카타코더 Docker - Load Balancing Containers

1 개요[ | ]

카타코더 Docker - Load Balancing Containers
카타코더 Docker
# 🔗 제목
카타코더 Docker/2 e
🡵 카타코더 Docker - Manage Container Log Files
🡵 카타코더 Docker - Ensuring Container Uptime With Restart Policies
🡵 카타코더 Docker - Adding Docker Metadata & Labels
🡵 카타코더 Docker - Load Balancing Containers
🡵 카타코더 Docker - Orchestration using Docker Compose
🡵 카타코더 Docker - See Container Metrics With Docker Stats
🡵 카타코더 Docker - Creating Optimised Docker Images using Multi-Stage Builds
🡵 카타코더 Docker - Formatting PS Output
🡵 카타코더 Docker - Run Docker From Rootless Users
🡵 카타코더 Docker - Learn Docker Swarm 101
🡵 카타코더 Docker - Docker Swarm Mode Playground

2 NGINX Proxy[ | ]

$ docker run -d -p 80:80 -e DEFAULT_HOST=proxy.example -v /var/run/docker.sock:/tmp/docker.sock:ro --name nginx jwilder/nginx-proxy
c884bfe63c8abe1b7fddfe1a7ffd2a97770830d3a40cef809a70a2ac8db2b0a7
$ curl http://docker
<html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body bgcolor="white">
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>nginx/1.14.1</center>
</body>
</html>

3 Single Host[ | ]

$ docker run -d -p 80 -e VIRTUAL_HOST=proxy.example katacoda/docker-http-server
2fc6828eb8f34fa30d070cd49dbd5e7a44077abc717f5b56f17d29e3ae082b6e
$ curl http://docker
<h1>This request was processed by host: 2fc6828eb8f3</h1>

4 Cluster[ | ]

$ docker run -d -p 80 -e VIRTUAL_HOST=proxy.example katacoda/docker-http-server
a3a91d74125721f142ae755431ae4a935f9512ac00b69589b3d11b07e3b34eb2
$ curl http://docker
<h1>This request was processed by host: a3a91d741257</h1>

5 Generated NGINX Configuration[ | ]

$ docker exec nginx cat /etc/nginx/conf.d/default.conf
# If we receive X-Forwarded-Proto, pass it through; otherwise, pass along the
# scheme used to connect to this server
map $http_x_forwarded_proto $proxy_x_forwarded_proto {
  default $http_x_forwarded_proto;
  ''      $scheme;
}
# If we receive X-Forwarded-Port, pass it through; otherwise, pass along the
# server port the client connected to
map $http_x_forwarded_port $proxy_x_forwarded_port {
  default $http_x_forwarded_port;
  ''      $server_port;
}
# If we receive Upgrade, set Connection to "upgrade"; otherwise, deleteany
# Connection header that may have been passed to this server
map $http_upgrade $proxy_connection {
  default upgrade;
  '' close;
}
# Apply fix for very long server names
server_names_hash_bucket_size 128;
# Default dhparam
ssl_dhparam /etc/nginx/dhparam/dhparam.pem;
# Set appropriate X-Forwarded-Ssl header
map $scheme $proxy_x_forwarded_ssl {
  default off;
  https on;
}
gzip_types text/plain text/css application/javascript application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
log_format vhost '$host $remote_addr - $remote_user [$time_local] '
                 '"$request" $status $body_bytes_sent '
                 '"$http_referer" "$http_user_agent"';
access_log off;
resolver 8.8.8.8;
# HTTP 1.1 support
proxy_http_version 1.1;
proxy_buffering off;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $proxy_connection;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
proxy_set_header X-Forwarded-Ssl $proxy_x_forwarded_ssl;
proxy_set_header X-Forwarded-Port $proxy_x_forwarded_port;
# Mitigate httpoxy attack (see README for details)
proxy_set_header Proxy "";
server {
        server_name _; # This is just an invalid value which will nevertrigger on a real hostname.
        listen 80;
        access_log /var/log/nginx/access.log vhost;
        return 503;
}
# proxy.example
upstream proxy.example {
                                ## Can be connected with "bridge" network
                        # hopeful_kare
                        server 172.18.0.4:80;
                                ## Can be connected with "bridge" network
                        # silly_borg
                        server 172.18.0.3:80;
}
server {
        server_name proxy.example;
        listen 80 default_server;
        access_log /var/log/nginx/access.log vhost;
        location / {
                proxy_pass http://proxy.example;
        }
}
$ docker logs nginx
WARNING: /etc/nginx/dhparam/dhparam.pem was not found. A pre-generated dhparam.pem will be used for now while a new one
is being generated in the background.  Once the new dhparam.pem is in place, nginx will be reloaded.
forego     | starting dockergen.1 on port 5000
forego     | starting nginx.1 on port 5100
dockergen.1 | 2019/03/23 11:15:53 Generated '/etc/nginx/conf.d/default.conf' from 1 containers
dockergen.1 | 2019/03/23 11:15:53 Watching docker events
dockergen.1 | 2019/03/23 11:15:53 Contents of /etc/nginx/conf.d/default.conf did not change. Skipping notification 'nginx -s reload'
nginx.1    | docker 172.17.0.60 - - [23/Mar/2019:11:16:01 +0000] "GET /HTTP/1.1" 503 213 "-" "curl/7.47.0"
dockergen.1 | 2019/03/23 11:16:19 Received event start for container 2fc6828eb8f3
dockergen.1 | 2019/03/23 11:16:19 Generated '/etc/nginx/conf.d/default.conf' from 2 containers
dockergen.1 | 2019/03/23 11:16:19 Running 'nginx -s reload'
nginx.1    | docker 172.17.0.60 - - [23/Mar/2019:11:16:28 +0000] "GET /HTTP/1.1" 200 58 "-" "curl/7.47.0"
dockergen.1 | 2019/03/23 11:16:47 Received event start for container a3a91d741257
dockergen.1 | 2019/03/23 11:16:47 Generated '/etc/nginx/conf.d/default.conf' from 3 containers
dockergen.1 | 2019/03/23 11:16:47 Running 'nginx -s reload'
2019/03/23 11:16:52 [notice] 47#47: signal process started
Generating DH parameters, 2048 bit long safe prime, generator 2
This is going to take a long time
dhparam generation complete, reloading nginx
nginx.1    | docker 172.17.0.60 - - [23/Mar/2019:11:16:55 +0000] "GET /HTTP/1.1" 200 58 "-" "curl/7.47.0"
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