reverse-proxy: T6434: Support additional healthcheck options

[Embezzle]

Change Summary

Add support for health checking additional protocols other than HTTP in reverse-proxy backends.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

https://vyos.dev/T6434

Related PR(s)

Component(s) name

load-balancing -> reverse-proxy

Proposed changes

How to test

1. Create a reverse-proxy configuration using the new options:

set load-balancing reverse-proxy backend bk-01 mode 'tcp'
set load-balancing reverse-proxy backend bk-01 server srv-01 address '192.0.2.11'
set load-balancing reverse-proxy backend bk-01 server srv-01 port '389'
set load-balancing reverse-proxy backend bk-01 server srv-01 check
set load-balancing reverse-proxy backend bk-01 health-check 'ldap'

set load-balancing reverse-proxy service fe-01 backend 'bk-01'
set load-balancing reverse-proxy service fe-01 mode 'tcp'
set load-balancing reverse-proxy service fe-01 port '389'

2. Check the HAProxy backend server configuration is showing the correct options:

vyos@vyos:~$ cat /var/run/haproxy/haproxy.cfg | grep '# Backend' -A 5
# Backend
backend bk-01
	option ldap-check
	balance roundrobin
	mode tcp
	server srv-01 192.0.2.11:389 check

Smoketest result

vyos@vyos:~$ python3 /usr/libexec/vyos/tests/smoke/cli/test_load-balancing_reverse-proxy.py
test_01_lb_reverse_proxy_domain (__main__.TestLoadBalancingReverseProxy.test_01_lb_reverse_proxy_domain) ... ok
test_02_lb_reverse_proxy_cert_not_exists (__main__.TestLoadBalancingReverseProxy.test_02_lb_reverse_proxy_cert_not_exists) ...
PKI does not contain any certificates!


Certificate "cert" not found in configuration!

ok
test_03_lb_reverse_proxy_ca_not_exists (__main__.TestLoadBalancingReverseProxy.test_03_lb_reverse_proxy_ca_not_exists) ...
PKI does not contain any CA certificates!


CA Certificate "ca-test" not found in configuration!

ok
test_04_lb_reverse_proxy_backend_ssl_no_verify (__main__.TestLoadBalancingReverseProxy.test_04_lb_reverse_proxy_backend_ssl_no_verify) ...
backend bk-01 cannot have both ssl options no-verify and ca-certificate
set!

ok
test_05_lb_reverse_proxy_backend_http_check (__main__.TestLoadBalancingReverseProxy.test_05_lb_reverse_proxy_backend_http_check) ...
backend "bk-01" can only be configured with ldap health-check whilst in
TCP mode!

ok
test_06_lb_reverse_proxy_tcp_mode (__main__.TestLoadBalancingReverseProxy.test_06_lb_reverse_proxy_tcp_mode) ... ok
test_07_lb_reverse_proxy_http_response_headers (__main__.TestLoadBalancingReverseProxy.test_07_lb_reverse_proxy_http_response_headers) ...
service https_front must be set to http mode to use
http_response_headers!

ok
test_08_lb_reverse_proxy_tcp_health_checks (__main__.TestLoadBalancingReverseProxy.test_08_lb_reverse_proxy_tcp_health_checks) ... ok

----------------------------------------------------------------------
Ran 8 tests in 37.243s

OK

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[sever-sever]

@Mergifyio backport sagitta

[mergify]

backport sagitta

✅ Backports have been created

• #3577 reverse-proxy: T6434: Support additional healthcheck options (backport #3574) has been created for branch sagitta