration specifies the port to bind to. Backend
-configuration defines the load balancing method and specifies the backend
-servers.
-
-### Service
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> listen-address
-   <address>
-
-  Set the IP address for the service to bind to. By default, the service
-  listens on all IPv4 and IPv6 addresses.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> port
-   <port>
-
-  Create service `<name>` to listen on <port>
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> mode
-   <tcp|http>
-
-  Configure service `<name>` mode TCP or HTTP
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> backend
-   <name>
-
-  Configure service `<name>` to use the backend <name>
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> ssl
-   certificate <name>
-
-  Set the SSL certificate <name> for service <name>. You can define
-  multiple certificates.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name>
-  http-response-headers <header-name> value <header-value>
-
-  Set custom HTTP headers to include in all responses.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> logging facility
-  <facility> level <level>
-
-  Specify facility and level for logging.
-  For an explanation on {ref}`syslog_facilities` and
-  {ref}`syslog_severity_level`,
-  see tables in the syslog configuration section.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> timeout client
-  <seconds>
-
-  Set the maximum inactivity time on the client side for this service.
-  Value range 1-3600 seconds.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> http-compression algorithm
-  <gzip | deflate | identity | raw-deflate>
-
-  Set the compression algorithm to be used when compressing HTTP responses.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> http-compression mime-type
-  <mime-type>
-
-  Set the list of HTTP response MIME types which haproxy will attempt to
-  compress, if received uncompressed from backend server.
-```
-
-#### Rules
-
-Rules control and route incoming traffic to specific backends based on
-predefined conditions. Rules define matching criteria and specify actions
-to perform.
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> rule <rule>
-   domain-name <name>
-
-  Match domain name
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> rule <rule>
-   ssl <sni>
-
-  SSL match Server Name Indication (SNI) option:
-   * ``req-ssl-sni`` SSL Server Name Indication (SNI) request match
-   * ``ssl-fc-sni`` SSL frontend connection Server Name Indication match
-   * ``ssl-fc-sni-end`` SSL frontend match end of connection Server Name
-
-      Indication
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> rule <rule>
-   url-path <match> <url>
-
-  Define URL path matching rules for a specific service. Use this command
-  to specify how to match the URL path against incoming requests.
-
-  The available options for <match> are:
-   * ``begin`` Matches the beginning of the URL path
-   * ``end`` Matches the end of the URL path.
-   * ``exact`` Matches the URL path exactly.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> rule <rule>
-   set backend <name>
-
-  Assign a specific backend to a rule
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy service <name> rule <rule>
-   redirect-location <url>
-
-  Redirect URL to a new location.
-
-```
-
-### Backend
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> balance
-   <balance>
-
-  Specify the load balancing algorithm for distributing requests among
-  available servers.
-
-  Balance algorithms:
-   * ``source-address`` Distributes requests based on the source IP address
-     of the client.
-   * ``round-robin`` Distributes requests in a circular manner,
-     sequentially sending each request to the next server in line.
-   * ``least-connection`` Distributes requests to the server with the fewest
-     active connections.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> mode
-   <mode>
-
-  Configure backend `<name>` mode TCP or HTTP.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> server
-   <name> address <x.x.x.x>
-
-  Set the address of the backend server that receives incoming traffic.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> server
-   <name> port <port>
-
-  Set the address of the backend port.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> server
-   <name> check
-
-  Active health check backend server.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> server
-   <name> check port <port>
-
-  Set an alternative port number for health checks.
-  Overrides the default server port used for TCP/HTTP checks.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> server
-   <name> send-proxy
-
-  Send a Proxy Protocol version 1 header (text format).
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> server
-   <name> send-proxy-v2
-
-  Send a Proxy Protocol version 2 header (binary format).
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> ssl
-   ca-certificate <ca-certificate>
-
-  Use SSL encryption for backend requests and authenticate the backend
-  against ``<ca-certificate>``.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> ssl no-verify
-
-  Use SSL encryption for backend requests without validating the server
-  certificate.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name>
-  http-response-headers <header-name> value <header-value>
-
-  Set custom HTTP headers to include in all responses from the backend.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> logging facility
-  <facility> level <level>
-
-  Specify facility and level for logging.
-  For an explanation on {ref}`syslog_facilities` and
-  {ref}`syslog_severity_level`,
-  see tables in the {ref}`syslog` configuration section.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> timeout check
-  <seconds>
-
-  Set the timeout in seconds for established connections.
-  Value range 1-3600 seconds.
-
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> timeout connect
-  <seconds>
-
-  Set the maximum time to wait for a connection attempt to a server to succeed.
-  Value range 1-3600 seconds.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> timeout server
-  <seconds>
-
-  Set the maximum inactivity time on the server side.
-  Value range 1-3600 seconds.
-
-
-```
-
-### Global
-
-Global configuration parameters:
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy global-parameters max-connections
-   <num>
-
-  Limit maximum number of connections
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy global-parameters ssl-bind-ciphers
-   <ciphers>
-
-  Limit the cipher algorithms allowed during SSL/TLS handshake.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy global-parameters tls-version-min
-   <version>
-
-  Specify the minimum required TLS version 1.2 or 1.3
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy global-parameters logging
-  facility <facility> level <level>
-
-  Specify facility and level for logging.
