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Questions tagged [healthcheck]

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34 views

Proxy HTTPS requests internally to the internet

Due to security reasons, one of our hosts HOST-B doesn't have a connection to the internet. But I need to set up HTTPS traffic to healthchecks.io to monitor cron jobs. All incoming traffic is proxied ...
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1answer
60 views

GCP HTTPS LB health check is working but no real traffic getting in, what could explain this?

If the health check is working and the backend service is marked as green (i.e. I do have a firewall rule for the LB hc/traffic), would could explain that no real traffic can get in (I'm getting a 502 ...
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1answer
18 views

Creating memory check via nagios core

How to check memory and incoming/outgoing connections of host. I have created memory usage i am getting error as below. Name of service:Memory Usage Status:UNKNOWN Last Check:03-13-2020 04:05:45 ...
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1answer
32 views

Managed instance group autohealing without external IP

I can not seem to find any information on this topic, auto-healing health checks is performed by instances in a google external IP range of 130.211.0.0/22, 35.191.0.0/16. I'm using a Cloud NAT setup ...
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1answer
100 views

How do I exclude health checks from Google Cloud Stackdriver traces

I'm running my app in Google Kubernetes Engine, and the Stackdriver Traces are very useful to determine the health and speed of my app. However the large majority of request coming into my app are ...
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14 views

apache2: hcmethod based on a post query

I'd like to use the hcmethod feature of apache2 to only redirect calls to synchronised nodes in the cluster. The thing is, the node only answers to POST query, not GET. Documentation does not list ...
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1answer
31 views

App Engine health check not working

This is my app.yaml runtime: go112 instance_class: B1 manual_scaling: instances: 1 liveness_check: path: "/health" check_interval_sec: 5 timeout_sec: 1 failure_threshold: 1 ...
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1answer
29 views

How to get loadbalancer reach instance's local service at 8080, AWS

A very green networking person here; working in the AWS environment, and have the following: EC2 instance up and running; I AWS Classic loadbalancer (I guess ELB) up and running; LB LB includes I LB ...
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1answer
117 views

Does Readiness check keep running after a pod has been marked unready?

My understanding is that after waiting for 45 seconds, Kubernetes is going to hit /heartbeat and wait for the response for 5 seconds. If it doesn't get the response, it is going to try 5 times(every ...
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1answer
417 views

How to configure an AWS ECS health check for a non web app container

I understand that usually for web app containers there needs to be an HTTP endpoint which responds with 200 for a succesful healthcheck. However, in my case I would have a non web app (a python ...
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1answer
34 views

Is there a way to setup ping check for remote host in Azure? [closed]

I'm trying to find a way in Azure to setup some service to be able to do ping check on remote host not hosted in Azure and alert when it is not reachable. For example On-Premises server with PIP.
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1answer
2k views

AWS Elastic Load Balancer and target group health check fail for no apparent reason

I have completed my AWS ELB architecture for our website and successfully created the Launch Configuration and Target Groups for which instances are created behind the Load Balancer. My configuration ...
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2answers
241 views

How to avoid duplicate health-check for the real same server in Haproxy?

Following config file work as expect but do duplicate health-check for the real same proxy-server, how can I avoid such duplicate health-check? (I still want do health-check but not duplicate health-...
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1answer
332 views

HTTP Health Check For Elastic Beanstalk App Triggers Scale / Capacity rules

I have an Elastic Beanstalk application that is running a wordpress application, and I would like some monitoring and scaling triggers for when the health check, the homepage, returns an HTTP response ...
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2answers
1k views

Verify internal NTP server is sending the correct time?

I have two NTP stratum 3 servers running and wanted to create a simple check that I could tell if either of the servers time drifted and alert that it's not synced properly with the public stratum 2 ...
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1answer
128 views

Veeam target | How to detect CRC errors in time?

A custumer uses Veeam and a NAS as primary backup target. The backups for last days were performed without any errors. Now they cannot restore due to CRC errors. Obviously, the writing to the NAS ...
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85 views

How are load balancers, health checks, and autoscalers supposed to handle surges?

