使用DaemonSet+Taint/Tolerations+NodeSelector部署Nginx Ingress Controller
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- 在Kuberntes Cluster中准备N个节点，我们称之为代理节点。在这N个节点上只部署nginx Ingress Controller（简称NIC）实例，不会跑其他业务容器。
给代理节点打上NoExecute Taint，防止业务容器调度或运行在这些节点。
# 给代理节点打上NoExecute Taint $kubectl taint nodes 192.168.56.105 LB=NIC:NoExecute给代理节点打上Label，让NIC只部署在打了对应Lable的节点上。
# 给代理节点打上对应Label $kubectl label nodes 192.168.56.105 LB=NIC定义DaemonSet Yaml文件，注意加上Tolerations和Node Selector。
apiVersion: extensions/v1beta1 kind: DaemonSet metadata: name: nginx-ingress-lb labels: name: nginx-ingress-lb namespace: kube-system spec: template: metadata: labels: name: nginx-ingress-lb annotations: prometheus.io/port: '10254' prometheus.io/scrape: 'true' spec: terminationGracePeriodSeconds: 60 # 加上对应的Node Selector nodeSelector: LB: NIC # 加上对应的Tolerations tolerations: - key: "LB" operator: "Equal" value: "NIC" effect: "NoSchedule" containers: - image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.11 name: nginx-ingress-lb readinessProbe: httpGet: path: /healthz port: 10254 scheme: HTTP livenessProbe: httpGet: path: /healthz port: 10254 scheme: HTTP initialDelaySeconds: 20 timeoutSeconds: 5 ports: - containerPort: 80 hostPort: 80 - containerPort: 443 hostPort: 443 env: - name: POD_NAME valueFrom: fieldRef: fieldPath: metadata.name - name: POD_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace args: - /nginx-ingress-controller - --default-backend-service=$(POD_NAMESPACE)/default-http-backend - --apiserver-host=http://192.168.56.119:8090 # 这个参数很重要，否则NIC会通过kubernetes discovery去找apiserver，导致连接不上apiserver，NIC会一直重启。创建default backend服务, 服务404.
准备default-backend.yaml。
apiVersion: extensions/v1beta1 kind: Deployment metadata: name: default-http-backend labels: k8s-app: default-http-backend namespace: kube-system spec: replicas: 1 template: metadata: labels: k8s-app: default-http-backend spec: terminationGracePeriodSeconds: 60 containers: - name: default-http-backend # Any image is permissable as long as: # 1. It serves a 404 page at / # 2. It serves 200 on a /healthz endpoint image: gcr.io/google_containers/defaultbackend:1.0 livenessProbe: httpGet: path: /healthz port: 8080 scheme: HTTP initialDelaySeconds: 30 timeoutSeconds: 5 ports: - containerPort: 8080 resources: limits: cpu: 10m memory: 20Mi requests: cpu: 10m memory: 20Mi --- apiVersion: v1 kind: Service metadata: name: default-http-backend namespace: kube-system labels: k8s-app: default-http-backend spec: ports: - port: 80 targetPort: 8080 selector: k8s-app: default-http-backend根据default-backend.yaml创建对应的Deployment和Service。
$ kubectl create -f examples/deployment/nginx/default-backend.yaml根据DaemonSet Yaml创建NIC DaemonSet，启动NIC。
$ kubectl apply -f nginx-ingress-daemonset.yaml确认NIC启动成功后，创建测试用的服务。
$ kubectl run echoheaders --image=gcr.io/google_containers/echoserver:1.8 --replicas=1 --port=8080 $ kubectl expose deployment echoheaders --port=80 --target-port=8080 --name=echoheaders-x $ kubectl expose deployment echoheaders --port=80 --target-port=8080 --name=echoheaders-y创建测试用的Ingress Object。
定义一下文件：ingress.yaml。
apiVersion: extensions/v1beta1 kind: Ingress metadata: name: echomap namespace: default spec: rules: - host: foo.bar.com http: paths: - backend: serviceName: echoheaders-x servicePort: 80 path: /foo - host: bar.baz.com http: paths: - backend: serviceName: echoheaders-y servicePort: 80 path: /bar - backend: serviceName: echoheaders-x servicePort: 80 path: /foo根据ingress.yaml创建对应的Ingress。
$ kubectl apply -f ingress.yaml查看ingress的代理地址
[root@master01 nginx]# kubectl describe ing echomap Name: echomap Namespace: default Address: 192.168.56.105 #代理地址 Default backend: default-http-backend:80 (172.17.0.6:8080) Rules: Host Path Backends ---- ---- -------- foo.bar.com /foo echoheaders-x:80 (<none>) bar.baz.com /bar echoheaders-y:80 (<none>) /foo echoheaders-x:80 (<none>) Annotations: Events: FirstSeen LastSeen Count From SubObjectPath Type Reason Message --------- -------- ----- ---- ------------- -------- ------ ------- 51m 51m 1 ingress-controller Normal CREATE Ingress default/echomap 50m 50m 1 ingress-controller Normal UPDATE Ingress default/echomap测试
