using sourceLabel in istio is not working - istio

I am trying to filter access to external ressources. I have created a service entry
apiVersion: networking.istio.io/v1alpha3
kind: ServiceEntry
metadata:
name: bbc-ext
spec:
hosts:
- "www.bbc.co.uk"
ports:
- number: 443
name: https
protocol: HTTPS
I am using sourceLabel to filter the source app allowed to access external ressources.
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: bbc-ext
spec:
hosts:
- "www.bbc.co.uk"
http:
- match:
- sourceLabels:
envir: "production"
route:
- destination:
host: "www.bbc.co.uk"
weight: 100
- route:
- destination:
host: "www.bbc.co.uk"
fault:
abort:
percent: 100
httpStatus: 400
My pod is labeled envir=development but is still allowed access to the ressource.
kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
sleep-d7bfccf65-ws6t6 2/2 Running 0 16m app=sleep,envir=development,pod-template-hash=836977921
But, when I log in the container and run a curl request it is still valid. What am I doing wrong here?
kubectl exec -it sleep-d7bfccf65-ws6t6 -c sleep bash
root#sleep-d7bfccf65-ws6t6:/# curl -v -sL https://www.bbc.co.uk -w "%{http_code}\n" -o /dev/null
[...]
< Cache-Control: private, max-age=0, must-revalidate
< Vary: Accept-Encoding, X-CDN, X-BBC-Edge-Scheme
<
{ [data not shown]
* Connection #0 to host www.bbc.co.uk left intact
200
still the same.
also noticed that sync is not working for routes.
istioctl proxy-status
PROXY CDS LDS EDS RDS PILOT
istio-egressgateway-6cb5b78857-cvqfz.istio-system SYNCED SYNCED SYNCED (100%) NOT SENT istio-pilot-56f6487cdb-qlhzr
istio-ingressgateway-5766b9cc69-64bgd.istio-system SYNCED SYNCED SYNCED (100%) NOT SENT istio-pilot-56f6487cdb-qlhzr
sleep-86f6b99f94-n8l8r.production SYNCED SYNCED SYNCED (100%) SYNCED istio-pilot-56f6487cdb-qlhzr
sleep-d7bfccf65-qbs7v.development SYNCED SYNCED SYNCED (100%) SYNCED istio-pilot-56f6487cdb-qlhzr

Related

Redis deployed in AWS - Connection time out from localhost SpringBoot app

Small question regarding Redis deployed in AWS (not AWS Elastic Cache) and an issue connecting to it.
Here is the setup of the Redis deployed in AWS: (pasting only the Kubernetes StatefulSet and Service)
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: redis
spec:
serviceName: redis
replicas: 3
selector:
matchLabels:
app: redis
template:
metadata:
labels:
app: redis
spec:
initContainers:
- name: config
image: redis:7.0.5-alpine
command: [ "sh", "-c" ]
args:
- |
cp /tmp/redis/redis.conf /etc/redis/redis.conf
echo "finding master..."
MASTER_FDQN=`hostname -f | sed -e 's/redis-[0-9]\./redis-0./'`
if [ "$(redis-cli -h sentinel -p 5000 ping)" != "PONG" ]; then
echo "master not found, defaulting to redis-0"
if [ "$(hostname)" = "redis-0" ]; then
echo "this is redis-0, not updating config..."
else
echo "updating redis.conf..."
