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QUESTION
This is a basic question, but i couldn't find the answer to it anywhere.
We have two approaches:
...ANSWER
Answered 2021-Jun-14 at 14:54Easy to see the difference
QUESTION
I originally posted this question as an issue on the GitHub project for the AWS Load Balancer Controller here: https://github.com/kubernetes-sigs/aws-load-balancer-controller/issues/2069.
I'm seeing some odd behavior that I can't trace or explain when trying to get the loadBalacnerDnsName from an ALB created by the controller. I'm using v2.2.0 of the AWS Load Balancer Controller in a CDK project. The ingress that I deploy triggers the provisioning of an ALB, and that ALB can connect to my K8s workloads running in EKS.
Here's my problem: I'm trying to automate the creation of a Route53 A Record that points to the loadBalancerDnsName
of the load balancer, but the loadBalancerDnsName
that I get in my CDK script is not the same as the loadBalancerDnsName
that shows up in the AWS console once my stack has finished deploying. The value in the console is correct and I can get a response from that URL. My CDK script outputs the value of the DnsName as a CfnOutput value, but that URL does not point to anything.
In CDK, I have tried to use KubernetesObjectValue
to get the DNS name from the load balancer. This isn't working (see this related issue: https://github.com/aws/aws-cdk/issues/14933), so I'm trying to lookup the Load Balancer with CDK's .fromLookup
and using a tag that I added through my ingress annotation:
ANSWER
Answered 2021-Jun-13 at 20:23I think that the answer is to use external-dns.
ExternalDNS allows you to control DNS records dynamically via Kubernetes resources in a DNS provider-agnostic way.
QUESTION
Story: in my java code i have a few ScheduledFuture's that i need to run everyday on specific time (15:00 for example), the only available thing that i have is database, my current application and openshift with multiple pods. I can't move this code out of my application and must run it from there.
Problem: ScheduledFuture works on every pod, but i need to run it only once a day. I have a few ideas, but i don't know how to implement them.
Idea #1: Set environment variable to specific pod, then i will be able to check if this variable exists (and its value), read it and run schedule task if required. I know that i have a risk of hovered pods, but that's better not to run scheduled task at all than to run it multiple times.
Idea #2: Determine a leader pod somehow, this seems to be a bad idea in my case since it always have "split-brain" problem.
Idea #3 (a bit offtopic): Create my own synchronization algorithm thru database. To be fair, it's the simplest way to me since i'm a programmer and not SRE. I understand that this is not the best one tho.
Idea #4 (a bit offtopic): Just use quartz schedule library. I personally don't really like that and would prefer one of the first two ideas (if i will able to implement them), but at the moment it seems like my only valid choice.
UPD. May be you have some other suggestions or a warning that i shouldn't ever do that?
...ANSWER
Answered 2021-May-30 at 11:20You can create cron job using openshift https://docs.openshift.com/container-platform/4.7/nodes/jobs/nodes-nodes-jobs.html and have this job trigger some endpoint in you application that will invoke your logic.
QUESTION
i use parrot security as my daily distro. its mate terminal is transparent so is vim .but i wanted to get auto complete and used some plugins.auto complete window appears to be in pink which looks really ugly in semi transparent black background.i changed the theme and it was fixed but so was gone vim transparency .
in short word (1)i have to keep the default (2)i have to keep transparent vim (3)i have to change the auto complete window from pink to semi transparent black
here is my init.vimrc
...ANSWER
Answered 2021-Jun-09 at 19:27If you are using neovim there is an option called :h pumblend
which can be used to change the transparency of the popup menu.
Are you sure gruvbox
caused your vim to lose transparency? I am not sure if vim is able to change a terminal emulator's transparency. I or someone else might be able to advise you better if you post pictures of what has changed.
QUESTION
I am using listagg to group users having same permissions, based on the query from the below stack question, tweaked it a bit for my needs. How do I view grants on Redshift
This fails saying listagg is compute node function and should be used on user created table. Any way to use listagg on catalog tables and has_*_privilege function both of which runs on leader node?
