Josh Knapp
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When Docker containers restart, they can get new IPs on the bridge network. HAProxy caches DNS at config load time, so stale IPs cause 503s until config is regenerated. Added a 'docker_dns' resolvers section pointing to Docker's embedded DNS (127.0.0.11) with 10s hold time. Backend servers now use 'resolvers docker_dns init-addr last,libc,none' so HAProxy: - Re-resolves container names every 10 seconds - Falls back to last known IP if DNS is temporarily unavailable - Starts even if a backend can't be resolved yet (init-addr none) This eliminates 503s from container restarts, scaling, and recreation without requiring a HAProxy config regeneration. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
41 lines
1.9 KiB
Smarty
41 lines
1.9 KiB
Smarty
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# Regular HTTP backend - uses http-server-close for better security and connection management
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backend {{ name }}-backend
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option forwardfor
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# Pass the real client IP to backend (from proxy headers or direct connection)
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# This is crucial for container-level logging and security tools
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http-request add-header X-CLIENT-IP %[var(txn.real_ip)]
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http-request set-header X-Real-IP %[var(txn.real_ip)]
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http-request set-header X-Forwarded-For %[var(txn.real_ip)]
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http-request set-header X-Forwarded-Proto https if { ssl_fc }
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http-request set-header X-Forwarded-Proto http if !{ ssl_fc }
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{% for server in servers %}
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server {{ server.server_name }} {{ server.server_address }}:{{ server.server_port }} {{ server.server_options }} resolvers docker_dns init-addr last,libc,none
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{% endfor %}
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# SSE-specific backend - optimized for Server-Sent Events long-lived connections
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backend {{ name }}-sse-backend
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# Disable http-server-close to allow SSE long-lived connections
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no option http-server-close
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# Enable http-no-delay for immediate data transmission
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option http-no-delay
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# Extended timeouts to support SSE long-lived connections (up to 6 hours)
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# Note: SSE sends keepalives every 1 second, so timeout only triggers if backend hangs
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timeout server 6h
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timeout http-keep-alive 6h
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option forwardfor
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# Pass the real client IP to backend (from proxy headers or direct connection)
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http-request add-header X-CLIENT-IP %[var(txn.real_ip)]
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http-request set-header X-Real-IP %[var(txn.real_ip)]
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http-request set-header X-Forwarded-For %[var(txn.real_ip)]
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http-request set-header X-Forwarded-Proto https if { ssl_fc }
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http-request set-header X-Forwarded-Proto http if !{ ssl_fc }
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{% for server in servers %}
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server {{ server.server_name }} {{ server.server_address }}:{{ server.server_port }} {{ server.server_options }} resolvers docker_dns init-addr last,libc,none
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{% endfor %}
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