echo "slaveof $MASTER_FDQN 6379" >> /etc/redis/redis.conf
fi
else
echo "sentinel found, finding master"
MASTER="$(redis-cli -h sentinel -p 5000 sentinel get-master-addr-by-name mymaster | grep -E '(^redis-\d{1,})|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})')"
echo "master found : $MASTER, updating redis.conf"
echo "slaveof $MASTER 6379" >> /etc/redis/redis.conf
fi
volumeMounts:
- name: redis-config
mountPath: /etc/redis/
- name: config
mountPath: /tmp/redis/
containers:
- name: redis
image: redis:7.0.5-alpine
command: ["redis-server"]
args: ["/etc/redis/redis.conf"]
ports:
- containerPort: 6379
name: redis
volumeMounts:
- name: data
mountPath: /data
- name: redis-config
mountPath: /etc/redis/
volumes:
- name: redis-config
emptyDir: {}
- name: config
configMap:
name: redis-config
volumeClaimTemplates:
- metadata:
name: data
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: nfs-1
resources:
requests:
storage: 50Mi
---
apiVersion: v1
kind: Service
metadata:
name: redis
spec:
ports:
- port: 6379
targetPort: 6379
name: redis
selector:
app: redis
type: LoadBalancer
The pods are healthy, I can exec into it and perform operations fine. Here is the get all:
NAME READY STATUS RESTARTS AGE
pod/redis-0 1/1 Running 0 22h
pod/redis-1 1/1 Running 0 22h
pod/redis-2 1/1 Running 0 22h
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/redis LoadBalancer 192.168.45.55 10.51.5.2 6379:30315/TCP 26h
NAME READY AGE
statefulset.apps/redis 3/3 22h
Here is the describe of the service:
Name: redis
Namespace: Namespace
Labels: <none>
Annotations: <none>
Selector: app=redis
Type: LoadBalancer
IP Family Policy: SingleStack
IP Families: IPv4
IP: 192.168.22.33
IPs: 192.168.22.33
LoadBalancer Ingress: 10.51.5.2
Port: redis 6379/TCP
TargetPort: 6379/TCP
NodePort: redis 30315/TCP
Endpoints: 192.xxx:6379,192.xxx:6379,192.xxx:6379
Session Affinity: None
External Traffic Policy: Cluster
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal IPAllocated 68s metallb-controller Assigned IP ["10.51.5.2"]
Normal nodeAssigned 58s (x5 over 66s) metallb-speaker announcing from node "someaddress.com" with protocol "bgp"
Normal nodeAssigned 58s (x5 over 66s) metallb-speaker announcing from node "someaddress.com" with protocol "bgp"
I then try to connect to it, i.e. inserting some data with a very straightforward Spring Boot application. The application has no business logic, just trying to insert data.
Here are the relevant parts:
#Configuration
public class RedisConfiguration {
#Bean
public ReactiveRedisConnectionFactory reactiveRedisConnectionFactory() {
return new LettuceConnectionFactory("10.51.5.2", 30315);
}
#Repository
public class RedisRepository {
private final ReactiveRedisOperations<String, String> reactiveRedisOperations;
public RedisRepository(ReactiveRedisOperations<String, String> reactiveRedisOperations) {
this.reactiveRedisOperations = reactiveRedisOperations;
}
public Mono<RedisPojo> save(RedisPojo redisPojo) {
return reactiveRedisOperations.opsForValue().set(redisPojo.getInput(), redisPojo.getOutput()).map(__ -> redisPojo);
}
Each time I am trying to write the data, I am getting this exception:
2022-12-02T20:20:08.015+08:00 ERROR 1184 --- [ctor-http-nio-3] a.w.r.e.AbstractErrorWebExceptionHandler : [8f16a752-1] 500 Server Error for HTTP POST "/save"
org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis
at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactory.java:1602) ~[spring-data-redis-3.0.0.jar:3.0.0]
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
*__checkpoint ⇢ Handler com.redis.controller.RedisController#test(RedisRequest) [DispatcherHandler]
*__checkpoint ⇢ HTTP POST "/save" [ExceptionHandlingWebHandler]
Original Stack Trace:
at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactory.java:1602) ~[spring-data-redis-3.0.0.jar:3.0.0]
Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to 10.51.5.2/<unresolved>:30315
at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:78) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]
at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]
at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:350) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]
at io.lettuce.core.RedisClient.connect(RedisClient.java:216) ~[lettuce-core-6.2.1.RELEASE.jar:6.2.1.RELEASE]
Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: /10.51.5.2:30315
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:261) ~[netty-transport-4.1.85.Final.jar:4.1.85.Final]
at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98) ~[netty-common-4.1.85.Final.jar:4.1.85.Final]
This is particularly puzzling, because I am quite sure the code of the Spring Boot app is working. When I change the IP of return new LettuceConnectionFactory("10.51.5.2", 30315);: to
a regular Redis on my laptop ("localhost", 6379),
a dockerized Redis on my laptop,
a dockerized Redis on prem, all are working fine.