...ANSWER
Answered 2021-Jun-07 at 11:35No.
As you have correctly understood, listagg
is a function implemented by Redshift, rather than being inherited from Postgres/Paraccel, and it has been implemented only on the worker nodes.
The has
function is from Postgres, and is implemented only on the leader-node.
The query planner will not permit a query using a leader-node only function to recruit worker nodes, so you cannot call listagg
.
(BTW, if I remember correctly, that 'v' for reltype is also going to pick up materialized views.)
As an aside, you can in fact obtain the information you are looking for directly from the system tables, but this is a long and complex undertaking. I am a Redshift specialist and it took me two months for the first version, although I was working at the time.
QUESTION
I am preparing for the CCDAK certification and I stepped into this question:
"A topic has three replicas and you set min.insync.replicas to 2. If two out of three replicas are not available, what happens when a consume request is sent to broker?"
The given answer is:
Data will be returned by the remaining in-sync replica
I had a doubt over a corner case: what happens when both the leader and the in-sync replica go down at the same time (third replica still not in-sync) and the consumer wants to read a message not present in the third replica (it may has not been copied yet since it is a not in-sync replica)?
Would a practical example be something like this: let's say consumer has committed offset 10 and wants to read from 11 but third replica has messages up to offset 9. Leader and follower are down, what would happen? Will the consumer just wait for the other brokers or will Kafka throw an error I have to deal with?
...ANSWER
Answered 2021-Jun-07 at 10:30Your consumer will not be rebalanced because from Kafka side, It can not select a leader for that partition. The partition is not Synced and then Kafka will wait to start of other replicas to select a leader. In this scenario, Your consumer will hang.
QUESTION
I wanted to hide menus conditionally based on userAccess
. My problem is if has many roles.
How will I be able to do it?
Pls check my code below
MENU
...ANSWER
Answered 2021-Jun-03 at 10:28Try to re-write checkAccess function as follows and make sure your roles are always in an array either it contains single value or multiple values
QUESTION
we have 3 Kafka machines with version - 0.1
we seen that some of the topics as - bio_test_covid9_verification are not balanced and ISR are not sync as the following
...ANSWER
Answered 2021-Jun-02 at 13:05"Sync issues" like down replicas are not a symptom of bad broker configs, rather it indicates that you have other network or hardware failures that cause the brokers to become unhealthy
You should definitely maintain min.insync.replicas=2
to ensure that losing one broker doesn't lose data. Setting to 3 along with an equal replication factor isn't really best practice
This is stated as such in Cloudera documentation.
QUESTION
we have a computing project and in the final stages I have to make a ordered leader board (top5). however this is more confusing than i thought. I've got this far so far but it isn't ordered nor the top 5.
...ANSWER
Answered 2021-Jun-02 at 11:04For what I can understand you want to sort the scores that you read from the file "H_Highscore.txt" and print them to the console in order from the highest to the smallest. There are some important points if you want to do that in a more robust ways:
-Add tests on the input data to make sure the user has entered a valid name/score pair, or else you wont be able to sort it afterwards (you will get an error).
-If you want to stick to you own way of doing things and not the solution I will provide you should use "with open('H_Highscore.txt', 'r') as f" instead of "f = open('H_Highscore.txt', 'r')" because the with statement will ensure that the file is closed in case of an errorr (read more about it here).
-I changed up your code to work in the way I understood it should work but you should really take a good look at the way you are writing to the file and the whole way your CLI works, so that the user can interact with it without having to run the code over and over again, maybe add a while loop with a break variable.
QUESTION
I have 3 consul servers in cluster. They were recovered from outage. Now they are running. Everything works. I checked with API who is leader, and I found it out. But weird thing - I don't see LEADER badge in UI. Morover I see "No service checks" on each server. I tried to restart each server, but it didn't help. How to fix it?
...ANSWER
Answered 2021-Jun-01 at 21:00The leader badge is shown under the Nodes view in the UI, not the Services view.
Aside from the built-in Serf health check, the Consul servers do not have any additional service checks associated with them.
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