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Questions tagged [healthcheck]

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Can you get the grep command to EXIT 1 if query successful?

I'm trying to formulate a docker healthcheck that restarts the container if the word FATAL in found in a certain log file. Something similar to this except with grep. test: ["CMD-SHELL", &...
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1 vote
1 answer
48 views

AWS NLB HTTPs health check using mTLS

Is it possible to do a AWS NLB HTTPs health check using mTLS? I tried setting up a TLS listener, loaded my cert, setup a TLS target group with HTTPs health check, but the health checks are still ...
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Keepalived: Transitioning to backup node not happening when check script on master server finds service is down for an applicaiton

I am trying to configure keepalived in such a way that if any application or service running on master node fails, keepalived should consider it as fault and backup node should act as master and take ...
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1 vote
1 answer
115 views

ECS restarts due to health_check failure when multiple other requests are slow to return

We noticed that our ECS Fargate backend services restart due to a health check response timeout: (service our-site-com-stack-BackendApiServiceStack...) (port 8000) is unhealthy in (target-group arn:...
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  • 111
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2 answers
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docker health check for disk space not working as intended

I've got an nginx container which ends up with a full disk after it's been running for about 10 days. So if a new version of the app isn't released, errors start to occur that look like; 2022/01/15 22:...
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How to health check a distributed NAT gateway?

I am using Google Cloud Platform and have manually setup a NAT gateway to peer two networks A and B so that workloads in network A have a default gateway which routes packets into network B. The ...
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1 vote
1 answer
496 views

Health Tests on NVMe

On the servers I have, with HDD or SSD, I have a cron that periodically runs: /usr/sbin/smartctl --test=short/long /dev/sd1 (for each disk) While it runs, it just looks at the output of /usr/sbin/...
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1 answer
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Is there any monitoring tools to create scenarios/dependencies check? [closed]

My team and I got the project to test a new monitoring solution that allow us to : Perform classical monitoring checks (through SNMP, ping, sensor status, vendor librairies etc...) Perform checks in ...
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2 answers
129 views

Google cloud loadbalancer health checks cause a load on servers

I have configured a load balancer https on google cloud with a health check having following parameters: healthcheck : Interval : 30 seconds Timeout : 15 seconds Healthy threshold: 1 success ...
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  • 101
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1 answer
76 views

Using SSH in check of Consul

I have a server with a dockerized Consul Agent (CA). In this CA, I want to run a script from the host who checks how many disk space left in a service check. For this, I created a service in the CA : {...
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  • 111
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1 answer
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Ceph Cluster - Reduced data availability: 96 pgs inactive And All OSD Nodes Are Down

I set up my Ceph Cluster by following this document. I have one Manager Node, one Monitor Node, and three OSD Nodes. The problem is that right after I finished setting up the cluster, the ceph health ...
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2 answers
193 views

How to stop requests on PHP server while it is running cron job sheduled PHP script?

I have a situation when some DDOS attacks are putting my PHP server down. Occasionally. I'm using AWS with auto scaling groups, so it is not a problem. The problems start when this server is going ...
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-2 votes
1 answer
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Is there an online service for checking the health of online services? [closed]

I have a web service in Amazon WS on port 443. Is there an online service that can monitor my service and email me if, for example, https://myservice.org returns an error?
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Implementing Health Check for Websites Hosted Behind a Shared LB

we host 4 web servers behind a shared load balancer. We don't have control over this Citrix NetScaler load balancer. We submit tickets to make changes as needed. Recently, one of the web servers ...
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35 views

Check health of my system such as database connections, mainframe connections, messaging services etc

I am so new to this topic that I am not even sure I am asking it correctly but I will give my best. We have number of applications talking to databases such as Oracle and Mainframe and uses messaging ...
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  • 101
1 vote
1 answer
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AWS autoscaling and ELB, use different health checking mechanism

I need some advice about AWS autoscaling, loadbalancers and health checks: is it possible to distinguish two health checking mechanism, one is when to send or do not send traffic to an instance (but ...
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  • 113
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1 answer
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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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1 vote
1 answer
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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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  • 179
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1 answer
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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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  • 19
1 vote
1 answer
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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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1 answer
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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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0 votes
1 answer
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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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  • 245
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1 answer
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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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0 votes
1 answer
472 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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1 vote
1 answer
1k 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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-1 votes
1 answer
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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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0 votes
1 answer
7k 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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1 vote
2 answers
486 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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1 vote
1 answer
532 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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  • 111
5 votes
2 answers
3k 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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  • 367
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1 answer
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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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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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0 votes
1 answer
3k 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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  • 2,003
2 votes
0 answers
157 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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3 votes
1 answer
8k 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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  • 997
0 votes
1 answer
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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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  • 113
2 votes
2 answers
204 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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0 answers
401 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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3 votes
2 answers
8k 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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  • 153
2 votes
1 answer
880 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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1 vote
0 answers
488 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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1 vote
1 answer
247 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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1 vote
1 answer
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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0 votes
1 answer
492 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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0 votes
1 answer
491 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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1 vote
1 answer
296 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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0 votes
1 answer
212 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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  • 103
7 votes
1 answer
10k 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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  • 1,434
0 votes
1 answer
6k 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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7 votes
1 answer
6k views

AWS: Target.FailedHealthChecks - Site always in "severe" state

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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