Therefore, I am quite puzzled what did I do wrong with the setup of this Redis in AWS.
What should I do in order to connect to it properly.
May I get some help please?
Thank you
By default, Redis binds itself to the IP addresses 127.0.0.1 and ::1 and does not accept connections against non-local interfaces. Chances are high that this is your main issue and you may want to review your redis.conf file to bind Redis to the interface you need or to the generic * -::*, as explained in the comments of the config file itself (which I have linked above).
With that being said, Redis also does not accept connections on non-local interfaces if the default user has no password - a security layer named Protected mode. Thus you should either give your default user a password or disable protected mode in your redis.conf file.
Not sure if this applies to your case but, as a side note, I would suggest to always avoid exposing Redis to the Internet.
You are mixing 2 things.
To enable this service for pods in different namespaces you do not need external load balancer, you can just try to use redis.namespace-name:6379 dns name and it will just work. Such dns is there for every service you create (but works only inside kubernetes)
Kubernetes will make sure that your traffic will be routed to proper pods (assuming there is more than one).
If you want to expose redis from outside of kubernetes then you need to make sure there is connectivity from the outside and then you need network load balancer that will forward traffic to your kubernetes service (in your case node port, so you need NLB with eks worker nodes: 30315 as a targets)
If your worker nodes have public IP and their SecurityGroups allow connecting to them directly, you could try to connect to worker node's IP directly just to test things out (without LB).
And regardless off yout setup you can always create proxy via kubectl
kubectl port-forward -n redisNS svc/redis 6379:6379
and connect from spring boot app to localhost:6379
How do you want to connect from app to redis in a final setup?

NGINX Ingress times out with large file downloads

We are running a Spring Boot app in a k8s pod that is hosted behind an NGINX ingress with a EC2 load balancer. Our app occasionally needs to send a very large file (10/20 GB). We have observed that this operation occasionally times out when querying through the ingress, but does not timeout when queried directly. To more easily reproduce this, we created a simple endpoint to request a file of arbitrary size (/files/SIZE). That is what you can see below.
When a request times out, the ingress controller does not seem to post any logs. From the HTTP client, when the request times out, here is what we are given:
{ [3744 bytes data]
100 16.4G 0 16.4G 0 0 22.7M 0 --:--:-- 0:12:23 --:--:-- 23.9M* TLSv1.2 (IN), TLS alert, close notify (256):
{ [2 bytes data]
100 16.5G 0 16.5G 0 0 22.7M 0 --:--:-- 0:12:23 --:--:-- 23.6M
* Connection #0 to host INGRESS_URL left intact
* Closing connection 0
