Questions tagged [healthcheck]
The healthcheck tag has no usage guidance.
109
questions
11
votes
3
answers
15k
views
How to set up ELB health checks with multiple applications running on each EC2 instance?
At AWS we'd like to to use ELBs to load balance EC2 instances which host multiple applications. Ideally we'd like to have a health check for application.
However, AWS Elastic Load Balancers currently ...
11
votes
2
answers
7k
views
Where are the Google Health check logs
I am running a GCE instance and on it I have a Kubernetes cluster running. An HTTP Load Balancer is also configured to probe the health of the a Kubernetes service running on this instance. But I ...
google-cloud-platform
9
votes
2
answers
20k
views
How should I configure my ELB health check when using NameVirtualHosts and redirecting to www?
My ELB keeps taking my instances out of service, because the HTTP health check is failing.
We have a DNS wildcard, and redirect everything to www:
vhost.conf:
ServerName www.example.com
ServerAlias ...
- 4,013
9
votes
3
answers
12k
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 ...
- 2,283
7
votes
1
answer
11k
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 ...
- 1,630
7
votes
1
answer
11k
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 ...
- 257
6
votes
6
answers
13k
views
How Amazon ELB Health check Works?
I am having problems configuring ELB for my servers.
I start 2 micro instances with the exact same conf and try to do Load Balancing. However they never pass the health check (HTTP port 80 path:"/").
...
- 165
5
votes
2
answers
4k
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 ...
- 387
5
votes
2
answers
4k
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/...
- 653
5
votes
1
answer
3k
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 ...
- 59
4
votes
2
answers
13k
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 ...
4
votes
1
answer
2k
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 ...
- 41
3
votes
3
answers
5k
views
What to check during a periodic system health check
I have been tasked with preparing a list of checks to do as a part of a weekly system health check routine which my team is supposed to do. The problem is neither I nor any of my colleagues have ever ...
- 133
3
votes
2
answers
329
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 ...
3
votes
1
answer
3k
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.
- 165
3
votes
1
answer
4k
views
HAProxy health check for a single backend
I have a HAProxy configuration with a single backend something very similar to this:
backend mybackend
option httpchk get /ping
http-check expect ! rstatus ^5
server mybackend-0 192.168.1.1:9041 ...
- 33
3
votes
1
answer
11k
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 ...
- 141
3
votes
1
answer
11k
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" ...
- 1,145
3
votes
1
answer
5k
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 ...
3
votes
2
answers
4k
views
Varnish configure a backend to have multiple probes?
Is it possible in Varnish 3 to configure a backend to have multiple probes?
I have multiple varnish servers and multiple backend servers running Drupal. I've configured a basic 1 second interval ...
- 506
3
votes
2
answers
1k
views
MySQL Slave Health Check
I am working on a project like creating database config on fly , got an array of read replicas for mysql instance and keeping one open connection to each and keeping their statics in that service so ...
- 93
3
votes
1
answer
1k
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 ...
3
votes
1
answer
3k
views
How to health check hosts over HTTPS behind the load-balancer?
I have NGINX serving my site over HTTPS on EC2 hosts behind Elastic Load Balancer. I need to set up a proper health-check in ELB. However, I cannot use https://www.example.com because I need to health-...
- 183
2
votes
2
answers
4k
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 ...
2
votes
1
answer
2k
views
How to perform healthcheck on NFS clients connectivity from the NFS-Server?
I have three Debian 11 servers let's call them nfs-server which is the NFS server, nfs1, and nfs2 which are the NFS clients.
I want to perform some sort of health check from the NFS server to ensure ...
- 95
2
votes
1
answer
5k
views
Haproxy http response timeout check
We use haproxy as http load balancer. Sometimes one of our servers stop responding while accepting http connection requests. So stats page displays servers as green "accessible" but our nagios server ...
- 21
2
votes
3
answers
3k
views
How to make HAProxy wait for successful health check before bringing server out of maintenance mode
I am using HAProxy socket communication to put my backend into maintenance mode before bringing the web server down for maintenance via this command:
echo "disable server cluster-01/app-01-4" | sudo ...
