Category Archives: Troubleshooting

Various problems solutions

AWS: CDK and Python – building an EKS cluster, and general impressions of CDK
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22 July 2023

So, Terraform is great, but so far in our project, we have decided to create the first AWS EKS clusters using the AWS CDK, because firstly, it is already on the project, and secondly, it is very interesting to try a new tool. Today we will see what came out of it, and how a… Read More »

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GitLab: gitlab-shell timeouts, and /metrics Connection refused
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25 April 2023

After running our self-hosted GitLab in production, we faced a bug: during git clone/pull/push operations, the request sometimes hung for 1-2 minutes. It looked like some kind of “floating” bug, that is, it could normally work 5 times, and then hangs once. The issues gitlab-shell timeouts For example, one time git clone works well: [simterm]… Read More »

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Kubernetes: Minikube, and a LoadBalancer in the Pending status
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5 October 2022

After running Pritunl in Minikube, it is not possible to connect to the VPN: … 2022-10-03 13:50:32 TCP/UDP: Preserving recently used remote address: [AF_INET]194.168.3.100:1194 2022-10-03 13:50:32 UDP link local: (not bound) 2022-10-03 13:50:32 UDP link remote: [AF_INET]194.168.3.100:1194 … Check its Kubernetes Service: [simterm] $ kubectl -n pritunl-local get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE… Read More »

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Arch Linux: pacman – error “HTTP server doesn’t seem to support byte ranges”
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30 May 2022

During system upgrade with pacman -Syu, I got internet disruption, and on the next upgrade I got the error from pacman. It sounds like “HTTP server doesn’t seem to support byte ranges. Cannot resume“: [simterm] … ==> Retrieving sources… -> Downloading clightd-5.6.tar.gz… ** Resuming transfer from byte position 12288 % Total % Received % Xferd… Read More »

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SSH: the “Too many authentication failures” error and its solution
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19 March 2022

During an SSH connection, I started getting the “Too many authentication failures” error message from a remote host. The error, and its cause Actually, the root cause is simple: during establishing a new SSH connection, the local ssh-client first tries to use keys, that are loaded by the local ssh-agent, and only after that will… Read More »

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Kubernetes: Helm – “x509: certificate signed by unknown authority”, and ServiceAccount for Pod
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29 September 2021

We have Github runners in our AWS Elastic Kubernetes service cluster, that are used to build Docker images and deploy them with Helm or ArgoCD. On the first helm install run in a Github runner’s Pod, we are getting the “x509: certificate signed by unknown authority” error: [simterm] # helm –kube-apiserver=https://kubernetes.default.svc.cluster.local list Error: Kubernetes cluster unreachable:… Read More »

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AWS: Cost Explorer – costs checking on the CloudWatch Logs example
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7 September 2021

This post isn’t an overview of the AWS Cost Explorer service, but just a quick example of how to detect costs for your AWS account and its services. So, when I came back from the vacation, I noticed that we’ve paid more than usually for the AWS CloudWatch for August – almost 50 dollars per… Read More »

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Tableau: install Tableau Bridge to access a database server in a private network
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9 August 2021

To access a database server, that has no public access (as it must be – access only inside an AWS VPC), Tableau suggests using its tool called Tableau Bridge. The idea is to have a Bridge service running in a network, which has access to a database server via its Private IP. Also, Bridge will… Read More »

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Let’s Encrypt: SSL and the “SERVFAIL looking up CAA for domain.com” error
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29 July 2021

One of mine website stopped working with the “Connection reset.” error. NGINX configs seem to be correct, and other sites on the same server are working. NGINX also gave nothing, no errors, PHP-FPM also are good. Let’s check the website with the curl: [simterm] $ curl -Iv https://example.setevoy.org.ua/ * Trying 139.59.205.180:443… * Connected to example.setevoy.org.ua… Read More »

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AWS: Simple Email Service Bounce rate and monitoring with and Prometheus
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14 July 2021

Recently, AWS blocked our AWS Simple Email Service because of its low bounce rate. This can be checked in the AWS SES > Reputation Dashboard, our account currently has Under review status: After we’ve connected AWS Tech Support, they enabled it back, but we must solve the issue asap, and have to monitor AWS SES… Read More »

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