curl INGRESS_URL/files/21474836480 -v 31.47s user 26.92s system 7% cpu 12:23.81 total
Here is the configuration of our ingress:
kind: Ingress
apiVersion: extensions/v1beta1
metadata:
name: USER
namespace: NAMESPACE
selfLink: /apis/extensions/v1beta1/namespaces/NAMESPACE/ingresses/USER
uid: d84f3ab2-7f2c-42c1-a44f-c6a7d432f03e
resourceVersion: '658287365'
generation: 1
creationTimestamp: '2021-06-29T13:21:45Z'
labels:
app.kubernetes.io/instance: USER
app.kubernetes.io/managed-by: Helm
app.kubernetes.io/name: APP
helm.sh/chart: CHART
annotations:
kubernetes.io/ingress.class: nginx-l4-ext
meta.helm.sh/release-name: USER
meta.helm.sh/release-namespace: NAMESPACE
nginx.ingress.kubernetes.io/client-max-body-size: '0'
nginx.ingress.kubernetes.io/proxy-body-size: '0'
nginx.ingress.kubernetes.io/proxy-buffering: 'off'
nginx.ingress.kubernetes.io/proxy-max-temp-file-size: '0'
nginx.ingress.kubernetes.io/proxy-read-timeout: '1800'
nginx.ingress.kubernetes.io/proxy-send-timeout: '1800'
nginx.ingress.kubernetes.io/websocket-services: core-service
nginx.org/websocket-services: core-service
managedFields:
- manager: Go-http-client
operation: Update
apiVersion: networking.k8s.io/v1beta1
time: '2021-06-29T13:21:45Z'
fieldsType: FieldsV1
fieldsV1:
'f:metadata':
'f:annotations':
.: {}
'f:kubernetes.io/ingress.class': {}
'f:meta.helm.sh/release-name': {}
'f:meta.helm.sh/release-namespace': {}
'f:nginx.ingress.kubernetes.io/client-max-body-size': {}
'f:nginx.ingress.kubernetes.io/proxy-body-size': {}
'f:nginx.ingress.kubernetes.io/proxy-buffering': {}
'f:nginx.ingress.kubernetes.io/proxy-max-temp-file-size': {}
'f:nginx.ingress.kubernetes.io/proxy-read-timeout': {}
'f:nginx.ingress.kubernetes.io/proxy-send-timeout': {}
'f:nginx.ingress.kubernetes.io/websocket-services': {}
'f:nginx.org/websocket-services': {}
'f:labels':
.: {}
'f:app.kubernetes.io/instance': {}
'f:app.kubernetes.io/managed-by': {}
'f:app.kubernetes.io/name': {}
'f:helm.sh/chart': {}
'f:spec':
'f:rules': {}
- manager: nginx-ingress-controller
operation: Update
apiVersion: networking.k8s.io/v1beta1
time: '2021-06-29T13:21:59Z'
fieldsType: FieldsV1
fieldsV1:
'f:status':
'f:loadBalancer':
'f:ingress': {}
spec:
rules:
- host: HOST_URL.com
http:
paths:
- path: /
pathType: Prefix
backend:
serviceName: SERVICE_NAME
servicePort: 9081
status:
loadBalancer:
ingress:
- hostname: LOAD_BALANCER_URL
We are running ingress-nginx#v0.46.0
If anyone has any suggestions for why our large downloads are timing out, that would be great!
Testing Already Done:
Verified the params are actually appearing in the generated nginx.conf
Tried changing client-body-timeout - this had to effect.
Recreated the whole environment on my local minikube instance. The application works there. Is it possible this is an Amazon ELB issue?
Changing spring.mvc.async.request-timeout does not fix the issue.
The issue only occurs when making HTTPS calls. HTTP calls run totally fine
I had a similar issue with one of my SpringBoot Apps and the issue was with the Springboot configuration in the application.properties file.
