Kubernetesは常に503サービスを提供しますが、複数のTLS Ingressでは一時的に利用できません
Amazon Web Servicesでkopsによってkubernetesクラスターをセットアップしています
2つのサイトを設定しています。 1つはSSL/TLS/httpsで保護され、もう1つはhttpのみです。どちらもWordpressサイトです。ドメインはサイトIDを保護するために変更されました
入力構成：
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: my-rules
spec:
tls:
- hosts:
- site1.com
secretName: site1-tls-secret
- hosts:
- www.site1.com
secretName: site1-tls-secret
rules:
- Host: site1.com
http:
paths:
- path: /
backend:
serviceName: site1
servicePort: 80
- Host: www.site1.com
http:
paths:
- path: /
backend:
serviceName: site1
servicePort: 80
- Host: blog.site2.com
http:
paths:
- path: /
backend:
serviceName: site2
servicePort: 80
イングレスサービス
apiVersion: v1
kind: Service
metadata:
name: nginx-ingress
labels:
app: nginx-ingress
k8s-addon: ingress-nginx.addons.k8s.io
annotations:
service.beta.kubernetes.io/aws-load-balancer-backend-protocol: 'tcp'
service.beta.kubernetes.io/aws-load-balancer-proxy-protocol: '*'
service.beta.kubernetes.io/aws-load-balancer-ssl-ports: '443'
spec:
type: LoadBalancer
ports:
- name: http
port: 80
targetPort: 80
- name: https
port: 443
targetPort: 443
selector:
app: nginx-ingress
Ingressの導入：
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: nginx-ingress
spec:
replicas: 1
template:
metadata:
labels:
app: nginx-ingress
spec:
containers:
- name: nginx-ingress
image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.11
imagePullPolicy: Always
readinessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
livenessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 10
timeoutSeconds: 1
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
ports:
- containerPort: 80
hostPort: 80
args:
- /nginx-ingress-controller
- --default-backend-service=$(POD_NAMESPACE)/echoheaders-default
- --configmap=$(POD_NAMESPACE)/nginx-load-balancer-conf
生成されたnginx.conf
daemon off;
worker_processes 1;
pid /run/nginx.pid;
worker_rlimit_nofile 1047552;
events {
multi_accept on;
worker_connections 16384;
use epoll;
}
http {
set_real_ip_from 0.0.0.0/0;
real_ip_header proxy_protocol;
real_ip_recursive on;
geoip_country /etc/nginx/GeoIP.dat;
geoip_city /etc/nginx/GeoLiteCity.dat;
geoip_proxy_recursive on;
# lua section to return proper error codes when custom pages are used
lua_package_path '.?.lua;/etc/nginx/lua/?.lua;/etc/nginx/lua/vendor/lua-resty-http/lib/?.lua;';
init_by_lua_block {
require("error_page")
}
sendfile on;
aio threads;
tcp_nopush on;
tcp_nodelay on;
log_subrequest on;
reset_timedout_connection on;
keepalive_timeout 75s;
keepalive_requests 100;
client_header_buffer_size 1k;
large_client_header_buffers 4 8k;
client_body_buffer_size 8k;
http2_max_field_size 4k;
http2_max_header_size 16k;
types_hash_max_size 2048;
server_names_hash_max_size 1024;
server_names_hash_bucket_size 64;
map_hash_bucket_size 64;
proxy_headers_hash_max_size 512;
proxy_headers_hash_bucket_size 64;
variables_hash_bucket_size 64;
variables_hash_max_size 2048;
underscores_in_headers off;
ignore_invalid_headers on;
include /etc/nginx/mime.types;
default_type text/html;
gzip on;
gzip_comp_level 5;
gzip_http_version 1.1;
gzip_min_length 256;
gzip_types application/atom+xml application/javascript application/x-javascr
ipt application/json application/rss+xml application/vnd.ms-fontobject applicati
on/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml applicat
ion/xml font/opentype image/svg+xml image/x-icon text/css text/plain text/x-comp
onent;
gzip_proxied any;
# Custom headers for response
server_tokens on;
# disable warnings
uninitialized_variable_warn off;
log_format upstreaminfo '$the_real_ip - [$the_real_ip] - $remote_user [$time
_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" $
request_length $request_time [$proxy_upstream_name] $upstream_addr $upstream_res
ponse_length $upstream_response_time $upstream_status';
map $request_uri $loggable {
default 1;
}
access_log /var/log/nginx/access.log upstreaminfo if=$loggable;
error_log /var/log/nginx/error.log notice;
resolver 100.64.0.10 valid=30s;
# Retain the default nginx handling of requests without a "Connection" heade
r
map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}
# trust http_x_forwarded_proto headers correctly indicate ssl offloading
map $http_x_forwarded_proto $pass_access_scheme {
default $http_x_forwarded_proto;
'' $scheme;
}
map $http_x_forwarded_port $pass_server_port {
default $http_x_forwarded_port;
'' $server_port;
}
map $http_x_forwarded_for $the_real_ip {
default $http_x_forwarded_for;
'' $proxy_protocol_addr;
}
# map port 442 to 443 for header X-Forwarded-Port
map $pass_server_port $pass_port {
442 443;
default $pass_server_port;