-  For an explanation on {ref}`syslog_facilities` and
-  {ref}`syslog_severity_level`
-  see tables in syslog configuration section.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy timeout check <seconds>
-
-  Set the timeout in seconds for established connections.
-  Value range 1-3600 seconds. Default is 5 seconds.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy timeout client <seconds>
-
-  Set the maximum inactivity time on the client side.
-  Value range 1-3600 seconds. Default is 50 seconds.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy timeout connect <seconds>
-
-  Set the maximum time to wait for a connection attempt to a server to succeed.
-  Value range 1-3600 seconds. Default is 10 seconds.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy timeout server <seconds>
-
-  Set the maximum inactivity time on the server side.
-  Value range 1-3600 seconds. Default is 50 seconds.
-```
-
-## Health checks
-
-### HTTP checks
-
-Use HTTP health checks to monitor web applications that provide health status
-information and determine their availability.
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> http-check
-
-  Enables HTTP health checks using OPTION HTTP requests against '/' and
-  expecting a successful response code in the 200-399 range.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> http-check
-   method <method>
-
-  Set the HTTP method: ``OPTION``, ``GET``, ``POST``, or ``PUT``.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> http-check
-   uri <path>
-
-  Set the endpoint to use for health checks.
-```
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> http-check
-   expect <condition>
-
-  Set the expected result condition for a server to be considered 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
-
-```
-
-### TCP checks
-
-Configure health checks for TCP mode backends. You can configure protocol-aware
-checks for a range of Layer 7 protocols:
-
-```{eval-rst}
-.. cfgcmd:: set load-balancing haproxy backend <name> health-check <protocol>
-
-  Available health check protocols:
-   * ``ldap`` LDAP protocol check.
-   * ``redis`` Redis protocol check.
-   * ``mysql`` MySQL protocol check.
-   * ``pgsql`` PostgreSQL protocol check.
-   * ``smtp`` SMTP protocol check.
-```
-
-:::{note}
-If you specify a server to check but do not configure a
-protocol, HAProxy performs a basic TCP health check. A server is online if
-it responds to a connection attempt with a valid `SYN/ACK` packet.
-:::
-
-## Redirect HTTP to HTTPS
-
-Configure a HAProxy service for HTTP that listens on port 80 and redirects
-incoming requests to HTTPS:
-
-```none
-set load-balancing haproxy service http port '80'
-set load-balancing haproxy service http redirect-http-to-https
-```
-
-You can use a different service name; in this example, `http` is just for
-convenience.
-
-## Examples
-
-### Level 4 balancing
-
-This configuration enables the TCP reverse proxy for the `my-tcp-api`
-service. Incoming TCP connections on port 8888 are load balanced across the
-backend servers (srv01 and srv02) using the round-robin load balancing
-algorithm.
-
-```none
-set load-balancing haproxy service my-tcp-api backend 'bk-01'
-set load-balancing haproxy service my-tcp-api mode 'tcp'
-set load-balancing haproxy service my-tcp-api port '8888'
-
-set load-balancing haproxy backend bk-01 balance 'round-robin'
-set load-balancing haproxy backend bk-01 mode 'tcp'
-
-set load-balancing haproxy backend bk-01 server srv01 address '192.0.2.11'
-set load-balancing haproxy backend bk-01 server srv01 port '8881'
-set load-balancing haproxy backend bk-01 server srv02 address '192.0.2.12'
-set load-balancing haproxy backend bk-01 server srv02 port '8882'
-```
-
-### Balancing based on domain name
-
-The following configuration demonstrates how to use VyOS
-to achieve load balancing based on the domain name:
-
-The HTTP service listens on TCP port 80.
-
-Rule 10 matches requests with the domain name `node1.example.com` and
-forwards them to the backend `bk-api-01`.
-
-Rule 20 matches requests with the domain name `node2.example.com` and
-forwards them to the backend `bk-api-02`.
-
-```none
-set load-balancing haproxy service http description 'bind app listen on 443 port'
-set load-balancing haproxy service http mode 'tcp'
-set load-balancing haproxy service http port '80'
-
-set load-balancing haproxy service http rule 10 domain-name 'node1.example.com'
-set load-balancing haproxy service http rule 10 set backend 'bk-api-01'
-set load-balancing haproxy service http rule 20 domain-name 'node2.example.com'
-set load-balancing haproxy service http rule 20 set backend 'bk-api-02'
-
-set load-balancing haproxy backend bk-api-01 description 'My API-1'
-set load-balancing haproxy backend bk-api-01 mode 'tcp'
-set load-balancing haproxy backend bk-api-01 server api01 address '127.0.0.1'
-set load-balancing haproxy backend bk-api-01 server api01 port '4431'
-set load-balancing haproxy backend bk-api-02 description 'My API-2'
-set load-balancing haproxy backend bk-api-02 mode 'tcp'
-set load-balancing haproxy backend bk-api-02 server api01 address '127.0.0.2'
-set load-balancing haproxy backend bk-api-02 server api01 port '4432'
-```
-
-### Terminate SSL
-
-The following configuration terminates SSL on the router.
