rke | Rancher Kubernetes Engine | Continuous Deployment library
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kandi X-RAY | rke Summary
Rancher Kubernetes Engine, an extremely simple, lightning fast Kubernetes installer that works everywhere.
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QUESTION
I need help understanding in detail how an ingress controller, specifically the ingress-nginx ingress controller, is supposed to work. To me, it appears as a black box that is supposed to listen on a public IP, terminate TLS, and forward traffic to a pod. But exactly how that happens is a mystery to me.
The primary goal here is understanding, the secondary goal is troubleshooting an immediate issue I'm facing.
I have a cluster with five nodes, and am trying to get the Jupyterhub application to run on it. For the most part, it is working fine. I'm using a pretty standard Rancher RKE setup with flannel/calico for the networking. The nodes run RedHat 7.9 with iptables and firewalld, and docker 19.03.
The Jupyterhub proxy is set up with a ClusterIP service (I also tried a NodePort service, that also works). I also set up an ingress. The ingress sometimes works, but oftentimes does not respond (connection times out). Specifically, if I delete the ingress, and then redeploy my helm chart, the ingress will start working. Also, if I restart one of my nodes, the ingress will start working again. I have not identified the circumstances when the ingress stops working.
Here are my relevant services:
...ANSWER
Answered 2022-Mar-13 at 06:38I found the answer to my question here: https://www.stackrox.io/blog/kubernetes-networking-demystified/ There probably is a caveat that this may vary to some extent depending on which networking CNI you are using, although everything I saw was strictly related to Kubernetes itself.
I'm still trying to digest the content of this blog, and I highly recommend referring directly to that blog, instead of relying on my answer, which could be a poor retelling of the story.
Here is approximately how a package that arrives on port 443 flows.
You will need to use the command to see the tables.
QUESTION
Very new to Terraform so give all the simple advice you got.
I want to setup a RKE-Cluster using/getting the Digital Ocean's newly created droplet IP address. I've setup a local_file to create a txt file in the RKE module (a real weird way to do it but not sure what else I can do.) When I try to terraform plan it I get
...ANSWER
Answered 2021-Oct-21 at 18:01Your RKE module has different capitalization than the "rke" directory in the path. Do you think that might have something to do with it?
QUESTION
I am trying to install my rancher(RKE) kubernetes cluster bitnami/mongodb-shared . But I couldn't create a valid PV for this helm chart.
The error that I am getting: no persistent volumes available for this claim and no storage class is set
This is the helm chart documentation section about PersistenceVolume: https://github.com/bitnami/charts/tree/master/bitnami/mongodb-sharded/#persistence
This is the StorageClass and PersistentVolume yamls that I created for this helm chart PVCs':
...ANSWER
Answered 2021-Jun-07 at 15:00The chart exposes two parameters that allow you to choose the StorageClass you want to use for your PVC(s) (otherwise it will use the 'default' one):
configsvr.persistence.storageClass
shardsvr.persistence.storageClass
Find more information in the Parameters section of the README.md
So basically you need to install the chart setting these parameters accordingly.
QUESTION
As I understand that Kubernetes is a set of binaries that can form a new k8s cluster. There is an open-source kubernetes on git hub but there still some confusion:
- Who is the core team maintain (have write permission) to kubernetes repo? "The Linux Foundation" or CNCF?
- I see that there a multi Kubernetes engines (RKE, EKS..). Do they just add some add-ons/plugin/tools or they modify the source code of kubernetes to build another version of k8s components (apiserver, kube-proxy, kubelet)?
- If I use RKE binary to setup my cluster and it shows Kubernetes version "v1.17.2" that means the version is release of kubernetes repo or it just another fork repo of rancher team. The question is the same to GKE, EKS...
ANSWER
Answered 2021-Feb-19 at 06:39Who is the core team maintain (have write permission) to kubernetes repo? "The Linux Foundation" or CNCF?
Cloud Native Computing Foundation (CNCF) is one of the projects hosted by the Linux Foundation. Kubernetes is one of the project graduated from CNCF. Read more over here.
I see that there a multi Kubernetes engines (RKE, EKS..). Do they just add some add-ons/plugin/tools or they modify the source code of kubernetes to build another version of k8s components (apiserver, kube-proxy, kubelet)?
They are really not "multi kubernetes engines", these are just Kubernetes offering from different vendors. Another such example is GKE (Google Kubernetes Engine) by Google. Main advantage you get from GKE/EKS v/s Kubernetes is that GKE/EKS etc. are managed products, so the vendor providing the same will be responsible for cluster management, availibility of Master and Worker nodes etc.
If I use RKE binary to setup my cluster and it shows Kubernetes version "v1.17.2" that means the version is release of kubernetes repo or it just another fork repo of rancher team. The question is the same to GKE, EKS..
At the core you still have got Kubernetes but once you are using managed products like GKE or EKS, better not to mix them with "Kubernetes" and start thinking of them as GKE or EKS etc. They all can have their own Release cycles + many different other Cloud Computing products of the same vendor are integrated with it. Read more over here.
QUESTION
/opt/kubernetes/bin/rke up --config /home/msh/rancher-cluster.yml
the rancher-cluser.yml file contains:
...ANSWER
Answered 2021-Feb-01 at 10:25From my understanding the interface configuration has to preexist. RKE will not take care of interface configurations.
Therefore either setup an internal subnet and assign your interfaces to it or use the external address also for the internal communication.
QUESTION
I have a CSV file with Id key
and Long desc
. The Id key
is just a string but the Long desc
is HTML code.
My goal is to parse the CSV file into JSON. (See Output)
The thing is that I cant split it on "
because there are some attributes like color: ""red""
and some of the text include "
for example Charger "15W"
. My other idea was to split ;
that is behind the Id key
example KE4I2-21;
but again there are some HTML lines that include ;
like:
I'm using node.js and I tried to use some CSV to JSON packages converters but they didn't manage to parse this data.
