AKAI TSUKI

System development or Technical something

try nginx for reverse proxy

Nginx

try Nginx

ref. https://serverfault.com/questions/760569/sent-http-variables-disappear-in-nginx-in-some-circumstances

client -> nginx -> httpd

apache httpd

docker images

[root@vm01 work_a]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               1.17.8              2073e0bcb60e        2 weeks ago         127MB
httpd               2.4.41              c562eeace183        2 weeks ago         165MB
hello-world         latest              fce289e99eb9        13 months ago       1.84kB
[root@vm01 work_a]#

index.html (sample)

[root@vm01 work_a]# cat index.html
<!DOCTYPE html>
<html>
<head>
  <title>test title</title>
</head>
<body>
  <h1>Header</h1>
  <p>This is test message.</p>
</body>
</html>

[root@vm01 work_a]#

docker run for httpd

[root@vm01 work_a]# ls -l
total 4
-rw-r--r-- 1 root root 139 Feb 18 12:00 index.html
[root@vm01 work_a]#
[root@vm01 work_a]# docker run -dit --name my-a -v "$PWD":/usr/local/apache2/htdocs/ httpd:2.4.41
78b09dbbfafc21c5eb40e4ba25797735fa93f6e9fb6b175b6013c0a8fd468478
[root@vm01 work_a]#
[root@vm01 work_a]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
78b09dbbfafc        httpd:2.4.41        "httpd-foreground"       4 seconds ago       Up 3 seconds        80/tcp              my-a
[root@vm01 work_a]#

[root@vm01 work_a]# docker inspect --format '{{ .NetworkSettings.IPAddress }}' my-a
172.17.0.2
[root@vm01 work_a]#

check to send request

[root@vm01 work_a]# curl -v http://172.17.0.2/
* About to connect() to 172.17.0.2 port 80 (#0)
*   Trying 172.17.0.2...
* Connected to 172.17.0.2 (172.17.0.2) port 80 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 172.17.0.2
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Tue, 18 Feb 2020 03:09:08 GMT
< Server: Apache/2.4.41 (Unix)
< Last-Modified: Tue, 18 Feb 2020 03:00:51 GMT
< ETag: "8b-59ed0e1267770"
< Accept-Ranges: bytes
< Content-Length: 139
< Content-Type: text/html
<
<!DOCTYPE html>
<html>
<head>
  <title>test title</title>
</head>
<body>
  <h1>Header</h1>
  <p>This is test message.</p>
</body>
</html>

* Connection #0 to host 172.17.0.2 left intact
[root@vm01 work_a]#

basic config

config for nginx

[root@vm01 work_n]# ls -l
total 4
-rw-r--r-- 1 root root 775 Feb 18 11:35 nginx.conf
[root@vm01 work_n]#
[root@vm01 work_n]# cat nginx.conf
user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"'
                      'response_context "$sent_http_content_type" '
                      'etag "$sent_http_etag" ';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

#    include /etc/nginx/conf.d/*.conf;

    server {
        listen 80;

        location /apache/ {
            proxy_pass http://my-a/;
        }
    }
}

[root@vm01 work_n]#

run nginx container

[root@vm01 work_n]# docker run --rm --name my-n -v /root/work_n/nginx.conf:/etc/nginx/nginx.conf:ro -it --link my-a nginx:1.17.8

check request

I got httpd response via nginx(reverse proxy).

[root@vm01 work_n]# curl -v http://172.17.0.3/apache/index.html
* About to connect() to 172.17.0.3 port 80 (#0)
*   Trying 172.17.0.3...
* Connected to 172.17.0.3 (172.17.0.3) port 80 (#0)
> GET /apache/index.html HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 172.17.0.3
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.17.8
< Date: Tue, 18 Feb 2020 03:42:45 GMT
< Content-Type: text/html
< Content-Length: 139
< Connection: keep-alive
< Last-Modified: Tue, 18 Feb 2020 03:00:51 GMT
< ETag: "8b-59ed0e1267770"
< Accept-Ranges: bytes
<
<!DOCTYPE html>
<html>
<head>
  <title>test title</title>
</head>
<body>
  <h1>Header</h1>
  <p>This is test message.</p>
</body>
</html>