spring:
mvc:
async:
request-timeout: 3600000
Reference: https://stackoverflow.com/a/43496244/2777988

Istio: Health check / sidecar fails when I enable the JWT RequestAuthentication

OBSOLETE:
I keep this post for further reference, but you can check better diagnose (not solved yet, but workarounded) in
Istio: RequestAuthentication jwksUri does not resolve internal services names
UPDATE:
In Istio log we see the next error. uaa is a kubernetes pod serving OAUTH authentication/authorization. It is accessed with the name uaa from the normal services. I do not know why the istiod cannot find uaa host name. Have I to use an specific name? (remember, standard services find uaa host perfectly)
2021-03-03T18:39:36.750311Z error model Failed to fetch public key from "http://uaa:8090/uaa/token_keys": Get "http://uaa:8090/uaa/token_keys": dial tcp: lookup uaa on 10.96.0.10:53: no such host
2021-03-03T18:39:36.750364Z error Failed to fetch jwt public key from "http://uaa:8090/uaa/token_keys": Get "http://uaa:8090/uaa/token_keys": dial tcp: lookup uaa on 10.96.0.10:53: no such host
2021-03-03T18:39:36.753394Z info ads LDS: PUSH for node:product-composite-5cbf8498c7-jd4n5.chp18 resources:29 size:134.3kB
2021-03-03T18:39:36.754623Z info ads RDS: PUSH for node:product-composite-5cbf8498c7-jd4n5.chp18 resources:14 size:14.2kB
2021-03-03T18:39:36.790916Z warn ads ADS:LDS: ACK ERROR sidecar~10.1.1.56~product-composite-5cbf8498c7-jd4n5.chp18~chp18.svc.cluster.local-10 Internal:Error adding/updating listener(s) virtualInbound: Provider 'origins-0' in jwt_authn config has invalid local jwks: Jwks RSA [n] or [e] field is missing or has a parse error
2021-03-03T18:39:55.618106Z info ads ADS: "10.1.1.55:41162" sidecar~10.1.1.55~review-65b6886c89-bcv5f.chp18~chp18.svc.cluster.local-6 terminated rpc error: code = Canceled desc = context canceled
Original question
I have a service that is working fine, after injecting istio sidecar to a standard kubernetes pod.
I'm trying to add jwt Authentication, and for this, I'm following the official guide Authorization with JWT
My problem is
If I create the JWT resources (RequestAuthorization and AuthorizationPolicy) AFTER injecting the istio dependencies, everything (seems) to work fine
But if I create the JWT resources (RequestAuthorization and AuthorizationPolicy) and then inject the Istio the pod doesn't start. After checking the logs, seems that the sidecar is not able to work (maybe checking the health?)
My code:
JWT Resources
apiVersion: "security.istio.io/v1beta1"
kind: "RequestAuthentication"
metadata:
name: "ra-product-composite"
spec:
selector:
matchLabels:
app: "product-composite"
jwtRules:
- issuer: "http://uaa:8090/uaa/oauth/token"
jwksUri: "http://uaa:8090/uaa/token_keys"
---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
name: "ap-product-composite"
spec:
selector:
matchLabels:
app: "product-composite"
action: ALLOW
# rules:
# - from:
# - source:
# requestPrincipals: ["http://uaa:8090/uaa/oauth/token/faf5e647-74ab-42cc-acdb-13cc9c573d5d"]
# b99ccf71-50ed-4714-a7fc-e85ebae4a8bb
2- I use destination rules as follows
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
name: dr-product-composite
spec:
host: product-composite
trafficPolicy:
tls:
mode: ISTIO_MUTUAL
3- My service deployment
apiVersion: apps/v1
kind: Deployment
metadata:
name: product-composite
spec:
replicas: 1
selector:
matchLabels:
app: product-composite
template:
metadata:
labels:
app: product-composite
version: latest
spec:
containers:
- name: comp
image: bthinking/product-composite-service
imagePullPolicy: Never
env:
- name: SPRING_PROFILES_ACTIVE
value: "docker"
- name: SPRING_CONFIG_LOCATION
value: file:/config-repo/application.yml,file:/config-repo/product-composite.yml
envFrom:
- secretRef:
name: rabbitmq-client-secrets