}
# Map a response error watching the header Content-Type
map $http_accept $httpAccept {
default html;
application/json json;
application/xml xml;
text/plain text;
}
map $httpAccept $httpReturnType {
default text/html;
json application/json;
xml application/xml;
text text/plain;
}
# Obtain best http Host
map $http_Host $this_Host {
default $http_Host;
'' $Host;
}
map $http_x_forwarded_Host $best_http_Host {
default $http_x_forwarded_Host;
'' $this_Host;
}
server_name_in_redirect off;
port_in_redirect off;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
# turn on session caching to drastically improve performance
ssl_session_cache builtin:1000 shared:SSL:10m;
ssl_session_timeout 10m;
# allow configuring ssl session tickets
ssl_session_tickets on;
# slightly reduce the time-to-first-byte
ssl_buffer_size 4k;
# allow configuring custom ssl ciphers
ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE
-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:D
HE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-
SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE
-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-
SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AE
S256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AE
S256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPOR
T:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-D
ES-CBC3-SHA';
ssl_prefer_server_ciphers on;
ssl_ecdh_curve secp384r1;
proxy_ssl_session_reuse on;
upstream upstream-default-backend {
# Load balance algorithm; empty for round robin, which is the default
least_conn;
server 100.96.1.49:8080 max_fails=0 fail_timeout=0;
}
upstream default-site1-80 {
# Load balance algorithm; empty for round robin, which is the default
least_conn;
server 127.0.0.1:8181 max_fails=0 fail_timeout=0;
}
upstream default-site2blog-80 {
# Load balance algorithm; empty for round robin, which is the default
least_conn;
server 100.96.2.127:80 max_fails=0 fail_timeout=0;
server 100.96.1.52:80 max_fails=0 fail_timeout=0;
}
server {
server_name _;
listen 80 proxy_protocol default_server reuseport backlog=511;
listen [::]:80 proxy_protocol default_server reuseport backlog=511;
set $proxy_upstream_name "-";
listen 442 proxy_protocol default_server reuseport backlog=511 ssl http2;
listen [::]:442 proxy_protocol default_server reuseport backlog=511 ssl http2;
# PEM sha: ------
ssl_certificate /ingress-controller/ssl/default-fake-certificate.pem;
ssl_certificate_key /ingress-controller/ssl/default-fake-certificate.pem;
more_set_headers "Strict-Transport-Security: max-age=15724800; includeSubDomains;";
location / {
set $proxy_upstream_name "upstream-default-backend";
port_in_redirect off;
proxy_set_header Host $best_http_Host;
# Pass the extracted client certificate to the backend
# Allow websocket connections
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_set_header X-Real-IP $the_real_ip;
proxy_set_header X-Forwarded-For $the_real_ip;
proxy_set_header X-Forwarded-Host $best_http_Host;
proxy_set_header X-Forwarded-Port $pass_port;
proxy_set_header X-Forwarded-Proto $pass_access_scheme;
proxy_set_header X-Original-URI $request_uri;
proxy_set_header X-Scheme $pass_access_scheme;
# mitigate HTTPoxy Vulnerability
# https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
proxy_set_header Proxy "";
# Custom headers to proxied server
proxy_connect_timeout 10s;
proxy_send_timeout 120s;
proxy_read_timeout 120s;
proxy_redirect off;
proxy_buffering off;
proxy_buffer_size "4k";
proxy_buffers 4 "4k";
proxy_http_version 1.1;
proxy_cookie_domain off;
proxy_cookie_path off;
# In case of errors try the next upstream server before returning an error
proxy_next_upstream error timeout invalid_header http_502 http_503 http_504;
proxy_pass http://upstream-default-backend;
}
# health checks in cloud providers require the use of port 80
location /healthz {
access_log off;
return 200;
}
# this is required to avoid error if nginx is being monitored
# with an external software (like sysdig)
location /nginx_status {
allow 127.0.0.1;
allow ::1;
deny all;
access_log off;
stub_status on;
}
}
server {
server_name blog.site2.com;
listen 80 proxy_protocol;
listen [::]:80 proxy_protocol;
set $proxy_upstream_name "-";
location / {
set $proxy_upstream_name "default-site2blog-80";
port_in_redirect off;
client_max_body_size "20m";
proxy_set_header Host $best_http_Host;
# Pass the extracted client certificate to the backend
# Allow websocket connections
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_set_header X-Real-IP $the_real_ip;
proxy_set_header X-Forwarded-For $the_real_ip;