[root@master03 k8s.io]# curl 192.168.56.105/foo -H 'Host: foo.bar.com' Hostname: echoheaders-301308589-9l53v Pod Information: -no pod information available- Server values: server_version=nginx: 1.13.3 - lua: 10008 Request Information: client_address=172.17.0.8 method=GET real path=/foo query= request_version=1.1 request_uri=http://foo.bar.com:8080/foo Request Headers: accept=*/* connection=close host=foo.bar.com user-agent=curl/7.29.0 x-forwarded-for=192.168.56.103 x-forwarded-host=foo.bar.com x-forwarded-port=80 x-forwarded-proto=http x-original-uri=/foo x-real-ip=192.168.56.103 x-scheme=http Request Body: -no body in request- [root@master03 k8s.io]# [root@master03 k8s.io]# curl 192.168.56.105/bar -H 'Host: bar.baz.com' Hostname: echoheaders-301308589-9l53v Pod Information: -no pod information available- Server values: server_version=nginx: 1.13.3 - lua: 10008 Request Information: client_address=172.17.0.8 method=GET real path=/bar query= request_version=1.1 request_uri=http://bar.baz.com:8080/bar Request Headers: accept=*/* connection=close host=bar.baz.com user-agent=curl/7.29.0 x-forwarded-for=192.168.56.103 x-forwarded-host=bar.baz.com x-forwarded-port=80 x-forwarded-proto=http x-original-uri=/bar x-real-ip=192.168.56.103 x-scheme=http Request Body: -no body in request-附录：查看nginx.conf
[root@node01 ~]# docker exec -ti 773c5595b0b8 /bin/bash root@nginx-ingress-lb-fbgv7:/etc/nginx# cat /etc/nginx/nginx.conf daemon off; worker_processes 2; pid /run/nginx.pid; worker_rlimit_nofile 523264; events multi_accept on; worker_connections 16384; use epoll; http set_real_ip_from 0.0.0.0/0; real_ip_header X-Forwarded-For; 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 32; 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-javascript application/json application/rss+xml application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/svg+xml image/x-icon text/css text/plain text/x-component; 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_response_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 192.168.56.201 valid=30s; # Retain the default nginx handling of requests without a "Connection" header 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; '' $remote_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:DHE-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-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-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 172.17.0.6:8080 max_fails=0 fail_timeout=0; upstream default-echoheaders-x-80 # Load balance algorithm; empty for round robin, which is the default least_conn; server 172.17.0.14:8080 max_fails=0 fail_timeout=0; upstream default-echoheaders-y-80 # Load balance algorithm; empty for round robin, which is the default least_conn; server 172.17.0.14:8080 max_fails=0 fail_timeout=0; server server_name _; listen 80 default_server reuseport backlog=511; listen [::]:80 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: 3b2b1e879257b99da971c8e21d428383941a7984 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; client_max_body_size "1m"; 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 5s; proxy_send_timeout 60s; proxy_read_timeout 60s; 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 bar.baz.com; listen 80; listen [::]:80; set $proxy_upstream_name "-"; location /foo set $proxy_upstream_name "default-echoheaders-x-80"; port_in_redirect off; client_max_body_size "1m"; 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 5s; proxy_send_timeout 60s; proxy_read_timeout 60s; 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-echoheaders-x-80; location /bar set $proxy_upstream_name "default-echoheaders-y-80"; port_in_redirect off; client_max_body_size "1m"; 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 5s; proxy_send_timeout 60s; proxy_read_timeout 60s; 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-echoheaders-y-80; location / set $proxy_upstream_name "upstream-default-backend"; port_in_redirect off; client_max_body_size "1m"; 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 5s; proxy_send_timeout 60s; proxy_read_timeout 60s; 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; server server_name foo.bar.com; listen 80; listen [::]:80; set $proxy_upstream_name "-"; location /foo set $proxy_upstream_name "default-echoheaders-x-80"; port_in_redirect off; client_max_body_size "1m"; 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 5s; proxy_send_timeout 60s; proxy_read_timeout 60s; 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-echoheaders-x-80; location / set $proxy_upstream_name "upstream-default-backend"; port_in_redirect off; client_max_body_size "1m"; 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 5s; proxy_send_timeout 60s; proxy_read_timeout 60s; 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; # 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
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