ports:
- containerPort: 80
resources:
limits:
memory: 350Mi
livenessProbe:
httpGet:
scheme: HTTP
path: /actuator/info
port: 4004
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 2
failureThreshold: 20
successThreshold: 1
readinessProbe:
httpGet:
scheme: HTTP
path: /actuator/health
port: 4004
initialDelaySeconds: 10
periodSeconds: 10
timeoutSeconds: 2
failureThreshold: 3
successThreshold: 1
volumeMounts:
- name: config-repo-volume
mountPath: /config-repo
volumes:
- name: config-repo-volume
configMap:
name: config-repo-product-composite
---
apiVersion: v1
kind: Service
metadata:
name: product-composite
spec:
selector:
app: "product-composite"
ports:
- port: 80
name: http
targetPort: 80
- port: 4004
name: http-mgm
targetPort: 4004
4- Error log in the pod (combined service and sidecar)
2021-03-02 19:34:41.315 DEBUG 1 --- [undedElastic-12] o.s.s.w.s.a.AuthorizationWebFilter : Authorization successful
2021-03-02 19:34:41.315 DEBUG 1 --- [undedElastic-12] .b.a.e.w.r.WebFluxEndpointHandlerMapping : [0e009bf1-133] Mapped to org.springframework.boot.actuate.endpoint.web.reactive.AbstractWebFluxEndpointHandlerMapping$ReadOperationHandler#e13aa23
2021-03-02 19:34:41.316 DEBUG 1 --- [undedElastic-12] ebSessionServerSecurityContextRepository : No SecurityContext found in WebSession: 'org.springframework.web.server.session.InMemoryWebSessionStore$InMemoryWebSession#48e89a58'
2021-03-02 19:34:41.319 DEBUG 1 --- [undedElastic-15] .s.w.r.r.m.a.ResponseEntityResultHandler : [0e009bf1-133] Using 'application/vnd.spring-boot.actuator.v3+json' given [*/*] and supported [application/vnd.spring-boot.actuator.v3+json, application/vnd.spring-boot.actuator.v2+json, application/json]
2021-03-02 19:34:41.320 DEBUG 1 --- [undedElastic-15] .s.w.r.r.m.a.ResponseEntityResultHandler : [0e009bf1-133] 0..1 [java.util.Collections$UnmodifiableMap<?, ?>]
2021-03-02 19:34:41.321 DEBUG 1 --- [undedElastic-15] o.s.http.codec.json.Jackson2JsonEncoder : [0e009bf1-133] Encoding [{}]
2021-03-02 19:34:41.326 DEBUG 1 --- [or-http-epoll-3] r.n.http.server.HttpServerOperations : [id: 0x0e009bf1, L:/127.0.0.1:4004 - R:/127.0.0.1:57138] Detected non persistent http connection, preparing to close
2021-03-02 19:34:41.327 DEBUG 1 --- [or-http-epoll-3] o.s.w.s.adapter.HttpWebHandlerAdapter : [0e009bf1-133] Completed 200 OK
2021-03-02 19:34:41.327 DEBUG 1 --- [or-http-epoll-3] r.n.http.server.HttpServerOperations : [id: 0x0e009bf1, L:/127.0.0.1:4004 - R:/127.0.0.1:57138] Last HTTP response frame
2021-03-02 19:34:41.328 DEBUG 1 --- [or-http-epoll-3] r.n.http.server.HttpServerOperations : [id: 0x0e009bf1, L:/127.0.0.1:4004 - R:/127.0.0.1:57138] Last HTTP packet was sent, terminating the channel
2021-03-02T19:34:41.871551Z warn Envoy proxy is NOT ready: config not received from Pilot (is Pilot running?): cds updates: 1 successful, 0 rejected; lds updates: 0 successful, 1 rejected
5- Istio injection
kubectl get deployment product-composite -o yaml | istioctl kube-inject -f - | kubectl apply -f -
NOTICE: I have checked a lot of post in SO, and it seems that health checking create a lot of problems with sidecars and other configurations. I have checked the guide Health Checking of Istio Services with no success. Specifically, I tried to disable the sidecar.istio.io/rewriteAppHTTPProbers: "false", but it is worse (in this case, doesn't start neither the sidecar neither the service.

502 Server Error when creating http load balancer in google/GKE

My application consists of play web application deployed using GKE. The application was running fine (using Deployment and Loadbalancer service) and then I decided to use Ingress. I made the following changes which has made the application unreachable. I get 502 error when I try to connect with the application using ingress IP.