- 123
2
votes
0
answers
332
views
Safest way to configure `max_fails` in Nginx reverse proxy
We have nginx as a reverse proxy, load balancing across 2 application servers. These application servers were defined in upstream blocks like so:
upstream app_backends {
server 1.1.1.1:...
- 229
2
votes
0
answers
1k
views
Instance refresh: "insufficient data to evaluate its health with Amazon EC2"
The instance refreshes for my autoscaling group are taking a very long time due to instances having "insufficient data to evaluate its health with Amazon EC2."
However, the instances are ...
- 399
2
votes
2
answers
2k
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 ...
- 143
2
votes
0
answers
252
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 (...
- 121
2
votes
1
answer
1k
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 ...
2
votes
0
answers
2k
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 ...
- 268
2
votes
2
answers
3k
views
How to monitor and measure the health of Compact Flash cards used as server storage?
Context
The company sells access to a sort of cash register web application. Access to the application is given through a VPN. The VPN entrypoint for the clients is a Soekris board running Voyage ...
- 7,324
1
vote
1
answer
229
views
A practical way to do healthcheck for a new server?
I am currently trying to do healthcheck for a new server in data center as a first QA before using by any application side.
"What is the practical way and tools to check that the server is fine to ...
- 201
1
vote
1
answer
2k
views
what are the best ways to check on the health of a debian based server [closed]
Hello I been thinking about how to do a regular check on a system to assess the state of health of the systems. I am really turning into a system admin gradually and I already manage about 10 ubuntu ...
- 609
1
vote
2
answers
744
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-...
- 149
1
vote
1
answer
5k
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 ...
- 2,173
1
vote
1
answer
2k
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 ...
1
vote
1
answer
3k
views
AWS ELB health check when using nginx and TCP
I have an elasticbeanstalk environment that uses nginx as a frontend server for a node.js application.
The environment uses an elastic load balancer configured to accept connections on TCP:80/SSL:...
- 141
1
vote
1
answer
13k
views
EC2 Failing Load Balancer Health Check
One of my projects is an internal web app which we are putting behind a load balancer. As of now there is only one ec2 (will be more in production) and the load balancer is not able to reach the ec2-...
- 153
1
vote
3
answers
12k
views
Is there any CPU health testing software?
Is there any software that would test the reliability of a CPU? Like, check how all the instructions are working, verify that cache is not damaged, check for known CPU bugs, etc.
I've got a machine ...
- 863
1
vote
4
answers
355
views
Monitoring a one-off service
We do not have any sort of proper server monitoring solution in place (a situation I'd like to rectify this summer), but I've got one service in particular that I'd like to monitor. [Our current ...
- 3,540
1
vote
1
answer
6k
views
HAProxy check does not check content on IIS
I am new to HAproxy and I have read the docs googled every possible phrase I could think of but I cannot get haproxy to read the content my test page returns.
Here's the setup:
Single arm config -
...
- 11
1
vote
1
answer
65
views
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 ...
- 113
1
vote
1
answer
1k
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 ...
1
vote
1
answer
274
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 ...
1
vote
1
answer
326
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 ...
- 1,661
1
vote
1
answer
1k
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 ...
- 111
1
vote
1
answer
400
views
ELB Health check passes. Scaling Group Shows unhealthy. With scaling group set to the ELB check
Having an issue where our ELB health checks are showing up as healthy on the ELB page. but checking on the Scaling group instances page its showing as unhealthy.
causing the autoscaler to kill it ...
- 111
Related Tags
load-balancing × 30
amazon-web-services × 25
haproxy × 12
amazon-ec2 × 8
monitoring × 8
amazon-elb × 8
nginx × 7
kubernetes × 7
autoscaling × 6
docker × 4
aws-fargate × 4
linux × 3
windows × 3
apache-2.4 × 3
varnish × 3
apache-2.2 × 2
ssl × 2
iis × 2
firewall × 2
configuration × 2
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