-
-The `http` service listens on port 80 and redirects HTTP requests to
-HTTPS.
-
-The `https` service listens on port 443 with the `bk-default` backend
-and handles HTTPS traffic using the `cert` certificate for SSL termination.
-The HSTS header is set with a 1-year expiry to tell browsers to always use
-SSL for the site.
-
-Rule 10 matches requests with the exact URL path `/.well-known/xxx` and
-redirects them to `/certs/`.
-
-Rule 20 matches requests with URL paths ending in `/mail` or the exact
-path `/email/bar` and redirects them to `/postfix/`.
-
-Global parameters include a maximum connection limit of 4000 and a minimum
-TLS version of 1.3.
-
-```none
-set load-balancing haproxy service http description 'Force redirect to HTTPS'
-set load-balancing haproxy service http port '80'
-set load-balancing haproxy service http redirect-http-to-https
-
-set load-balancing haproxy service https backend 'bk-default'
-set load-balancing haproxy service https description 'listen on 443 port'
-set load-balancing haproxy service https mode 'http'
-set load-balancing haproxy service https port '443'
-set load-balancing haproxy service https ssl certificate 'cert'
-set load-balancing haproxy service https http-response-headers Strict-Transport-Security value 'max-age=31536000'
-
-set load-balancing haproxy service https rule 10 url-path exact '/.well-known/xxx'
-set load-balancing haproxy service https rule 10 set redirect-location '/certs/'
-set load-balancing haproxy service https rule 20 url-path end '/mail'
-set load-balancing haproxy service https rule 20 url-path exact '/email/bar'
-set load-balancing haproxy service https rule 20 set redirect-location '/postfix/'
-
-set load-balancing haproxy backend bk-default description 'Default backend'
-set load-balancing haproxy backend bk-default mode 'http'
-set load-balancing haproxy backend bk-default server sr01 address '192.0.2.23'
-set load-balancing haproxy backend bk-default server sr01 port '80'
-
-set load-balancing haproxy global-parameters max-connections '4000'
-set load-balancing haproxy global-parameters tls-version-min '1.3'
-```
-
-### SSL Bridging
-
-The following configuration terminates incoming HTTPS traffic on the router,
-then re-encrypts the traffic and sends it to the backend server via HTTPS.
-Use this when encryption is required for both paths but you do not want to
-install publicly trusted certificates on each backend server.
-
-Backend service certificates are checked against the certificate authority
-specified in the configuration, which could be an internal CA.
-
-The `https` service listens on port 443 with backend `bk-bridge-ssl` to
-handle HTTPS traffic. It uses certificate named `cert` for SSL termination.
-
-The `bk-bridge-ssl` backend connects to `sr01` server on port 443 via HTTPS
-and checks backend server has a valid certificate trusted by CA `cacert`
-
-```none
-set load-balancing haproxy service https backend 'bk-bridge-ssl'
-set load-balancing haproxy service https description 'listen on 443 port'
-set load-balancing haproxy service https mode 'http'
-set load-balancing haproxy service https port '443'
-set load-balancing haproxy service https ssl certificate 'cert'
-
-set load-balancing haproxy backend bk-bridge-ssl description 'SSL backend'
-set load-balancing haproxy backend bk-bridge-ssl mode 'http'
-set load-balancing haproxy backend bk-bridge-ssl ssl ca-certificate 'cacert'
-set load-balancing haproxy backend bk-bridge-ssl server sr01 address '192.0.2.23'
-set load-balancing haproxy backend bk-bridge-ssl server sr01 port '443'
-```
-
-### Balancing with HTTP health checks
-
-This configuration enables HTTP health checks for backend servers.
-
-```none
-set load-balancing haproxy service my-tcp-api backend 'bk-01'
-set load-balancing haproxy service my-tcp-api mode 'tcp'
-set load-balancing haproxy service my-tcp-api port '8888'
-
-set load-balancing haproxy backend bk-01 balance 'round-robin'
-set load-balancing haproxy backend bk-01 mode 'tcp'
-
-set load-balancing haproxy backend bk-01 http-check method 'get'
-set load-balancing haproxy backend bk-01 http-check uri '/health'
-set load-balancing haproxy backend bk-01 http-check expect 'status 200'
-
-set load-balancing haproxy backend bk-01 server srv01 address '192.0.2.11'
-set load-balancing haproxy backend bk-01 server srv01 port '8881'
-set load-balancing haproxy backend bk-01 server srv01 check
-set load-balancing haproxy backend bk-01 server srv02 address '192.0.2.12'
-set load-balancing haproxy backend bk-01 server srv02 port '8882'
-set load-balancing haproxy backend bk-01 server srv02 check port '8892'
-```