The application is of kind Deployment.
apiVersion: apps/v1
kind: Deployment
metadata:
name: webapp
spec:
replicas: 2
selector:
matchLabels:
app: webapp
It has a service associated with it
apiVersion: v1
kind: Service
metadata:
name: webapp-service
spec:
selector:
app: webapp
ports:
- protocol: TCP
port: 9000 #this service is reachable at this port
targetPort: 9000 #this service will forward the request to correspoding nodes of the service at this port
#type: LoadBalancer
type: NodePort
Then I applied the following file to create ingress
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: webapp-https-loadbalancer-ingress
annotations:
kubernetes.io/ingress.class: "gce"
spec:
rules:
- http:
paths:
- path: /*
backend:
serviceName: webapp-service
servicePort: 9000
I can see that there is an IP address (which is also reachable from outside) when I run
kubectl describe ingress webapp-https-loadbalancer-ingress
Name: webapp-https-loadbalancer-ingress
Namespace: default
Address: 3x.yyy.zzz.pq
Default backend: default-http-backend:80 (10.88.0.5:8080)
Rules:
Host Path Backends
---- ---- --------
*
... Type Reason Age From Message
---- ------ ---- ---- -------
Normal ADD 10m loadbalancer-controller default/webapp-https-loadbalancer-ingress
Normal CREATE 9m10s loadbalancer-controller ip: 3x.yyy.zzz.pq
But I am not able to reach the application using https://3x.yyy.zzz.pq. I haven't yet associated the domain with the IP. I tried to connect using curl and got error- 502 bad gateway error
curl -v 3x.xxx.xxx.xxx
* Expire in 0 ms for 6 (transfer 0x55d4c5258f90)
* Trying 3x.xxx.xxx.xxx...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x55d4c5258f90)
* Connected to 3x.xxx.xxx.xxx (3x.xxx.xxx.xxx) port 80 (#0)
> GET / HTTP/1.1
> Host: 3x.xxx.xxx.xxx
> User-Agent: curl/7.64.0
> Accept: */*
>
< HTTP/1.1 502 Bad Gateway
< Content-Type: text/html; charset=UTF-8
< Referrer-Policy: no-referrer
< Content-Length: 332
< Date: Tue, 22 Dec 2020 22:27:23 GMT
<
<html><head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>502 Server Error</title>
</head>
<body text=#000000 bgcolor=#ffffff>
<h1>Error: Server Error</h1>
<h2>The server encountered a temporary error and could not complete your request.<p>Please try again in 30 seconds.</h2>
<h2></h2>
</body></html>
* Connection #0 to host 3x.xxx.xxx.xxx left intact
The issue was that the load balancer's IP was not in the allowed-hosts list in the server. As temporary fix, I used wild card in server configuration to allow traffic from all hosts. I am still figuring out how to restrict it to load balancer's internal IPs

Chain KUBE-SERVICES - Rejects Service has no endpoints

Trying to curl the service deployed in k8s cluster from the master node
curl: (7) Failed to connect to localhost port 31796: Connection
refused
For kubernetes cluster, when I check my iptables on master I get the following .
Chain KUBE-SERVICES (1 references)
target prot opt source destination
REJECT tcp -- anywhere 10.100.94.202 /*
default/some-service: has no endpoints */ tcp dpt:9015 reject-with
icmp-port-unreachable
REJECT tcp -- anywhere 10.103.64.79 /*
default/some-service: has no endpoints */ tcp dpt:9000 reject-with
icmp-port-unreachable
REJECT tcp -- anywhere 10.107.111.252 /*
default/some-service: has no endpoints */ tcp dpt:9015 reject-with
icmp-port-unreachable
if I flush my iptables with
iptables -F
and then curl
curl -v localhost:31796
I get the following
* Rebuilt URL to: localhost:31796/
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 31796 (#0)
> GET / HTTP/1.1
> Host: localhost:31796
> User-Agent: curl/7.58.0
> Accept: */*
but soon after it results in
* Rebuilt URL to: localhost:31796/
* Trying 127.0.0.1...
