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fix: Generate at most one server directive per container

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This commit is contained in:
Richard Hansen
2023-01-28 00:19:21 -05:00
parent bcec2d9075
commit 6162427c45
3 changed files with 50 additions and 7 deletions
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23
nginx.tmpl
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@ -118,6 +118,7 @@ upstream {{ .Upstream }} {
# Container: {{ $container.Name }}
{{- /* If only 1 port exposed, use that as a default, else 80 */}}
{{- $defaultPort := (when (eq (len $container.Addresses) 1) (first $container.Addresses) (dict "Port" "80")).Port }}
{{- $ip := "" }}
{{- $port := (coalesce $container.Env.VIRTUAL_PORT $defaultPort) }}
{{- $addr_obj := where $container.Addresses "Port" $port | first }}
# Exposed ports:{{ range $container.Addresses }} {{ .Port }}/{{ .Proto }}{{ else }} (none){{ end }}
@ -141,23 +142,37 @@ upstream {{ .Upstream }} {
# {{ $containerNetwork.Name }} (unreachable)
{{- continue }}
{{- end }}
{{- /*
* Do not emit multiple `server` directives for this container
* if it is reachable over multiple networks. This avoids
* accidentally inflating the effective round-robin weight of
* this container due to the redundant upstreams that nginx sees
* as belonging to distinct servers.
*/}}
{{- if $ip }}
# {{ $containerNetwork.Name }} (ignored; reachable but redundant)
{{- continue }}
{{- end }}
# {{ $containerNetwork.Name }} (reachable)
{{- /*
* If we got the containers from swarm and this container's
* port is published to host, use host IP:PORT.
*/}}
{{- if and $container.Node.ID $addr_obj $addr_obj.HostPort }}
{{- $server_found = true }}
server {{ $container.Node.Address.IP }}:{{ $addr_obj.HostPort }};
{{- $ip = $container.Node.Address.IP }}
{{- $port = $addr_obj.HostPort }}
{{- else if and $containerNetwork $containerNetwork.IP }}
{{- $server_found = true }}
server {{ $containerNetwork.IP }}:{{ $port }};
{{- $ip = $containerNetwork.IP }}
{{- else }}
# /!\ No IP for this network!
{{- end }}
{{- else }}
# (none)
{{- end }}
{{- if $ip }}
{{- $server_found = true }}
server {{ $ip }}:{{ $port }};
{{- end }}
{{- end }}
{{- /* nginx-proxy/nginx-proxy#1105 */}}
{{- if not $server_found }}