first commit

Dockerfile

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+# Copyright 2015 The Kubernetes Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#FROM nginx:1.24.0-alpine3.17-slim
+#FROM nginx:1.26.1-alpine3.19-slim
+#RUN apk add --no-cache nginx-mod-http-lua
+#FROM fabiocicerchia/nginx-lua:1.27.0-alpine3.20.1
+#RUN rm -rf /etc/nginx/conf.d
+#FROM nginx:1.26.1-alpine3.19-slim
+#FROM nginx:1.27.0-alpine3.19
+#RUN apk update && apk add --no-cache nginx-plus-module-lua
+#ADD nginx.conf /etc/nginx/nginx.conf
+#ADD README.md README.md
+
+FROM alpine:3.17.8
+
+RUN apk add --no-cache nginx-mod-http-lua
+
+# Create folder for PID file
+RUN mkdir -p /run/nginx
+
+# Add custom nginx conf
+COPY ./nginx.conf /etc/nginx/nginx.conf
+
+ENTRYPOINT ["nginx"]
+CMD ["-c", "/etc/nginx/nginx.conf"]

README.md

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+# Echoserver
+
+This is a simple server that responds with the http headers it received.
+Image versions >= 1.4 removes the redirect introduced in 1.3.
+Image versions >= 1.3 redirect requests on :80 with `X-Forwarded-Proto: http` to :443.
+Image versions > 1.0 run an nginx server, and implement the echoserver using lua in the nginx config.
+Image versions <= 1.0 run a python http server instead of nginx, and don't redirect any requests.

nginx.conf

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+load_module /usr/lib/nginx/modules/ndk_http_module.so;
+load_module /usr/lib/nginx/modules/ngx_http_lua_module.so;
+
+pcre_jit on;
+
+events {
+	worker_connections 1024;
+}
+
+env HOSTNAME;
+env NODE_NAME;
+env POD_NAME;
+env POD_NAMESPACE;
+env POD_IP;
+
+http {
+	default_type 'text/plain';
+	# maximum allowed size of the client request body. By default this is 1m.
+	# Request with bigger bodies nginx will return error code 413.
+	# http://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size
+	client_max_body_size 10m;
+
+	init_by_lua_block {
+		local template = require("template")
+		-- template syntax documented here:
+		-- https://github.com/bungle/lua-resty-template/blob/master/README.md
+		tmpl = template.compile([[
+
+
+Hostname: {{os.getenv("HOSTNAME") or "N/A"}}
+
+Pod Information:
+{% if os.getenv("POD_NAME") then %}
+	node name:	{{os.getenv("NODE_NAME") or "N/A"}}
+	pod name:	{{os.getenv("POD_NAME") or "N/A"}}
+	pod namespace:	{{os.getenv("POD_NAMESPACE") or "N/A"}}
+	pod IP:	{{os.getenv("POD_IP") or "N/A"}}
+{% else %}
+	-no pod information available-
+{% end %}
+
+Server values:
+	server_version=nginx: {{ngx.var.nginx_version}} - lua: {{ngx.config.ngx_lua_version}}
+
+Request Information:
+	client_address={{ngx.var.remote_addr}}
+	method={{ngx.req.get_method()}}
+	real path={{ngx.var.request_uri}}
+	query={{ngx.var.query_string or ""}}
+	request_version={{ngx.req.http_version()}}
+	request_scheme={{ngx.var.scheme}}
+	request_uri={{ngx.var.scheme.."://"..ngx.var.host..":"..ngx.var.server_port..ngx.var.request_uri}}
+
+Request Headers:
+{% for i, key in ipairs(keys) do %}
+	{{key}}={{headers[key]}}
+{% end %}
+
+Request Body:
+{{ngx.var.request_body or "	-no body in request-"}}
+]])
+	}
+
+	server {
+		# please check the benefits of reuseport https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1
+		# basically instructs to create an individual listening socket for each worker process (using the SO_REUSEPORT
+		# socket option), allowing a kernel to distribute incoming connections between worker processes.
+		listen 8080 default_server reuseport;
+		listen 8443 default_server ssl http2 reuseport;
+
+		ssl_certificate /certs/certificate.crt;
+		ssl_certificate_key /certs/privateKey.key;
+
+		# Replace '_' with your hostname.
+		server_name _;
+
+		location / {
+			lua_need_request_body on;
+			content_by_lua_block {
+				ngx.header["Server"] = "echoserver"
+
+				local headers = ngx.req.get_headers()
+				local keys = {}
+				for key, val in pairs(headers) do
+					table.insert(keys, key)
+				end
+				table.sort(keys)
+
+				ngx.say(tmpl({os=os, ngx=ngx, keys=keys, headers=headers}))
+			}
+		}
+	}
+}