proxy_set_header X-Forwarded-Host $best_http_Host;
proxy_set_header X-Forwarded-Port $pass_port;
proxy_set_header X-Forwarded-Proto $pass_access_scheme;
proxy_set_header X-Original-URI $request_uri;
proxy_set_header X-Scheme $pass_access_scheme;
# mitigate HTTPoxy Vulnerability
# https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
proxy_set_header Proxy "";
# Custom headers to proxied server
proxy_connect_timeout 10s;
proxy_send_timeout 120s;
proxy_read_timeout 120s;
proxy_redirect off;
proxy_buffering off;
proxy_buffer_size "4k";
proxy_buffers 4 "4k";
proxy_http_version 1.1;
proxy_cookie_domain off;
proxy_cookie_path off;
# In case of errors try the next upstream server before returning an error
proxy_next_upstream error timeout invalid_header http_502 http_503 http_504;
proxy_pass http://default-site2blog-80;
}
}
server {
server_name site1.com;
listen 80 proxy_protocol;
listen [::]:80 proxy_protocol;
set $proxy_upstream_name "-";
listen 442 proxy_protocol ssl http2;
listen [::]:442 proxy_protocol ssl http2;
# PEM sha: ---
ssl_certificate /ingress-controller/ssl/default-site1-tls-secret.pem;
ssl_certificate_key /ingress-controller/ssl/default-site1-tls-secret.pem;
more_set_headers "Strict-Transport-Security: max-age=15724800; includeSubDomains;";
location / {
set $proxy_upstream_name "default-site1-80";
# enforce ssl on server side
if ($pass_access_scheme = http) {
return 301 https://$best_http_Host$request_uri;
}
port_in_redirect off;
client_max_body_size "20m";
proxy_set_header Host $best_http_Host;
# Pass the extracted client certificate to the backend
# Allow websocket connections
proxy_set_header Upgrade $http_upgr
ade;
proxy_set_header Connection $connectio
n_upgrade;
proxy_set_header X-Real-IP $the_real_ip;
proxy_set_header X-Forwarded-For $the_real_ip;
proxy_set_header X-Forwarded-Host $best_http_Host;
proxy_set_header X-Forwarded-Port $pass_port;
proxy_set_header X-Forwarded-Proto $pass_access_scheme;
proxy_set_header X-Original-URI $request_uri;
proxy_set_header X-Scheme $pass_access_scheme;
# mitigate HTTPoxy Vulnerability
# https://www.nginx.com/blog/mitigating-the-httpoxy-vulnerability-with-nginx/
proxy_set_header Proxy "";
# Custom headers to proxied server
proxy_connect_timeout 10s;
proxy_send_timeout 120s;
proxy_read_timeout 120s;
proxy_redirect off;
proxy_buffering off;
proxy_buffer_size "4k";
proxy_buffers 4 "4k";
proxy_http_version 1.1;
proxy_cookie_domain off;
proxy_cookie_path off;
# In case of errors try the next upstream server before returning an error
proxy_next_upstream error timeout invalid_header http_502 http_503 http_504;
proxy_pass http://default-site1-80;
}
}
# default server, used for NGINX healthcheck and access to nginx stats
server {
# Use the port 18080 (random value just to avoid known ports) as default port for nginx.
# Changing this value requires a change in:
# https://github.com/kubernetes/contrib/blob/master/ingress/controllers/nginx/nginx/command.go#L104
listen 18080 default_server reuseport backlog=511;
listen [::]:18080 default_server reuseport backlog=511;
set $proxy_upstream_name "-";
location /healthz {
access_log off;
return 200;
}
location /nginx_status {
set $proxy_upstream_name "internal";
access_log off;
stub_status on;
}
# this location is used to extract nginx metrics
# using prometheus.
# TODO: enable extraction for vts module.
location /internal_nginx_status {
set $proxy_upstream_name "internal";
allow 127.0.0.1;
allow ::1;
deny all;
access_log off;
stub_status on;
}
location / {
set $proxy_upstream_name "upstream-default-backend";
proxy_pass http://upstream-default-backend;
}
}
# default server for services without endpoints
server {
listen 8181;
set $proxy_upstream_name "-";
location / {
return 503;
}
}
}
stream {
log_format log_stream [$time_local] $protocol $status $bytes_sent $bytes_received $session_time;
access_log /var/log/nginx/access.log log_stream;
error_log /var/log/nginx/error.log;
# TCP services
# UDP services
}
これは、不正なサービス名を参照するIngress構成が原因です。サービスへのIngress参照を更新した後、503を取得しなくなりました。
Ingressで503が有効で、アノテーションbasic-authが存在しないシークレットを参照している場合、nginxからnginx.ingress.kubernetes.io/auth-secretエラーが発生する可能性があります。
欠落しているシークレットを追加するか、すべてのbasic-authアノテーションをIngressから削除すると、この状況を解決できます。
通常、入力YAMLファイルでは正しいサービス名（-バックエンド：serviceName :)を書き込まないため、YAMLファイルを書き込むときは注意してください。
お気に入り：
service.yml：
apiVersion: v1
kind: Service
metadata:
name: my-service-name
ingress.yml：
spec:
tls:
- hosts:
- my-domanin-name.com
secretName: ingress-tls
rules:
- Host: my-domanin-name.com
http:
paths:
- backend:
serviceName: MY-SERVICE-NAME
私の場合、それは間違ったservicePort（サービスで定義されたものとは別のポート）を使用したことが原因でした。