I have a service which looks like: Internet -> Load Balancer -> Instances What seems to be happening in my service is the following scenario: A large surge of user traffic comes in, more than the ...
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1answer
1k views

What happens when a pod fails for readiness health check?

I was tracking down an unknown timeout problem in our cluster and found something interesting. We currently have 30 pods for a service. When I run kubectl get event Those 30 pods have been failing ...
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0answers
126 views

Elastic Beanstalk environment and security group config for ELB health checker?

I have an Elastic Beanstalk environment that I can't get Health Checks to work on. Here's my Elastic Beanstalk's Load Balancer configuration: My healthcheck URL is /status/ My EC2 security group (...
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1answer
3k views

Apache load balancer: health check with long timeout

I'm using Apache HTTP Server as a reverse proxy for a couple of Tomcat instances. I've setup load balancing as follows: <Proxy "balancer://tomcat-app"> BalancerMember "http://10.0.0.1:8080" ...
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1answer
73 views

AWS health check and respawn if issue

I have some instances in AWS which I need only one of them, no scaling. Of course we monitor those instances as well, but before alerting someone. I checked if there's a way in AWS to check for the ...
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2answers
138 views

DNS layer with service discover as resolver not SRV

I need to know is there any solution for solving my problem. I have a BIND DNS server and consul as service discoverer. This is what i want as simple diagram: How can I configure this sample setup ...
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224 views

Kubernetes Influx DB - Backend Unhealthy

I am trying to deploy Influx DB on Kubernetes. Using the official Influx DB Helm chart. I am deploying this Helm chart with the following values file: persistence: enabled: true size: 5Gi ...
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2answers
3k views

Configuring correct firewall settings for GCP HTTP load balancer

I have two VMs running HTTP servers on port 8545 as shown in the figure and placed in an instance group. I created a HTTP load balancer in GCP to balance HTTP requests from end users. However, with ...
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1answer
589 views

Determine load balancer health check timeout

How do you determine reasonable health check timeouts for load balancers? My application is failing load balancer health checks. I'm using the default health check timeout of 5 seconds, but I've ...
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0answers
253 views

proxy_hcheck_module does not work using TCP method

I am using a Windows build (and it has to be Windows) of Apache 2.4.33 from https://www.apachelounge.com I have configured it as a load balancer, and everything seems to work fine until I try adding ...
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1answer
131 views

How to access apps that have been deployed in k8s on Google Cloud Platform using a Google Cloud Engine HTTP(S) Load Balancer?

Aim: to access apps that reside in a kubernetes (k8s) namespace using an HTTP(S) Load Balancer (HLB) Methods TCP load balancing (TLB) (layer 4) A k8s cluster has been created on Google Cloud ...
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1answer
1k views

Using a GCP Global Load Balancer HTTP health check, is it possible to POST instead of GET?

We have configured GLB in GCP in front of a Netcool Ominibus Probe server. This is an API that accepts POST events only. When the health check on the GLB tries to connect to the probe server on port ...
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1answer
337 views

503 ALB health check HAProxy

I have a HAProxy behind Amazon ALB (Application Load Balancer) http/80 health check is ok, but https/443 gives me 503, even though the site is available & ok Here's what I see in HAProxy log: 4/...
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1answer
254 views

GCP Load Balancer very high health check frequency

I'm using an HTTP Load Balancer on GCP, configured via Kubernetes Ingress. It seems like the number of health check requests is very frequent: 10.0.4.1 - - [24/Apr/2018:17:53:25 +0000] "GET / HTTP/1....
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1answer
234 views

Best practice for auto-healing servers in the cloud (outside of AWS)?

We are in the process of moving from AWS where we have a highly available system setup using EC2's auto scaling feature. However, we aren't using this to change the size of the pool based on resource ...
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1answer
63 views

Should things like database performance be included in a healthcheck

I manage a webservice and it is very important for my company to detect and notify if any of the services is down, and also if any of the operations it does is taking too long to respond. Until now ...
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1answer
6k views

What is HEALTHCHECK really used for when running Docker in swarm mode?