* TCP_NODELAY set
* connect to 127.0.0.1 port 31796 failed: Connection refused
* Failed to connect to localhost port 31796: Connection refused
* Closing connection 0
curl: (7) Failed to connect to localhost port 31796: Connection
refused
I'm using the nodePort concept in my service
Details
kubectl get node
NAME STATUS ROLES AGE VERSION
ip-Master-IP Ready master 26h v1.12.7
ip-Node1-ip Ready <none> 26h v1.12.7
ip-Node2-ip Ready <none> 23h v1.12.7
Kubectl get pods
NAME READY STATUS RESTARTS AGE
config-service-7dc8fc4ff-5kk88 1/1 Running 0 5h49m
kubectl get svc -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S)
AGE SELECTOR
cadmin-server NodePort 10.109.55.255 <none>
9015:31796/TCP 22h app=config-service
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP
26h <none>
Kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy {"health": "true"}
endpoint.yml
apiVersion: v1
kind: Endpoints
metadata:
name: xyz
subsets:
- addresses:
- ip: node1_ip
- ip: node2_ip
ports:
- port: 31796
- name: xyz
service.yml
apiVersion: v1
kind: Service
metadata:
name: xyz
namespace: default
annotations:
alb.ingress.kubernetes.io/healthcheck-path: /xyz
labels:
app: xyz
spec:
type: NodePort
ports:
- nodePort: 31796
port: 8001
targetPort: 8001
protocol: TCP
selector:
app: xyz
deployment.yml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: xyz
name: xyz
namespace: default
spec:
replicas: 1
selector:
matchLabels:
app: xyz
template:
metadata:
labels:
app: xyz
spec:
containers:
- name: xyz
image: abc
ports:
- containerPort: 8001
imagePullPolicy: Always
resources:
requests:
cpu: 200m
volumeMounts:
- mountPath: /app/
name: config-volume
restartPolicy: Always
imagePullSecrets:
- name: awslogin
volumes:
- configMap:
name: xyz
name: config-volume
You can run the following command to check endpoints.
kubectl get endpoints
If endpoint is not showing up for the service. Please check the yml files that you used for creating the loadbalancer and the deployment. Make sure the labels match.
As many have pointed out in their comments the Firewall Rule "no endpoints" is inserted by the kubelet service and indicates a broken Service Application Definition or Setup.
# iptables-save
# Generated by iptables-save v1.4.21 on Wed Feb 24 10:10:23 2021
*filter
# [...]
-A KUBE-EXTERNAL-SERVICES -p tcp -m comment --comment "default/web-service:http has no endpoints" -m addrtype --dst-type LOCAL -m tcp --dport 30081 -j REJECT --reject-with icmp-port-unreachable
# [...]
As you have noticed as well the service kubelet constantly monitors the Firewall Rules and inserts or deletes rules dynamically according to the Kubernetes Pod or Service definitions.
# kubectl get service --namespace=default
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 198d
web-service NodePort 10.111.188.199 <none> 8201:30081/TCP 194d
# kubectl get pods --namespace=default
No resources found in default namespace.
In this example case a Service is defined but the Pod associated with the Service does not exist.
Still the kube-proxy process listens on the port 30081:
# netstat -lpn | grep -i kube
[...]
tcp 0 0 0.0.0.0:30081 0.0.0.0:* LISTEN 21542/kube-proxy
[...]
So the kubelet service inserts a firewall rule to prevent the traffic for the broken service.
Also the kubelet service will delete this rule as soon as you delete the Service definition
# kubectl delete service web-service --namespace=default
service "web-service" deleted
# iptables-save | grep -i "no endpoints" | wc -l
0
As a Side Node:
This rule is also inserted for Kubernetes Definitions that the kubelet Service doesn't like.
As an example your service can have the name "log-service" but can't have the name "web-log".
In the latter case the kubelet Service didn't give a warning but inserted this blocking rule