* Connection #0 to host 172.17.0.3 left intact
[root@vm01 work_n]#

get access log

[root@vm01 work_n]# docker run --rm --name my-n -v /root/work_n/nginx.conf:/etc/nginx/nginx.conf:ro -it --link my-a nginx:1.17.8
172.17.0.1 - - [18/Feb/2020:03:42:45 +0000] "GET /apache/index.html HTTP/1.1" 200 139 "-" "curl/7.29.0" "-"response_context "text/html" etag "\x228b-59ed0e1267770\x22"

sample case 2

config

[root@vm01 work_n]# cat nginx.conf
user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"'
                      'response_context "$sent_http_content_type" '
                      'etag "$sent_http_etag" ';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    #include /etc/nginx/conf.d/*.conf;

    server {
        listen 80;

        location /apache/ {
            proxy_pass http://my-a/;

            set $debug_msg $sent_http_etag;

            add_header X-debug-message "this is debug message for /apache/";
        }
    }
}

[root@vm01 work_n]#

request

after docker run, I sent request.

[root@vm01 work_n]# curl -v http://172.17.0.3/apache/index.html
* About to connect() to 172.17.0.3 port 80 (#0)
*   Trying 172.17.0.3...
* Connected to 172.17.0.3 (172.17.0.3) port 80 (#0)
> GET /apache/index.html HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 172.17.0.3
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.17.8
< Date: Tue, 18 Feb 2020 03:56:14 GMT
< Content-Type: text/html
< Content-Length: 139
< Connection: keep-alive
< Last-Modified: Tue, 18 Feb 2020 03:00:51 GMT
< ETag: "8b-59ed0e1267770"
< Accept-Ranges: bytes
< X-debug-message: this is debug message for /apache/
<
<!DOCTYPE html>
<html>
<head>
  <title>test title</title>
</head>
<body>
  <h1>Header</h1>
  <p>This is test message.</p>
</body>
</html>

* Connection #0 to host 172.17.0.3 left intact
[root@vm01 work_n]#

log

The "etag" value is empty("-") as follows:

[root@vm01 work_n]# docker run --rm --name my-n -v /root/work_n/nginx.conf:/etc/nginx/nginx.conf:ro -it --link my-a nginx:1.17.8
172.17.0.1 - - [18/Feb/2020:03:56:14 +0000] "GET /apache/index.html HTTP/1.1" 200 139 "-" "curl/7.29.0" "-"response_context "text/html" etag "-"

sample case 3

config

[root@vm01 work_n]# cat nginx.conf
user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"'
                      'response_context "$sent_http_content_type" '
                      'etag "$sent_http_etag" ';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    #include /etc/nginx/conf.d/*.conf;

    map $sent_http_etag $debug_msg {
        default $sent_http_etag;
    }

    server {
        listen 80;

        location /apache/ {
            proxy_pass http://my-a/;

            add_header X-debug-message "this is debug message for /apache/ $debug_msg";
        }
    }
}

[root@vm01 work_n]#

docker run & send request & check response

[root@vm01 work_n]# docker run --rm --name my-n -v /root/work_n/nginx.conf:/etc/nginx/nginx.conf:ro -it --link my-a nginx:1.17.8
172.17.0.1 - - [18/Feb/2020:04:15:07 +0000] "GET /apache/index.html HTTP/1.1" 200 139 "-" "curl/7.29.0" "-"response_context "text/html" etag "\x228b-59ed0e1267770\x22"

I got "debug_msg" from "$sent_http_etag" var.

[root@vm01 work_n]# curl -v http://172.17.0.3/apache/index.html
* About to connect() to 172.17.0.3 port 80 (#0)
*   Trying 172.17.0.3...
* Connected to 172.17.0.3 (172.17.0.3) port 80 (#0)
> GET /apache/index.html HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 172.17.0.3
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.17.8
< Date: Tue, 18 Feb 2020 04:15:07 GMT
< Content-Type: text/html
< Content-Length: 139
< Connection: keep-alive
< Last-Modified: Tue, 18 Feb 2020 03:00:51 GMT
< ETag: "8b-59ed0e1267770"
< Accept-Ranges: bytes
< X-debug-message: this is debug message for /apache/ "8b-59ed0e1267770"
<
<!DOCTYPE html>
<html>
<head>
  <title>test title</title>
</head>
<body>
  <h1>Header</h1>
  <p>This is test message.</p>
</body>
</html>

* Connection #0 to host 172.17.0.3 left intact
[root@vm01 work_n]#