I'm having a hard time figuring out what HEALTHCHECK really is used for when running Docker in swarm mode. One place suggests that Docker will restart a task which is considered unhealthy. Another ...
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1answer
4k views

Haproxy external check with arguments

I'm trying to use the Option external-check and can't get it to work with an argument. It if I can't pass anything then that option becomes useless. I've been trying for hours and nothing works. It ...
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1answer
3k views

AWS: Target.FailedHealthChecks… Site is working fine

My Elastic Beanstalk application is in a constant severe state... even though it's working absolutely fine. Looking at the Health screen it says that 100% of its requests are 3xx, and looking at the ...
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0answers
804 views

Is RST, ACK expected in a TCP Health Check

I've been experiencing some issues with two servers that I have with my VPS hosting provider where I've been getting intermittent connection errors. I've done LAN traces from the server and I ...
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1answer
841 views

Disable AWS ELB health check

Is there a way to disable AWS ELB's health check completely? I use a logger middleware (morgan) to log all requests and it's quite annoying for health check requests to get logged every 5min.
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1answer
5k views

HAproxy: Run script on health check change

I have set up a haproxy configuration with a backend with two servers looking like that: ... default option log-health-checks ... mailers mta mailer smtp1 127.0.0.1:25 ... backend ...
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68 views

Check age of oldest file in directory … But no other access

There are roughly 30 users and 30 directories with this structure: /home/user1/input/ /home/user2/input/ /home/user3/input/ /home/user4/input/ ... A check should monitor the directories. If the ...
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1answer
2k views

Broken GKE Backend Health Check Default

I have read this and I understand (I think) the differences between Kubernetes livenessProbes, and the GKE LoadBalancer health checks. My problem is this: I am exposing most of my Kube services via ...
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1answer
315 views

etcd on GCE-load balancing and health checks

I'm trying to set up a secure etcd cluster on CoreOS on top of GCE. I want to distribute load between several etcd nodes with some kind of load balancing. I want a load balancer that would have an ...
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797 views

Why is Varnish not probing the backend server?

I have two backends for a Varnish configuration. The first backend works fine, the second backend seems to be completely ignored by Varnish. It seems that the .probe on the second backend is ignored ...
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2answers
56 views

Expose Windows system health over HTTP, machine-readable? [closed]

Are there any off-the-shelf tools that will expose the basic health of a Windows machine (network accessibility, system load, etc.) over HTTP in a machine-readable form that I can access from another ...
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0answers
263 views

HAProxy health check consecutive counts not resetting

We have two Redis servers behind an HAProxy server. One server is the master, which is up, and the other is the slave, which is down. If the master goes down, the sentinels elect the other server to ...
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1answer
1k views

AWS Elastic Beanstalk Health Check on Alternate Port using Application Elastic Load Balancer

I'm trying to automate the configuration of my Elastic Beanstalk application using Saved Configs. Does anyone have an example of how to get the application load balancer created from Elastic ...
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1answer
329 views

Google cloud autoscaling kills instances which do job

I'm trying to setup GCP autoscaling for my application (video converting service) and I'm experiencing the following problem: Let's say the autoscaler creates 3 new instances and in the each ...
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1answer
883 views

Restarting Google Compute Engine instances if unhealthy

Health checks can probe my instance on specific http requests and determine if it is unhealthy. From the documentation I undertsand that autohealing only works for managed instance group, which means ...
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1answer
652 views

Setting up health check for EC2 instances with DataDog

I have an existing AWS infrastructure which is integrated with DataDog, which is responsible for monitoring various metrics, e.g. SQS queues, ELB, etc. I'd like to set up a health check for some web ...
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1answer
166 views

(NGINX LB + docker-compose) Stop 1 service and now only use the other one

I'm using NGINX inside docker-compose with 2 node services. The load balancing is working. Not sure if this is how it should be, but my page load goes to ping1, then the CSS file loads from service ...
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1answer
3k views

How to respond to http health check at a particular url while redirecting other traffics?

Background: I am trying to set up an instance group in Google cloud platform. The instance group consists a number of nginx instances whose job is simply to redirect incoming https traffic to an ...

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