Any idea how I can manage to convert this odd CSV file to JSON?
(I know that my Output example isn't correct because I'm opening and closing "
)
I started by replacing all ""
with '
like this: .replace(/""/g, "'")
CSV file (desc.csv)
...ANSWER
Answered 2020-Nov-30 at 18:24So I found a "dirty" way to parse the CSV file into a valid JSON array of objects.
QUESTION
I have an Angular app deployed to kubernetes with the kubernetes ingress controller. There is one setup with a single-node cluster and one with a multi-node cluster. The MIME-Type problem occurs with both setups but the single-node can resolve it very quick while on the multi-node the latency is not acceptable.
On the multi-node cluster the Time To First Byte takes about 5 sec for:
- initial call to example.com
- runtime-es2015.js
- polyfills-es2015.js
- appConfig.json (custom config file)
- favicon.ico
- various png/svg files
What works within a normal timeframe are:
- main-es2015.js
- scripts.js
- styles.css
- ng-validate.js
My cluster setup is as following:
- 2 Control-Plane nodes
- 2 Worker nodes
- Cluster networking with canal
- The cluster was setup with RKE (if that matters)
The index.html
in the Angular app contains:
ANSWER
Answered 2020-Oct-11 at 13:45DNS responses are typically cached so in case you do two requests in row and second still has same Time to first Byte
you can scratch out DNS latency. You can verify DNS latency by Wireshark.
Different namespace hardly makes any difference.
You didn't say any details about cloud provider but I assume there is load balancer (possibly offloading SSL decryption) balancing requests between 2 worker node (where ingress listens). You can enable some sort of logging for sure so do that.
Your nginx ingress is keeping access logs too so you can check them kubectl logs -n nginx-ingress
- you'll have to run this on each of your worker node (or each node where ingress pods are located). Inside of these logs you'll find how long it took to nginx to receive response from your Angular App pod.
With combination of Wireshark, load balancer logs, nginx ingress logs and Angular logs (maybe you need to increase logging level for these to see every HTTP request) you should be able to pinpoint where the problem is.
QUESTION
I read carefully the Kubernetes Documentation here about extending the default 15% of imagefs.available
and the others parameters but it doesn't say how to set it, i have installed the RKE (Rancher Kubernetes Engine) with the following configs.
ANSWER
Answered 2020-Sep-04 at 00:23The kubelet has the following default hard eviction threshold: memory.available<100Mi nodefs.available<10% nodefs.inodesFree<5% imagefs.available<15%
As per official Rancher page:
You can add additional arguments/binds/environment variables via the Config File option in Cluster Options. For more information, see the Extra Args, Extra Binds, and Extra Environment Variables in the RKE documentation or browse the Example Cluster.ymls.
Look in the full example how you can configure kubelet options:
QUESTION
I am running a one-node Kubernetes cluster in a VM for development and testing purposes. I used Rancher Kubernetes Engine (RKE, Kubernetes version 1.18) to deploy it and MetalLB to enable the LoadBalancer service type. Traefik is version 2.2, deployed via the official Helm chart (https://github.com/containous/traefik-helm-chart). I have a few dummy containers deployed to test the setup (https://hub.docker.com/r/errm/cheese).
I can access the Traefik dashboard just fine through the nodes IP (-> MetalLB seems to work). It registers the services and routes for the test containers. Everything is looking fine but when I try to access the test containers in my browser I get a 502 Bad Gateway error.
Some probing showed that there seems to be an issue with outbound traffic from the pods. When I SSH into the node I can reach all pods by their service or pod IP. DNS from node to pod works as well. However, if I start an interactive busybox pod I can't reach any other pod or host from there. When I wget
to any other container (all in the default namespace) I only get wget: can't connect to remote host (10.42.0.7): No route to host.
The same is true for servers on the internet.
I have not installed any network policies and there are none installed by default that I am aware of.
I have also gone through this: https://kubernetes.io/docs/tasks/debug-application-cluster/debug-service
Everything in the guide is working fine, except that the pods don't seem to have any network connectivity whatsoever.
My RKE config is standard, except that I turned off the standard Nginx ingress and enabled etcd encryption-at-rest.
Any ideas?
...ANSWER
Answered 2020-Sep-15 at 09:06Maybe just double check that your node's ip forwarding is turned on: sysctl net.ipv4.ip_forward
If for some reason it doesn't return:
net.ipv4.ip_forward = 1
Then you can set it with:
sudo sysctl -w net.ipv4.ip_forward=1
And to make it permanent:
- edit
/etc/sysctl.conf
- add or uncomment
net.ipv4.ip_forward = 1
- and reload via
sysctl -p /etc/sysctl.conf
QUESTION
Running Rancher v 2.4.5 with a cluster which has 2 nodes. I have tried to install Wordpress using Helm Chart from Bitnami.
All it went well, I'm able to access site via the ingress, except that L4 Balancer created by the chart is still in pending status for some reason.
...ANSWER
Answered 2020-Sep-15 at 14:23I got this resolved by clearing firewall, restarting docker (so it gets new firewall) and then installing metallb (or whatever you have as the loadbalancer). If you do not have a L2 loadbalancer yet, this step can be skipped since in my case the issue was caused by the firewall of the loadbalancer not being registered.
The loadbalancer needs to get an IP from either metallb, your cloudprovider, cloudflare or anything like that. It is external, this means that kubernetes itself is not going to provide it.
You need to use a L2 loadbalancer that provides IPs If you don't have one you can try https://metallb.universe.tf
You could also just leave it, you will never get an external IP but nginx/traefik will still route the traffic since it finds no other route..
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