peerdiscovery | Pure-Go library for cross-platform local peer discovery using UDP multicast :woman: :repeat: :woman: | Networking library
kandi X-RAY | peerdiscovery Summary
kandi X-RAY | peerdiscovery Summary
Pure-go library for cross-platform thread-safe local peer discovery using UDP multicast. I needed to use peer discovery for croc and everything I tried had problems, so I made another one.
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QUESTION
I am trying to make this example work. It is supposed to create two nodes with mdns support. Mdns is supposed to announce the peer every second, each peer is setup to print a statement once a peer is found.
When running it, the console output is merely empty. It prints out some garbage error in my concern: (node:51841) ExperimentalWarning: Readable[Symbol.asyncIterator] is an experimental feature. This feature could change at any time
How do i enable debugging log so that i can try to understand what is going on under the hood ? I would like to verify the mdns announce packets are issued, and possibly received, or not.
Alternatively, i am trying to use the bootstrap module to begin over wan peers, though expect it to be much slower, thus i would prefer to use mdns.
I tried to add various configuration and modules without much success, it is not clear to me if i am required to use the gossip module if i only want to announce some data on the dht. stuff like that.
any help is appreciated.
...ANSWER
Answered 2020-Oct-18 at 10:57- Logging
To enable debugging, configure the DEBUG environment variable. Start with DEBUG=*, it prints log lines like:
QUESTION
Service definition
...ANSWER
Answered 2020-Jul-13 at 14:34Based on the dig output you shared zevrant-oauth2-service-db is resolving to 92.242.140.2 but it looks like the IP address of your K8s service is 10.97.75.171 (ClusterIP) (based on the output you shared too).
If you hit 10.97.75.171 5432 you should be able to access your Postgres database, provided that you don't have any Kubernetes Network Policy and/or firewall blocking access. Make sure you that in your Postgres config you are binding the server to 0.0.0.0 otherwise if it's something like localhost you will only be able to get to it from the pod.
So the question is what is 92.242.140.2? Wny is coredns responding to a query to zevrant-oauth2-service-db with 92.242.140.2? Is there a DNS forwarder configured in coredns? Is there a default domain configured that is not part of svc.cluster.local?
QUESTION
We have a small private k8s cluster and until this morning everything was working but as of this morning just kubectl is working and no traffic is going through.
I mean I can launch new deployments, kill them, etc and I can see that they are up and running
But when I want to access them via http, amqp, etc I can't.
I was looking at our nginx logs and tried to go to the homepage but there was no log in nginx and nothing loaded in browser which means that no traffic received by nginx.
We are using Weave net as our CNI.
I checked the dns logs and also tested it and dns is working. I don't know where to start looking for solving this problem, any suggestion?
UpdateAfter some hours the problem almost solved and now I can access my applications but I want to ask another question which is very related to this:
Is there a way that we can detect that the problem is because of networking or it is from the cluster networking (the internal k8s network)? I am asking this because in the past I had a problem with k8s dns and this time I thought something is wrong with the k8s CNI.
Update 2Now I see this error in weave:
...ANSWER
Answered 2019-Oct-07 at 13:38I couldn't find a solution for this problem and I had to tear down the cluster and recreate it but this time I used Calico and after running for a week there was no problem.
The only thing I think could cause the problem was the 200Mb memory limit of the Weave and the fact that 4 out of 5 of my Weave pods were hitting that limit and also on their github I found that Weave has an issue with memleak and because of these I decided to change the CNI.
QUESTION
I have 3 node Kubernetes cluster on 1.11 deployed with kubeadm and weave(CNI) running of version 2.5.1. I am providing weave CIDR of IP range of 128 IP's. After two reboot of nodes some of the pods stuck in containerCreating state.
Once you run kubectl describe pod you will see following errors:
ANSWER
Answered 2019-Jul-31 at 12:54Not sure if we have the same problem.
But before i reboot a node. I need to drain it first. So, all pods in that nodes will be evicted. We are safe to reboot the node.
After that node is up. You need to uncordon again. The node will be available to scheduling pod again.
My reference https://kubernetes.io/docs/tasks/administer-cluster/safely-drain-node/
QUESTION
there are three servers and all of them have deployed ehcache. one server is shutdown for some reasons normal or abnormal, when i restart it, i found that cache become empty and data have lose.when i check the other two servers, their cache also become empty and data lose too. i ask this question on ehcach.org/community/ but no reply. i searched answer in ehcache.org(http://www.ehcache.org/documentation/EhcacheUserGuide-1.6.pdf) for days, but i still dont know why. i just found following words, but it doesn't tell me how to do so i still can't avoid above situation.
When a peer comes up, it will be incoherent with other caches. When the bootstrap completes it will be partially coherent. Bootstrap gets the list of keys from a random peer, and then loads those in batches from random peers. If bootstrap fails then the Cache will not start (not like this right now). However if a distributed cache operation occurs which is then overwritten by bootstrap there is a chance that the cache could be inconsistent.
below is my ehcache.xml
...ANSWER
Answered 2017-May-08 at 13:07You basically have 2 issues - firstly, other running caches becoming empty when a non-coherent cache starts up and secondly freshly started non-coherent cache doesn't sync automatically with other running caches. Let me try to address it one by one.
Other running caches becoming empty when a non-coherent cache starts upEhcache has couple of properties which define how the sync'ing between caches will happen, those properties defines whether cache should replicate to other caches by copying or by invalidation. Refer this. So, basically you need to configure Ehcache to "replicate by copy" and not "replicate by invalidation". Once you have taken care of this, your first issue will be resolved.
For your handy reference I am putting the values you should use (I am using same configuration in my application):
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